运用struts2框架实现登陆注册

最新推荐文章于 2025-11-04 11:45:17 发布

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#struts #mvc #struts2.0 #myeclipse

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本文介绍了使用Struts2框架实现登陆注册功能，包括字符串到POJO的转换、国际化(i18n)、服务器端输入验证及初步的权限控制。在MyEclipse环境中配置Struts2项目，通过自定义拦截器进行权限管理，同时展示了数据库和登陆页面的实现。

刚刚学完struts2框架，趁热打铁，做了个struts2MVC小项目练练手。主要用到了struts2的机制实现了登陆注册，

1.字符串到POJO类型的转换，

2.利用i18n拦截器实现了中英文国际化，

3.利用validate拦截器框架效验实现服务器端输入验证，

4.struts2标签库以及利用自定义拦截器实现权限控制（第四条下篇博客再进行介绍）

建完项目后，要引入jar包，我们用myeclipse自带的struts2jar包就ok，右键工程->MyEclipse->Project Faset->strutr2.x 完成之后就成功导入jar包

5.国际化实现之后，有三种方式实现中英文切换，前两种太过死板，第三种最灵活（推荐使用）

1>.直接在浏览器中修改浏览器语言

2>.在代码中设置locale属性。在struts.xml中加一个静态值（此方法虽然最简便，但不是长久之计）

代码：

<constant name="struts.locale" value="zh_CN"></constant>

<span style="white-space:pre">	</span>若设置美国英文，将value值改为：en_US

3>.实现动态国际化，在页面中加入超连接的形式来实现，具体实现参见：点击打开链接

工程截图如下：

运行界面：

一、数据库介绍

	用mysql实现

	一个用户表，三个字段，

	varchar类型的userName，password

	int类型的role用来设置权限（此篇博客暂时没用到）

	数据库表截图如下：

二、首先实现登陆页面

可以用struts2框架自带的标签库来定义，我用的html标签实现的，因为要实现国际化，框架效验，以及POJO的类型转化，所以还要引入struts2的标签库。

引入库的代码为：

<%@ taglib uri="/struts-tags" prefix="s" %>

代码如下：

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%@ page import="com.user.bean.User" %>
<%
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><s:text name="title_login"></s:text></title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
  </head>
  <body>
  <div><s:fielderror /></div>
    <form action="loginAction" method="post" name="form1">
    <table align="center">
    	<tr>
    		<td><s:text name="username"></s:text></td>
    		<td><input type="text" name="user.userName"></td>
    	</tr>
    	<tr>
    		<td><s:text name="password"></s:text></td>
    		<td><input type="password" name="user.password"></td>
    	</tr>
    	<tr>
    		<%--struts标签这样写 <td colspan="2"><s:radio name="user.role" list="#{'0':'普通用户','1':'管理员'}"/></td> --%>
    		<td>普通用户：<input type="radio" name="user.role" value="0"></td>
    		<td>超级用户：<input type="radio" name="user.role" value="1"></td>
    	</tr>
    	<tr>
    		<td><input type="submit" value=<s:text name="submit"></s:text>></td>
    		<td><input type="reset" value=<s:text name="reset"></s:text>>    <input type="button" value=<s:text name="regist"></s:text> onclick="window.location.href='Page/register.jsp'"></td>
    	</tr>
    </table>
    <s:actionerror/>
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="UTF-8"%>
<%@ taglib uri="/struts-tags" prefix="s" %>
<%
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><s:text name="title_regist"></s:text></title>
    <meta http-equiv="Content-Type" content="text/html;charset=utf-8">
  </head>
  <body>
    <form action="registAction" method="post" name="form1">
    <table align="center">
    	<tr>
    		<td><s:text name="username"></s:text></td>
    		<td><input type="text" name="user.userName"></td>
    	</tr>
    	<tr>
    		<td><s:text name="password"></s:text></td>
    		<td><input type="password" name="user.password"></td>
    	</tr>
    	<tr>
    		<td>普通用户：<input type="radio" name="user.flag" value="0"></td>
    		<td>超级用户：<input type="radio" name="user.flag" value="1"> </td>
    	</tr>
    	<tr>
    		<td><input type="submit" value=<s:text name="regist"></s:text>></td>
    		<td><input type="reset" value=<s:text name="reset"></s:text>></td>
    	</tr>
    </table>
    <s:actionerror/>
    </form>
  </body>
</html>

com.user.bean包下实体类：

User.java

package com.user.bean;

public class User {
	private int role;
	private String userName;
	private String password;

