springboot使用过滤器Filter

先创建过滤器配置类：

## 引入的包部分省略...

@Configuration
public class FilterConfig {
      @SuppressWarnings({"rawtypes", "unchecked"})
      @Bean
      public FilterRegistrationBean registFilter() {
           FilterRegistrationBean registration = new FilterRegistrationBean();
           registration.setFilter(this.SzlDemoFiler());
           registration.addUrlPatterns("/demo/*");
           registration.setName("JimmyShan");
           registration.setOrder(1);
           return registration;
      }

      @Bean
      public Filter SzlDemoFilter() {
           return new SzlDemoFilter();
      }

}

然后，我们自定义类实现Filter接口：

## 引入的包部分省略...

public class SzlDemoFilter implements Filter {
     private final static Logger log = LoggerFactory.getLogger(SzlDemoFilter.class);
     //@Autowired
     //private DemoService demoService;

    @Override
    public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
         long start = System.currentTimeMillis();
         HttpServletRequest req = (HttpServletRequest) request;
         HttpServletResponse resp = (HttpServletResponse) response;

         String methodName = req.getMethod();
         log.info("Request method is : " + methodName);
         String uri = req.getRequestURI();
         log.info("Request uri is : " + uri);

         chain.doFilter(request, response);
         log.info("Execute filter = " + (System.currentTimeMillis() - start) + " ms");
    } 

}