<Valve className="org.apache.catalina.valves.AccessLogValve" directory="logs"
        prefix="localhost_access_log." suffix=".txt"
        pattern="%h %l %u %t &quot;%r&quot; [%{postdata}r] %s %{Referer}i %{User-Agent}i %T %b" />

%a  這是記錄訪問者的IP，在日志里是127.0.0.1 
%A  這是記錄本地服務(wù)器的IP，在日志里是192.168.254.108 
%b  發(fā)送信息的字節(jié)數(shù)，不包括http頭，如果字節(jié)數(shù)為0的話，顯示為- 
%B  發(fā)送信息的字節(jié)數(shù)，不包括http頭。 
%h  服務(wù)器的名稱。如果resolveHosts為false的話，這里就是IP地址了，例如我的日志里是10.217.14.16 
%H  訪問者的協(xié)議，這里是HTTP/1.0 
%l  官方解釋：Remote logical username from identd (可能這樣翻譯：記錄瀏覽者進(jìn)行身份驗(yàn)證時(shí)提供的名字)(always returns '-') 
%m  訪問的方式，是GET還是POST 
%p  本地接收訪問的端口  
%q  比如你訪問的是aaa.jsp?bbb=ccc，那么這里就顯示?bbb=ccc，就是querystring的意思 
%r  First line of the request (method and request URI) 請(qǐng)求的方法和URL 
%s  http的響應(yīng)狀態(tài)碼  
%S  用戶的session ID,這個(gè)session ID大家可以另外查一下詳細(xì)的解釋，反正每次都會(huì)生成不同的session ID 
%t  請(qǐng)求時(shí)間 
%u  得到了驗(yàn)證的訪問者，否則就是"-" 
%U  訪問的URL地址，我這里是/rightmainima/leftbott4.swf 
%v  服務(wù)器名稱，可能就是你url里面寫的那個(gè)吧，我這里是localhost 
%D  Time taken to process the request,in millis，請(qǐng)求消耗的時(shí)間，以毫秒記 
%T  Time taken to process the request,in seconds，請(qǐng)求消耗的時(shí)間，以秒記 

package com.xiaoxiliu  
import java.io.IOException; 
import java.util.Enumeration;  
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 org.slf4j.Logger; 
import org.slf4j.LoggerFactory;  
public final class PostDataDumperFilter implements Filter {  
  Logger logger = LoggerFactory.getLogger(getClass());  
  private FilterConfig filterConfig = null;  
  public void destroy() { 
    this.filterConfig = null; 
  } 
 
  public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) 
      throws IOException, ServletException { 
    if (filterConfig == null) 
      return;  
    Enumeration<String> names = request.getParameterNames(); 
    StringBuilder output = new StringBuilder(); 
    while (names.hasMoreElements()) { 
      String name = (String) names.nextElement(); 
      output.append(name).append("="); 
      String values[] = request.getParameterValues(name); 
      for (int i = 0; i < values.length; i++) { 
        if (i > 0) { 
          output.append("' "); 
        } 
 
        output.append(values[i]); 
      } 
      if (names.hasMoreElements()) 
        output.append("&"); 
    } 
    request.setAttribute("postdata", output); 
    logger.debug("postdata: " + output); 
    chain.doFilter(request, response); 
  } 
 
  public void init(FilterConfig filterConfig) throws ServletException { 
    this.filterConfig = filterConfig; 
  } 
} 

<filter> 
    <filter-name>post-data-dumper-filter</filter-name> 
    <filter-class>com.xiaoxiliu.PostDataDumperFilter</filter-class> 
  </filter> 
  <filter-mapping> 
    <filter-name>post-data-dumper-filter</filter-name> 
    <url-pattern>/*</url-pattern> 
  </filter-mapping>