UPC_思念

S2SH+DWR实现的增删改查实例

一、介绍

主要技术:

(1)s2sh之间的整合

(2)dwr和s2sh整合(验证姓名是否相同)

(3)强大的jquery validator验证框架验证表单

(4)分页bean的编写

(5)过滤器，拦截器的编写

(6)泛型dao的编写

二、实例

1、数据库脚本

本例是采用mysql数据库，脚本如下:

CREATE DATABASE /*!32312 IF NOT EXISTS*/`practice` /*!40100 DEFAULT CHARACTER SET gbk */; USE `practice`; DROP TABLE IF EXISTS `student`; CREATE TABLE `student` ( `id` int(11) NOT NULL AUTO_INCREMENT, `name` varchar(50) DEFAULT NULL, `age` int(11) DEFAULT NULL, `sex` varchar(1) DEFAULT NULL, `address` varchar(100) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=31 DEFAULT CHARSET=gbk; insert into `student`(`id`,`name`,`age`,`sex`,`address`) values (2,'张民生',24,'男','江苏淮安市'),(26,'李军',41,'男','江苏南京'),(27,'李丽丽',25,'女','浙江杭州'),(28,'周塔利',36,'男','黑龙江'),(29,'李丽',24,'女','湖北'),(30,'凯萨',21,'女','新疆乌鲁木齐'); DROP TABLE IF EXISTS `users`; CREATE TABLE `users` ( `id` int(11) NOT NULL AUTO_INCREMENT, `username` varchar(50) DEFAULT NULL, `password` varchar(50) DEFAULT NULL, PRIMARY KEY (`id`) ) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=gbk; insert into `users`(`id`,`username`,`password`) values (1,'admin','123456');

2、表现层

(1)login.jsp(登录页面)

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <%@taglib prefix="s" uri="/struts-tags"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> // --> // --> // -->

(2)logout.jsp(退出页面)

<%@ page language="java" pageEncoding="ISO-8859-1"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> My JSP 'logout.jsp' starting page <% response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setHeader("Cache-Control", "no-store"); response.setDateHeader("Expires",0); if(session!=null) session.invalidate(); %>

(3)exception(错误异常显示页面)

<%@ page contentType="text/html; charset=gbk"%> <%@taglib prefix="s" uri="/struts-tags"%> <s:text name="exception_title"/>

