关于2-1：完全按照视频操作，但是网页404

相关截图：

相关代码：

package com.imooc.servlet;

import java.io.IOException;
import java.io.PrintWriter;

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

public class FirstServlet extends HttpServlet{





	@Override
	protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		//接收请求发来的参数
		String name = request.getParameter("name");
		String html = "<h1 style='color:red'>hi," + name +"!</h1><hr/>";
		System.out.println("返回给浏览器的响应数据为：" + html);
		PrintWriter out = response.getWriter();
		out.println(html);//将html发送回浏览器
	}

相关代码：

​<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://xmlns.jcp.org/xml/ns/javaee"
	xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
	id="WebApp_ID" version="3.1">
	<display-name>FirstServelt</display-name>
	<welcome-file-list>
		<welcome-file>index.html</welcome-file>
		<welcome-file>index.htm</welcome-file>
		<welcome-file>index.jsp</welcome-file>
		<welcome-file>default.html</welcome-file>
		<welcome-file>default.htm</welcome-file>
		<welcome-file>default.jsp</welcome-file>
	</welcome-file-list>
	<servlet>
		<!-- servlet别名 -->
		<servlet-name>first</servlet-name>
		<servlet-class>com.imooc.servlet.FirstServlet</servlet-class>
	</servlet>
	<!-- 将Servlet与URL绑定 -->
	<servlet-mapping>
		<servlet-name>first</servlet-name>
		<url-pattern>/hi</url-pattern>
	</servlet-mapping>
</web-app>