Java进阶-案例训练（十七）(商城项目（2））
文章目录
- 一、登录权限校验
- 二、七天内自动登录（分两步走）
-
- 2.1 第一步（存放到cookie中）
- 2.2 第二步（再次登录用户名密码还在输入框）
- 三、权限修改
- 四、批量删除
- 五、分类分页查询
- 六、分类-添加分类
- 七、分类--修改分类
-
- 7.1 跳转并回显
- 7.2 修改并保存
- 八、分类--分类删除
一、登录权限校验
在filter包中创建LoginFilter.java
package com.zql.web.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.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import com.zql.pojo.User;
/**
* author:Daniel
* version:1.0
*/
@WebFilter("/*")
public class LoginFilter implements Filter{
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
HttpServletRequest req = (HttpServletRequest) request;
//获取请求路径
String uri = req.getRequestURI();
//System.out.println(uri); ///xiaomi/admin/login.jsp
//要放行的路径
if(uri.contains("/login.jsp") || uri.contains("/user") || uri.contains("/css/")
|| uri.contains("/img/") || uri.contains("images") || uri.contains("/js/")) {
chain.doFilter(request, response);
return;
}
//判断用户是否存在
User user = (User) req.getSession().getAttribute("user");
if(user != null) {
//放行
chain.doFilter(request, response);
}else {
//友好提示
req.setAttribute("msg", "兄台，请先登录后再使用~~");
//转发到登录页面
request.getRequestDispatcher("/admin/login.jsp").forward(request, response);
}
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
}
}
最终显示：http://localhost:8080/xiaomi/admin/main.jsp
二、七天内自动登录（分两步走）
2.1 第一步（存放到cookie中）
（1） 在admin/login.jsp 中修改 “忘记密码”为“自动登录”如下
设置为1的目的是，当为“1”时，就是自动登录
（2）在原先基础上编写UserServlet代码：
//七天自动登录
String AutoLogin = request.getParameter("AutoLogin");
if("1".equals(AutoLogin)) {
//创建Cookie
Cookie cookie = new Cookie("autoLogin",user.getUsername()+"@"+user.getPassword());
//创建生存时间 设置7天时间
cookie.setMaxAge(7*24*60*60);
//添加到cookie中
response.addCookie(cookie);
}else {
Cookie cookie = new Cookie("autoLogin","");
cookie.setMaxAge(0);
response.addCookie(cookie);
}
最终显示：
（1）通过debug调试（已经存到了cookie中）
（2）浏览器F12查看（也已经存到了cookie中）
2.2 第二步（再次登录用户名密码还在输入框）
AutoFilter.java
package com.zql.web.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.Cookie;
import javax.servlet.http.HttpServletRequest;
import com.zql.pojo.User;
import com.zql.service.UserService;
import com.zql.service.impl.UserServiceImpl;
/**
* author:Daniel
* version:1.0
*/
public class AutoFilter implements Filter{
@Override
public void destroy() {
// TODO Auto-generated method stub
}
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
//将上层接口中的request转成子接口HttpServletRequest中的req
HttpServletRequest req = (HttpServletRequest) request;
//从session获取user对象（登陆成功）
User aotoUser = (User) req.getSession().getAttribute("user");
if(aotoUser !=null) {
chain.doFilter(request, response);
return;
}
try {
//1.获取存在Cookie中的用户名和密码
Cookie[] cookies = req.getCookies();
//2.判断cookies是否为空
Cookie aotoLogin = null;
if(cookies != null) {
//遍历cookies
for (Cookie cookie : cookies) {
//判断cookies中的哪个是我想要的
if("autoLogin".equals(cookies)) {
aotoLogin = cookie;
//结束遍历
break;
}
}
}
if(aotoLogin == null) {
chain.doFilter(request, response);
return;
}
//aotoLogin不等于空 获取用户名和密码进行登录
String[] value = aotoLogin.getValue().split("@");
String username = value[0];
String password = value[1];
//业务处理
UserService us = new UserServiceImpl();
User user = us.adminLogin(username, password);
if(user != null) {
req.getSession().setAttribute("user", user);
}
chain.doFilter(request, response);
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