<s:property value="exception.message"/>   
  </div> 
  <div>
    (4)studentList.jsp(学生列表页面) 
  </div> 
  <div>
    <%@ page language="java" import="java.util.*" pageEncoding="gbk" isELIgnored="false"%> <%@ taglib prefix="s" uri="/struts-tags"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>学生信息管理列表</title> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:style type="text/css"> a：link {color：green;text-decoration：none } a：visited {color：red;text-decoration：none } a：hover {color：blue;text-decoration：overline;font-size：20pt } --></mce:style><style type="text/css" mce_bogus="1">body { margin-left: 0px; margin-top: 0px; margin-right: 0px; margin-bottom: 0px; } .tabfont01 { font-family: "宋体"; font-size: 9px; color: #555555; text-decoration: none; text-align: center; } .font051 { font-family: "宋体"; font-size: 12px; color: #333333; text-decoration: none; line-height: 20px; } .font201 { font-family: "宋体"; font-size: 12px; color: #FF0000; text-decoration: none; } .button { font-family: "宋体"; font-size: 14px; height: 37px; } html { overflow-x: auto; overflow-y: auto; border: 0; } --> a：link {color：green;text-decoration：none } a：visited {color：red;text-decoration：none } a：hover {color：blue;text-decoration：overline;font-size：20pt }</style> </head> <body style="text-align: center" mce_style="text-align: center"> <form name="fom" id="fom" method="post" action="student_query.action"> <table width="98%" border="0" align="center" cellpadding="0" cellspacing="0"> <tr> <td colspan="2"> <span style="text-align: center" mce_style="text-align: center"> 当前用户： <s:property value="#session.user.username" />     登录时间: <mce:script type="text/javascript"></mce:script> </span> <span style="margin-right: 100px; float: right;" mce_style="margin-right: 100px; float: right;"><a class=style2 style="text-decoration: none;" href="<%=path%>/logout.jsp"><font color="red" size="3">退出</font> </a> </span> </td> </tr> <tr> <td width="880"> 查询方式： <select name="querytype"> <option <s:if test='querytype==1'>selected="selected"</s:if> value="1"> 学生姓名 </option> <option <s:if test='querytype==2'>selected="selected"</s:if> value="2"> 性别 </option> </select> <input name="condition" value="<s:property value='condition'/>" type="text" size="12" /> <input type="submit" class="right-button02" value="查 询" /> </td> <td width="20"> <input type="button" οnclick="javascript:window.location.href='<%=path%>/student_toAdd.action'" class="right-button02" value="添加"> </td> </tr> </table> <table width="100%" border="0" cellpadding="4" cellspacing="1" bgcolor="#464646" class="newfont03"> <thead> <tr class="CTitle"> <td height="22" colspan="10" align="center" style="font-size: 16px"> 学生信息管理列表 </td> </tr> </thead> <tbody> <tr bgcolor="#EEEEEE" align="center"> <td width="4%"> 编号 </td> <td width="15%" align="center" height="30"> 姓名 </td> <td width="10%" align="center" height="30"> 性别 </td> <td width="10%"> 年龄 </td> <td width="13%"> 地址 </td> <td> 操作 </td> </tr> <s:if test="(pageListData.dataList!=null)&&(!pageListData.dataList.isEmpty())"> <s:iterator value="#request.pageListData.dataList" id="u" status="st"> <tr id="changecolor" bgcolor="#FFFFFF" align="center"> <td> <s:property value="#st.index+1+(currentPage-1)*pageSize" /> </td> <td> <s:property value="#u.name" /> </td> <td> <s:property value="#u.sex" /> </td> <td> <s:property value="#u.age" /> </td> <td> <s:property value="#u.address" /> </td> <td> <a href="${pageContext.request.contextPath}/student_toUpdate.action?stu.id=${u.id}&¤tPage=${currentPage}">修改</a> <a href="${pageContext.request.contextPath}/student_delete.action?stu.id=${u.id}" οnclick="return confirm('删除后无法恢复,确定要删除吗')">删除</a> </td> </tr> </s:iterator> </s:if> </tbody> </table> <s:property value="#request.pageListData.footer" escape="false" /> </form> </body> </html>  
  </div> 
  <div>
    (5)studentEdit.jsp(学生信息修改页面) 
  </div> 
  <div>
    <%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <%@ taglib prefix="s" uri="/struts-tags"%> <% String path = request.getContextPath(); String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/"; %> <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <base href="<%=basePath%>"> <title>学生信息修改</title> <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/css/style.css" mce_href="${pageContext.request.contextPath}/css/style.css"> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type='text/javascript' src="<%=request.getContextPath()%></mce:script> <mce:script type='text/javascript' src="<%=request.getContextPath()%></mce:script> <mce:script type='text/javascript' src="<%=request.getContextPath()%></mce:script> </head> <body style="text-align:center" mce_style="text-align:center"> <form action="<%=request.getContextPath()%>/student_update.action" id="studentUpdateForm" method="post"> <input type="hidden" name="stu.id" value="<s:property value='stu.id'/>"/> <input type="hidden" name="currentPage" value="<s:property value='currentPage'/>"/> 学生信息修改 <p> <label class="required"> 姓名: </label> <input type="text" id="name" value="<s:property value='stu.name'/>" name="stu.name" /> <input type="hidden" value="<s:property value='stu.name'/>" id="stuname" /> <span id="namespan"></span> </p> <p> <label class="required"> 年龄: </label> <input type="text" id="chooseone" value="<s:property value='stu.age'/>" name="stu.age" /> <span id="agespan"></span> </p> <p> <label class="required"> 性别: </label> <input type="text" id="choosetwo" name="stu.sex" value="<s:property value='stu.sex'/>" /> <span id="sexspan"></span> </p> <p> <label class="required"> 地址: </label> <input type="text" id="choosethree" value="<s:property value='stu.address'/>" name="stu.address" /> <span id="addressspan"></span> </p> <center> <input type="submit" id="send" value="提交" /> <input type="button" value="返回" οnclick="javascript:window.location.href='<%=path%>/student_query.action?currentPage=<s:property value='currentPage'/>'"/> </center> </form> </body> </html>   
  </div> 
  <div>
    (6)studentAdd.jsp(学生信息添加页面) 
  </div> 
  <div>
    <%@ page language="java" import="java.util.*" pageEncoding="gbk"%> <%@ taglib prefix="s" uri="/struts-tags"%> <% String path = request.getContextPath(); String basePath = request.getScheme() + "://" + request.getServerName() + ":" + request.getServerPort() + path + "/"; %> <html> <head> <base href="<%=basePath%>"> <title>学生信息添加</title> <link rel="stylesheet" type="text/css" href="${pageContext.request.contextPath}/css/style.css" mce_href="${pageContext.request.contextPath}/css/style.css"> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type="text/javascript" src="<%=path%></mce:script> <mce:script type='text/javascript' src="<%=request.getContextPath()%></mce:script> <mce:script type='text/javascript' src="<%=request.getContextPath()%></mce:script> <mce:script type='text/javascript' src="<%=request.getContextPath()%></mce:script> </head> <body style="text-align: center" mce_style="text-align: center"> <form action="<%=request.getContextPath()%>/student_add.action" method="post" id="studentForm"> 学生信息添加 <p> <label for="name" class="required"> 姓名: </label> <input type="text" id="name" name="stu.name"/> <span id="namespan"></span> </p> <p> <label for="age" class="required"> 年龄: </label> <input type="text" id="age" name="stu.age" /> <span id="agespan"></span> </p> <p> <label for="sex" class="required"> 性别: </label> <input type="text" id="sex" name="stu.sex" /> <span id="sexspan"></span> </p> <p> <label for="address" class="required"> 地址: </label> <input type="text" id="address" name="stu.address" /> <span id="addressspan"></span> </p> <input type="submit" value="提 交" /> <input type="button" value="返回" οnclick="javascript:window.location.href='<%=path%>/student_query.action?currentPage=<s:property value='currentPage'/>'" /> </form> </body> </html>   
  </div> 
  <div>
    (7)js脚本 
  </div> 
  <div>
    student.js(采用jquery validator验证框架验证表单以及采用dwr框架验证姓名是否存在) 
  </div> 
  <div>
    $(document).ready(function() { // 字符验证 jQuery.validator.addMethod("stringCheck", function(value, element) { return this.optional(element) || /^[/u0391-/uFFE5/w]+$/.test(value); }, "只能包括中文字、英文字母、数字和下划线"); // 中文字两个字节 jQuery.validator.addMethod("byteRangeLength", function(value, element, param) { var length = value.length; for ( var i = 0; i < value.length; i++) { if (value.charCodeAt(i) > 127) { length++; } } return this.optional(element) || (length >= param[0] && length <= param[1]); }, "请确保输入的值在3-15个字节之间(一个中文字算2个字节)"); //结合dwr框架验证姓名是否存在 jQuery.validator.addMethod("checkName", function(value, element) { var flag = false; dwr.engine.setAsync(false); studentService.isExistName(value,"add",function(data) { flag = !data; }); dwr.engine.setAsync(true); return flag; }, "用户名已经存在，请重新输入!"); jQuery.validator.addMethod("checkNameForUpdate", function(value, element) { var flag = false; dwr.engine.setAsync(false); var temp=document.getElementById("stuname").value==value; studentService.isExistName(value+":"+temp,"update",function(data) { flag = !data; }); dwr.engine.setAsync(true); return flag; }, "用户名已经存在，请重新输入!"); // 验证年龄 1-149之间 jQuery.validator.addMethod("ageCheck", function(value, element) { return this.optional(element) || /^([1-9]{1}|[1-9]{1}[0-9]{1}|1[1-4]{1}[0-9]{1})$/ .test(value); }, "只能1-149之间的数字!"); // 验证性别 jQuery.validator.addMethod("sexCheck", function(value, element) { return this.optional(element) || /^[/u4E00-/u9FFF]{1}$/.test(value); }, "只能是一个汉字"); //// 身份证号码验证 //jQuery.validator.addMethod("isIdCardNo", function(value, element) { // return this.optional(element) || isIdCardNo(value); //}, "请正确输入您的身份证号码"); // //// 手机号码验证 //jQuery.validator.addMethod("isMobile", function(value, element) { // var length = value.length; // var mobile = /^(((13[0-9]{1})|(15[0-9]{1}))+/d{8})$/; // return this.optional(element) || (length == 11 && mobile.test(value)); //}, "请正确填写您的手机号码"); // //// 电话号码验证 //jQuery.validator.addMethod("isTel", function(value, element) { // var tel = /^/d{3,4}-?/d{7,9}$/; //电话号码格式010-12345678 // return this.optional(element) || (tel.test(value)); //}, "请正确填写您的电话号码"); // //// 联系电话(手机/电话皆可)验证 //jQuery.validator.addMethod("isPhone", function(value,element) { // var length = value.length; // var mobile = /^(((13[0-9]{1})|(15[0-9]{1}))+/d{8})$/; // var tel = /^/d{3,4}-?/d{7,9}$/; // return this.optional(element) || (tel.test(value) || mobile.test(value)); // //}, "请正确填写您的联系电话"); // //// 邮政编码验证 //jQuery.validator.addMethod("isZipCode", function(value, element) { // var tel = /^[0-9]{6}$/; // return this.optional(element) || (tel.test(value)); //}, "请正确填写您的邮政编码"); //开始验证 studentUpdateForm $("#studentForm").validate( { /**//* 设置验证规则 */ rules : { "stu.name" : { required : true, stringCheck : true, checkName : true, byteRangeLength : [ 3, 15 ] }, "stu.age" : { required : true, ageCheck : true }, "stu.sex" : { required : true, sexCheck : true }, "stu.address" : { required : true, stringCheck : true, byteRangeLength : [ 3, 100 ] } }, //设置错误信息 messages : { "stu.name" : { required : "请填写用户名", stringCheck : "用户名只能包括中文字、英文字母、数字和下划线", checkName : "该姓名已经存在", byteRangeLength : "用户名必须在3-15个字符之间(一个中文字算2个字符)" }, "stu.age" : { required : "请输入年龄", email : "请输入1-149之间的数字" }, "stu.sex" : { required : "请输入您的性别", isPhone : "请输入一个汉字" }, "stu.address" : { required : "请输入您的联系地址", stringCheck : "请正确输入您的联系地址", byteRangeLength : "请详实您的联系地址以便于我们联系您" } }, errorPlacement : function(error, element) { element.parent().find("span").html(error) }, success : function(label) { label.html(" ").addClass("ok"); } }); //开始验证 修改页面 $("#studentUpdateForm").validate( { /**//* 设置验证规则 */ rules : { "stu.name" : { required : true, stringCheck : true, checkNameForUpdate : true, byteRangeLength : [ 3, 15 ] }, "stu.age" : { required : true, ageCheck : true }, "stu.sex" : { required : true, sexCheck : true }, "stu.address" : { required : true, stringCheck : true, byteRangeLength : [ 3, 100 ] } }, //设置错误信息 messages : { "stu.name" : { required : "请填写用户名", stringCheck : "用户名只能包括中文字、英文字母、数字和下划线", checkNameForUpdate : "该姓名已经存在", byteRangeLength : "用户名必须在3-15个字符之间(一个中文字算2个字符)" }, "stu.age" : { required : "请输入年龄", email : "请输入1-149之间的数字" }, "stu.sex" : { required : "请输入您的性别", isPhone : "请输入一个汉字" }, "stu.address" : { required : "请输入您的联系地址", stringCheck : "请正确输入您的联系地址", byteRangeLength : "请详实您的联系地址以便于我们联系您" } }, errorPlacement : function(error, element) { element.parent().find("span").html(error) }, success : function(label) { label.html(" ").addClass("ok"); } }); });  
  </div> 
  <div>
    main.js 
  </div> 
  <div>
    //检查分页列表页面页码输入框 function checkCurrentPage(input, totalPages) { if (!input.match(/^/d*$/)) { alert("只能输入数字"); document.getElementById("jumpPageBox").value = document .getElementById("pages").value; document.getElementById("jumpPageBox").focus(); } else if (input > totalPages || parseInt(input) <= 0) { alert("对不起,你输入的页码有误!"); document.getElementById("jumpPageBox").value = document .getElementById("pages").value; document.getElementById("jumpPageBox").focus(); } } //去掉前后空格 function trim(s) { try { return s.replace(/(^/s*)|(/s*$)/g, ""); } catch (e) { return s; } } //给列表中id为changecolor的那些行变色 $(document).ready(function() { $("table tbody tr[id*='changecolor']").mouseover(function() { $(this).css("background", "orange"); }).mouseout(function() { $(this).css("background", "white"); }) });  
  </div> 
  <div>
    login.js(采用jquery validator验证框架验证登录表单) 
  </div> 
  <div>
    $(document).ready(function() { $("#loginForm").validate( { /**//* 设置验证规则 */ rules : { "user.username" : { required : true }, "user.password" : { required : true } }, //设置错误信息 messages : { "user.username" : { required : "请填写用户名" }, "user.password" : { required : "请填写密码" } }, errorPlacement : function(error, element) { element.parent().find("span").html(error) }, success : function(label) { label.html(" ").addClass("ok"); } }); });  
  </div> 
  <div>
    除此之外，还用到jquery及其验证框架的js库，请自行下载 
  </div> 
  <div>
    (8)CSS 
  </div> 
  <div>
    style.css 
  </div> 
  <div>
    label.required:after { content:"(*)"; color:red; font-family:"Lucida Grande",Verdana,Arial,Helvetica,sans-serif; } label.ok { background:url("../images/valid.gif") no-repeat; padding-left:16px; } label.error { color:#d00; text-transform:none; margin-left:6px; } label.choice { vertical-align:middle; font-weight:normal; text-transform:none; }  
  </div> 
  <div>
    3、数据访问层及其业务层 
  </div> 
  <div>
    (1)DAO层 
  </div> 
  <div>
     BaseDAO.java 
  </div> 
  <div>
    package com.anxin.dao; import java.util.List; import com.anxin.util.PageListData; public interface BaseDAO<T,PK> { public void save(T entity); public void delete(T entity); public void deleteById(Class<T> entityClass, PK id); public void saveOrUpdate(T entity); public List<T> findAll(Class<T> entityClass); public PageListData findList(Class<T> entityClass, String hql, Object[] params, int currentPage, int pageSize); public List<T> findByProperty(Class<T> entityClass, String propertyName, Object value,int type); public T findById(Class<T> entityClass, PK id); }   
  </div> 
  <div>
    BaseDAOImpl.java 
  </div> 
  <div>
    package com.anxin.dao.impl; import java.io.Serializable; import java.util.List; import org.hibernate.Query; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.orm.hibernate3.support.HibernateDaoSupport; import com.anxin.dao.BaseDAO; import com.anxin.util.PageListData; public class BaseDAOImpl<T, PK extends Serializable> extends HibernateDaoSupport implements BaseDAO<T, PK> { static Logger logger = LoggerFactory.getLogger(BaseDAOImpl.class); // 保存 public void save(T entity) { try { getHibernateTemplate().save(entity); } catch (RuntimeException re) { throw re; } } // 保存或者更新 public void saveOrUpdate(T entity) { try { getHibernateTemplate().merge(entity); } catch (RuntimeException re) { throw re; } } // 删除 public void delete(T entity) { try { getHibernateTemplate().delete(entity); } catch (RuntimeException re) { throw re; } } // 根据id删除某个对象 public void deleteById(Class<T> entityClass, PK id) { try { getHibernateTemplate().delete(findById(entityClass, id)); } catch (RuntimeException re) { throw re; } } // 根据id加载某个对象 public T findById(Class<T> entityClass, PK id) { try { return (T) getHibernateTemplate().get(entityClass, id); } catch (RuntimeException re) { logger.error("findById " + entityClass.getName() + " failed :{}", re); throw re; } } // 查找所有的对象 public List<T> findAll(Class<T> entityClass) { try { return getHibernateTemplate().loadAll(entityClass); } catch (RuntimeException re) { throw re; } } // 根据某个属性及其值精确或模糊查找对象 public List<T> findByProperty(Class<T> entityClass, String propertyName, Object value, int type) { String queryString = ""; try { if (type == 1) {// type=1是精确查找 queryString = "from " + entityClass.getName() + " as model where model." + propertyName + "= ?"; } else if (type == 2) {// type=2是模糊查找 queryString = "from " + entityClass.getName() + " as model where model." + propertyName + "like ?"; } return getHibernateTemplate().find(queryString, value); } catch (RuntimeException re) { throw re; } } // 根据hql语句及其查询参数，当前页数，每页显示的数目得到分页列表 public PageListData findList(Class<T> entityClass, String hql, Object[] params, int currentPage, int pageSize) { PageListData listdata=null; try { Query query = getSession().createQuery(getCountsHql(hql)); if (null != params && 0 != params.length) { for (int i = 0; i < params.length; i++) { query.setParameter(i, params[i]); } } else { logger.warn("参数为空"); } int total = ((Long) query.uniqueResult()).intValue(); logger.debug("总记录数:", total); query = getSession().createQuery(hql); if (null != params && 0 != params.length) { for (int i = 0; i < params.length; i++) { query.setParameter(i, params[i]); } } if (0 != pageSize) { query.setFirstResult( (currentPage == 0 ? 0 : currentPage - 1) * pageSize) .setMaxResults(pageSize); } List data = query.list(); listdata=new PageListData(total,pageSize,currentPage, data); } catch (RuntimeException re) { throw re; } return listdata; } private String getCountsHql(String hql) { int index = hql.indexOf("from"); if (index != -1) { return "select count(*) " + hql.substring(index); } throw new RuntimeException("sql语句异常" + hql); } }   
