springboot注册servlet,Filter,Listener

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注解注册
SpringBootApplication 上使用@ServletComponentScan注解后，Servlet、Filter、Listener 可以直接通过 @WebServlet、@WebFilter、@WebListener 注解自动注册，无需其他代码。

package com.kfit.servlet;import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * * @author Angel(QQ:412887952) * @version v.0.1 */@WebServlet(urlPatterns="/myServlet2/*", description="Servlet的说明")public class MyServlet2 extends HttpServlet{       private static final long serialVersionUID = 1L;       @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        System.out.println(">>>>>>>>>>doGet()<<<<<<<<<<<");        doPost(req, resp);    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        System.out.println(">>>>>>>>>>doPost()<<<<<<<<<<<");        resp.setContentType("text/html");         PrintWriter out = resp.getWriter();         out.println("<html>");         out.println("<head>");         out.println("<title>Hello World</title>");         out.println("</head>");         out.println("<body>");         out.println("<h1>这是：myServlet2</h1>");         out.println("</body>");         out.println("</html>");    }}import org.springboot.sample.servlet.MyServlet;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.context.embedded.ServletRegistrationBean;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.context.annotation.Bean;import org.springframework.web.servlet.DispatcherServlet;@SpringBootApplication@ServletComponentScan//这个就是扫描相应的Servlet包;public class SpringBootSampleApplication {    public static void main(String[] args) {        SpringApplication.run(SpringBootSampleApplication.class, args);    }}

代码注册

import java.io.IOException;import java.io.PrintWriter;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;/** * * @author Angel(QQ:412887952) * @version v.0.1 *///这个不需要添加.//@WebServlet(urlPatterns="/myServlet1/*", description="Servlet的说明")publicclass MyServlet1 extends HttpServlet{    privatestaticfinallongserialVersionUID = 1L;    @Override    protectedvoid doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        System.out.println(">>>>>>>>>>doGet()<<<<<<<<<<<");        doPost(req, resp);    }    @Override    protectedvoid doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        System.out.println(">>>>>>>>>>doPost()<<<<<<<<<<<");        resp.setContentType("text/html");         PrintWriter out = resp.getWriter();         out.println("<html>");         out.println("<head>");         out.println("<title>Hello World</title>");         out.println("</head>");         out.println("<body>");         out.println("<h1>这是：MyServlet1</h1>");         out.println("</body>");         out.println("</html>");    }}import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.context.embedded.ServletRegistrationBean;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.context.annotation.Bean;import com.kfit.servlet.MyServlet1;/** * * * 大家也许会看到有些demo使用了3个注解： @Configuration； * * @EnableAutoConfiguration * @ComponentScan * *                                 其实：@SpringBootApplication申明让spring boot自动给程序进行必要的配置， * *                等价于以默认属性使用@Configuration， *                @EnableAutoConfiguration和@ComponentScan * * 所以大家不要被一些文档误导了，让自己很迷茫了，希望本文章对您有所启发； * * @author Angel(QQ:412887952) * @version v.0.1 */@SpringBootApplicationpublic class App {         /**          * 注册Servlet.不需要添加注解：@ServletComponentScan          * @return          */         @Bean         public ServletRegistrationBean MyServlet1(){                   return new ServletRegistrationBean(new MyServlet1(),"/myServlet/*");         }         public static void main(String[] args) {                   SpringApplication.run(App.class, args);         }}

原文：http://412887952-qq-com.iteye.com/blog/2292472

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