struts2简单登录例子

迈不过友情╰ 2022-05-19 07:24 221阅读 0赞

1、建立javaWeb工程struts2test1

2、导入struts2的9个基本jar包，建立path

3、在WebRoot>WEB-INF下新建web.xml

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
     "http://java.sun.com/dtd/web-app_2_3.dtd">
    
    <web-app>
      <filter>
        <filter-name>struts2</filter-name>
        <filter-class>
        	org.apache.struts2.dispatcher.FilterDispatcher
        </filter-class>
      </filter>
      <filter-mapping>
        <filter-name>struts2</filter-name>
        <url-pattern>/*</url-pattern>
      </filter-mapping>
    </web-app>

4、在src>bean包下建立UserTable.java

package bean;
    
    public class UserTable {
    	private int id;
    	private String account;
    	private String password;
    	@Override
    	public String toString() {
    		return "UserTable [id=" + id + ", account=" + account + ", password=" + password + "]";
    	}
    	public int getId() {
    		return id;
    	}
    	public void setId(int id) {
    		this.id = id;
    	}
    	public String getAccount() {
    		return account;
    	}
    	public void setAccount(String account) {
    		this.account = account;
    	}
    	public String getPassword() {
    		return password;
    	}
    	public void setPassword(String password) {
    		this.password = password;
    	}
    	
    }

5、在src>util包下建立数据库工具包DBUtil.java

package util;
    import java.sql.*;
    
    public class DBUtil { 
    	static String url="jdbc:mysql://localhost:3306/mydb?useSSL=false";
    	static String user="root";
    	static String password="root123";
    	
    	static Connection conn=null;
    	PreparedStatement ps=null;
    	ResultSet rs=null;
    
    	static{
    		try {
    			Class.forName("com.mysql.jdbc.Driver");
    		} catch (ClassNotFoundException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    	}
    	public static Connection getConnection(){
    		try {
    			conn=DriverManager.getConnection(url,user,password);
    		} catch (SQLException e) {
    			// TODO Auto-generated catch block
    			e.printStackTrace();
    		}
    		return conn;
    	}
    	public static void close(ResultSet rs,PreparedStatement ps,Connection conn){
    		try{
    			if(rs!=null)
    				rs.close();
    			if(ps!=null)
    				ps.close();
    			if(conn!=null)
    				conn.close();
    		}catch(java.sql.SQLException e){
    			e.printStackTrace();
    		}
    	}
    }

6、在WebRoot下建立login.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>
        <title>struts login</title>
      </head>
      
      <body>
        <s:form action="main" method="post"> 
        	<table>
        		<caption>User Login</caption>
    	    	<tr>
    	    		<td>
    	    			<s:textfield name="user.account" label="Account" size="20"></s:textfield>
    	    		</td>
    	    	</tr>
    	    	<tr>
    	    		<td>
    	    			<s:password name="user.password" label="Password" size="21"></s:password>
    	    		</td>
    	    	</tr>
    	    	<tr>
    	    		<td>
    	    			<s:reset value="reset"/>
    	    			<s:submit value="submit"/> 
    	    		</td>
    	    	</tr>
        	</table>
        </s:form>
      </body>
    </html>

7、在WebRoot下建立success.jsp

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
    <%@ taglib prefix="s" uri="/struts-tags" %>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>   
        <title>success</title> 
      </head>
      
      <body>
        <s:set name="user" value="#session['user']"/>
        <s:property value="#user.account"/>，您好！欢迎登录。
      </body>
    </html>

8、在WebRoot下建立error.jsp

<%@ page language="java" import="java.util.*" pageEncoding="ISO-8859-1"%>
    
    <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
    <html>
      <head>   
        <title>error</title>
      </head> 
      <body>
        <h2 style="text-align:center;margin-top:100px">Error Login</h2>
      </body>
    </html>

9、在src>action包下建立MainAction.java

package action;
    
    import java.sql.Connection;
    import java.sql.PreparedStatement;
    import java.sql.ResultSet;
    import java.sql.SQLException;
    import java.util.Map;
    
    import com.opensymphony.xwork2.ActionContext;
    import com.opensymphony.xwork2.ActionSupport;
    
    import bean.UserTable;
    
    public class MainAction extends ActionSupport{
    	private UserTable user;
    	
    	public String execute() throws Exception{
    		String account=user.getAccount();
    		String password=user.getPassword();
    		System.out.println(account);
    		System.out.println(password);
    		boolean flag=false;
    		Connection conn=null;
    		PreparedStatement ps=null;
    		ResultSet rs=null;
    		conn=util.DBUtil.getConnection();
    		System.out.println(conn);
    		String sql="select * from loginusers";
    		
    		UserTable user2=null;
    		ActionContext context=ActionContext.getContext();
    		Map session=context.getSession();
    		user2=(UserTable)session.get("user");
    		
    		if(user2==null){
    			try{
    				ps=conn.prepareStatement(sql);
    				rs=ps.executeQuery();
    				while(rs.next()){
    					if(account.equals(rs.getString("userName"))&&password.equals(rs.getString("password"))){
    						user2=new UserTable();
    						user2.setId(rs.getInt(1));
    						user2.setAccount(rs.getString(2));
    						user2.setPassword(rs.getString(3));
    						session.put("user",user2);
    						flag=true;
    					}					
    				}
    			}catch(SQLException e){
    				e.printStackTrace();
    			}finally{
    				util.DBUtil.close(rs, ps, conn);
    			}
    		}else{
    			flag=true;
    		}
    		if(flag)
    			return SUCCESS;
    		else
    			return ERROR;
    	}
    
    	public UserTable getUser() {
    		return user;
    	}
    	public void setUser(UserTable user) {
    		this.user = user;
    	}
    }

10、在src下新建struts.xml文件

<?xml version="1.0" encoding="UTF-8"?>
    <!DOCTYPE struts PUBLIC
            "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
            "http://struts.apache.org/dtds/struts-2.0.dtd">
    	<struts>
    		<package name="default" extends="struts-default">
    			
    			<action name="main" class="action.MainAction">
    				<result name="success">/success.jsp</result>
    				<result name="error">/error.jsp</result>
    			</action>
    		</package>
    		
    	</struts>

11、保存启动Tomcat，在浏览器输入[http://localhost:8080/struts2test1/login.jsp][http_localhost_8080_struts2test1_login.jsp]

![70][]

登录失败

![70 1][]

登录成功

![70 2][]

注意：已经保存了用户的session对象，登录成功后不需再登录，要先进行失败登录测试,如果出现NOT FOUND，可能是web.xml的filter-class类名不符

[http_localhost_8080_struts2test1_login.jsp]: http://localhost:8080/struts2test1/login.jsp
[70]: /images/20220519/d8dc05dae1c94fa6b2c1850bd62f92ba.png
[70 1]: /images/20220519/84181d5e41df4cbea1662e0d08afe618.png
[70 2]: /images/20220519/cbae4aab7f4b4bac81303c8cdd636ca9.png