  </div> 
  <div>
    UserDAO.java 
  </div> 
  <div>
    package com.anxin.dao; import com.anxin.bean.User; public interface UserDAO extends BaseDAO<User,Integer>{ public User checkLogin(User user); }   
  </div> 
  <div>
    UserDAOImpl.java 
  </div> 
  <div>
    package com.anxin.dao.impl; import org.hibernate.Query; import com.anxin.bean.User; import com.anxin.dao.UserDAO; public class UserDAOImpl extends BaseDAOImpl<User,Integer> implements UserDAO{ public User checkLogin(User user){ String hql="from User u where u.username=? and u.password=?"; Query q=getSession().createQuery(hql); q.setString(0, user.getUsername()).setString(1, user.getPassword()); return q.list()!=null&&q.list().size()>0?(User)q.list().get(0):null; } }   
  </div> 
  <div>
    StudentDAO.java 
  </div> 
  <div>
    package com.anxin.dao; import com.anxin.bean.Student; public interface StudentDAO extends BaseDAO<Student,Integer>{ }   
  </div> 
  <div>
    StudentDAOImpl.java 
  </div> 
  <div>
    package com.anxin.dao.impl; import com.anxin.bean.Student; import com.anxin.dao.StudentDAO; public class StudentDAOImpl extends BaseDAOImpl<Student,Integer> implements StudentDAO{ }   
  </div> 
  <div>
    (2)service层 
  </div> 
  <div>
    StudentService.java 
  </div> 
  <div>
    package com.anxin.service; import java.util.List; import java.util.Map; import com.anxin.bean.Student; import com.anxin.bean.User; import com.anxin.util.PageListData; public interface StudentService{ public void save(Student stu); public void delete(Student stu); public void deleteById(Integer id); public void update(Student stu); public PageListData findList(Map param, int currentPage, int pageSize); public boolean isExistSameProperty(Map param); public Student findById(Integer id); public List<Student> findAll(); public List<Student> findByCondition(Map param,int type); }   
  </div> 
  <div>
    StudentServiceImpl.java 
  </div> 
  <div>
    package com.anxin.service.impl; import java.util.List; import java.util.Map; import com.anxin.bean.Student; import com.anxin.bean.User; import com.anxin.dao.StudentDAO; import com.anxin.dao.UserDAO; import com.anxin.service.StudentService; import com.anxin.service.UserService; import com.anxin.util.PageListData; public class StudentServiceImpl implements StudentService { private StudentDAO dao; public void save(Student stu) { dao.save(stu); } public void delete(Student stu) { dao.delete(stu); } public void deleteById(Integer id) { dao.deleteById(Student.class, id); } public void update(Student stu) { dao.saveOrUpdate(stu); } public PageListData findList(Map param, int pageNum, int pageSize) { String hql = "from Student where 1=1 "; for (Object o : param.keySet()) { hql += " and " + o.toString() + " ? "; } Object params[] = param.values().toArray(); return dao.findList(Student.class, hql, params, pageNum, pageSize); } public boolean isExistSameProperty(Map param) { return true; } public Student findById(Integer id) { return dao.findById(Student.class, id); } public List<Student> findAll() { return dao.findAll(Student.class); } public boolean isExistName(String name, String type) { boolean flag=false; if ("add".equals(type)) { List list = dao.findByProperty(Student.class, "name", name, 1); flag=(list != null && list.size() > 0 ? true : false); } else if ("update".equals(type)) { String temp[]=name.split(":"); List list = dao.findByProperty(Student.class, "name", temp[0], 1); if(Boolean.parseBoolean(temp[1])) flag=(list!=null&&list.size()>1?true:false); else flag=(list!=null&&list.size()>0?true:false); } return flag; } public List<Student> findByCondition(Map param, int type) { return dao.findByProperty(Student.class, null, null, type); } public StudentDAO getDao() { return dao; } public void setDao(StudentDAO dao) { this.dao = dao; } }   
  </div> 
  <div>
    UserService.java 
  </div> 
  <div>
    package com.anxin.service; import java.util.List; import java.util.Map; import com.anxin.bean.User; import com.anxin.util.PageListData; public interface UserService{ public void save(User user); public void delete(User user); public void deleteById(Integer id); public void update(User user); public PageListData findList(Map param, int currentPage, int pageSize); public boolean isExistSameProperty(Map param); public User findById(Integer id); public List<User> findAll(); public List<User> findByCondition(Map param,int type); public User checkLogin(User user); }   
  </div> 
  <div>
    UserServiceImpl.java 
  </div> 
  <div>
    package com.anxin.service.impl; import java.util.List; import java.util.Map; import com.anxin.bean.User; import com.anxin.dao.UserDAO; import com.anxin.service.UserService; import com.anxin.util.PageListData; public class UserServiceImpl implements UserService { private UserDAO dao; public void save(User user) { dao.save(user); } public void delete(User user) { dao.delete(user); } public void deleteById(Integer id) { dao.deleteById(User.class, id); } public void update(User user) { dao.saveOrUpdate(user); } public PageListData findList(Map param, int pageNum, int pageSize) { String hql = "from User"; Object params[] = param.values().toArray(); return dao.findList(User.class, hql, params, pageNum, pageSize); } public boolean isExistSameProperty(Map param) { return true; } public User findById(Integer id) { return dao.findById(User.class, id); } public List<User> findAll() { return dao.findAll(User.class); } public List<User> findByCondition(Map param, int type) { return dao.findByProperty(User.class, null, null, type); } public User checkLogin(User user) { return dao.checkLogin(user); } public UserDAO getDao() { return dao; } public void setDao(UserDAO dao) { this.dao = dao; } }   
  </div> 
  <div>
    (3)bean及其Hibernate实体映射文件 
  </div> 
  <div>
    Student.java 
  </div> 
  <div>
    package com.anxin.bean; public class Student { private int id; private String name; private int age; private String sex; private String address; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public String getAddress() { return address; } public void setAddress(String address) { this.address = address; } }   
  </div> 
  <div>
    User.java 
  </div> 
  <div>
    package com.anxin.bean; public class User implements java.io.Serializable { private int id; private String username; private String password; public User(){} public User(String username,String password){ this.username=username; this.password=password; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getUsername() { return username; } public void setUsername(String username) { this.username = username; } public String getPassword() { return password; } public void setPassword(String password) { this.password = password; } }  
  </div> 
  <div>
    Student.hbm.xml 
  </div> 
  <div>
    <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  <hibernate-mapping> <class name="com.anxin.bean.Student" table="student" catalog="practice"> <id name="id" type="java.lang.Integer"> <column name="id" /> <generator class="native" /> </id> <property name="name" type="java.lang.String"> <column name="name" length="50"/> </property> <property name="age" type="java.lang.Integer"> <column name="age"/> </property> <property name="sex" type="java.lang.String"> <column name="sex" length="1"/> </property> <property name="address" type="java.lang.String"> <column name="address" length="100"/> </property> </class> </hibernate-mapping>   
  </div> 
  <div>
    User.hbm.xml 
  </div> 
  <div>
    <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">  <hibernate-mapping> <class name="com.anxin.bean.User" table="users" catalog="practice"> <id name="id" type="java.lang.Integer"> <column name="id" /> <generator class="native" /> </id> <property name="username" type="java.lang.String"> <column name="username" length="50"/> </property> <property name="password" type="java.lang.String"> <column name="password" length="50"/> </property> </class> </hibernate-mapping>   
  </div> 
  <div>
    4、逻辑处理Action层 
  </div> 
  <div>
    BaseAction.java 
  </div> 
  <div>
    package com.anxin.struts.action; import com.anxin.util.OVLoadProperties; import com.anxin.util.PageListData; import com.opensymphony.xwork2.ActionSupport; public class BaseAction extends ActionSupport{ protected PageListData pageListData;//分页组件 protected int currentPage=1;//当前页 protected int pageSize=Integer.parseInt(OVLoadProperties.getInstance().getProperties("pageSize"));//每页显示的数目 protected int querytype;//查询类型 protected String condition;//查询条件 public PageListData getPageListData() { return pageListData; } public void setPageListData(PageListData pageListData) { this.pageListData = pageListData; } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getQuerytype() { return querytype; } public void setQuerytype(int querytype) { this.querytype = querytype; } public String getCondition() { return condition==null?"":condition.trim(); } public void setCondition(String condition) { this.condition=(condition==null?"":condition.trim()); } }   
  </div> 
  <div>
    UserAction.java 
  </div> 
  <div>
    package com.anxin.struts.action; import com.anxin.bean.User; import com.anxin.service.UserService; import com.opensymphony.xwork2.ActionContext; public class UserAction extends BaseAction{ private UserService service; private User user; public String login(){ user=service.checkLogin(user); if(user!=null){ ActionContext.getContext().getSession().put("user", user); return "success"; } else{ this.addActionMessage("用户名或密码错误!"); return "input"; } } public UserService getService() { return service; } public void setService(UserService service) { this.service = service; } public User getUser() { return user; } public void setUser(User user) { this.user = user; } }   
  </div> 
  <div>
    StudentAction.java 
  </div> 
  <div>
    package com.anxin.struts.action; import java.util.HashMap; import java.util.Map; import com.anxin.bean.Student; import com.anxin.service.StudentService; public class StudentAction extends BaseAction { private StudentService service; private Student stu; // 转到增加页面 public String toAdd() { return "add"; } // 添加学生 public String add() { service.save(stu); return "success"; } // 转到修页面 public String toUpdate() { stu = service.findById(stu.getId()); return "update"; } // 更新信息 public String update() { Student temp = service.findById(stu.getId()); temp.setId(stu.getId()); temp.setAddress(stu.getAddress()); temp.setAge(stu.getAge()); temp.setName(stu.getName()); temp.setSex(stu.getSex()); service.update(temp); return "success"; } // 查询列表 public String query() { Map<String, String> param = new HashMap<String, String>(); if (!"".equals(condition)) { if (querytype == 1) { param.put("name like", "%" + condition + "%"); } else if (querytype == 2) { param.put("sex =", condition); } } pageListData = service.findList(param, currentPage, pageSize); return "query"; } // 删除学生 public String delete() { service.deleteById(stu.getId()); return "success"; } public StudentService getService() { return service; } public void setService(StudentService service) { this.service = service; } public Student getStu() { return stu; } public void setStu(Student stu) { this.stu = stu; } }   
  </div> 
  <div>
    5、公用的一些类 
  </div> 
  <div>
    OpenSessionInViewFilter.java(重写spring包中的OpenSessionInViewFilter类，目的是解决事务提交出现的bug) 
  </div> 
  <div>
    package com.anxin.util; import org.hibernate.FlushMode; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.springframework.dao.DataAccessResourceFailureException; import org.springframework.orm.hibernate3.SessionFactoryUtils; public class OpenSessionInViewFilter extends org.springframework.orm.hibernate3.support.OpenSessionInViewFilter { /** * we do a different flushmode than in the codebase * here */ protected Session getSession(SessionFactory sessionFactory) throws DataAccessResourceFailureException { Session session = SessionFactoryUtils.getSession(sessionFactory, true); session.setFlushMode(FlushMode.COMMIT); return session; } /** * we do an explicit flush here just in case * we do not have an automated flush */ protected void closeSession(Session session, SessionFactory factory) { session.flush(); super.closeSession(session, factory); } }  
  </div> 
  <div>
    PageListData.java(分页组件) 
  </div> 
  <div>
    package com.anxin.util; import java.util.ArrayList; import java.util.List; import java.util.Locale; import javax.servlet.http.HttpServletRequest; public class PageListData { // 分页结果集 private List dataList = null; // 记录总数 private int totalcount = 0; // 每页显示记录数 private int pageSize = 0; // 当前页数 private int currentPage = 1; // 总页数 private int totalPageCount = 1; //分页页脚 private String footer; /*初始化分页组件*/ public PageListData(int totalcount, int pageSize, int currentPage, List dataList) { setTotalcount(totalcount); setPageSize(pageSize); setCurrentPage(currentPage); setDataList(dataList); setFooter(getFooter()); } /** * 封装分页栏函数 必需被包含在某个Form之中 * * @return String pages 当前页号 pageSize 每页显示行数 */ public String getFooter() { StringBuffer pageStr = new StringBuffer(""); pageStr.append("<center><p class='pages'>"); int totalPages = getTotalPageCount(); // 总页数 int prevPage = currentPage - 1; // 上一页 int nextPage = currentPage + 1; // 下一页 pageStr.append("<span style="color:#6795B4;" mce_style="color:#6795B4;">共有" + totalcount + "条记录</span>  "); pageStr.append("<span style="color:#6795B4;" mce_style="color:#6795B4;">第" + currentPage + "页/共" + totalPages + "页</span>  "); if (currentPage > 1) pageStr .append("<span><a style="cursor: pointer;text-decoration:underline;color:#6795B4" mce_style="cursor: pointer;text-decoration:underline;color:#6795B4"οnclick='document.getElementById(/"pages/").value=1;document.getElementById(/"pages/").form.submit();'>首页</a></span>  "); if (currentPage == 1) pageStr .append("<span style="color:#6795B4" mce_style="color:#6795B4">首页</span>    "); if (currentPage > 1) pageStr .append("<span><a style="cursor: pointer;text-decoration:underline;color:#6795B4" mce_style="cursor: pointer;text-decoration:underline;color:#6795B4" οnclick='document.getElementById(/"pages/").value=" + prevPage + ";document.getElementById(/"pages/").form.submit();'>上一页</a></span>  "); if (currentPage <= 1) pageStr .append("<span style="color:#6795B4" mce_style="color:#6795B4">上一页</span>  "); if (currentPage < totalPages) pageStr .append("<span><a style="cursor: pointer;text-decoration:underline;color:#6795B4;" mce_style="cursor: pointer;text-decoration:underline;color:#6795B4;" οnclick='document.getElementById(/"pages/").value=" + nextPage + ";document.getElementById(/"pages/").form.submit();'>下一页</a></span>  "); if (currentPage >= totalPages) pageStr .append("<span style="color:#6795B4;" mce_style="color:#6795B4;">下一页</span>  "); if (currentPage < totalPages) pageStr .append("<span><a style="cursor: pointer;text-decoration:underline;color:#6795B4;" mce_style="cursor: pointer;text-decoration:underline;color:#6795B4;" οnclick='document.getElementById(/"pages/").value=" + totalPages + ";document.getElementById(/"pages/").form.submit();'>末页</a></span>  "); if (currentPage == totalPages) pageStr .append("<span style="color:#6795B4;" mce_style="color:#6795B4;">末页</span>  "); pageStr .append("<span style="color:#6795B4;" mce_style="color:#6795B4;">跳转至第:<input type='text' value='" + currentPage + "'id='jumpPageBox' size='2' οnblur='checkCurrentPage(document.getElementById(/"jumpPageBox/").value," + totalPages + ")'/>页<input class='right-button02' type='button' value='跳转' οnclick='document.getElementById(/"pages/").value=document.getElementById(/"jumpPageBox/").value;document.getElementById(/"pages/").form.submit();'/></span>"); pageStr.append("</p></center>"); pageStr.append("<input type='hidden' value='" + currentPage + "' name='currentPage' id='pages' />"); pageStr.append("<input type='hidden' value='" + pageSize + "' name='pageSize' id='pageSize' />"); return pageStr.toString(); } public List getDataList() { return dataList; } public void setDataList(List dataList) { this.dataList = dataList; } public int getTotalcount() { return totalcount; } public void setTotalcount(int totalcount) { this.totalcount = totalcount; } public int getPageSize() { return pageSize; } public void setPageSize(int pageSize) { this.pageSize = pageSize; } public int getCurrentPage() { return currentPage; } public void setCurrentPage(int currentPage) { this.currentPage = currentPage; } //计算总页数，如果为0则置为1 public int getTotalPageCount() { int p; if (totalcount % pageSize == 0) { p=totalcount / pageSize; } else { p=totalcount / pageSize + 1; } return p==0?1:p; } public void setTotalPageCount(int totalPageCount) { this.totalPageCount = totalPageCount; } public void setFooter(String footer) { this.footer = footer; } }   
  </div> 
  <div>
    OVLoadProperties.java(读取properties文件的内容) 
  </div> 
  <div>
