本文主要是介绍Log4j MDC使用案例，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
转自：http://dacoolbaby.iteye.com/blog/2013781
Log4j MDC使用案例
Java代码 
- import java.io.IOException;
- import java.util.Map;
- import java.util.UUID;
- import javax.servlet.Filter;
- import javax.servlet.FilterChain;
- import javax.servlet.ServletException;
- import javax.servlet.http.HttpServletRequest;
- import javax.servlet.http.HttpServletResponse;
- import org.apache.commons.lang.StringUtils;
- import org.apache.log4j.MDC;
- import org.springframework.web.filter.OncePerRequestFilter;
- /**
- * 存放在MDC中的数据，log4j可以直接引用并作为日志信息打印出来.
- *
- * <pre>
- * 示例使用:
- * log4j.appender.stdout.layout.conversionPattern=%d [%X{loginUserId}/%X{req.remoteAddr}/%X{req.id} - %X{req.requestURI}?%X{req.queryString}] %-5p %c{2} - %m%n
- * </pre>
- * @author badqiu
- */
- public class LoggerMDCFilter extends OncePerRequestFilter implements Filter{
- protected void doFilterInternal(HttpServletRequest request,HttpServletResponse response, FilterChain chain)throws ServletException,IOException {
- try {
- //示例为一个固定的登陆用户,请直接修改代码
- MDC.put("loginUserId", "demo-loginUsername");
- MDC.put("req.requestURI", StringUtils.defaultString(request.getRequestURI()));
- MDC.put("req.queryString", StringUtils.defaultString(request.getQueryString()));
- MDC.put("req.requestURIWithQueryString", request.getRequestURI() + (request.getQueryString() == null ? "" : "?"+request.getQueryString()));
- MDC.put("req.remoteAddr", StringUtils.defaultString(request.getRemoteAddr()));
- //为每一个请求创建一个ID，方便查找日志时可以根据ID查找出一个http请求所有相关日志
- MDC.put("req.id", StringUtils.remove(UUID.randomUUID().toString(),"-"));
- chain.doFilter(request, response);
- }finally {
- clearMDC();
- }
- }
- private void clearMDC() {
- Map map = MDC.getContext();
- if(map != null) {
- map.clear();
- }
- }
- }
log4j.properties
Properties代码
- log4j.appender.logfile.layout.ConversionPattern=%X{userId} %d{yyyy-MM-dd HH:mm:ss} %p %l %m
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