SpringBoot之Servlet（C）

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spring boot中添加自己的Servlet有两种方法，代码注册Servlet和注解自动注册
一、代码注册通过ServletRegistrationBean、 FilterRegistrationBean 和 ServletListenerRegistrationBean 获得控制。
也可以通过实现 ServletContextInitializer 接口直接注册。

二、在 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。

代码注册Servlet

DemoApplication.java

package cn.wuyang.springboot;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import cn.wuyang.springboot.servlet.MyServlet;@SpringBootApplicationpublic class DemoApplication {    /**     * 使用代码注册Servlet（不需要@ServletComponentScan注解）     *     */    @Bean    public ServletRegistrationBean servletRegistrationBean() {        return new ServletRegistrationBean(new MyServlet(), "/myservlet");// ServletName默认值为首字母小写，即myServlet    }    public static void main(String[] args) {        SpringApplication.run(DemoApplication.class, args);    }}

MyServlet.java

package cn.wuyang.springboot.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;@WebServlet(urlPatterns="/myservlet")public class MyServlet 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");        resp.setCharacterEncoding("UTF-8");        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>大家好，我的名字叫Servlet</h1>");          out.println("</body>");          out.println("</html>");    }}

注解注册Servlet

DemoApplication.java

package cn.wuyang.springboot;import org.springframework.boot.SpringApplication;import org.springframework.boot.autoconfigure.SpringBootApplication;import org.springframework.boot.web.servlet.ServletComponentScan;import org.springframework.boot.web.servlet.ServletRegistrationBean;import org.springframework.context.annotation.Bean;import cn.wuyang.springboot.servlet.MyServlet;@SpringBootApplication@ServletComponentScan          //加上这个就可以了public class DemoApplication {    public static void main(String[] args) {        SpringApplication.run(DemoApplication.class, args);    }}

MyServlet.java 不变

效果展示

这里写图片描述

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