timerfilter1.java~2~

来自「过滤器技术的开发与设计。」· JAVA~2~ 代码 · 共 50 行

/**
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author unascribed
 * @version 1.0
 */

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class TimerFilter implements Filter {
  private FilterConfig config = null;

  public void init(FilterConfig config) throws ServletException {
    this.config = config;
  }

  public void destroy() {

    config = null;

  }

  public void doFilter(ServletRequest request, ServletResponse response,

                     FilterChain chain) throws IOException, ServletException {

    long before = System.currentTimeMillis();

    chain.doFilter(request, response);

    long after = System.currentTimeMillis();


    String name = "";

    if (request instanceof HttpServletRequest) {

      name = ((HttpServletRequest)request).getRequestURI();

    }

    config.getServletContext().log(name + ": " + (after - before) + "ms");

  }

}