【Javaweb】【Servlet】简单验证用户的登陆



点击查看代码 | jsp 
<%--
  Created by IntelliJ IDEA.
  User: xrilang
  Date: 30/12/2021
  Time: 17:31
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
  <head>
    <title>$Title$</title>
  </head>
  <body>
  <form action="${pageContext.request.contextPath}/login" name="myform" id="myform" method="post" enctype="application/x-www-form-urlencoded">
    <label for="username">用户名</label>
    <input name="username" id="username" type="text" placeholder="用户名">
    <label for="password">密码</label>
    <input name="password" id="password" type="password">
    <input type="submit" name="btn" value="登录">
  </form>
  </body>
</html>
点击查看代码 | Servlet 
import jakarta.servlet.*;
import jakarta.servlet.http.*;
import jakarta.servlet.annotation.*;

import java.io.IOException;

@WebServlet(name = "login", value = "/login")
public class login extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
        doPost(request,response);
    }

    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        response.setCharacterEncoding("UTF-8");
        response.setContentType("text/html;charset=UTF-8");
        String name = request.getParameter("username");
        String pwd = request.getParameter("password");
//        System.out.println(name+" | "+pwd);
        if(name.equals("")){
            response.getWriter().write("<h1>请输入账号</h1><br/><a href='index.jsp'>返回</a>");
        }else if(pwd.equals("")){
            response.getWriter().write("<h1>请输入密码</h1><br/><a href='index.jsp'>返回</a>");
        }else if(name.equals("mllt9920")){
            if(pwd.equals("123456")){
                response.getWriter().write("<h1>登录成功</h1><br/>欢迎您,"+name+"<br/><a href='index.jsp'>返回</a>");
            }else{
                response.getWriter().write("<h1>密码错误</h1><br/><a href='index.jsp'>返回</a>");
            }
        }else{
            response.getWriter().write("<h1>账号错误</h1><br/><a href='index.jsp'>返回</a>");
        }
    }
}
点击查看代码 | pom.xml的 
<dependencies>
    <!-- https://mvnrepository.com/artifact/jakarta.servlet/jakarta.servlet-api -->
    <dependency>
        <groupId>jakarta.servlet</groupId>
        <artifactId>jakarta.servlet-api</artifactId>
        <version>5.0.0</version>
        <scope>provided</scope>
    </dependency>
    <!-- https://mvnrepository.com/artifact/jakarta.servlet.jsp/jakarta.servlet.jsp-api -->
    <dependency>
        <groupId>jakarta.servlet.jsp</groupId>
        <artifactId>jakarta.servlet.jsp-api</artifactId>
        <version>3.0.0</version>
        <scope>provided</scope>
    </dependency>

</dependencies>

Tomcat 10

posted @ 2021-12-30 19:00  萌狼蓝天  阅读(38)  评论(0)  编辑  收藏  举报