package com.example.combine.servlet.sbservlet;

 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;

 /**

  *

  * @author  SpringBoot 整合Servlet方式1 创建servlet时需要在web.xml进行配置。 <servlet>

  *         <servlet-name>ServletDemo1</seevlet-name>

  *         <servlet-classs>com.example.combine.servlet.sbservlet.ServletDemo1</servlet-class>

  *         </servlet>

  *

  *         <servlet-mapping> <servlet-name>ServletDemo1</servlet-name>

  *         <url-pattern>/first</url-pattern> </servlet-mapping>

  *

  *         但是在servlet3.0以后可以使用注释的方式来配置，且在springboot中也没有web.xml

  */

 // 在哪个class添加了这个注释就意味着哪个class就是servlet

 @WebServlet(name = "ServletDemo1", urlPatterns = "/first")

 public class ServletDemo1 extends HttpServlet {

     @Override // 重写doget方法

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

         // TODO Auto-generated method stub

         super.doGet(req, resp);

         System.out.print("这是第一种方式");     //在控制台中输出

     }

 }

 package com.example.combine.servlet.sbservlet;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 import org.springframework.boot.web.servlet.ServletComponentScan;

 //import org.springframework.web.bind.annotation.RestController;

 /**

  * SpringBoot整合servlet方式一 这种方式在控制台看到了相关的输出信息，但是在浏览器打开的时候是错误的页面信息

  */

 @SpringBootApplication

 @ServletComponentScan // 在SppringBoot启动时扫描@WebServlet，并将该类实例化

 // @RestController

 public class App {

     public static void main(String[] args) {

         SpringApplication.run(App.class, args);

     }

 }

package com.example.combine.servlet.sbservlet;

import java.io.IOException;

import javax.servlet.ServletException;

import javax.servlet.http.HttpServlet;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletResponse;

/**

 *

 * @author servlet整合springboot方式2

 *

 */

// 这种方式无须在servlet这个类中添加@WebServlet这个注释声明

public class ServletDemo2 extends HttpServlet {

    @Override

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

        // TODO Auto-generated method stub

        super.doGet(req, resp);

        System.out.println("这是第二种整合的方式");

    }

}

 package com.example.combine.servlet.sbservlet;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 import org.springframework.boot.web.servlet.ServletRegistrationBean;

 import org.springframework.context.annotation.Bean;

 @SpringBootApplication

 public class App1 {

     public static void main(String[] args) {

         // TODO Auto-generated method stub

         SpringApplication.run(App1.class, args);

     }

     // 添加如下的方法

     // 实现在启动类中注册servlet的方法

     @Bean // 添加@Bean的注释

     public ServletRegistrationBean getServlet() {

         // 通过ServletRegistrationBean完成对servlet的注册

         ServletRegistrationBean bean = new ServletRegistrationBean(new ServletDemo2());

         bean.addUrlMappings("/second"); // 该方法完成的是对urlPattern的配置

         return bean; // 将对象返回

     }

 }