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1 Spring Boot 中使用 Servlet
Spring Boot 中使用 Servlet有两种方式 方式一： 通过注解扫描方式实现 方式二：通过 SpringBoot 的配置类实现（组件注册） 2 方式一： 通过注解扫描方式实现创建一个servlet类 package com.liuhaiyang.springboot.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; //servlet第一种方式 @WebServlet(urlPatterns = "/myservlet") //定义请求路径，通过该路径能访问到这个servlet public class MyServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.getWriter().println("My Springboot-servlet-1"); resp.getWriter().flush(); resp.getWriter().close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doPost(req, resp); } }在SpringBoot项目的入口类上方使用注解 @ServletComponentScan 注解来扫描Servlet中的注解即可。 package com.liuhaiyang.springboot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.boot.web.servlet.ServletComponentScan; @SpringBootApplication @ServletComponentScan(basePackages = "com.liuhaiyang.springboot.servlet") //第一种的注解 public class SpringbootTest13Application { public static void main(String[] args) { SpringApplication.run(SpringbootTest13Application.class, args); } }结果截图：
2 方式二：通过 SpringBoot 的配置类实现（组件注册） 再次创建一个Servlet类。 package com.liuhaiyang.springboot.servlet2; 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; //servlet第二种方式 public class MyServlet extends HttpServlet { @Override protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { resp.getWriter().println("My Springboot-servlet-2"); resp.getWriter().flush(); resp.getWriter().close(); } @Override protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException { super.doPost(req, resp); } }编写一个 Spring Boot 的配置类，在该类中注册 Servlet 创建 ServletConfig 配置类 package com.liuhaiyang.springboot.config; import com.liuhaiyang.springboot.servlet2.MyServlet; import org.springframework.boot.web.servlet.ServletRegistrationBean; import org.springframework.context.annotation.Bean; import org.springframework.context.annotation.Configuration; @Configuration //该注解将此类定义为配置类（相当于一个xml文件） public class ServletConfig { //@Bean是一个方法级别上的注解，主要用于配置类里 相当于 @Bean public ServletRegistrationBean myServletRegistrationBean(){ ServletRegistrationBean servletRegistrationBean=new ServletRegistrationBean(new MyServlet(),"/myservlet"); return servletRegistrationBean; } }启动测试类 package com.liuhaiyang.springboot; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; @SpringBootApplication public class SpringbootTest13Application { public static void main(String[] args) { SpringApplication.run(SpringbootTest13Application.class, args); } }结果截图：
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