Struts2注解+JDBC+MySQL小项目应用
很简易的Struts2，用JDBC连接MySQL数据库。用于学习Struts2注解和JDBC基础。
一、创建数据库。小哆安装的MySQL数据库
/*
Navicat MySQL Data Transfer
Source Server : myStruts
Source Server Version : 50142
Source Host : localhost:3308
Source Database : myStrutsDB
Target Server Type : MYSQL
Target Server Version : 50142
File Encoding : 65001
Date: 2012-01-01 10:30:30
*/
SET FOREIGN_KEY_CHECKS=0;
-- ----------------------------
-- Table structure for `user`
-- ----------------------------
DROP TABLE IF EXISTS `user`;
CREATE TABLE `user` (
`userName` varchar(20) NOT NULL,
`passWord` varchar(20) NOT NULL,
`registeredTime` char(12) NOT NULL,
PRIMARY KEY (`userName`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- ----------------------------
-- Records of user
-- ----------------------------
INSERT INTO `user` VALUES ('111111', '111111', '201112311022');
INSERT INTO `user` VALUES ('admin', 'admin', '201112311026');
二、创建Struts2 Project
New – Dynamic Web Project<myStruts2>
导入jar包
1、项目中各部分介绍
1.1 WEBContent包含：
1.1.1 login.jsp(可根据url直接登录)
1.1.2 WEB-INF中： 1.1.2.1 web.xml
1.1.2.2 success.jsp
1.1.2.3 failure.jsp
PS:一般web应用将jsp放在WEB-INF文件夹下的用意：WEB-INF下面的文件会受到保护，通过浏览器无法直接访问，必须通过servlet，action跳转访问
1.2. src包含:
1.2.1 action包：所有Action类，必须实现getter/setter，与jsp直接交互
1.2.2 dao包：连接数据库的类
1.2.3 dmo包：实体类，与数据表字段对应
1.2.4 impl包：业务操作的实现类
2、编写web.xml
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5"> <display-name>myStruts2</display-name> <!-- 用户键入的URL不包含action名称、JSP页面或其他资源，依次寻找文件 --> <welcome-file-list> <welcome-file>login.jsp</welcome-file> </welcome-file-list> <filter> <!--过滤器名字 --> <filter-name>struts2</filter-name> <!-- struts2过滤器支持的StrutsPrepareFilter类 --> <filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class> <!-- 添加使用注解必须的参数,指定查找Action类的路径 --> <!-- <init-param> <param-name>actionPackages</param-name> <param-value>action</param-value> </init-param> --> </filter> <filter-mapping> <!--过滤器拦截名字 --> <filter-name>struts2</filter-name> <!--过滤器拦截文件路径名字 --> <!-- 通配符/*表示拦截所有HTTP请求 --> <url-pattern>/*</url-pattern> </filter-mapping> </web-app>
3、编写login.jsp
<%@ page language="java" contentType="text/html; charset=utf-8" pageEncoding="utf-8"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>login</title> </head> <body> <form action="register!register.action"> <table> <tr> <td>用户名:</td> <td colspan=2><input type="text" name="userName" /></td> </tr> <tr> <td>密码:</td> <td colspan=2><input type="password" name="passWord" /></td> </tr> <tr> <td><input type="reset" name="reset" value="重置" /></td> <td colspan=2><input type="submit" name="register" value="注册" /></td> </tr> </table> </form> <form action="login!login.action"> <table> <tr> <td>用户名:</td> <td colspan=2><input type="text" name="userName" /></td> </tr> <tr> <td>密码:</td> <td colspan=2><input type="password" name="passWord" /></td> </tr> <tr> <td><input type="reset" name="reset" value="重置" /></td> <td colspan=2><input type="submit" name="login" value="登录" /></td> </tr> </table> </form> </body> </html>
4、创建操作结果提示JSP<success.jsp/failure.jsp>
success.jsp
<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!-- Struts2标签taglib --> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset= UTF-8"> <title> success </title> </head> <body> <!-- 用session传输数据 --> ${sessionScope.userName} <!-- 先声明taglib，value即对应传输数据，对应字段名；为接收到数据时，显示默认default --> success<h1><s:property value="resultMsg" default="未接收到信息"/></h1> </body> </html>failure.jsp<%@ page language="java" contentType="text/html; charset=UTF-8" pageEncoding="UTF-8"%> <!-- Struts2标签taglib --> <%@ taglib prefix="s" uri="/struts-tags"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset= UTF-8"> <title>failure</title> </head> <body> failure<h1><s:property value="resultMsg" default="未接收到信息"/></h1> </body> </html>
5、创建JDBC连接<dao.DBConn.java>