public void init(FilterConfig filterConfig) throws ServletException {
// TODO Auto-generated method stub
}
}
最终显示（退出后依然存在用户名和密码）
三、权限修改
（1）修改admin/user_list.jsp
<td>
<c:if test="${p.manager == 0}">
<a href="${pageContext.request.contextPath }/user?method=updateRole&manager=1&uid=${p.uid}">指定管理员</a>
</c:if>
<c:if test="${p.manager == 1}">
<a href="${pageContext.request.contextPath }/user?method=updateRole&manager=0&uid=${p.uid}"><font color='red'>撤销管理员</font></a>
</c:if>
</td>
(2)UserServlet.java
//权限修改
public String updateRole(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
String manager = request.getParameter("manager");
String uid = request.getParameter("uid");
User user = us.updateRole(manager,uid);
//重定向
response.sendRedirect(request.getContextPath()+"/user?method=findUserByPageBean&pageNumber=1");
return null;
}
(3)UserService.java
//权限修改
User updateRole(String manager, String uid) throws Exception;
(4)UserServiceImpl.java
//权限修改
@Override
public User updateRole(String manager, String uid)throws Exception {
return ud.updateRole(manager,uid) ;
}
(5) UserDao.java
//权限修改
User updateRole(String manager, String uid) throws Exception;
(6)UserDaoImpl.java
//权限修改
@Override
public User updateRole(String manager, String uid) throws Exception {
String sql = "update user set manager =? where uid = ?";
Object[] param = {manager,uid};
qr.update(sql, param);
return null;
}
最后显示：
四、批量删除
(1)在user_list.jsp中添加 ${p.uid}
(2)编写 admin/user_list.jsp
<!-- 批量删除 -->
<script type="text/javascript">
/*页面加载 */
$(function() {
/* 批量选择 */
$("#checkbox_main").click(function(){
//alert(111)
//获得批量框的值
var temp = $("#checkbox_main").prop("checked");
$("[name=ids]").prop("checked",temp);/*批量选择 */
});
/* 批量删除 */
$("#batchDelete").click(function(){
//alert(22)
var ids = "";
$("[name=ids]:checked").each(function(){
ids += ","+this.value;
})
//alert(ids)
ids = ids.substring(1);//去掉前面的一个逗号
//alert(ids.substring(1));
//传入后台进行删除
location.href="${pageContext.request.contextPath}/user?method=batchDelete&ids="+ids;
})
})
</script>
UserServlet.java
//批量删除 batchDelete
public String batchDelete(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
String ids = request.getParameter("ids");
System.out.println(ids);
us.batchDelete(ids);
//重定向
response.sendRedirect(request.getContextPath()+"/user?method=findUserByPageBean&pageNumber=1");
return null;
}
UserService.java
//批量删除
void batchDelete(String ids) throws Exception;
UserServiceImpl.java
//进行批量删除
@Override
public void batchDelete(String ids) throws Exception {
ud.batchDelete(ids);
}
UserDao.java
//进行批量删除
void batchDelete(String ids)throws Exception;
UserDaoImpl.java
//进行批量删除
@Override
public void batchDelete(String ids) throws Exception {
String sql = "delete from user where uid in ("+ ids +")";
qr.update(sql);
}
五、分类分页查询
（1）导入表 (文件三) ： sql：
CREATE TABLE `category` (
`cid` INT(10) PRIMARY KEY AUTO_INCREMENT,
`cname` VARCHAR(50) NOT NULL,
`state` INT(1) DEFAULT NULL,
`order_number` INT(5) DEFAULT NULL,
`description` VARCHAR(100) DEFAULT NULL,
`create_time` DATETIME
);
INSERT INTO `category`(`cid`,`cname`,`state`,`order_number`,`description`,`create_time`) VALUES
(2,'航天系列',1,1,'卫星、航母火箭等','2021-12-25 09:53:55'),(3,'手机 平板',1,0,'各种小米系手机','2021-12-25 14:20:12'),
(4,'家电',1,2,' 电视、冰箱、洗衣机等','2021-12-25 14:20:42'),(5,'儿童玩具',1,3,'各种玩具','2021-12-25 16:38:14'),