    package com.anxin.util; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStream; import java.util.Properties; //单例模式实现读取zxc.properties文件的内容 public class OVLoadProperties { // 声明一个自己的实例 private static OVLoadProperties instance = new OVLoadProperties(); final static String fileName = "/config.properties"; // 返回该实例 public static synchronized OVLoadProperties getInstance() { return instance; } // 获取key所对应的值 public String getProperties(String key) { Properties p = new Properties(); InputStream is = null; try { // zxc.properties文件放在src目录的下边 is = OVLoadProperties.class.getResourceAsStream(fileName); if (is == null) is = new FileInputStream(fileName); p.load(is); } catch (Exception e) { System.out.println("加载文件出错啦!" + e.getMessage()); } finally { if (is != null) { try { is.close(); } catch (IOException e) { // TODO Auto-generated catch block System.out.println(e.getMessage()); } } } return p.getProperty(key); } }  
  </div> 
  <div>
    confic.properties 
  </div> 
  <div>
    pageSize=5  
  </div> 
  <div>
    log4j.properties 
  </div> 
  <div>
    log4j.debug=true log4j.rootLogger=DEBUG,A1 log4j.appender.A1=org.apache.log4j.ConsoleAppender log4j.appender.A1.Threshold=info log4j.appender.A1.layout=org.apache.log4j.PatternLayout log4j.appender.A1.layout.ConversionPattern=%-4r %-5p [%t] %37c %3x - %m%n   
  </div> 
  <div>
    6、过滤器和拦截器 
  </div> 
  <div>
    LoginFilter.java(jsp页面过滤器) 
  </div> 
  <div>
    package com.anxin.filter; import java.io.IOException; import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; import com.anxin.bean.User; public class LoginFilter implements Filter{ public void destroy(){ } public void doFilter(ServletRequest request,ServletResponse response,FilterChain chain) throws IOException,ServletException{ HttpSession session=((HttpServletRequest)request).getSession(); ((HttpServletResponse)response).setHeader("Pragma","No-cache"); ((HttpServletResponse)response).setHeader("Cache-Control","no-cache"); ((HttpServletResponse)response).setHeader("Cache-Control", "no-store"); ((HttpServletResponse)response).setDateHeader("Expires",0); User user=(User)session.getAttribute("user"); String url=(((HttpServletRequest)request).getRequestURI()); if(url.endsWith("/login.jsp")||url.endsWith("/BaseProject/")){ chain.doFilter(request, response); }else{ if(session.getAttribute("user")==null){ ((HttpServletResponse)response).sendRedirect(((HttpServletRequest)request).getContextPath()+"/login.jsp"); }else{ chain.doFilter(request, response); } } } public void init(FilterConfig filterConfig)throws ServletException{ } }   
  </div> 
  <div>
    LoginedCheckInterceptor(action拦截器) 
  </div> 
  <div>
    package com.anxin.struts.interceptor; import javax.servlet.http.HttpServletResponse; import org.apache.struts2.ServletActionContext; import com.anxin.bean.User; import com.opensymphony.xwork2.ActionInvocation; import com.opensymphony.xwork2.interceptor.AbstractInterceptor; /** session过期、登录有效性及操作的权限验证拦截器 */ public class LoginedCheckInterceptor extends AbstractInterceptor { /** 拦截请求并进行登录有效性验证 */ public String intercept(ActionInvocation ai) throws Exception { //取得请求的URL String url = ServletActionContext.getRequest().getRequestURL().toString(); HttpServletResponse response=ServletActionContext.getResponse(); response.setHeader("Pragma","No-cache"); response.setHeader("Cache-Control","no-cache"); response.setHeader("Cache-Control", "no-store"); response.setDateHeader("Expires",0); User user = null; //对登录与注销请求直接放行,不予拦截 if (url.indexOf("user_login.action")!=-1 || url.indexOf("logout.action")!=-1){ return ai.invoke(); } else{ //验证Session是否过期 if(!ServletActionContext.getRequest().isRequestedSessionIdValid()){ //session过期,转向session过期提示页,最终跳转至登录页面 return "tologin"; } else{ user = (User)ServletActionContext.getRequest().getSession().getAttribute("user"); //验证是否已经登录 if (user==null){ //尚未登录,跳转至登录页面 return "tologin"; }else{ return ai.invoke(); } } } } }  
  </div> 
  <div>
    7、S2SH整合核心配置文件 
  </div> 
  <div>
    struts.properties 
  </div> 
  <div>
    struts.i18n.encoding = gbk struts.custom.i18n.resources=messageResource struts.locale=zh_CN struts.objectFactory=spring struts.devMode=true struts.ui.theme=simple struts.ui.templateDir=template struts.ui.templateSuffix=ftl  
  </div> 
  <div>
    struts.xml 
  </div> 
  <div>
    <?xml version="1.0" encoding="gbk"?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"><struts> <package name="anxin" extends="struts-default">  <interceptors> <interceptor name="loginedCheck" class="com.anxin.struts.interceptor.LoginedCheckInterceptor"/> <interceptor-stack name="mystack"> <interceptor-ref name="loginedCheck" /> <interceptor-ref name="defaultStack" /> </interceptor-stack> </interceptors>  <global-results>  <result name="exception">exception.jsp</result> <result name="tologin">login.jsp</result> </global-results>  <global-exception-mappings>  <exception-mapping exception="java.lang.Exception" result="exception"/> </global-exception-mappings> <action name="user_*" class="userAction" method="{1}"> <result name="input">login.jsp</result> <result name="success" type="redirect">student_query.action</result> <interceptor-ref name="mystack" /> </action> <action name="student_*" class="studentAction" method="{1}"> <result name="add">jsp/studentAdd.jsp</result> <result name="update">jsp/studentEdit.jsp</result> <result name="query">jsp/studentList.jsp</result> <result name="success" type="redirect">student_query.action</result> <interceptor-ref name="mystack" /> </action> </package> </struts>  
  </div> 
  <div>
    applicationContext.xml 
  </div> 
  <div>
    <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">  <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource">  <property name="driverClass"> <value>com.mysql.jdbc.Driver</value> </property>  <property name="jdbcUrl"> <value>jdbc:mysql://localhost:3306/practice?useUnicode=true&characterEncoding=gbk</value> </property>  <property name="user"> <value>root</value> </property>  <property name="password"> <value>123</value> </property>  <property name="maxPoolSize"> <value>20</value> </property>  <property name="minPoolSize"> <value>2</value> </property>  <property name="initialPoolSize"> <value>2</value> </property>  <property name="maxIdleTime"> <value>20</value> </property> </bean>  <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">  <property name="dataSource" ref="dataSource"/>  <property name="mappingResources"> <list> <value>com/anxin/orm/mapping/User.hbm.xml</value> <value>com/anxin/orm/mapping/Student.hbm.xml</value> </list> </property>  <property name="hibernateProperties"> <props>  <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>  <prop key="show_sql">true</prop>  <prop key="hibernate.jdbc.batch_size">50</prop> </props> </property> </bean>  <bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">  <property name="sessionFactory" ref="sessionFactory"/> </bean>  <bean id="transactionInterceptor" class="org.springframework.transaction.interceptor.TransactionInterceptor">  <property name="transactionManager" ref="transactionManager"/>  <property name="transactionAttributes"> <props>  <prop key="browse*">PROPAGATION_REQUIRED,readOnly</prop> <prop key="list*">PROPAGATION_REQUIRED,readOnly</prop> <prop key="load*">PROPAGATION_REQUIRED,readOnly</prop> <prop key="get*">PROPAGATION_REQUIRED,readOnly</prop> <prop key="is*">PROPAGATION_REQUIRED,readOnly</prop>  <prop key="*">PROPAGATION_REQUIRED</prop> </props> </property> </bean>  <bean class="org.springframework.aop.framework.autoproxy.BeanNameAutoProxyCreator">  <property name="beanNames"> <list> <value>userService</value> <value>studentService</value> </list> </property>  <property name="proxyTargetClass"> <value>true</value> </property>  <property name="interceptorNames"> <list> <value>transactionInterceptor</value> </list> </property> </bean>   <bean id="userdao" class="com.anxin.dao.impl.UserDAOImpl"> <property name="sessionFactory" ref="sessionFactory"/> </bean> <bean id="studentdao" class="com.anxin.dao.impl.StudentDAOImpl"> <property name="sessionFactory" ref="sessionFactory"/> </bean> <bean id="userService" class="com.anxin.service.impl.UserServiceImpl"> <property name="dao" ref="userdao"/> </bean> <bean id="studentService" class="com.anxin.service.impl.StudentServiceImpl"> <property name="dao" ref="studentdao"/> </bean>    <bean id="userAction" class="com.anxin.struts.action.UserAction" scope="prototype"> <property name="service" ref="userService"/> </bean> <bean id="studentAction" class="com.anxin.struts.action.StudentAction" scope="prototype"> <property name="service" ref="studentService"/> </bean>  </beans>  
  </div> 
  <div>
    web.xml 
  </div> 
  <div>
    <?xml version="1.0" encoding="UTF-8"?> <web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">  <context-param> <param-name>contextConfigLocation</param-name> <param-value>/WEB-INF/classes/applicationContext.xml</param-value> </context-param>  <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener>  <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter>  <filter> <filter-name>encodingFilter</filter-name> <filter-class>org.springframework.web.filter.CharacterEncodingFilter</filter-class> <init-param> <param-name>encoding</param-name> <param-value>gbk</param-value> </init-param> </filter> <filter> <filter-name>hibernateFilter</filter-name> <filter-class>com.anxin.util.OpenSessionInViewFilter</filter-class> </filter> <filter-mapping> <filter-name>hibernateFilter</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.action</url-pattern> </filter-mapping> <filter-mapping> <filter-name>encodingFilter</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping> <filter> <filter-name>struts-cleanup</filter-name> <filter-class>org.apache.struts2.dispatcher.ActionContextCleanUp</filter-class> </filter> <filter-mapping> <filter-name>struts-cleanup</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <filter>  <filter-name>LoginFilter</filter-name>  <filter-class> com.anxin.filter.LoginFilter </filter-class> </filter> <filter-mapping> <filter-name>LoginFilter</filter-name> <url-pattern>*.jsp</url-pattern> </filter-mapping> <servlet> <servlet-name>dwr</servlet-name> <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>  <init-param> <param-name>debug</param-name> <param-value>true</param-value> </init-param> <init-param> <param-name>crossDomainSessionSecurity</param-name> <param-value>false</param-value> </init-param> </servlet> <servlet-mapping> <servlet-name>dwr</servlet-name> <url-pattern>/dwr/*</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list>  <error-page> <error-code>404</error-code> <location>/404.htm</location> </error-page> <error-page> <error-code>500</error-code> <location>/500.htm</location> </error-page> </web-app>   
  </div> 
  <div>
    dwr.xml 
  </div> 
  <div>
    <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE dwr PUBLIC "-//GetAhead Limited//DTD Direct Web Remoting 1.0//EN" "http://www.getahead.ltd.uk/dwr/dwr10.dtd"> <dwr>  <allow>       <create javascript="studentService" creator="spring"> <param name="beanName" value="studentService"/> </create> </allow> </dwr>   
  </div> 
  <div> 
   <strong>三、运行效果</strong> 
  </div> 
  <div>
    页面没怎么修饰，比较土哈 
  </div> 
  <div>
    (1)登陆页面 
  </div> 
  <div>  
  </div> 
  <div>
    (2)学生信息列表页面 
  </div> 
  <div>  
  </div> 
  <div>
    (3)学生信息添加页面 
  </div> 
  <div>  
  </div> 
  <div>
    (4)学生信息修改页面 
  </div> 
  <div>  
  </div> 
  <div> 
   <strong>四、备注</strong> 
  </div> 
  <div> 
   <span style="font-family:mceinline;"><span style="text-decoration:underline;"><strong>此工程我已经上传到csdn下载板块，请访问http://download.csdn.net/source/2996382去下载此工程</strong></span></span> 
  </div> 
  <p> </p> 
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                           title="2024.9.6 Python，华为笔试题总结，字符串格式化，字符串操作，广度优先搜索解决公司组织绩效互评问题，无向图" target="_blank">2024.9.6 Python，华为笔试题总结，字符串格式化，字符串操作，广度优先搜索解决公司组织绩效互评问题，无向图</a>
                        <span class="text-muted">RaidenQ</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E5%8D%8E%E4%B8%BA/1.htm">华为</a><a class="tag" taget="_blank" href="/search/leetcode/1.htm">leetcode</a><a class="tag" taget="_blank" href="/search/%E7%AE%97%E6%B3%95/1.htm">算法</a><a class="tag" taget="_blank" href="/search/%E5%8A%9B%E6%89%A3/1.htm">力扣</a><a class="tag" taget="_blank" href="/search/%E5%B9%BF%E5%BA%A6%E4%BC%98%E5%85%88/1.htm">广度优先</a><a class="tag" taget="_blank" href="/search/%E6%97%A0%E5%90%91%E5%9B%BE/1.htm">无向图</a>
                        <div>1.字符串格式化name="Alice"age=30formatted_string="Name:{},Age:{}".format(name,age)print(formatted_string)或者name="Alice"age=30formatted_string=f"Name:{name},Age:{age}"print(formatted_string)2.网络健康检查第一行有两个整数m</div>
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                           title="2024.8.22 Python，链表两数之和，链表快速反转，二叉树的深度，二叉树前中后序遍历，N叉树递归遍历，翻转二叉树" target="_blank">2024.8.22 Python，链表两数之和，链表快速反转，二叉树的深度，二叉树前中后序遍历，N叉树递归遍历，翻转二叉树</a>
                        <span class="text-muted">RaidenQ</span>
<a class="tag" taget="_blank" href="/search/python/1.htm">python</a><a class="tag" taget="_blank" href="/search/%E9%93%BE%E8%A1%A8/1.htm">链表</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a>
                        <div>1.链表两数之和输入：l1=[2,4,3],l2=[5,6,4]输出：[7,0,8]解释：342+465=807.示例2：输入：l1=[0],l2=[0]输出：[0]示例3：输入：l1=[9,9,9,9,9,9,9],l2=[9,9,9,9]输出：[8,9,9,9,0,0,0,1]昨天的这个题，用自己的办法写的麻烦的要死，然后刚才一看chat归类的办法，感觉自己像个智障。classListNode</div>
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                        <span class="text-muted">barbyQAQ</span>
<a class="tag" taget="_blank" href="/search/c%2B%2B/1.htm">c++</a><a class="tag" taget="_blank" href="/search/c%2B%2B/1.htm">c++</a><a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E7%AE%97%E6%B3%95/1.htm">算法</a>
                        <div>原文链接：https://blog.csdn.net/qq_51470638/article/details/142151502一、背景在面向对象编程时，常常要添加类成员变量。然而类成员一旦多了之后，也会带来干扰。拿到一个类，一看成员变量好几十个，就问你怕不怕？二、解决思路可以借助函数式编程思想，来消除一些不必要的类成员变量。三、实例举个例子：classClassA{public:...intfu</div>
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                        <span class="text-muted">Bartender_Jill</span>
<a class="tag" taget="_blank" href="/search/Graphics%E5%9B%BE%E5%BD%A2%E5%AD%A6%E7%AC%94%E8%AE%B0/1.htm">Graphics图形学笔记</a><a class="tag" taget="_blank" href="/search/unity/1.htm">unity</a><a class="tag" taget="_blank" href="/search/%E6%B8%B8%E6%88%8F%E5%BC%95%E6%93%8E/1.htm">游戏引擎</a><a class="tag" taget="_blank" href="/search/%E5%8A%A8%E7%94%BB/1.htm">动画</a>
                        <div>1.前言最近任务需要用到Unity在场景中随机生成物体，且这些物体不能重叠，简单记录一下。参考资料:Howtoensurethatspawnedtargetsdonotoverlap?2.结果与代码结果如下所示：代码如下所示：usingSystem.Collections.Generic;usingUnityEngine;namespaceAssets.Scripts{publicclassNew</div>
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                           title="Table列表复现框实现【勾选-搜索-再勾选】" target="_blank">Table列表复现框实现【勾选-搜索-再勾选】</a>
                        <span class="text-muted">～四时春～</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a><a class="tag" taget="_blank" href="/search/elementui/1.htm">elementui</a><a class="tag" taget="_blank" href="/search/vue/1.htm">vue</a>
                        <div>Table列表复现框实现【勾选-搜索-再勾选】概要整体架构流程代码实现技术细节注意参考文献概要最近在开发时遇到一个问题，在进行表单渲染时，正常选中没有问题，单如果需要搜索选中时，一个是已选中的不会回填，二是在搜索的结果中进行选中，没有实现，经过排查，查找资料后实现。例如：整体架构流程具体的实现效果如下：代码实现{{scope.row.userName}}已选区{{userItem.userName</div>
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                        <span class="text-muted">汉子萌萌哒</span>
<a class="tag" taget="_blank" href="/search/CCF/1.htm">CCF</a><a class="tag" taget="_blank" href="/search/noi/1.htm">noi</a><a class="tag" taget="_blank" href="/search/%E7%AE%97%E6%B3%95/1.htm">算法</a><a class="tag" taget="_blank" href="/search/%E6%95%B0%E6%8D%AE%E7%BB%93%E6%9E%84/1.htm">数据结构</a><a class="tag" taget="_blank" href="/search/c%2B%2B/1.htm">c++</a>
                        <div>一、单项选择题(共15题，每题2分，共计30分；每题有且仅有一个正确选项)1.以下哪种功能没有涉及C++语言的面向对象特性支持：()。A.C++中调用printf函数B.C++中调用用户定义的类成员函数C.C++中构造一个class或structD.C++中构造来源于同一基类的多个派生类题目解析【解析】正确答案:AC++基础知识，面向对象和类有关，类又涉及父类、子类、继承、派生等关系，printf</div>
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                        <span class="text-muted">私语茶馆</span>
<a class="tag" taget="_blank" href="/search/%E4%BA%91%E9%83%A8%E7%BD%B2%E4%B8%8E%E5%BC%80%E5%8F%91/1.htm">云部署与开发</a><a class="tag" taget="_blank" href="/search/%E6%9E%B6%E6%9E%84%E5%8F%8A%E4%BA%A7%E5%93%81%E7%81%B5%E6%84%9F%E8%AE%B0%E5%BD%95/1.htm">架构及产品灵感记录</a><a class="tag" taget="_blank" href="/search/RSA2048/1.htm">RSA2048</a><a class="tag" taget="_blank" href="/search/%E7%A7%81%E9%92%A5%E5%8A%A0%E5%AF%86/1.htm">私钥加密</a>
                        <div>作者：私语茶馆1.相关章节（1）非对称加密算法原理与应用1——秘钥的生成-CSDN博客第一章节讲述的是创建秘钥对，并将公钥和私钥导出为文件格式存储。本章节继续讲如何利用私钥加密内容，包括从密钥库或文件中读取私钥，并用RSA算法加密文件和String。2.私钥加密的概述本文主要基于第一章节的RSA2048bit的非对称加密算法讲述如何利用私钥加密文件。这种加密后的文件，只能由该私钥对应的公钥来解密。</div>
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                        <span class="text-muted">图像处理大大大大大牛啊</span>
<a class="tag" taget="_blank" href="/search/opencv%E5%AE%9E%E6%88%98%E4%BB%A3%E7%A0%81%E8%AE%B2%E8%A7%A3/1.htm">opencv实战代码讲解</a><a class="tag" taget="_blank" href="/search/yolo/1.htm">yolo</a><a class="tag" taget="_blank" href="/search/onnx/1.htm">onnx</a><a class="tag" taget="_blank" href="/search/ncnn/1.htm">ncnn</a><a class="tag" taget="_blank" href="/search/%E5%AE%89%E5%8D%93/1.htm">安卓</a>
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                        <span class="text-muted">junjun2018</span>

