jsp第十次作业

 

 

 

 

package com.dhy.servlet;

import java.io.IOException;
import java.sql.Connection;

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;


import com.dhy.dao.BaseDao;
import com.dhy.dao.UsersDao;
import com.dhy.bean.Users;

public class Loginservlet extends HttpServlet {
    //声明
    private final String SUCCESS_VIEW = "MyJsp.jsp";
    private final String ERROR_VIEW = "index.jsp";
    private  UsersDao userDao = new UsersDao();
    private BaseDao basedao = new BaseDao();
   
 
 protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
       this.doPost(request, response);
   }

   
public void doPost(HttpServletRequest request,HttpServletResponse response)
       throws ServletException,IOException{
           //1.防止乱码
       request.setCharacterEncoding("utf-8");
       response.setContentType("text/html;charset=utf-8");
       //2.获取页面信息
        String username = request.getParameter("username");
       String password = request.getParameter("password");
       //3.获取登录用户信息
       request . getSession().setAttribute ( "UserName" , username ) ; 
       request.getSession().setAttribute("password", password);
       Connection con=null;
          //4.验证操作，将用户信息封装到currentUser
          try {
              Users user = new Users(username,password);
               con = basedao.getConnection();
               Users currentUser = userDao.login(con, user);
               if (null == currentUser) {
                   //5.输入信息错误
                   request.setAttribute("error", "用户名或密码错误");
                   request.setAttribute("userName", username);
                   request.setAttribute("password", password);
                   RequestDispatcher dispatcher = request.getRequestDispatcher(ERROR_VIEW);
                   dispatcher.forward(request, response);
               }else {
                   //6.输入正确的信息
                   HttpSession session = request.getSession();
                   session.setAttribute("currentUser",currentUser);
                   response.sendRedirect(SUCCESS_VIEW );
               }
       } catch (Exception e) {
           // TODO Auto-generated catch block
           e.printStackTrace();
       }
    
}

}
<%@ 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>My JSP 'index.jsp' starting page</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>
    <h1>登录</h1>
    <form action="textServlet" method="post">
        用户名：<input type="text" name="username" value="${username}" /><br/>
        密   码：<input type="password" name="password" value=""/><br/>
    <input type="submit" value="登录"/>
    <a href="regist.jsp">注册</a>
    </form>
    <font color="red">${error}</font>
  </body>



</html>
package com.dhy.bean;

public  class Users {
    String username;
    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 Users(String username,String password) {
        this.username=username;
        this.password=password;
        // TODO Auto-generated constructor stub
    }
    public Users() {
        
        // TODO Auto-generated constructor stub
    }

}

 

posted @ 2020-05-28 21:18  Docean  阅读(115)  评论(0)  编辑  收藏  举报