struts2连接数据库实现用户注册与登录

利用struts2框架连接数据库实现用户注册与登录

工具/原料

• eclipse、struts-2.3.16.3

• Mysql

方法/步骤

1. 1

   工程目录：

   
2. 工程用到的jar包有：

   
3. 数据库用户表tb_user：

   
4. web.xml的配置：

   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"

   xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"

   version="2.4">

    

           struts2

          

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

      

      

           struts2

           /*

      

    

    

       login.jsp

    

5. struts.xml的配置：

   /error.jsp

   /welcome.jsp

   /error.jsp

   /welcome.jsp

6. 数据库Dao.java

   package dao;

   import java.sql.*;

   public class Dao {

   Connection con = null;

   Statement stat = null;

   ResultSet rs = null;

   public Dao() {

   try {

   Class.forName("com.mysql.jdbc.Driver");

   con = DriverManager.getConnection("jdbc:mysql://localhost:3306/db_vote","root","root");

   stat = con.createStatement();

   } catch (Exception e) {

   // TODO: handle exception

   con = null;

   }

   }

   public ResultSet executeQuery(String sql) {

   try {

   rs = stat.executeQuery(sql);

   } catch (Exception e) {

   // TODO: handle exception

   rs = null;

   }

   return rs;

   }

   public int executeUpdate(String sql) {

   try {

   stat.executeUpdate(sql);

   return 0;

   } catch (Exception e) {

   // TODO: handle exception

   }

   return -1;

   }

   }

7. UserAction.java

   package com;

   import java.sql.*;

   import com.opensymphony.xwork2.ActionSupport;

   import dao.Dao;

   @SuppressWarnings("serial")

   public class UserAction extends ActionSupport{

   private Dao dao = new Dao();

   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 login() {

   String sql = "select * from tb_user where username='" + getUsername()+"' and password ='"+getPassword()+"'";

   ResultSet rS = dao.executeQuery(sql);

   try {

   if (rS.next()) {

   return "loginin";

   }

   return "loginout";

   } catch (SQLException e) {

   // TODO Auto-generated catch block

   e.printStackTrace();

   return "loginout";

   }

   }

   public String regist() {

   String sql = "insert into tb_user(username,password,isCheck) values('"+getUsername()+"','"+getPassword()+"','0')";

   int i = dao.executeUpdate(sql);

   if (i > -1) {

   return "success";

   }

   return "error";

   }

   //通用的执行方法

   // public String execute() throws Exception {

   // if (getUsername().equals("scott") && getPassword().equals("tiger")) {

   // System.out.println("我是success");

   // return "success";

   // }

   //

   // else {

   // System.out.println("我是error");

   // return "error";

   // }

   // }

   }

8. 用户注册界面regist.jsp

   <%@ page language="java" contentType="text/html; charset=UTF-8"

       pageEncoding="UTF-8"%>

   用户登录

   username:
   password:

9. 登录界面login.jsp

   <%@ page language="java" contentType="text/html; charset=UTF-8"

       pageEncoding="UTF-8"%>

   用户登录

   用户名：

   密码：

10. 操作错误页面error.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"

        pageEncoding="UTF-8"%>

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

    执行失败！！

11. 操作成功界面welcome.jsp

    <%@ page language="java" contentType="text/html; charset=UTF-8"

        pageEncoding="UTF-8"%>

    您已经执行成功！