(6,'智能产品',1,2,'','2021-12-26 14:46:27'),(7,'图书 内容',1,55,'','2021-12-25 09:53:55'),
(8,'移动电源 电池 插线板',1,33,'1','2018-12-26 14:48:16'),(9,'耳机 音响',1,34,'','2021-12-26 14:48:31'),
(10,'保护套 贴膜',1,35,'','2021-12-26 14:48:47'),(11,'线材 支架 存储卡',1,36,'','2021-12-26 14:49:04'),
(12,'箱包 服饰 鞋 眼镜',1,37,'','2021-12-26 14:49:19'),(13,'米兔 生活周边',1,38,'','2021-12-26 14:49:33');
（2）创建结构（类）
（3）根据导入的category表编写javabean
Category.java
package com.zql.pojo;
import java.io.Serializable;
/**
* author:Daniel
* version:1.0
*/
public class Category implements Serializable{
private int cid;//序号
private String cname;//类别名称
private int state;//启动状态 1 启用 0 未启用
private int order_number;//排序序号
private String description;//描述
private String create_time;//创建时间
public Category() {
super();
// TODO Auto-generated constructor stub
}
public Category(int cid, String cname, int state, int order_number, String description, String create_time) {
super();
this.cid = cid;
this.cname = cname;
this.state = state;
this.order_number = order_number;
this.description = description;
this.create_time = create_time;
}
public int getCid() {
return cid;
}
public void setCid(int cid) {
this.cid = cid;
}
public String getCname() {
return cname;
}
public void setCname(String cname) {
this.cname = cname;
}
public int getState() {
return state;
}
public void setState(int state) {
this.state = state;
}
public int getOrder_number() {
return order_number;
}
public void setOrder_number(int order_number) {
this.order_number = order_number;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public String getCreate_time() {
return create_time;
}
public void setCreate_time(String create_time) {
this.create_time = create_time;
}
@Override
public String toString() {
return "Category [cid=" + cid + ", cname=" + cname + ", state=" + state + ", order_number=" + order_number
+ ", description=" + description + ", create_time=" + create_time + "]";
}
}
(4) 起名 方法（入口）
admin/left.jsp
${pageContext.request.contextPath }/category?method=categoryByPageBean&pageNumber=1
(5) CategoryServlet.java
package com.zql.web.servlet;
import java.util.List;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import com.zql.pojo.Category;
import com.zql.pojo.User;
import com.zql.service.CategoryService;
import com.zql.service.impl.CategoryServiceImpl;
import com.zql.utils.PageBean;
/**
* author:Daniel
* version:1.0
*/
@WebServlet("/category")
public class CategoryServlet extends BaseServlet{
private CategoryService cs = new CategoryServiceImpl();
//对查询的类别进行分页
public String categoryByPageBean(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
String pageNumber = request.getParameter("pageNumber");
//创建pageBean对象
PageBean pb = new PageBean();
//设置当前页
pb.setPageNumber(Integer.parseInt(pageNumber));
//设置每页显示的条数
pb.setPageSize(5);
PageBean<Category> pageBean = cs.categoryByPageBean(pb);
//System.out.println(pageBean);
//存放到域中
request.setAttribute("pb", pageBean);
//请求转发
return "/admin/category_list.jsp";
}
//查询所有类别
public String findCategoryList(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
String parameter = request.getParameter("");
List<Category> clist = cs.findCategoryList();
//System.out.println(clist);//控制台测试查询出来了
//存放到域中
request.setAttribute("clist", clist);
return "/admin/category_list.jsp";
}
}
(6) CategoryServicejava
package com.zql.service;