<div>队列：像排队吃饭一样，先到的先点菜，后来的后点菜。以下代码展示使用单向列表实现的队列。//链表是以节点为单位的，对于单向链表，每个节点中包含一个值和指向下一个对象的引用publicclassNode{Objectvalue;Nodenext;publicNode(Objectvalue){this.value=value;}publicObjectgetValue(){returnvalue;}p</div>
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                        <span class="text-muted">Amy木婉清</span>

<div>1.通过内部类实现2.通过匿名内部类实现3.通过事件源所在类实现4.通过外部类实现5.布局文件中onclick属性(针对点击事件)1.通过内部类实现代码:privateButtonmBtnEvent;//oncreate中mBtnEvent.setOnClickListener(newOnClick());//内部类实现监听classOnClickimplementsView.OnClickLis</div>
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                        <span class="text-muted">最帅猪猪侠</span>
<a class="tag" taget="_blank" href="/search/golang/1.htm">golang</a><a class="tag" taget="_blank" href="/search/%E5%BC%80%E5%8F%91%E8%AF%AD%E8%A8%80/1.htm">开发语言</a><a class="tag" taget="_blank" href="/search/%E5%90%8E%E7%AB%AF/1.htm">后端</a>
                        <div>Golang语言基础知识点小总结1.go语言有两大类型：值类型：数值类型，bool，string，数组，struct结构体变量直接存储值，内存通常在栈中分配,修改值,不会对源对象产生影响引用类型：指针，slice切片，管道chan，map，interface变量存储的是一个地址，这个地址对应的空间才真正存储数据值，内存通常在堆上分配，当没有任何变量引用这个地址时，该地址对应的数据空间就成为一个垃圾</div>
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                        <span class="text-muted">JamesSawyer</span>