	/**
	 * @return the role
	 */
	public int getRole() {
		return role;
	}
	/**
	 * @param role the role to set
	 */
	public void setRole(int role) {
		this.role = role;
	}
	/**
	 * @return the userName
	 */
	public String getUserName() {
		return userName;
	}
	/**
	 * @param userName the userName to set
	 */
	public void setUserName(String userName) {
		this.userName = userName;
	}
	/**
	 * @return the password
	 */
	public String getPassword() {
		return password;
	}
	/**
	 * @param password the password to set
	 */
	public void setPassword(String password) {
		this.password = password;
	}
	
}

com.user.action包下UserAction.java

package com.user.action;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;
import com.user.bean.User;
import com.user.dao.UserDao;
import com.user.dao.UserDaoImpl;
public class UserAction extends ActionSupport{
	private static final long serialVersionUID = 1L;
	private User user;
	private UserDao userDao = new UserDaoImpl();
	public User getUser() {
		return user;
	}
	public void setUser(User user) {
		this.user = user;
	}
	//注册
	public String regist(){
		UserDaoImpl dao = new UserDaoImpl();
		int i = dao.Register(user);
		if(i!=-1){
			return SUCCESS;
		}else{
			return ERROR;
		}
	}
	//登陆验证
	public String login(){
		User checkUser = userDao.userLogin(user.getUserName(),user.getPassword(),user.getRole());
		if(null == checkUser){
			return ERROR;
		}else{
			ActionContext.getContext().put("tip", getText("success"));
			ActionContext.getContext().put("username", user.getUserName());
			return SUCCESS;
		}
	}
	//重写validate方法，完成输入效验
	/* (non-Javadoc)
	 * @see com.opensymphony.xwork2.ActionSupport#validate()
	 */
	@Override
	public void validate() {
		//如果用户名为空或为空字符串，则添加错误信息
		if(user.getUserName() == null||user.getUserName().trim().equals("")){
			//添加表单效验错误信息
			addFieldError("username", "输入的用户名不能为空");
		}
		//如果密码为空或为空字符串，则添加错误信息
		if(user.getPassword()==null ||user.getPassword().trim().equals("")){
			addFieldError("password", "输入的密码不能为空");
		}
	}
}

com.user.dao包下

UserDao.java

package com.user.dao;

import com.user.bean.User;

public interface UserDao {
	//用户登陆 
	public User userLogin(String userName,String password,int role);
	//用户注册
	public int Register(User user);
}

UserDaoImpl.java

package com.user.dao;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import com.user.bean.User;
import com.user.util.DBConnection;

public class UserDaoImpl implements UserDao {
	@Override
	public User userLogin(String userName,String password,int role) {
		Connection conn = null;
		PreparedStatement pstmt = null;
		ResultSet rs = null;
		User user = null;
		//获得链接
		conn = DBConnection.getConn();
		//准备
		String sql_userCheck="select userName,password,role from user where userName=? and password=? and role=?";
		try {
			pstmt = conn.prepareStatement(sql_userCheck);
			pstmt.setString(1, userName);
			pstmt.setString(2, password);
			pstmt.setInt(3, role);
			rs = pstmt.executeQuery();
			if(rs.next()){
				user = new User();
				user.setUserName(rs.getString("userName"));
				user.setPassword(rs.getString("password"));
				user.setRole(rs.getInt("role"));
				System.out.println(user.getUserName());
				System.out.println(user.getPassword());
				System.out.println(user.getRole());
			}
		} catch (SQLException e) {
			System.out.println("登陆错误！");
			e.printStackTrace();
		} finally{
			DBConnection.closeConn(conn);
			DBConnection.closeStatement(pstmt);
			DBConnection.closeResult(rs);
		}
		return user;
	}

