1.建立一個springboot專案

package com.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.FilterRegistrationBean;
import org.springframework.boot.web.servlet.ServletComponentScan;
import org.springframework.boot.web.servlet.ServletListenerRegistrationBean;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.util.concurrent.ListenableFutureCallbackRegistry;

import com.test.filter.SecondFilter;
import com.test.listener.SecondListener;
import com.test.servlet.Hello02Servlet;

@SpringBootApplication
public class App2 {
	public static void main(String[] args) {
		SpringApplication.run(App2.class, args);
	}
	@Bean
	public ServletRegistrationBean getServlet(){
		ServletRegistrationBean bean=new ServletRegistrationBean(new Hello02Servlet(),"/hello02");
		return bean;
	}
}
 

2.建立一個servlet類

package com.test.servlet;

import java.io.IOException;

import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
 * springboot整合servlet方式一
 * <servlet>
 * 		<servlet-name>hello</servlet-name>
 * 		<servlet-class>com.test.servlet.HelloServlet</servlet-class>
 * </servlet>
 * <servlet-mapping>
 * 		<servlet-name>hello</servlet-name>
 * 		<url-pattern>/hello</url-pattern>
 * </servlet-mapping>
 * @author 26920
 *
 */
public class Hello02Servlet extends HttpServlet{

	@Override
	protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
		System.out.println("hello02======");
		super.doGet(req, resp);
	}
}
 

3.相比註解方式，在servlet類中不用做任何處理，可以在springboot配置類中加方法建立bean，只要有@Configuration註解的類都是配置類，@SpringBootApplication註解是一個組合註解包含@Configuration，所以我在類中寫了個方法，方法名隨便但方法的返回型別必須是ServletRegistrationBean。ServletRegistrationBean類中可以設定訪問路幾個。