Use filters to count URL request time

This is only an optional operation , You can use this operation to see which connection is the most time-consuming , To find out the bottleneck of the system , Solve related performance problems .
To say , The use of filters is simple , There will be no burden here , Mainly about the specific implementation methods .
Here I only print requests that take more than two seconds , And do not process resource requests .

 

The first is configuration web.xml：

<!--  Time consuming statistical filter   Start  --><filter> <filter-name>FilterAll</filter-name> <filter-class>cn.com.vogue.filter.URLFilter</filter-class></filter><filter-mapping> <filter-name>FilterAll</filter-name> <url-pattern>/*</url-pattern></filter-mapping><!--  Time consuming statistical filter   end  -->

 

The second is to write filter code ：

package cn.com.vogue.filter;import java.io.IOException;import java.util.Date;import javax.servlet.Filter;import javax.servlet.FilterChain;import javax.servlet.FilterConfig;import javax.servlet.ServletException;import javax.servlet.ServletRequest;import javax.servlet.ServletResponse;import javax.servlet.http.HttpServletRequest;import org.slf4j.Logger;import org.slf4j.LoggerFactory;public class URLFilter implements Filter{ private static Logger logger = LoggerFactory.getLogger(URLFilter.class); public void destroy() { } public void doFilter(ServletRequest request, ServletResponse response,   FilterChain chain) throws IOException, ServletException {  request.setCharacterEncoding("UTF-8");  response.setCharacterEncoding("UTF-8");  HttpServletRequest httpRequest = (HttpServletRequest)request;  String url = httpRequest.getServletPath();  if(checkUrl(url)){   Date time_begin = new Date();   chain.doFilter(request, response); //  Carry on    Date time_end = new Date();   long i = (long) ((time_end.getTime() - time_begin.getTime())) / 1000;   if(i > 2)    logger.warn("===>>>  The request takes time  " + i + " second  URL：" + url + " <<<===");  }else{      chain.doFilter(request, response); //  Carry on   } } /**  *  First level verification   */ public boolean checkUrl(String url){  boolean isSucc = true;  try {   //  Do not block login requests    if("/login".equals(url)){    return false;   }   int pointIndex = url.lastIndexOf(".");   if(pointIndex > 0){    String relUrl = url.substring(pointIndex, url.length());    if(".css".equals(relUrl)){     return false;    }    if(".jpg".equals(relUrl)){     return false;    }    if(".gif".equals(relUrl)){     return false;    }    if(".png".equals(relUrl)){     return false;    }    if(".ico".equals(relUrl)){     return false;    }    if(".js".equals(relUrl)){     return false;    }    if(".jsp".equals(relUrl)){     return false;    }   }  } catch (Exception e) {   logger.error(" The system made an error in resource level verification ！", e);  }  return isSucc; } public void init(FilterConfig filterConfig) throws ServletException { }}

 

If there is a connection that takes too long to request , Will print time-consuming and connected .

But notice , We received this request , No parameters , Just the path of the specific request .

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