以前编写配置Servlet

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

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

SpringBoot 整合Servlet方式一

通过注解扫描完成Servlet组件的注册

• 编写Servlet

package com.neuedu.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* SpringBoot 整合Servlet方式一
* @author 清水三千尺
*
*/
@WebServlet(name="FristServlet",urlPatterns="/frist")
public class FristServlet extends HttpServlet{
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      System.out.println("FristServlet运行了。。。。。。");
  }
}

• 编写启动类

package com.neuedu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
/**
* SpringBoot 启动类
* @author 清水三千尺
*
*/
@SpringBootApplication
@ServletComponentScan //在SpringBoot启动时会扫描>@WebServlet，并将该类实例化
public class App {
  public static void main(String[] args) throws Exception {
      SpringApplication.run(App.class, args);
  }
}

• 启动测试

浏览器访问：http://localhost:8080/frist

控制台结果：

SpringBoot 整合Servlet方式二

通过方法完成Servlet组件的注册

• 编写Servlet

package com.neuedu.servlet;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
* SpringBoot 整合Servlet方式二
* @author 清水三千尺
*
*/
@WebServlet(name="SecondServlet",urlPatterns="/second")
public class SecondServlet extends HttpServlet{
  @Override
  protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
      System.out.println("SecondServlet运行了。。。。。。");
  }
}

• 编写启动类

package com.neuedu;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;

import com.neuedu.servlet.SecondServlet;
/**
* SpringBoot 启动类
* @author 清水三千尺
*
*/
@SpringBootApplication
public class App2 {
  public static void main(String[] args) throws Exception {
      SpringApplication.run(App2.class, args);
  }
  
  @Bean
  public ServletRegistrationBean<SecondServlet> getServletRegistrationBean() {
      //完成SecondServlet的注册
      ServletRegistrationBean<SecondServlet> bean = new ServletRegistrationBean<SecondServlet>(new SecondServlet());
      //完成url的指定
      bean.addUrlMappings("/second");
      return bean;
  }
}

• 启动测试

浏览器访问：http://localhost:8080/second

控制台结果：