import java.sql.SQLException;
import java.util.List;
import com.zql.pojo.Category;
import com.zql.utils.PageBean;
/**
* author:Daniel
* version:1.0
*/
public interface CategoryService {
//对查询的类别进行分页
PageBean<Category> categoryByPageBean(PageBean pb) throws SQLException;
//查询所有商品类别
List<Category> findCategoryList() throws SQLException;
}
(7)CategoryServiceImpl.java
package com.zql.service.impl;
import java.sql.SQLException;
import java.util.List;
import com.zql.dao.CategoryDao;
import com.zql.dao.impl.CategoryDaoImpl;
import com.zql.pojo.Category;
import com.zql.pojo.User;
import com.zql.service.CategoryService;
import com.zql.utils.PageBean;
/**
* author:Daniel
* version:1.0
*/
public class CategoryServiceImpl implements CategoryService{
private CategoryDao cd = new CategoryDaoImpl();
//对查询的类别进行分页
@Override
public PageBean<Category> categoryByPageBean(PageBean pb) throws SQLException {
List<Category> result = cd.categoryByPageBean(pb);
int count = cd.selectCategory();
pb.setResult(result);
pb.setTotalCount(count);
return pb;
}
//查询所有类别
@Override
public List<Category> findCategoryList() throws SQLException {
return cd.findCategoryList();
}
}
(8)CategoryDao.java
package com.zql.dao;
import java.sql.SQLException;
import java.util.List;
import com.zql.pojo.Category;
import com.zql.utils.PageBean;
/**
* author:Daniel
* version:1.0
*/
public interface CategoryDao {
//对查询的类别进行分页
List<Category> categoryByPageBean(PageBean pb) throws SQLException;
int selectCategory() throws SQLException;
//查询所有类别
List<Category> findCategoryList() throws SQLException;
}
(9) CategoryDaoImpl.java
package com.zql.dao.impl;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.dbutils.QueryRunner;
import org.apache.commons.dbutils.handlers.BeanListHandler;
import org.apache.commons.dbutils.handlers.ScalarHandler;
import com.zql.dao.CategoryDao;
import com.zql.pojo.Category;
import com.zql.utils.C3P0Utils;
import com.zql.utils.PageBean;
/**
* author:Daniel
* version:1.0
*/
public class CategoryDaoImpl implements CategoryDao{
private QueryRunner qr = new QueryRunner(C3P0Utils.getDataSource());
//对查询的类别进行分页
@Override
public List<Category> categoryByPageBean(PageBean pb) throws SQLException {
String sql = "select * from category limit ?,?";
Object[] params = {pb.getStartIndex(),pb.getPageSize()};
return qr.query(sql, new BeanListHandler<Category>(Category.class),params);
}
//查询总记录数
@Override
public int selectCategory() throws SQLException {
String sql = "select count(*) from category";
Long count = (Long) qr.query(sql,new ScalarHandler());
return count.intValue();
}
//查询所有类别
@Override
public List<Category> findCategoryList() throws SQLException {
String sql = "select * from category";
return qr.query(sql, new BeanListHandler<Category>(Category.class));
}
}
(10) admin/category_list.jsp<三步走>
(10.1)查询部分
<tbody>
<c:if test="${not empty pb.result }"></c:if>
<c:forEach items="${pb.result }" var="v" varStatus="vs">
<tr>
<td><input name="" type="checkbox" value="" /></td>
<td>${vs.count }</td>
<td>${v.cname }</td>
<td>
<c:if test="${v.state == 1 }">启用</c:if>
<c:if test="${v.state == 0 }">未启用</c:if>
</td>
<td>${v.order_number}</td>
<td>${v.create_time }</td>
<td>.....</td>
<td>
<a href="">修改</a>
<a href="javascript:void(0)" onclick="del()" >删除</a>
</td>
</tr>
</c:forEach>
</tbody>
(10.1)分页部分
（10.3）完整代码
