第三篇：Spring Boot整合Servlet

一、Springboot整合Servlet

第一种方案：

• 1、创建一个自定义的servlet，继承HttpServlet添加@WebServlet注解
• 以前ssm中的web.xml配置文件中的servlet>

<servlet>
  <servlet-name>FirstServlet</servlet-name>
  <servlet-class>com.gblfy.servlet.FirstServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>FirstServlet</servlet-name>
    <url-patten>/first</url-patten>
</servlet-mapping>

• Spring Boot 实现方式

/**
 * @author gblfy
 * @ClassNme FirstServlet
 * @Description SpringBoot整合Servlet 方式1
 * @Date 2019/2/19 14:49
 * @version1.0
 */
@WebServlet(name = "FirstServlet",urlPatterns = "/first")
public class FirstServlet extends HttpServlet {

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

• 2、在启动类中添加注解

/**
 - SpringBoot整合Servlet 方式1
 */
@SpringBootApplication
@ServletComponentScan//在springboot启动时会扫描@WebServlet注解，并将该类实例化
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

• 3、为了便于显示，在servlet中添加输出语句

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

• 4、浏览器访问：​​http://localhost:8080/first​​
• 5、查看控制台

第二种方案：

• 通过方法完成servlet组建的注册
• 1、编写一个自定义servlet

• 以前ssm中的web.xml配置文件中的servlet

<servlet>
  <servlet-name>FirstServlet</servlet-name>
  <servlet-class>com.gblfy.servlet.FirstServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>FirstServlet</servlet-name>
    <url-patten>/first</url-patten>
</servlet-mapping>

• Spring Boot 实现方式

/**
 * @author gblfy
 * @ClassNme FirstServlet
 * @Description SpringBoot整合Servlet 方式2
 * @Date 2019/2/19 14:49
 * @version1.0
 */
public class SecondServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("SecondServlet启动........");
    }
}

• 2、编写启动类，添加一个方法，通过@Bean注解注入bean

/**
 * SpringBoot整合Servlet 方式2
 */
@SpringBootApplication
@ServletComponentScan
public class SpringBootChapter3Application2 {

    public static void main(String[] args) {
        SpringApplication.run(SpringBootChapter3Application2.class, args);
    }

    @Bean
    public ServletRegistrationBean getServletRegistrationBean(){
        ServletRegistrationBean bean =
                new ServletRegistrationBean(new SecondServlet());
        bean.addUrlMappings("/second");
        return bean;
    }
}

• 3、浏览器访问验证：​​http://localhost:8080/second​​



• 
  
• 4、查看控制台输出

本文源码下载：

github地址：
​​​https://github.com/gb-heima/Spring-Boot-Actual-Combat/tree/master/parent/spring-boot-chapter-3​​