package com.songzihao.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;
 
/**
 *
 */
@WebServlet(urlPatterns = "/myservlet")
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 {
        doGet(req, resp);
    }
}

之后在SpringBoot項目的入口類上方使用注解 @ServletComponentScan 注解來掃描Servlet中的注解即可。

package com.songzihao.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletComponentScan;
 
@SpringBootApplication //開啟spring配置
@ServletComponentScan(basePackages = "com.songzihao.springboot.servlet")
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

最后啟動測試。

2.方式二（定義配置類）

仍然是先寫一個 Servlet。這次不使用注解。

package com.songzihao.springboot.servlet;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
 
/**
 *
 */
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 {
        doGet(req, resp);
    }
}

然后再寫一個配置類?。?！

這個類的上方使用 @Configuration 注解，表名該類是一個配置類，相當(dāng)于之前的各種xml配置文件。

在類中的方法上方使用 @Bean 注解，ServletRegistrationBean 這相當(dāng)于是一個Servlet注冊類，類似于之前的 <servlet>、<servlet-mapping> 標(biāo)簽的作用。

package com.songzihao.springboot.config;
import com.songzihao.springboot.servlet.MyServlet;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
 
/**
 *
 */
@Configuration //該注解將此類定義為一個配置類（相當(dāng)于一個xml配置文件）
public class ServletConfig {
 
    /**
     * @Bean 是一個方法級別上的注解，主要用在配置類里
     * 相當(dāng)于一個 <beans>
     *              <bean id="..." class="..." />
     *          </beans>
     * @return
     */
    @Bean
    public ServletRegistrationBean myServletRegistrationBean() {
        ServletRegistrationBean servletRegistrationBean=new ServletRegistrationBean(
                new MyServlet(),"/myservlet"
        );
        return servletRegistrationBean;
    }
}

最后啟動測試。

package com.songzihao.springboot;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
 
@SpringBootApplication
public class Application {
 
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}