package dao; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; /** * * 数据库操作 * * @author 莫小哆_ly 2011-12-31 */ public class DBConn { private Connection conn; /** * 连接数据库 * @return */ public Connection getConn(){ String url = "jdbc:mysql://localhost:3308/myStrutsDB"; // 数据库地址[jdbc:mysql://<IP>:<db-port>/<db-name>] String user = "root"; // 数据库用户名 String pwd = ""; // 数据库密码 try { Class.forName("com.mysql.jdbc.Driver"); // 加载驱动 conn = DriverManager.getConnection(url, user, pwd);// 注册驱动程序 if (!conn.isClosed()) { System.out.println("连接成功"); } if (conn == null) { System.out.println("连接数据库失败，从检查后重新启动！"); } } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (SQLException e) { e.printStackTrace(); } return conn; } /** * 关闭数据库连接 */ public void closeConn(){ if(conn!=null) { try{ conn.close(); }catch(Exception e){ e.printStackTrace(); } } } }6、创建实体类<dmo.User.java>package dmo; /** * * 用户信息 * * @author 莫小哆_ly 2012-1-1 */ public class User { /** * 用户名 */ private String userName; /** * 密码 */ private String passWord; /** * 注册时间yyMMddHHmmss */ private String registeredTime; public User() { } public User(String userName,String passWord,String registeredTime) { this.userName = userName; this.passWord = passWord; this.registeredTime = registeredTime; } 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; } public String getRegisteredTime() { return registeredTime; } public void setRegisteredTime(String registeredTime) { this.registeredTime = registeredTime; } }
7、创建业务实现类，包括登录、注册、数据库操作<impl> 7.1 impl. InsertConOpera.java(实现insert操作)package impl; import java.sql.Connection; import java.sql.SQLException; import java.sql.Statement; import java.text.SimpleDateFormat; import java.util.Date; import dao.DBConn; /** * * 本页代码包含 【insert】功能 * * @author 莫小哆_ly 2011-12-31 */ public class InsertConOpera { //注册时间yyMMddHHmmss private String registeredTime; /** * 用户注册功能 * @param userName * @param passWord */ public int save(String userName, String passWord) { int count = 0; try { DBConn db = new DBConn(); Connection conn = db.getConn(); // 执行静态SQL语句 Statement stmt = conn.createStatement(); //生成注册时间 Date now = new Date(); SimpleDateFormat format = new SimpleDateFormat("yyMMddHHmmss"); registeredTime = format.format(now); String sql0 = "INSERT INTO user(userName,passWord,registeredTime) " + " VALUES (" + "'" + userName + "','" + passWord + "','" + registeredTime + "')"; count = stmt.executeUpdate(sql0); if (stmt != null) { // 关闭声明 try { stmt.close(); } catch (SQLException e) { e.printStackTrace(); } } if (conn != null) { // 关闭连接对象 try { conn.close(); } catch (SQLException e) { e.printStackTrace(); } } db.closeConn(); } catch (SQLException e) { e.printStackTrace(); } return count; } }
7.2 impl. SelectConOper.java (实现select操作)
package impl; import java.sql.Connection; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import dao.DBConn; /** * * 本页代码包含 【select】功能 * * @author 莫小哆_ly 2012-1-1 */ public class SelectConOper { /** * 注册时检测功能 * @param userName * @return */ public int select(String userName) { int count=0; try { DBConn db = new DBConn(); Connection conn = db.getConn(); Statement stmt = conn.createStatement() ; String sq20 = "SELECT count(*) FROM user WHERE userName = " + "'" + userName + "'"; //执行给定的 SQL 语句，该语句返回单个 ResultSet对象 ResultSet rs = stmt.executeQuery(sq20) ; while(rs.next()){ count = rs.getInt(1); } if(rs != null){ // 关闭记录集 try{ rs.close() ; }catch(SQLException e){ e.printStackTrace() ; } } if(stmt != null){ // 关闭声明 try{ stmt.close() ; }catch(SQLException e){ e.printStackTrace() ; } } if(conn != null){ // 关闭连接对象 try{ conn.close() ; }catch(SQLException e){ e.printStackTrace() ; } } db.closeConn(); } catch (SQLException e) { e.printStackTrace(); } return count; } /** * 静态SQL语句 * @param userName * @param passWord * @return */ public int selectStatement(String userName,String passWord) { int count=0; try { DBConn db = new DBConn(); Connection conn = db.getConn(); Statement stmt = conn.createStatement() ; String sq20 = "SELECT count(*) FROM user WHERE userName = " + "'" + userName + "' and userName = '" + passWord + "'"; ResultSet rs = stmt.executeQuery(sq20) ; while(rs.next()){ count = rs.getInt(1); } if(rs != null){ // 关闭记录集 try{ rs.close() ; }catch(SQLException e){ e.printStackTrace() ; } } if(stmt != null){ // 关闭声明 try{ stmt.close() ; }catch(SQLException e){ e.printStackTrace() ; } } if(conn != null){ // 关闭连接对象 try{ conn.close() ; }catch(SQLException e){ e.printStackTrace() ; } } db.closeConn(); } catch (SQLException e) { e.printStackTrace(); } return count; } /** * 动态SQL语句 * @param userName * @param passWord * @return */ public int selectPreparedStatement(String userName,String passWord) { int count=0; try { DBConn db = new DBConn(); Connection conn = db.getConn(); String sq30 = "SELECT count(*) FROM user WHERE userName = ? and passWord = ?"; PreparedStatement pstmt = conn.prepareStatement(sq30); pstmt.setString(1,userName); pstmt.setString(2,passWord); ResultSet rs = pstmt.executeQuery() ; while(rs.next()){ count = rs.getInt(1); } if(rs != null){ // 关闭记录集 try{ rs.close() ; }catch(SQLException e){ e.printStackTrace() ; } } if(pstmt != null){ // 关闭声明 try{ pstmt.close() ; }catch(SQLException e){ e.printStackTrace() ; } } if(conn != null){ // 关闭连接对象 try{ conn.close() ; }catch(SQLException e){ e.printStackTrace() ; } } } catch (SQLException e) { e.printStackTrace(); } return count; } }