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>商品分类</title>
<link href="${pageContext.request.contextPath}/admin/css/style.css" rel="stylesheet" type="text/css" />
<script type="text/javascript" src="${pageContext.request.contextPath}/js/jquery-3.3.1.js"></script>
<script type="text/javascript">
// old write
$(document).ready(function(){
$(".click").click(function(){
$(".tip").fadeIn(200);
});
$(".tiptop a").click(function(){
$(".tip").fadeOut(200);
});
$(".sure").click(function(){
$(".tip").fadeOut(100);
});
$(".cancel").click(function(){
$(".tip").fadeOut(100);
});
});
</script>
</head>
<body>
<div class="place">
<span>位置：</span>
<ul class="placeul">
<li><a href="#">分类管理</a></li>
</ul>
</div>
<div class="rightinfo">
<div class="tools">
<ul class="toolbar">
<%-- <li class="click"><span><img src="${pageContext.request.contextPath}/admin/images/t02.png" /></span>修改</li>
<li><span><img src="${pageContext.request.contextPath}/admin/images/t04.png" /></span>统计</li> --%>
<li style="cursor: pointer;" id="add_category"><span><img src="${pageContext.request.contextPath}/admin/images/t01.png" /></span>添加类别</li>
<li style="cursor: pointer;" id=""><span><img src="${pageContext.request.contextPath}/admin/images/t03.png" /></span>批量删除</li>
</ul>
</div>
<table class="tablelist">
<thead>
<tr>
<th><input name="" type="checkbox" value="" /></th>
<th>序号<i class="sort"><img src="${pageContext.request.contextPath}/admin/images/px.gif" /></i></th>
<th>类别名称</th>
<th>启用状态</th>
<th>排序序号</th>
<th>创建时间</th>
<th>描述</th>
<th>操作</th>
</tr>
</thead>
<tbody>
<c:if test="${not empty pb.result }"></c:if>
<c:forEach items="${pb.result }" var="v" varStatus="vs">
<tr>
<td><input name="" type="checkbox" value="" /></td>
<td>${vs.count }</td>
<td>${v.cname }</td>
<td>
<c:if test="${v.state == 1 }">启用</c:if>
<c:if test="${v.state == 0 }">未启用</c:if>
</td>
<td>${v.order_number}</td>
<td>${v.create_time }</td>
<td>.....</td>
<td>
<a href="">修改</a>
<a href="javascript:void(0)" onclick="del()" >删除</a>
</td>
</tr>
</c:forEach>
</tbody>
</table>
<div class="pagin">
<div class="message">共<i class="blue">${pb.totalCount }</i>条记录，当前显示第 <i class="blue">${pb.pageNumber } </i>页</div>
<ul class="paginList">
<li class="paginItem"><a href="${pageContext.request.contextPath }/category?method=categoryByPageBean&pageNumber=1">首页</a></li>
<li class="paginItem"><a href="${pageContext.request.contextPath }/category?method=categoryByPageBean&pageNumber=${pb.pageNumber-1}">上一页</a></li>
<li class="paginItem"><a href="${pageContext.request.contextPath }/category?method=categoryByPageBean&pageNumber=${pb.pageNumber+1}">下一页</a></li>
<li class="paginItem"><a href="${pageContext.request.contextPath }/category?method=categoryByPageBean&pageNumber=${pb.totalPage}">尾页</a></li>
</ul>
</div>
<div class="tip">
<div class="tiptop"><span>提示信息</span><a></a></div>
<div class="tipinfo">
<span><img src="images/ticon.png" /></span>
<div class="tipright">
<p>是否确认对信息的修改 ？</p>
<cite>如果是请点击确定按钮 ，否则请点取消。</cite>
</div>
</div>
<div class="tipbtn">
<input name="" type="button" class="sure" value="确定" />
<input name="" type="button" class="cancel" value="取消" />
</div>
</div>
</div>
<script type="text/javascript">
$('.tablelist tbody tr:odd').addClass('odd');
</script>
</body>
</html>
最终显示：
六、分类-添加分类
（1）跳转admin/category_add.jsp添加页面
