SpringBoot中如何集成Servlet呢？

实现思路:
    方式1：
       使用全注解的方式开发
	    1.1 在启动类上面加上注解 @ServletComponentScan 
		1.2 编写Servlet程序，并在Servlet程序上加上注解 @WebServlet(name="testServlet1",urlPatterns = "/test")
 	方式2:
	   直接编写一个@Configuration类
	   将Servlet程序使用ServletRegistrationBean注册到Springboot中

//启动类上加入Servlet扫描注解
@SpringBootApplication
@ServletComponentScan
public class SpringbootservletApplication {
    public static void main(String[] args) {
        SpringApplication.run(SpringbootservletApplication.class, args);
    }
}

//编写Servlet类
@WebServlet(name="testServlet1",urlPatterns = "/test")
public class TestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("java265.com 提醒你 -servlet已经开始运行");
    }
}
-----采用以上方式编写代码后，我们可以使用
http://localhost:8080/test访问servlet了

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

//编写servlet
public class TestServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        System.out.println("java265.com 提醒你 -servlet已经开始运行");
    }
}

//编写configuration类
package com.java265;
import com.adeal.servlet.TestServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
@Configuration
public class ServletConfig {
    /*
    * 多个Servlet 需实例化多个ServletRegistrationBean实例
    * */
    @Bean
    public ServletRegistrationBean getServletRegistrationBean() {
        ServletRegistrationBean bean = new ServletRegistrationBean(new TestServlet());
		//Servlet既可以使用 test01也可以使用test02访问
        bean.addUrlMappings("/test02"); 
        bean.addUrlMappings("/test01");
        return bean;
    }
}
-------编写以上代码后，我们可以使用----
http://localhost:8080/test01 访问servlet了
http://localhost:8080/test02 访问servlet了