此处动态SQL和静态SQL二选其一即可。7.3 impl.RegisterImpl.java (实现注册相关业务操作)
package impl; /** * * 实现注册相关业务 * * @author 莫小哆_ly 2012-1-1 */ public class RegisterImpl { SelectConOper selectConn = new SelectConOper(); InsertConOpera insertConn = new InsertConOpera(); //校验业务,select public int findByUserName(String userName) { int count = selectConn.select(userName); return count; } //注册业务，insert public int register(String userName, String passWord) { int count = insertConn.save(userName,passWord); return count; } }
7.4 impl. LoginImpl.java (实现insert操作)
package impl; import dmo.User; /** * * 实现登录相关业务 * * @author 莫小哆_ly 2012-1-1 */ public class LoginImpl { SelectConOper selectConn = new SelectConOper(); //登录业务，select public int login(User user) { int count = selectConn.selectStatement(user.getUserName(), user.getPassWord()); return count; } }
8、编写Action类，与jsp交互<action.LoginAction.ava>package action; import java.util.Map; import org.apache.struts2.convention.annotation.Action; import org.apache.struts2.convention.annotation.Namespace; import org.apache.struts2.convention.annotation.Result; import org.apache.struts2.convention.annotation.Results; import impl.RegisterImpl; import impl.SelectConOper; import com.opensymphony.xwork2.ActionContext; import com.opensymphony.xwork2.ActionSupport; @Namespace("") @Results({ @Result(name = "loginSuccess", location = "/WEB-INF/success.jsp"), @Result(name = "loginFailure", location = "/WEB-INF/failure.jsp"), @Result(name = "checkSuccess", location = "/WEB-INF/success.jsp"), @Result(name = "checkFailure", location = "/WEB-INF/failure.jsp") }) public class LoginAction extends ActionSupport { private static final long serialVersionUID = 1L; private String userName; private String passWord; private String resultMsg; private int resultInt; RegisterImpl regImpl = new RegisterImpl(); // 对应的jsp: // Namespace/类名!方法名.action // <form action="action/login!login.action"> // Action!方法名.action // <form action="login!login.action"> // 提交注册 @Action("register") public String register() { // 验证用户名是否重复 resultInt = regImpl.findByUserName(userName); if (resultInt != 0) { resultMsg = "用户名已被使用，请重新输入"; return "registerFailure"; } else { resultInt = regImpl.register(userName, passWord); if (1 == resultInt) { // 1. 将用户信息保存到Session中。 Map<String, Object> session = ActionContext.getContext().getSession(); session.put("userName", userName); session.put("passWord", passWord); // 2. taglib标识传递 resultMsg = "注册成功"; return "registerSuccess"; } else { resultMsg = "注册失败"; return "registerFailure"; } } } // 登录 @Action("login") public String login() { resultMsg = null; // 对用户的输入格式进行验证//应定义在jsp页面javScript if ("".equals(userName) || userName == null) { resultMsg = "用户名不能为空"; return "checkFailure"; } else if ("".equals(passWord) || passWord == null) { resultMsg = "密码不能为空"; return "checkFailure"; } else { if (passWord.length() < 4 || passWord.length() > 10) { resultMsg = "密码必须在4到10之间"; return "checkFailure"; } } // 数据库查询，根据用户输入与数据库中数据匹配情况 SelectConOper selectConOpe = new SelectConOper(); int resultInt = selectConOpe.selectStatement(userName, passWord); // int resultInt = // selectConOpe.selectPreparedStatement(userName,passWord); if (1 == resultInt) { resultMsg = "登录成功"; return "loginSuccess"; } else { resultMsg = "登录失败"; return "loginFailure"; } } 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; } public String getResultMsg() { return resultMsg; } public void setResultMsg(String resultMsg) { this.resultMsg = resultMsg; } }
这样，一个很简单的Struts2注解的WEB项目，就完成了。
另外，小哆在安装MySQL时，遇到了不大不小的麻烦，安装总是异常，当时就选了一个文档看了看。
百度文库MYSQL 详细安装图解
链接http://wenku.baidu.com/view/b7dbf904e87101f69e3195a4.html
我还特意追了下文档源头
百度文库mysql5.1安装图解(整理)
链接如下： http://wenku.baidu.com/view/4de81840be1e650e52ea99ef.html
源码下载： http://download.csdn.net/detail/sdsky1987/4024192