Servlet3.x

Servlet/filter/listener 支持注解实现

创建serlvet3.x项目

点击next两次

[2]创建servlet

 

Tips：多了@WwebServlet注解。  Web.xml中没有servlet相关的配置

[3] @WebServlet

   Value: url   数组类型

                   @WebServlet("/hello3")

@WebServlet(value = {"/hello3","hello"})

   Name : servlet的名称

   loadOnStartup:配置服务器启动时创建该serlvet

initParams：配置初始化参数

 

[4] @WebFilter(filterName="ffilter",value={"/*"})

Tips:当使用注解实现filter时，执行顺序为类名的字母顺序。

[5] @WebListener

 在实现监听器的类上方添加注解即可。

Servlet3.x对文件上传的支持。

使用注解配置一个servlet：

package com.igeek.servlet;

import java.io.IOException;

import javax.jws.soap.InitParam;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebInitParam;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 * 
 * @author www.igeehome.com
 * 
 * TODO 使用注解配置一个servlet
 *
 * 2018年8月25日下午3:18:36
 */
@WebServlet(name = "helloservlet", value = { "/hello3", "/hello" }, loadOnStartup = 1, initParams = {
		@WebInitParam(name = "abc", value = "def") })
public class Hello3Servlet extends HttpServlet {
	private static final long serialVersionUID = 1L;

	/**
	 * @see HttpServlet#HttpServlet()
	 */
	public Hello3Servlet() {
		super();
		// 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 stub
		System.out.println("execute Hello3Servlet doGet");
		response.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 stub
		doGet(request, response);
	}

}