SpringBoot实战之6 注册filter和listener

绝地灬酷狼 2022-06-04 04:55 218阅读 0赞

## 应用场景 ##

在项目中有些特殊的处理需要用到过滤器及监听器，比如spring框架得字符过滤器CahracterEncodingFilter。

## code实现 ##

MyFilter.java

@WebFilter(urlPatterns = "/*",description = "自定义filter")
    public class MyFilter implements Filter { 
        private final Logger _logger = LoggerFactory.getLogger(this.getClass());
        @Override
        public void init(FilterConfig filterConfig) throws ServletException {
            _logger.info("MyFilter init ...");
        }
    
        @Override
        public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
            _logger.info("处理 filter 业务 ...");
            filterChain.doFilter(servletRequest,servletResponse);
        }
    
        @Override
        public void destroy() {
            _logger.info("MyFilter destroy ...");
        }
    }

MyListener.java

@WebListener
    public class MyListener implements ServletContextListener { 
        private final Logger _logger = LoggerFactory.getLogger(this.getClass()) ;
        @Override
        public void contextInitialized(ServletContextEvent servletContextEvent) {
            _logger.info("contextInitialized");
            _logger.info(servletContextEvent.getServletContext().getContextPath());
        }
        @Override
        public void contextDestroyed(ServletContextEvent servletContextEvent) {
            _logger.info("contextDestroyed");
        }
    }

程序入口 SpringBootFilterListenerApplication.java

@SpringBootApplication
    @ServletComponentScan({
            "com.hsy.springboot.filter.listener.filter",
            "com.hsy.springboot.filter.listener.listener"
    })
    public class SpringBootFilterListenerApplication { 
        public static void main(String[] args) {
            SpringApplication.run(SpringBootFilterListenerApplication.class,args);
        }
    }

结果展示

![这里写图片描述][SouthEast]

项目结构图

![这里写图片描述][SouthEast 1]

## 历史文章 ##

[SpringBoot实战之入门][SpringBoot]

[springboot实战之文章汇总][springboot]

[springboot实战之读取配置文件][springboot 1]

[springboot实战之整合jsp模版引擎][springboot_jsp]

[springboot实战之整合freemarker模版引擎][springboot_freemarker]

[springboot实战之注册自定义Servlet][springboot_Servlet]

[SouthEast]: /images/20220604/a3e99d2263504cb9a6bbd742baecc08a.png
[SouthEast 1]: /images/20220604/0e82c4f923db4b38bc8d002b62703afc.png
[SpringBoot]: http://blog.csdn.net/u012806787/article/details/78694912
[springboot]: http://blog.csdn.net/u012806787/article/details/78686998
[springboot 1]: http://blog.csdn.net/u012806787/article/details/78583814
[springboot_jsp]: http://blog.csdn.net/u012806787/article/details/78700999
[springboot_freemarker]: http://blog.csdn.net/u012806787/article/details/78706156
[springboot_Servlet]: http://blog.csdn.net/u012806787/article/details/78710113