java - servlet3.1注解不生效

问题描述

我新建了个servlet项目:

package hello;import java.io.IOException;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 HelloServlet */@WebServlet('/Hello')public class HelloServlet extends HttpServlet { private static final long serialVersionUID = 1L; /** * Default constructor. */ public HelloServlet() {// 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 stubresponse.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 stubdoGet(request, response); }}

然后访问http://localhost:8080/hello/H...显示404

但访问别的jsp页面正常然后我加了个web.xml文件:

<?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' version='3.1'></web-app>

就能访问了

但是我再新建个servlet文件,新建的却还是无法访问

@WebServlet('/World')public class WorldServlet extends HttpServlet {

为什么会这样啊?难道不能用注解了?我用的tomcat 8.5 , Java 1.8 , servlet 3.1 , eclipse 4.6.0 (Neon)求解注解为什么不能用啊

项目结构:

问题解答

把你整个项目结构发出来看下

开始放错图片,以修正