admin/category_list.jsp
<script type="text/javascript">
$(function(){
$("#add_category").click(function(){
location.href="${pageContext.request.contextPath}/admin/category_add.jsp";
});
})
</script>
点击“添加类别”如下
（2）添加入口路径方法
admin/category_add.jsp
${pageContext.request.contextPath }/category?method=addCategory
（3）CategoryServlet.java
//添加分类
public String addCategory(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
Map<String, String[]> map = request.getParameterMap();
Category category = new Category();
BeanUtils.populate(category, map);
cs.addCategory(category);
response.sendRedirect(request.getContextPath()+"/category?method=categoryByPageBean&pageNumber=1");
return null;
}
（4）CategoryService.java
//添加类别
void addCategory(Category category) throws SQLException;
（5）CategoryServiceImpl.java
//添加分类
@Override
public void addCategory(Category category) throws SQLException {
cd.addCategory(category);
}
（6）CategoryDao.java
//添加分类
void addCategory(Category category) throws SQLException;
（7）CategoryDaoImpl.java
//添加分类
@Override
public void addCategory(Category category) throws SQLException {
String sql = "insert into category values(?,?,?,?,?,?)";
Object[] params = {null,category.getCname(),category.getState(),category.getOrder_number(),category.getDescription(),category.getCreate_time()};
qr.update(sql, params);
}
添加成功显示 ：http://localhost:8080/xiaomi/admin/main.jsp
七、分类–修改分类
7.1 跳转并回显
（1）在admin/category_list.jsp中添加
${pageContext.request.contextPath}/category?method=toUpdateCategory&cid=${v.cid}
（2）CategoryServlet.java
//跳转修改页面并回显toUpdateCategory
public String toUpdateCategory(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
String cid = request.getParameter("cid");
//业务处理
Category category = cs.toUpdateCategory(cid);
//存放到域中
request.setAttribute("category", category);
return "/admin/category_update.jsp";
}
(3)CategoryService.java
//跳转修改页面并回显
Category toUpdateCategory(String cid) throws SQLException;
(4)CategoryServiceImpl.java
//跳转修改页面并回显
@Override
public Category toUpdateCategory(String cid) throws SQLException{
return cd.toUpdateCategory(cid);
}
(5)CategoryDao.java
//跳转修改页面并回显
Category toUpdateCategory(String cid) throws SQLException;
(6)CategoryDaoImp.java
//跳转修改页面并回显
@Override
public Category toUpdateCategory(String cid) throws SQLException {
String sql = "select * from category where cid = ?";
return qr.query(sql, new BeanHandler<Category>(Category.class),cid);
}
(7)admin/category_update.jsp
完整代码：
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<%@taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%@taglib prefix="fmt" uri="http://java.sun.com/jsp/jstl/fmt" %>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>添加类别</title>
<link href="${pageContext.request.contextPath}/admin/css/style.css" rel="stylesheet" type="text/css" />
<script language="javascript" type="text/javascript" src="${pageContext.request.contextPath}/admin/js/My97DatePicker/WdatePicker.js"></script>
</head>
<body>
<div class="place">
<span>位置：</span>
<ul class="placeul">
<li><a href="#">修改类别</a></li>
</ul>
</div>
<div class="formbody">
<div class="formtitle"><span>类别信息</span></div>
<form action="" method="post">
<!-- 获取ID值 -->
<input name="cid" type="hidden" value="${category.cid }" />
<ul class="forminfo">
<li><label>类别名称</label><input name="cname" type="text" value="${category.cname }" class="dfinput" /><i>类别名称不能超过30个字符</i></li>
