Struts2 + MySql 数据库实现登录

原文地址 ：http://liyazhouhappy.blog.163.com/blog/static/1777910542012719101644256/

Struts2 + MySql 数据库实现登录  

2012-08-19 10:33:36|  分类： 4. Struts2|举报|字号 订阅

一、搭建Struts2环境

1.所需Jar包：（需要添加MySql数据库驱动）

         commons-fileupload-1.2.1.jar
         commons-logging-1.0.4.jar
         freemarker-2.3.13.jar
         mysql-connector-java-5.1.6-bin.jar
         ognl-2.6.11.jar
         struts2-core-2.1.6.jar
         xwork-2.1.2.jar
2.配置web.xml

xml version="1.0" encoding="gbk"?> version="2.5"  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_2_5.xsd">       login.jsp           encodingFilter    com.login.filter.EncodingFilter           encodingFilter    /*   

             struts2        

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter

   

            struts2         /*    

3.Struts.xml配置

xml version="1.0" encoding="UTF-8" ?>     "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"     "http://struts.apache.org/dtds/struts-2.0.dtd">

  file="struts-default.xml" />   name="struts.locale" value="zh_CN"/>   name="struts.i18n.encoding" value="GBK"/>       name="lee" namespace="/" extends="struts-default">         name="login" class="com.loginAction.LoginAction">             name="success">/success.jsp             name="login">/error.jsp            

4.创建数据库login，然后在数据库login中创建一个user表，该表有两个字段username和password，字段类型为varchar类型。然后再输入两条记录

二、编写Java代码

1.建立一个com.login.filter包，在包下新建一个Java类

package com.login.filter;

import java.io.IOException;

import javax.servlet.Filter; import javax.servlet.FilterChain; import javax.servlet.FilterConfig; import javax.servlet.ServletException; import javax.servlet.ServletRequest; import javax.servlet.ServletResponse;

public class EncodingFilter implements Filter {

 public void destroy() {   // TODO Auto-generated method stub

 }

 public void doFilter(ServletRequest arg0, ServletResponse arg1,    FilterChain arg2) throws IOException, ServletException {   // TODO Auto-generated method stub   arg0.setCharacterEncoding("GBK");   arg2.doFilter(arg0, arg1);  }

 public void init(FilterConfig arg0) throws ServletException {   // TODO Auto-generated method stub

 }

}

2.创建一个com.loginAction包，在该包下新建一个Java类

package com.loginAction;

import java.sql.Connection; import java.sql.DriverManager; import java.sql.PreparedStatement; import java.sql.ResultSet; import java.sql.Statement;

import com.opensymphony.xwork2.ActionSupport;

public class LoginAction extends ActionSupport {  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;  }  public String execute(){   boolean flag=Login(username,password);   if(flag)    return SUCCESS;   else    return LOGIN;  }     /*验证登录是否成功*/  public boolean Login(String username,String password){   boolean flag=false;   Connection conn = null;   ResultSet rs = null;   Statement stmt = null;      String DBDriver = "com.mysql.jdbc.Driver";   try{    Class.forName(DBDriver);    conn=DriverManager.getConnection("jdbc:mysql://localhost:3306/login", "root", "root");      stmt=conn.createStatement();    System.out.println("测试连接！");    System.out.println(username);    rs = stmt.executeQuery("select * from user where username ='" + username +"' and password = '"+ password+"'");    if(rs.next()){     System.out.println("登录成功！");     flag=true;    }   }catch(Exception e){    System.out.print("连接错误！");    e.printStackTrace();   }   return flag;  }    }

三、编写页面代码

需要3个页面login.jsp、success.jsp和error.jsp

1.login.jsp页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

       

    action="login" method="post">   用户名: name="username"/>
  密  码: name="password"/>
   value="登录" type="submit"> type="reset" value="取消"/>    

2.success.jsp页面代码:

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

     

登录成功！

 

3.error.jsp页面代码：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

     

登录失败！

    href="login.jsp">返回登录页面  

四、运行结果

运行项目，实现登录功能。