【JAVAEE】Strust2案例2-实现用户注册与登陆

本文最后更新于 1520 天前，其中的信息可能已经有所发展或是发生改变。

1.模型组件的创建
实现数据库连接和关闭的工具类。
com.db_util/DBConnection.java
[sourcecode language=”java” title=”com.db_util/DBConnection.java”]
package com.db_util;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBConnection {
private static String driverName="com.mysql.jdbc.Driver";
private static String userName="root";
private static String userPwd="123456";
private static String dbName="user";
public static Connection getDBConnection(){
String url1="jdbc:mysql://localhost/"+dbName;
String url2="?user="+userName+"&password="+userPwd;
String url3="&useUnicode=true&characterEncoding=utf-8";
String url=url1+url2+url3;
Connection con=null;
try {
Class.forName(driverName);
con=DriverManager.getConnection(url);
} catch (Exception e) {
e.printStackTrace();
}
return con;
}

public static void closeDB(Connection con,PreparedStatement pstm,ResultSet rs){
if(rs!=null)
try {
rs.close();
} catch (SQLException e) {
e.printStackTrace();
}
if(pstm!=null)
try {
pstm.close();
} catch (SQLException e) {
e.printStackTrace();
}
if(con!=null)
try {
con.close();
} catch (SQLException e) {
e.printStackTrace();
}
}
}[/sourcecode]
实现数据库操作的DAO业务类。
com.dao.user/UserDao.java
[sourcecode language=”java” title=”com.dao.user/UserDao.java”]
package com.dao.user;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;

import com.db_util.DBConnection;
import com.model.user.EndUser;

public class UserDao {
// 想数据库中插入一个用户
public int save(EndUser user) {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
con = DBConnection.getDBConnection();
int row = 0;
String sql = "insert into user(userName,userPassword,userRealName) values(?,?,?)";
try {
pstmt = con.prepareStatement(sql);
pstmt.setString(1, user.getUserName());
pstmt.setString(2, user.getUserPassword());
pstmt.setString(3, user.getUserRealName());
row = pstmt.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
DBConnection.closeDB(con, pstmt, rs);
}
return row;
}

// 从数据库中删除一个用户
public int delete(EndUser user) {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
int row = 0;
con = DBConnection.getDBConnection();
String sql = "delete from user where username=? ";
try {
pstmt = con.prepareStatement(sql);
pstmt.setString(1, user.getUserName());
row = pstmt.executeUpdate();
} catch (Exception e) {
e.printStackTrace();
} finally {
DBConnection.closeDB(con, pstmt, rs);
}
return row;
}

// 修改用户值
public int update(EndUser user, String newPassword) {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
int row = 0;
con = DBConnection.getDBConnection();
String sql = "update from user set userpassword=? where username=? and userpassword=? ";
try {
pstmt = con.prepareStatement(sql);
pstmt.setString(1, newPassword);
pstmt.setString(2, user.getUserName());
pstmt.setString(3, user.getUserPassword());
row = pstmt.executeUpdate();
} catch (SQLException e) {
e.printStackTrace();
} finally {
DBConnection.closeDB(con, pstmt, rs);
}
return row;
}

// 从数据库中查找一个用户
public EndUser find(EndUser user) {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
con = DBConnection.getDBConnection();
EndUser user2 = null;
String sql = "select id,username,userpassword,userrealname from user where username=? and userpassword=? ";
try {
pstmt = con.prepareStatement(sql);
pstmt.setString(1, user.getUserName());
pstmt.setString(2, user.getUserPassword());
rs = pstmt.executeQuery();
if (rs.next()) {
user2 = new EndUser();
user2.setUserId(rs.getInt("id"));
user2.setUserName(rs.getString("username"));
user2.setUserPassword(rs.getString("userpassword"));
user2.setUserRealName(rs.getString("userrealname"));
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBConnection.closeDB(con, pstmt, rs);
}
return user2;
}