	@Override
	public int Register(User user) {
		int i=-1;
		Connection conn = null;
		PreparedStatement pstmt = null;
		try{
			//获得链接
			conn = DBConnection.getConn();
			//准备
			String sql_userCheck="INSERT INTO user (user.userName,user.password,user.flag) VALUES(?,?,?)";
			pstmt = conn.prepareStatement(sql_userCheck);
			pstmt.setString(1, user.getUserName());
			pstmt.setString(2, user.getPassword());
			pstmt.setInt(3, user.getRole());
			i = pstmt.executeUpdate();
		}catch(SQLException e){
			System.out.println("注册错误");
			e.printStackTrace();
		}finally{
			DBConnection.closeConn(conn);
			DBConnection.closeStatement(pstmt);
		}
		return i;
	}
}

com.user.util包下

DBConnection.java

package com.user.util;

import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Properties;
/**
 * 数据库连接和关闭
 * @author yl
 *
 */
public final class DBConnection {
	private static String DRIVER;
	private static String URL;
	private static String USER;
	private static String PWD;
	private static Properties pr = new Properties();
	
	static{
		try {
			pr.load(DBConnection.class.getClassLoader().getResourceAsStream("db.properties"));
			DRIVER = pr.getProperty("driver");
			URL = pr.getProperty("url");
			USER = pr.getProperty("user");
			PWD = pr.getProperty("pass");
		} catch (IOException e) {
			System.out.println("加载资源文件错误");
			e.printStackTrace();
		}
	}
	//1.注册驱动
	static{
		try {
			Class.forName(DRIVER);
		} catch (ClassNotFoundException e) {
			System.out.println("注册驱动失败！");
			e.printStackTrace();
		}
	}
	
	//2.获得连接
	public static Connection getConn(){
		Connection conn = null;
		try {
			conn = DriverManager.getConnection(URL, USER, PWD);
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			System.out.println("数据库连接失败");
			e.printStackTrace();
		}		
		return conn;
	}
	
	//3.关闭连接
	public static void closeConn(Connection conn){
		if(conn!=null){
			try {
				conn.close();
			} catch (SQLException e) {
				System.out.println("关闭连接失败");
				e.printStackTrace();
			}
		}
	}
	
	//4.关闭执行对象
	public static void closeStatement(Statement stmt){
		if(stmt!=null){
			try {
				stmt.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
	
	//5.关闭结果集
	public static void closeResult(ResultSet rs){
		if(rs!=null){
			try {
				rs.close();
			} catch (SQLException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
		}
	}
}

db.properties

driver=com.mysql.jdbc.Driver
url=jdbc\:mysql\://localhost\:3306/user_manager
user=root
pass=root

i18n_en_US.properties

userName=User Name\uFF1A
password=Password\uFF1A
title_login=Login Page
submit=Submit
reset=Reset
regist=Regist
success=Congratulations {0}\uFF0CLogin success\uFF01

i18n_zh_CN.properties

username=\u7528\u6237\u540D\uFF1A
password=\u5BC6\u7801\uFF1A
title_login=\u767B\u9646\u9875\u9762
submit=\u767B\u9646
reset=\u91CD\u7F6E
regist=\u6CE8\u518C
success=\u606D\u559C{0}\uFF0C\u767B\u9646\u6210\u529F\uFF01

struts.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd">
<struts>
	<constant name="struts.custom.i18n.resources" value="i18n"></constant>
	<constant name="struts.locale" value="zh_CN"></constant>
	<package name="userManager" extends="struts-default">
		<action name="loginAction" class="com.user.action.UserAction" method="login">
			<result name="success">/WEB-INF/Page/loginSuccess.jsp</result>
			<result name="error">/WEB-INF/Page/loginFailed.jsp</result>
			<result name="input">/Page/login.jsp</result>
		</action>
		<action name="registAction" class="com.user.action.UserAction" method="regist">
			<result name="success">/Page/login.jsp</result>
			<result name="error">/Page/register.jsp</result>
			<result name="input">/Page/register.jsp</result>
		</action>
	</package>
</struts>