spring-boot整合filter和listener

忘是亡心i 2022-04-13 06:42 201阅读 0赞

# spring-boot整合filter和listener #

github源码：[https://github.com/superRabbitMan/spring-bood-filter-listener][https_github.com_superRabbitMan_spring-bood-filter-listener]

filter和listener的整合方式有多种，在没有使用spring-boot之前，习惯使用web.xml配置文件中配置filter和listener。但是在spring-boot中推荐去配置，所有这里使用注解的方式将spring-boot和filter/listener整合。

## 项目结构 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzMyMzY2MzI5_size_16_color_FFFFFF_t_70][]

## 引入依赖 ##

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

## 创建Filter，并添加注解 ##

@WebFilter(filterName = "myFilter", urlPatterns = "/*")
    public class MyFilter implements Filter{
    
        private static final Logger LOG = LoggerFactory.getLogger(MyFilter.class);
    
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            LOG.info("MyFilter init method");
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            LOG.info("MyFilter doFilter method");
        }
    
        @Override
        public void destroy() {
            LOG.info("MyFilter destroy method");
        }
    }

## 创建Listener，并添加注解 ##

@WebListener
    public class MyListener implements ServletContextListener {
    
        private static final Logger LOG = LoggerFactory.getLogger(MyListener.class);
    
        @Override
        public void contextInitialized(ServletContextEvent sce) {
            LOG.info("MyListener contextInitialized method");
        }
    
        @Override
        public void contextDestroyed(ServletContextEvent sce) {
            LOG.info("MyListener contextDestroyed method");
        }
    }

## Application类添加扫描Servlet功能 ##

@Controller
    @SpringBootApplication
    @ServletComponentScan(basePackages = {"com.example.demo.filter", "com.example.demo.listener"})//添加servlet扫描
    public class SpringBoodFilterListenerApplication {
    
       public static void main(String[] args) {
          SpringApplication.run(SpringBoodFilterListenerApplication.class, args);
       }
    
       @RequestMapping(value = "/test")
       public void testFilterAndListener() {
    
       }
    
    }

最后启动项目打开浏览器访问[http://localhost:8080/test][http_localhost_8080_test]就可以看到打印的日志

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**![20190711001357188.jpg][]**

[https_github.com_superRabbitMan_spring-bood-filter-listener]: https://github.com/superRabbitMan/spring-bood-filter-listener
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3NpbmF0XzMyMzY2MzI5_size_16_color_FFFFFF_t_70]: /images/20220413/47b354daa1914871897539bfbead7be4.png
[http_localhost_8080_test]: http://localhost:8080/test
[20190711001357188.jpg]: https://img-blog.csdnimg.cn/20190711001357188.jpg