struts2编写简单登录注册

第一步：配置struts2，包括导入jar包，配置web.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>
	<constant value="false" name="struts.enable.DynamicMethodInvocation"/>
        <constant value="true" name="struts.devMode"/>
	<package name="default" namespace="/" extends="struts-default">
		<action name="LoginAction" method="login" class="com.xatu.LoginAction">
			<result>/success.jsp</result>
			<result name="input">/register.jsp</result>
		</action>
		<action name="RegisterAction" method="register" class="com.xatu.RegisterAction">
			<result>/relogin.jsp</result>
			<result name="input">/register.jsp</result>
		</action>
	</package>
</struts>

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.0" 
	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_3_0.xsd">
  <display-name></display-name>
  <filter>
    <filter-name>Login</filter-name>
	<filter-class>org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>Login</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>	
  <welcome-file-list>
    <welcome-file>login.jsp</welcome-file>
  </welcome-file-list>
</web-app>

第二部：各部分代码实现

①数据库连接

package com.db;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

public class Database {
	private String dbDriver = "com.mysql.jdbc.Driver";
	//数据库名struts2，表名user
	private String dbUrl = "jdbc:mysql://localhost:3306/struts2?useUnicode=true&characterEncoding=utf8";
	private String dbUser="root";  
	private String dbPass="mysql";
	private Connection con;
	
	public Connection getcon(){
		try {
			Class.forName(dbDriver);
			con = DriverManager.getConnection(dbUrl,dbUser,dbPass);
			
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} 
		return con;
	}
}

②javabean

package com.po;

public class User {
	
	private String username;
	private String password;
	
	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;
	}
	
	
}

③实现登录注册的action类

package com.xatu;

import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import com.db.Database;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.po.User;

@SuppressWarnings("serial")
public class RegisterAction extends ActionSupport implements ModelDriven<User>{
	private User user = new User();
	
	public String register(){
		try {
			Connection con = new Database().getcon();
			Statement st = con.createStatement();
			String sql = "insert into user values ('"+user.getUsername()+"','"+user.getPassword()+"')";
			int i = st.executeUpdate(sql);
			if(i>0){
				return SUCCESS;
			}else{
				return INPUT;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}
	@Override
	public User getModel() {
		// TODO Auto-generated method stub
		return user;
	}
}

package com.xatu;

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

import com.db.Database;
import com.opensymphony.xwork2.ActionSupport;
import com.opensymphony.xwork2.ModelDriven;
import com.po.User;

@SuppressWarnings("serial")
public class LoginAction extends ActionSupport implements ModelDriven<User>{
	
	private User user = new User();
	
	public String login(){
		try {
			Connection con = new Database().getcon();
			Statement st = con.createStatement();
			String sql = "select * from user";
			ResultSet rs = st.executeQuery(sql);
			boolean f = true;
			while(rs.next()){
				String username = rs.getString(1);
				String password = rs.getString(2);
				if(user.getUsername().equals(username) && user.getPassword().equals(password)){
					f = false;
					return SUCCESS;
				}
			}
			if(f = true){
				return INPUT;
			}
		} catch (SQLException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return null;
	}

	@Override
	public User getModel() {
		return user;
	}
}

第三部分：jsp页面

<%@ page language="java" import="java.util.*,com.po.User" pageEncoding="utf-8"%>
<%
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>注册页面</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <form action="RegisterAction" method="post">
    	用户名:<input type="text" name="username"><br>
    	密    码:<input type="password" name="password"><br>
    	<input type="submit" value="注册">
    </form>
  </body>
</html>

<%@ page language="java" import="java.util.*,com.po.User" pageEncoding="utf-8"%>
<%
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>登陆成功页面</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
     	 恭喜你，${username}登录成功！
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%
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>注册成功，重新登录</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <a href="login.jsp">注册成功，点击登录！</a>
  </body>
</html>

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
<%@ 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>登录页面</title>
    
	<meta http-equiv="pragma" content="no-cache">
	<meta http-equiv="cache-control" content="no-cache">
	<meta http-equiv="expires" content="0">    
	<meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
	<meta http-equiv="description" content="This is my page">
	<!--
	<link rel="stylesheet" type="text/css" href="styles.css">
	-->

  </head>
  
  <body>
    <form action="LoginAction" method="post">
    	用户名:<input type="text" name="username"><br>
    	密    码:<input type="password" name="password"><br><s:fielderror name="username"></s:fielderror>
    	<input type="submit" value="登录" />
    </form>
  </body>
</html>

Struts2也是基于MVC设计模式的一个java框架，本次项目中也是按照MVC设计模式设计的。