无法正常访问Servlet

8080可以访问  但是 不能访问http://localhost:8080/FirstServlet/hi?name=tom

package test1;

import java.io.IOException;

import java.io.PrintWriter;

import javax.security.auth.message.callback.PrivateKeyCallback.Request;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

public class Lab01_FirstServlet extends HttpServlet{

@Override

protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {

String name=req.getParameter("NAME");//接收请求发来的参数

String html="<h1 style='color:red'>hi,"+ name +"!</h1><hr>";

System.out.println("返回给浏览器的相应数据为"+html);

PrintWriter out=resp.getWriter();

out.println(html);//将html返回给浏览器

}

}

web.xml

<?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_4_0.xsd" version="4.0">

  <display-name>T1Web</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>

  <!-- 声明Servlet -->

   <servlet>

  <!-- servlet的别名，自定义，什么名字都可以 -->

  <servlet-name>FirstServlet</servlet-name>

  <servlet-class>test1.Lab01_FirstServlet</servlet-class>

  </servlet>

  <!-- 将Servlet与Url绑定 -->

  <servlet-mapping>

  <servlet-name>FirstServlet</servlet-name>

  <url-pattern>/hi</url-pattern>

  </servlet-mapping>

</web-app>