<li><label>是否启用</label>
<cite>
<input name="status" type="radio" value="1" <c:if test="${category.state == 1 }">checked</c:if>/>是
<input name="status" type="radio" value="0" <c:if test="${category.state == 0 }">checked</c:if>/>否
</cite>
</li>
<li><label>排序序号</label>
<input name="order_number" type="text" value="${category.order_number }" class="dfinput" /><i>输入数字，越大越靠后排列</i>
</li>
<li><label>类别描述</label>
<textarea name="description" cols="" rows="" class="textinput" >${category.description }</textarea>
</li>
<li><label>创建时间</label>
<input class="Wdate" style="width: 345px;height: 32px;line-height: 32px;" onClick="WdatePicker({el:this,dateFmt:'yyyy-MM-dd HH:mm:ss'})"
name="create_time" type="text" class="dfinput" value="${category.create_time }" />
</li>
<li><label> </label><input type="submit" class="btn" value="确认修改"/></li>
</ul>
</form>
</div>
</body>
</html>
点击修改前：
点击修改后（回显）：
7.2 修改并保存
（1）在admin/category_update.jsp添加
${pageContext.request.contextPath}/category?method=toUpdate
（2）CategoryServlet.java
//修改后的保存toUpdate
public String toUpdate(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
Map<String, String[]> map = request.getParameterMap();
Category category = new Category();
BeanUtils.populate(category, map);
cs.toUpdate(category);
response.sendRedirect(request.getContextPath()+"/category?method=categoryByPageBean&pageNumber=1");
return null;
}
(3)CategoryService.java
//修改后的保存toUpdate
void toUpdate(Category category) throws SQLException;
(4)CategoryServiceImpl.java
//修改后的保存toUpdate
@Override
public void toUpdate(Category category) throws SQLException {
cd.toUpdate(category);
}
(5)CategoryDao.java
//修改后的保存
void toUpdate(Category category) throws SQLException;
(6)CategoryDaoImp.java
//去修改后的保存
@Override
public void toUpdate(Category category) throws SQLException {
String sql = "update category set cname=?,state=?,order_number=?,description=?,create_time=? where cid=?";
Object[] param = {category.getCname(),category.getState(),category.getOrder_number(),
category.getDescription(),category.getCreate_time(),category.getCid()};
qr.update(sql,param);
}
(7)最终显示
修改前：
修改后：
八、分类–分类删除
需求：删除上面修改的一条记录
(1) 在admin/category_list.jsp中添加如下，根据cid删除
（2）友好提示对接后端
admin/category_list.jsp
/* 通过cid删除Category */
function del(cid){
if(confirm("兄台,您确定删除么？")){
location.href="${pageContext.request.contextPath}/category?method=delCategoryByCid&cid="+cid;
}
}
（3）CategoryServlet.java
//通过cid删除Category
public String delCategoryByCid(HttpServletRequest request, HttpServletResponse response)throws Exception {
//处理数据
String cid = request.getParameter("cid");
cs.delCategoryByCid(cid);
response.sendRedirect(request.getContextPath()+"/category?method=categoryByPageBean&pageNumber=1");
return null;
}
(4)CategoryService.java
//通过cid删除Category
void delCategoryByCid(String cid) throws SQLException;
(5)CategoryServiceImpl.java
//通过cid删除Category
@Override
public void delCategoryByCid(String cid) throws SQLException {
cd.delCategoryByCid(cid);
}
(6)CategoryDao.java
//通过cid删除Category
void delCategoryByCid(String cid) throws SQLException;
(7)CategoryDaoImpl.java
//通过cid删除Category
@Override
public void delCategoryByCid(String cid) throws SQLException {
String sql = "delete from category where cid=?";
qr.update(sql,cid);
}
最终显示
删除前：显示17条记录
删除后：
