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最新推荐文章于 2024-08-06 16:14:32 发布

helloworld_1996

最新推荐文章于 2024-08-06 16:14:32 发布

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分类专栏： 2018

本文链接：https://blog.youkuaiyun.com/helloworld_1996/article/details/79837493

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本文介绍了一个使用Java实现的简单登录页面示例，并详细展示了如何通过Servlet进行登录验证的过程。该示例包括了HTML登录界面的设计及后端Java代码，具体实现了从数据库中查询用户名和密码的功能。

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<%@ 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 'login.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>
    <center>
        <form action="/demo17/login" method="post">
            账号:<input type="text" name="zhang"><br>
            密码:<input type="text" name="mima"><br>
            <input type="submit" value="登录"> 
        </form>
    </center>
  </body>
</html>

package com.www.servlet;

import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;

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

import com.mysql.jdbc.Driver;

public class LoginServlet extends HttpServlet {


    public void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        request.setCharacterEncoding("utf-8");
        response.setCharacterEncoding("utf-8");
        response.setContentType("text/html;charset=utf-8");

        String zhangs = request.getParameter("zhang");
        String mimas = request.getParameter("mima");

        try {
            Class.forName("com.mysql.jdbc.Driver");
            Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/login", "root", "root");
            String sql = "select * from user03 where id=? and pwd=?;";
            PreparedStatement pst = con.prepareStatement(sql);

            pst.setString(1, zhangs);
            pst.setString(2, mimas);

            ResultSet rs = pst.executeQuery();


            if(rs.next()){
                System.out.println("登录成功");
            }else{
                System.out.println("登录失败");
            }


        } catch (Exception e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }

    }


    public void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {

        doGet(request, response);
    }

}