SpringBoot学习总结（5）之整合Servlet

我就是我 2022-02-23 13:56 305阅读 0赞

# 一、环境 #

Maven 3.6.0
    IDEA IntelliJ IDEA 2017.2.6 x64
    JDK 1.8
    Spring Boot 1.5.4.RELEASE

# 二、pom配置 #

<dependency>
    			<groupId>org.springframework.boot</groupId>
    			<artifactId>spring-boot-starter-web</artifactId>
    </dependency>

# 三、通过注解扫描完成Servlet 组件的注册 #

首先编写我们的servlet类。

package com.mqc.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;
    
    /**
     * @author maoqichuan
     * @ClassName: FirstServlet
     * @description: 通过注解扫描的方式注册servlet
     * @date 2019-04-0814:10
     *
     * 回顾一下我们普通servlet的开发流程
     * 1。首先要自定义一个类实现HttpServlet
     * 2.然后需要在web.xml中注册我们的servlet
     *<servlet>
     * <servlet-name>FirstServlet</servlet-name>
     * <servlet-class>com.bjsxt.servlet.FirstServlet</servlet-class>
     *</servlet>
     *
     *<servlet-mapping>
     * <servlet-name>FirstServlet</servlet-name>
     * <url-pattern>/first</url-pattern>
     *</servlet-mapping>
     **/
    @WebServlet(name = "FirstServlet",urlPatterns = "/first")
    public class FirstServlet extends HttpServlet {
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            // 处理get请求
            System.out.print("处理get请求");
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            // 处理post请求
            System.out.print("处理post请求");
        }
    }

@WebServlet这个注解用来实现serlvet跟url的映射。上面定义的这个servlet的名字在name属性中标记了为：FirstServlet，urlPatterns指定的是对应的映射路径，

启动类：

package com.mqc;
    
    import org.mybatis.spring.annotation.MapperScan;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletComponentScan;
    import org.springframework.transaction.annotation.EnableTransactionManagement;
    
    @SpringBootApplication
    @EnableTransactionManagement // 开启事务管理
    //在对应的mapper类加上@mapper注解就不用去扫
    @ServletComponentScan
    public class SpringbootMybatisApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SpringbootMybatisApplication.class, args);
    	}
    
    }

@ServletComponentScan在springBoot 启动时会扫描@WebServlet，并将该类实例化，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。

启动项目，调用对应的servlet：[http://localhost:8080/first][http_localhost_8080_first]

![20190408155957111.png][]

![20190408160017347.png][]

这样子，我们通过注解扫描的方式注册servlet的方式就已经是调试成功了，接下来我们学习第二种方式整合servlet的方式。

# 四、通过方法完成Servlet 组件的注册 #

第一个首先编写我们的servlet类。

package com.mqc.servlet;
    
    import javax.servlet.ServletException;
    import javax.servlet.http.HttpServlet;
    import javax.servlet.http.HttpServletRequest;
    import javax.servlet.http.HttpServletResponse;
    import java.io.IOException;
    
    /**
     * @author maoqichuan
     * @ClassName: MyServlet
     * @description: 通过方法注册servlet
     * @date 2019-04-0816:01
     **/
    public class MyServlet extends HttpServlet {
        @Override
        protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.print("------MyServlet-------处理get请求");
        }
    
        @Override
        protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
            System.out.print("------MyServlet-------处理post请求");
        }
    }

编写我们的启动类：

package com.mqc;
    
    
    import com.mqc.servlet.MyServlet;
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.boot.web.servlet.ServletRegistrationBean;
    import org.springframework.context.annotation.Bean;
    
    /**
     * @description: springboot整合servlet方式二---通过方式注册servlet
     * @author maoqichuan
     * @date 2019-04-08 16:17
     */
    @SpringBootApplication
    public class SpringbootMybatisApplication {
    
    	public static void main(String[] args) {
    		SpringApplication.run(SpringbootMybatisApplication.class, args);
    	}
    
    
    	@Bean
    	public ServletRegistrationBean getRegistrationBean(){
    		ServletRegistrationBean bean = new ServletRegistrationBean(new MyServlet());
    
    		bean.addUrlMappings("myServlet");
    		return bean;
    	}
    }

启动springboot，调试：[http://localhost:8080/myServlet][http_localhost_8080_myServlet]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2pva2VNcWM_size_16_color_FFFFFF_t_70][]

到这里，springboot整合servlet的两种方式已经说完了，大家有什么问题可以留言或者私信我，让我们大家一起进步，一起努力！加油

[http_localhost_8080_first]: http://localhost:8080/first
[20190408155957111.png]: /images/20220223/18ce02063b664204871f0c957fe760a7.png
[20190408160017347.png]: /images/20220223/f7d11e1837b942f1ae9064728366fa2e.png
[http_localhost_8080_myServlet]: http://localhost:8080/myServlet
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2pva2VNcWM_size_16_color_FFFFFF_t_70]: /images/20220223/223098ea87e5463fb2c0a6f9acfd9490.png