软件1班20240607

html 复制代码

<%--
  Created by IntelliJ IDEA.
  User: Administrator
  Date: 2024/6/7
  Time: 8:38
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>Title</title>
</head>
<body>
    <a href="/demo/login">前往登录</a>

</body>
</html>

xml 复制代码

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_4_0.xsd"
         version="4.0">
    <servlet>
        <servlet-name>aa</servlet-name>
        <servlet-class>com.yanyu.Login</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>aa</servlet-name>
        <url-pattern>/demo/login</url-pattern>
    </servlet-mapping>
    <servlet>
        <servlet-name>bb</servlet-name>
        <servlet-class>com.yanyu.Demmo</servlet-class>
    </servlet>
    <servlet-mapping>
        <servlet-name>bb</servlet-name>
        <url-pattern>/list</url-pattern>
    </servlet-mapping>

</web-app>

java 复制代码

package com.yanyu;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class Login extends HttpServlet {
//       重写  父类方法    ctrl o


    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        super.doGet(req, resp);   调用   父类的方法   super  ==  父类 的对象
//        设置   响应的类型和  编码格式
        /*   浏览器  --》 服务器 的 数据   request
        服务器  --》  浏览器 的  数据   response
        * request
        * response
        * */
        response.setContentType("text/html");
        response.setCharacterEncoding("utf-8");
//        获取响应对象
        PrintWriter out = response.getWriter();//   ctrl   alt  v
//        out.println("<html lang=\"en\">");
        out.println("hello3");
//  多行  编辑   alt  鼠标拖动

out.println("        <!DOCTYPE html>");
out.println("");
out.println("<head>");
out.println("    <meta charset='UTF-8'>");
out.println("    <meta http-equiv='X-UA-Compatible' content='IE=edge'>");
out.println("    <meta name='viewport' content='width=device-width, initial-scale=1.0'>");
out.println("    <title>Document</title>");
out.println("</head>");
out.println("<body>");
out.println("    <h1>登录界面</h1>");
out.println("    <form action='/list'>");
//    src   =  href  =  action    都是   路径  都是  url
out.println("                账号<input type='text' name='username' >");
out.println("    <br>");
out.println("                密码<input type='password' name='password' >");
out.println("    ");
out.println("    <br>");
out.println("    <input type='submit'  value='登录'>");
out.println("    </form>");
out.println("</body>");
out.println("</html>");









    }
}

java 复制代码

package com.yanyu;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

public class Demmo extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
//        获取   浏览器 的数据   request
//        设置  请求  编码
        request.setCharacterEncoding("utf-8");
        String username = request.getParameter("username");//  CTRL   alt  v
        String pass = request.getParameter("password");//  CTRL   alt  v
//          通过  name   属性的  值   username   去  拿到  账号
        System.out.println(username);///  打印到服务器控制台   4232354
        System.out.println(pass);///  打印到服务器控制台   4232354

    }
}