Spring Boot 整合Servlet-白红宇

Spring Boot 整合Servlet

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发布时间：2019-05-10

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冷知识，几乎用不到

在spring boot中使用Servlet有两种实现方法；

方法一：

正常创建servlet,然后只用注解@ServletComponentScan

package clc.user.servlet;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * ClassName: FirstServlet
 * Description:spring boot 整合sevlet 
 * date: 2019/4/1 4:07 PM
 *  * 正常创建Servlet * 可以使用@WebServlet注解实现 * 在spring boot启动类加注解@ServletComponentScan,会让spring启动时扫描@WebServlet注解并实例化 * * @author chengluchao * @since JDK 1.8 */@WebServlet(name = "FirstServlet", urlPatterns = "/FirstServlet")public class FirstServlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        super.doGet(req, resp);        System.out.println("FirstServlet");    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        super.doPost(req, resp);    }}

对应的启动类：

@SpringBootApplication@ServletComponentScanpublic class UserServiceApplication {    public static void main(String[] args) {        SpringApplication.run(UserServiceApplication.class, args);    }}

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方法二：

正常创建Servlet，但不对其进行配置，放到启动类来操作

package clc.user.servlet;import javax.servlet.ServletException;import javax.servlet.annotation.WebServlet;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.IOException;/** * ClassName: SecondServlet
 * Description:spring boot 整合sevlet 
 * date: 2019/4/1 4:07 PM
 *  * * @author chengluchao * * 需要： * @Bean public ServletRegistrationBean getServletRegistrationBean() { * ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet()); * bean.addUrlMappings("SecondServlet"); * return bean; * } * @since JDK 1.8 */public class SecondServlet extends HttpServlet {    @Override    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        super.doGet(req, resp);        System.out.println("SecondServlet");    }    @Override    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {        super.doPost(req, resp);    }}

@SpringBootApplicationpublic class UserServiceApplication2 {    @Bean    public ServletRegistrationBean getServletRegistrationBean() {        ServletRegistrationBean bean = new ServletRegistrationBean(new SecondServlet());        bean.addUrlMappings("/SecondServlet");        return bean;    }    public static void main(String[] args) {        SpringApplication.run(UserServiceApplication2.class, args);    }}