<div>if(typeofString.prototype.trim!=='function'){String.prototype.trim=function(){//这个正则的意思是//'^''$'表示结束和开始//'^\s*'表示任意以空格开头的空格//'\s*$'表示任意以空格结尾的空格//'\S*'表示任意非空字符//'$1'表示'(\S*(\s*\S*)*)'returnthis.replace</div>
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                        <span class="text-muted">你的眼睛會笑</span>
<a class="tag" taget="_blank" href="/search/vue2/1.htm">vue2</a><a class="tag" taget="_blank" href="/search/vue.js/1.htm">vue.js</a><a class="tag" taget="_blank" href="/search/javascript/1.htm">javascript</a><a class="tag" taget="_blank" href="/search/%E5%89%8D%E7%AB%AF/1.htm">前端</a>
                        <div>vuerender函数详解(配参数详解)在Vue3中，`render`函数被用来代替Vue2中的模板语法。它接收一个h函数（或者是`createElement`函数的别名），并且返回一个虚拟DOM。render函数的语法结构如下：render(h){returnh('div',{class:'container'},'Hello,World!')}在上面的示例中，我们使用h函数创建了一个div元素</div>
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                           title="[Swift]LeetCode943. 最短超级串 | Find the Shortest Superstring" target="_blank">[Swift]LeetCode943. 最短超级串 | Find the Shortest Superstring</a>
                        <span class="text-muted">黄小二哥</span>
<a class="tag" taget="_blank" href="/search/swift/1.htm">swift</a>
                        <div>★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★➤微信公众号：山青咏芝（shanqingyongzhi）➤博客园地址：山青咏芝（https://www.cnblogs.com/strengthen/）➤GitHub地址：https://github.com/strengthen/LeetCode➤原文地址：https://www.cnblogs.com/streng</div>
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                                       title="Spring中@Value注解，需要注意的地方" target="_blank">Spring中@Value注解，需要注意的地方</a>
                                    <span class="text-muted">无量</span>
<a class="tag" taget="_blank" href="/search/spring/1.htm">spring</a><a class="tag" taget="_blank" href="/search/bean/1.htm">bean</a><a class="tag" taget="_blank" href="/search/%40Value/1.htm">@Value</a><a class="tag" taget="_blank" href="/search/xml/1.htm">xml</a>
                                    <div>Spring 3以后,支持@Value注解的方式获取properties文件中的配置值，简化了读取配置文件的复杂操作 
 
