用servlet进行用户名和密码校验

Posted 2020-08-11 是有一只猫出没

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一、效果图

二、链接

链接：https://pan.baidu.com/s/1a8sg96M2rXc0aAVv3guQ8w
提取码：dylr
复制这段内容后打开百度网盘手机App，操作更方便哦

三、代码

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>西南石油大学电子邮件系统</title>
<link rel="stylesheet" type="text/css" href="css/style.css">
</head>
 
<body>
 
    <div class="top">
        <div class="r1">
            <div class="r2">
                <div class="logo"></div>
            </div>
            <a href="" target="" class="help">帮助</a>
        </div>
    </div>
 
    <div class="content">
        <div class="loginBar">
            <div class="box">
                <div class="tab">
                    账号登录
                    <div class="dragbar"></div>
                </div>
            </div>
            <div class="boxc">
                <div style="height: 10px;"></div>
                <div style="margin-left: 42px; width: 270px; height: 30px;">
                    <div class="hh" id="hd">用户登录</div>
                </div>
                <form method="post" action="LoginServlet"  >
                <input type="text" class="text" name="username" id="username" style="ime-mode: disabled" _autocomplete="off" placeholder="用户名" />
                    <input type="password" class="text" name="password" id="password" _autocomplete="off" placeholder="密码" />
                    <div style="height: 10px;"></div>
                    <div class="bl">
                        <span style="float: left;"> <font style="color: red; font-family: 宋体; clear: both;">学生选择@stu.swpu.edu.cn</font>
                        </span> <span style="float: right;"> <a href="" style="outline: none; color: #999;">忘记密码</a>
                        </span>
                    </div>
                    <input type="submit" class="btn" value="登 录" style="background: url(img/login_btn.jpg)" />
                </form>
 
            </div>
        </div>
    </div>
 
    <div class="bottom">西南石油大学</div>
 
</body>
</html>


package com.swpu;
 
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
/**
 * Servlet implementation class LoginServlet
 */
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
    private static final long serialVersionUID = 1L;
    private String User;
    private String Password;
     
 
        
    /**
     * @see HttpServlet#HttpServlet()
     */
    public LoginServlet() {
        super();
        // TODO Auto-generated constructor stub
    }
 
    /**
     * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.getWriter().append("Served at: ").append(request.getContextPath());
    }
 
    /**
     * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        // TODO Auto-generated method stub
        response.setContentType("text/html;charset=UTF-8");
        response.setCharacterEncoding("utf-8");
        PrintWriter out=response.getWriter();
        //获取参数
        User=request.getParameter("username");
        Password=request.getParameter("password");
 
        if(User.equals("tom") && Password.equals("123")) {
            out.print("<h1>登陆成功</h1>");
            out.print("欢迎 : " + User+",您的密码是:"+Password);
        }else if(User==""||Password==""){
            out.print("<h1>用户名或密码不能为空</h1>");
        }else {
            out.print("<h1>用户名或密码错误</h1>");
        }
            out.close();
    }
 
}

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