servlet 的filter,日志文件记录执行时间

原创

v512345 2014-12-07 21:59:04 博主文章分类：编程语言2 ©著作权

文章标签 servlet 的filter 日志文件记录执行时间 文章分类 前端开发

©著作权归作者所有：来自51CTO博客作者v512345的原创作品，请联系作者获取转载授权，否则将追究法律责任

import java.io.IOException;

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;

/**
* 执行时间过滤器
*/
public class ProcessTimeFilter implements Filter {
   protected final Logger log = LoggerFactory
           .getLogger(ProcessTimeFilter.class);
   /**
   * 请求执行开始时间
   */
   public static final String START_TIME = "startTime";

   public void destroy() {
   }

   public void doFilter(ServletRequest req, ServletResponse response,
           FilterChain chain) throws IOException, ServletException {
       HttpServletRequest request = (HttpServletRequest) req;
       long time = System.currentTimeMillis();
       request.setAttribute(START_TIME, time);
       chain.doFilter(request, response);
       time = System.currentTimeMillis() - time;
       log.debug("process in {} ms: {}", time, request.getRequestURI());
   }

   public void init(FilterConfig arg0) throws ServletException {
   }
}

web.xml配置