 
1、在applicationContext.xml文件(或引用文件中)中配置properties文件 
 
<bean id="appProperty"
    class="org.springframework.beans.fac</div>
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                                       title="mongoDB 分片" target="_blank">mongoDB 分片</a>
                                    <span class="text-muted">开窍的石头</span>
<a class="tag" taget="_blank" href="/search/mongodb/1.htm">mongodb</a>
                                    <div>    mongoDB的分片。要mongos查询数据时候 先查询configsvr看数据在那台shard上，configsvr上边放的是metar信息，指的是那条数据在那个片上。由此可以看出mongo在做分片的时候咱们至少要有一个configsvr,和两个以上的shard（片）信息。 
    第一步启动两台以上的mongo服务 
&nb</div>
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                                    <span class="text-muted">0624chenhong</span>
<a class="tag" taget="_blank" href="/search/oracle/1.htm">oracle</a>
                                    <div>这篇写得很好，引自 
http://www.cnblogs.com/lanzi/archive/2010/10/26/1861338.html 
 
 
OVER(PARTITION BY)函数用法 
 
 2010年10月26日 
 
OVER(PARTITION BY)函数介绍 
 
开窗函数        &nb</div>
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                                    <span class="text-muted">一炮送你回车库</span>
<a class="tag" taget="_blank" href="/search/Android%E5%BC%80%E5%8F%91/1.htm">Android开发</a>
                                    <div>首先通知：凡是安装360、豌豆荚、腾讯管家的全部卸载，然后再尝试。 
  