// 列出所有用户
public List<EndUser> findAll() {
Connection con = null;
PreparedStatement pstmt = null;
ResultSet rs = null;
List<EndUser> users = new ArrayList<EndUser>();
con = DBConnection.getDBConnection();
String sql = "select id,userName,userPassword,userRealName from user ";
try {
pstmt = con.prepareStatement(sql);
rs = pstmt.executeQuery();
while (rs.next()) {
EndUser user = new EndUser();
user.setUserId(rs.getInt("id"));
user.setUserName(rs.getString("username"));
user.setUserPassword(rs.getString("userpassword"));
user.setUserRealName("userRealName");
users.add(user);
}
} catch (Exception e) {
e.printStackTrace();
} finally {
DBConnection.closeDB(con, pstmt, rs);
}
return users;
}
}[/sourcecode]
用户JavaBean类，用户描述用户信息及相关的处理方法。
com.model.user/EndUser.java
[sourcecode language=”java” title=”com.model.user/EndUser.java”]
package com.model.user;

public class EndUser {
private Integer userId;
private String userName;
private String userPassword;
private String userRealName;

public EndUser() {}

public EndUser(Integer userId, String userName, String userPassword,String userRealName) {
this.userId = userId;
this.userName = userName;
this.userPassword = userPassword;
this.userRealName = userRealName;
}

public Integer getUserId() {
return userId;
}

public void setUserId(Integer userId) {
this.userId = userId;
}

public String getUserName() {
return userName;
}

public void setUserName(String userName) {
this.userName = userName;
}

public String getUserPassword() {
return userPassword;
}

public void setUserPassword(String userPassword) {
this.userPassword = userPassword;
}

public String getUserRealName() {
return userRealName;
}

public void setUserRealName(String userRealName) {
this.userRealName = userRealName;
}
}[/sourcecode]
2.创建Action类包含用户登陆和注册方法。
com.action.user/UserAction.java
[sourcecode language=”java” title=”com.action.user/UserAction.java”]
package com.action.user;
import com.dao.user.UserDao;
import com.model.user.EndUser;

public class UserAction {
private EndUser user;
private UserDao userDao = new UserDao();

// 用户登录Action方法
public String userLogin() throws Exception {
String forward = null;
EndUser user2 = userDao.find(user);
if (user2 != null) {
forward = "success"; //登录成功标记值
user.setUserRealName(user2.getUserRealName());
} else {
forward = "failure";//登录失败标记值
}
return forward;
}

// 用户注册Action方法
public String userRegister() throws Exception {
String forward ="error"; //数据库存数据时出错标记值
int flag = 0;
EndUser user2=(userDao.find(user));
if (user2!=null && (user2.getUserName().trim()).equals((user.getUserName()).trim())) {
forward = "error_user"; //用户名已被占用标记标记值
} else {
flag = userDao.save(user);
if (flag == 1) {
forward = "success"; //成功注册标记值
}
}
return forward;
}

public EndUser getUser() {
return user;
}

public void setUser(EndUser user) {
this.user = user;
}
}[/sourcecode]
3.创建视频组件。
登陆页面
user/login.jsp
[sourcecode language=”html” title=”user/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>登陆页面</title>
</head>
<body>
<form method="post" action="/benzhu2/user/logincheck">
<table>
<tr>
<th colspan="2">用户登录</th>
</tr>
<tr>
<td align="right">用户名：</td>
<td><input type="text" name="user.userName" /></td>
</tr>
<tr>
<td align="right">密码：</td>
<td><input type="password" name="user.userPassword" /></td>
</tr>
<tr>
<td align="left"><input type="submit" value="登录" /></td>
<td>未注册者，请先注册，单击 <a href="/benzhu2/user/register.jsp">注册</a></td>
</tr>

</table>
</form>
<br>
</body>
</html>[/sourcecode]
登陆成功页面
user/login_success.java
[sourcecode language=”html” title=”user/login_success.java”]
<%@ 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>登陆成功</title>
</head>
<body>
欢迎你，${user.userRealName} ，你登入成功！！<br>
进入主页面，请点击<a href="/benzhu2/index.jsp">主页面</a>
</body>
</html>[/sourcecode]
登陆失败页面
user/login_failure.jsp
[sourcecode language=”html” title=”user/login_failure.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>登陆失败</title>
</head>
<body>
<h2 align="center"><font color="red">
对不起，你填写的账号和密码不正确！请</font>
<a href="/benzhu2/user/login.jsp">重新登录</a>!
</h2>
</body>
</html>[/sourcecode]
注册页面
user/reister.jsp
[sourcecode language=”html” title=”user/reister.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>注册页面</title>
<script type="text/javascript">
function isValidate(form) {
var username=document.getElementById("username").value;
var userpass=document.getElementById("userpassword").value;
var userpass1=document.getElementById("userpass1").value;
if (userpass != userpass1) {
alert("两次密码输入不一致，请重新输入！");
return false;
}else if (userpass.length<=0 ||username.length<=0 ) {
alert("用户名以及密码不能为空，请重新输入！");
return false;
}else{
return true;
}
}
</script>
</head>