一直没搞明白这个问题咋出现的，但今天看到一个方法，搞定了！原来是豌豆荚占用了 5037 端口导致。 
参见原文章：一个豌豆荚引发的血案——关于ADB server didn't ACK的问题 
简单来讲，首先将Windows任务进程中的豌豆荚干掉，如果还是不行，再继续按下列步骤排查。 
&nb</div>
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                                    <span class="text-muted">换个号韩国红果果</span>
<a class="tag" taget="_blank" href="/search/JavaScript/1.htm">JavaScript</a><a class="tag" taget="_blank" href="/search/canvas/1.htm">canvas</a>
                                    <div>pixl的绘制，1.如果绘制点正处于相邻像素交叉线，绘制x像素的线宽，则从交叉线分别向前向后绘制x/2个像素，如果x/2是整数，则刚好填满x个像素，如果是小数，则先把整数格填满，再去绘制剩下的小数部分，绘制时，是将小数部分的颜色用来除以一个像素的宽度，颜色会变淡。所以要用整数坐标来画的话（即绘制点正处于相邻像素交叉线时），线宽必须是2的整数倍。否则会出现不饱满的像素。 
2.如果绘制点为一个像素的</div>
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                                    <span class="text-muted">灵静志远</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/jvm/1.htm">jvm</a><a class="tag" taget="_blank" href="/search/jsp/1.htm">jsp</a><a class="tag" taget="_blank" href="/search/%E7%BC%96%E7%A0%81/1.htm">编码</a>
                                    <div>1、JVM中单个字符占用的字节长度跟编码方式有关，而默认编码方式又跟平台是一一对应的或说平台决定了默认字符编码方式；2、对于单个字符：ISO-8859-1单字节编码，GBK双字节编码，UTF-8三字节编码；因此中文平台(中文平台默认字符集编码GBK)下一个中文字符占2个字节，而英文平台(英文平台默认字符集编码Cp1252(类似于ISO-8859-1))。 
3、getBytes()、getByte</div>
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                                    <span class="text-muted">darkranger</span>
<a class="tag" taget="_blank" href="/search/calendar/1.htm">calendar</a><a class="tag" taget="_blank" href="/search/getinstance/1.htm">getinstance</a>
                                    <div>Date plandate = planDate.toDate();
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");
Calendar cal = Calendar.getInstance();
cal.setTime(plandate);
// 取得三个月后时间
cal.add(Calendar.M</div>
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                                    <span class="text-muted">aijuans</span>
<a class="tag" taget="_blank" href="/search/%E6%95%B0%E6%8D%AE%E5%BA%93%E5%A4%8D%E4%B9%A0/1.htm">数据库复习</a>
                                    <div>关系数据库中的关系必须满足一定的要求。满足不同程度要求的为不同范式。数据库的设计范式是数据库设计所需要满足的规范。只有理解数据库的设计范式，才能设计出高效率、优雅的数据库，否则可能会设计出错误的数据库. 
目前，主要有六种范式：第一范式、第二范式、第三范式、BC范式、第四范式和第五范式。满足最低要求的叫第一范式，简称1NF。在第一范式基础上进一步满足一些要求的为第二范式，简称2NF。其余依此类推。</div>
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                                    <span class="text-muted">atongyeye</span>
<a class="tag" taget="_blank" href="/search/jbpm/1.htm">jbpm</a>
                                    <div>工作流在工作中变得越来越重要，很多朋友想学工作流却不知如何入手。 很多朋友习惯性的这看一点，那了解一点，既不系统，也容易半途而废。好比学武功，最好的办法是有一本武功秘籍。研究明白，则犹如打通任督二脉。 
 
 
系统学习工作流，很重要的一本书《JBPM工作流开发指南》。 
 
本人苦苦学习两个月，基本上可以解决大部分流程问题。整理一下学习思路，有兴趣的朋友可以参考下。 
 
1  首先要</div>
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                                    <span class="text-muted">百合不是茶</span>
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一:SQLiteOpenHelper创建数据库: 
  
1,SQLi</div>
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                                    <span class="text-muted">bijian1013</span>
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        譬如：统计每id数并且只显示数大于3 
select id ,count(id) from ta</div>
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                                    <span class="text-muted">征客丶</span>
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                                    <div>进入 command mode （命令行模式） 
按 esc 键 
再按 shift + 冒号 
 
注：以下命令中 带 $ 【在命令行模式下进行】，不带 $ 【在非命令行模式下进行】 
 
一、文件操作 
1.1、强制退出不保存 
$ q! 
1.2、保存 
$ w 
1.3、保存并退出 
$ wq 
1.4、刷新或重新加载已打开的文件 
$ e 
 
二、光标移动 
2.1、跳到指定行 
数字</div>
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                                    <span class="text-muted">bit1129</span>
<a class="tag" taget="_blank" href="/search/spark/1.htm">spark</a>
                                    <div>  
对于K/V类型的RDD,如下操作是什么含义？ 
  
val rdd = sc.parallelize(List(("A",3),("C",6),("A",1),("B",5))
rdd.reduceByKey(_+_).collect 
 reduceByKey在这里的操作，是把</div>
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                                    <span class="text-muted">BlueSkator</span>
<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E8%99%9A%E6%8B%9F%E6%9C%BA/1.htm">虚拟机</a>
                                    <div>java类加载机制 
1.java类加载器的树状结构 
引导类加载器 
^ 
| 
扩展类加载器 
^ 
| 
系统类加载器 
java使用代理模式来完成类加载，java的类加载器也有类似于继承的关系，引导类是最顶层的加载器，它是所有类的根加载器，它负责加载java核心库。当一个类加载器接到装载类到虚拟机的请求时，通常会代理给父类加载器，若已经是根加载器了，就自己完成加载。 
虚拟机区分一个Cla</div>
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                                    <div>  <script>     var num=1; function AddInput() {      var str="";     str+="<input </div>
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<a class="tag" taget="_blank" href="/search/java/1.htm">java</a><a class="tag" taget="_blank" href="/search/%E8%AE%BE%E8%AE%A1%E6%A8%A1%E5%BC%8F/1.htm">设计模式</a>
                                    <div>声明： 本文只为方便我个人查阅和理解，详细的分析以及源代码请移步 原作者的博客http://chjavach.iteye.com/

public class Singleton {
}

/*
 * 懒汉模式。注意，getInstance如果在多线程环境中调用，需要加上synchronized，否则存在线程不安全问题
 */
class LazySingleton</div>
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                                    <span class="text-muted">daizj</span>
<a class="tag" taget="_blank" href="/search/oracle/1.htm">oracle</a>
                                    <div>1. 什么是flashback data archive 
 
Flashback data archive是oracle 11g中引入的一个新特性。Flashback archive是一个新的数据库对象，用于存储一个或多表的历史数据。Flashback archive是一个逻辑对象，概念上类似于表空间。实际上flashback archive可以看作是存储一个或多个表的所有事务变化的逻辑空间。 </div>
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                                    <div>/*
	2013年3月15日15:16:24
	malloc 就memory(内存) allocate(分配)的缩写
	本程序没有实际含义，只是理解使用	
 */
# include <stdio.h>
# include <malloc.h>

int main(void)
{
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	int * p </div>
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                                    <div>     
 
  
  原文链接 : The official raywenderlich.com Objective-C style guide  
  原文作者 : raywenderlich.com Team  
  译文出自 : raywenderlich.com Objective-C编码规范  
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                                    <div>从今天开始笔者陆续发表一些性能测试相关的文章，主要是对自己前段时间学习的总结，由于水平有限，性能测试领域很深，本人理解的也比较浅，欢迎各位大咖批评指正。 
主要内容包括： 
一、性能测试指标 
吞吐量、TPS、响应时间、负载、可扩展性、PV、思考时间 
http://frank1234.iteye.com/blog/2180305 
 
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生产环境相同 基准测试 预热等 
htt</div>
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                                    <div>  
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;

import org.junit.Test;

abstract class BaseDao<T> {
	public void getType() {
		//Class<E> clazz =</div>
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                                    <div>  
----广告-------------------------------------------------------------- 
网站核心商详页开发 
掌握Java技术，掌握并发/异步工具使用，熟悉spring、ibatis框架； 
掌握数据库技术，表设计和索引优化，分库分表/读写分离； 
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模块依赖性Nginx需要依赖下面3个包 
1. gzip 模块需要 zlib 库 ( 下载: http://www.zlib.net/ ) 
2. rewrite 模块需要 pcre 库 ( 下载: http://www.pcre.org/ ) 
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                                    <div>http://wiki.sdn.sap.com/wiki/display/BOBJ/Optimize+query+with+Query+Stripping+in+Web+Intelligence 
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                                    <div>1、不用PreparedStatements   　　有意思的是，在JDBC出现了许多年后的今天，这个错误依然出现在博客、论坛和邮件列表中，即便要记住和理解它是一件很简单的事。开发者不使用PreparedStatements的原因可能有如下几个：   　　他们对PreparedStatements不了解   　　他们认为使用PreparedStatements太慢了   　　他们认为写Prepar</div>
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