<body>
<h3 align="left">欢迎注册我们的系统，请认真填写您的信息</h3>
<form name="register" action="/benzhu2/user/register" method="post" onsubmit="return isValidate()">
<table>
<tr>
<td align="right">账户名：</td>
<td><input type="text" name="user.userName" id="username"></td>
</tr>
<tr>
<td align="right">为您的账户设置密码：</td>
<td><input type="password" name="user.userPassword" id="userpassword"></td>
</tr>

<tr>
<td align="right">再次确认您的密码：</td>
<td><input type="password" name="userpass1" id="userpass1"></td>
<td></td>
</tr>
<tr>
<td align="right">真实姓名：</td>
<td><input type="text" name="user.userRealName" id="userrealname"></td>
<td></td>
</tr>
<tr>
<td align="right"><input type="submit" value="提交"></td>
<td colspan="2"><input type="reset" value="重新填写"></td>
</tr>
</table>
</form>

</body>
</html>[/sourcecode]
注册成功页面
user/register_success.jsp
[sourcecode language=”html” title=”user/register_success.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>注册成功！</title>
</head>
<body>
<h3>
恭喜，${user.userRealName},你成功注册了我们的管理系统！点此
<a href="/benzhu2/user/login.jsp">登录</a>
</h3>
</body>
</html>[/sourcecode]
注册失败页面1
user/register_failure_user.jsp
[sourcecode language=”html” title=”user/register_failure_user.jsp”]
<%@ page language="java" contentType="text/html; charset=utf-8"
pageEncoding="utf-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>注册失败！</title>
</head>
<body>
<h3>对不起，此用户名：${user.userName}已被占用，请重新注册。</h3> <br>
<h2>请点击<a href="/benzhu2/user/register.jsp">注册</a></h2>
</body>
</html>[/sourcecode]
注册失败页面2
user/register_failure.jsp
[sourcecode language=”html” title=”user/register_failure.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>注册失败！</title>
</head>
<body>
<h3>对不起，数据库出错，没有正确保存，请重新注册。</h3> <br>
<h2>请点击<a href="/benzhu2/user/register.jsp">注册</a></h2>
</body>
</html>[/sourcecode]
系统主页面
index.jsp
[sourcecode language=”html” title=”index.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>主页面</title>
</head>
<body>
主页面
</body>
</html>[/sourcecode]
4.修改web.xml文件。
web.xml
[sourcecode language=”xml” title=”web.xml”]
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd" id="WebApp_ID" version="3.1">
<display-name>benzhu2</display-name>
<filter>
<filter-name>struts2</filter-name>
<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>struts2</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<welcome-file-list>
<welcome-file>index.jsp</welcome-file>
</welcome-file-list>
</web-app>[/sourcecode]
5.配置Action形成单独的配置文件。
struts-user.xml
[sourcecode language=”xml” title=”struts-user.xml”]
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<action name="register" class="com.action.user.UserAction" method="userRegister" >
<result name="success">/user/register_success.jsp</result>
<result name="error">/user/register_failure.jsp</result>
<result name="error_user">/user/register_failure_user.jsp</result>
</action>

<action name="logincheck" class="com.action.user.UserAction" method="userLogin">
<result name="failure">/user/login_failure.jsp</result>
<result name="success">/user/login_success.jsp</result>
</action>

</package>

</struts>[/sourcecode]
struts.xml
[sourcecode language=”xml” title=”struts.xml”]
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
"http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
<include file="struts-user.xml" />
</struts>[/sourcecode]
6.导入Struts2的必须jar包。
下载文件放入WebContent/WEB-INF/lib文件下并设置好jar包导入
本地下载
注意：此版本为Strut-2.3.24，不支持JDK9.0，支持1.8。
eclipse项目下载: 本地下载

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