Log4j动态输出日志

项目中有这么一个需求，要求对要对指定包的所有下一级包的类进行日志隔离。如要对package1的下级包进行日志隔离，然后有package1.subpackage1,package1.subpackage2........等包，需要将subpackage1下所有类(包括所有下级包的类)产生的日志输出到subpackage1.log文件中，subpackage2下的日志输出到subpackage2.log中。问过一些同事，也在网上问过一些朋友，最终找到了解决方案，重写一个Appender。所有代码如下：

DynamicWtriteLogAppender.java

package com.xiaoyf.loger
import java.text.MessageFormat;

import org.apache.log4j.Category;
import org.apache.log4j.Logger;
import org.apache.log4j.helpers.LogLog;
import org.apache.log4j.spi.LocationInfo;
import org.apache.log4j.spi.LoggingEvent;

/**
 * 
 * @author xiaoYF
 *
 */
public class DynamicWtriteLogAppender extends FileAppender{
	
	/**
	 * 输出日志方式
	 */
	private int type = 0;
	
	/**
	 * 设置日志输出方式
	 * @param type </br>
	 *        <strong>0:</strong>将日志统一输出到以当前Logger的别名为文件名的文件中，</br>
	 *          如配置为：log4j.category.package1 = info , package1,日志就都输出到package1.log中</br>
	 *        <strong>1：</strong>按下级包分别输出么各自的文件中</br>
	 *          如配置为：log4j.category.package1 = info , package1,</br>
	 *          日志是由package1.subpackage1包下的类（包括下级包的类）产生的产生的，日志统一输出到</br>
	 *          subpackage1.log中</br>
	 *        <strong>2：</strong>按包输出日志，如配置为：log4j.category.package1 = info , package1,</br>
	 *          日志是由package1.subpackage1.package1包下的类产生的产生的日志统一输出到package1.log中,</br>
	 *          package1.subpackage1下包下的类产生的产生的日志统一输出到subpackage1.log中</br>
	 *        <strong>3：</strong>按类输出日志，不同的类输出到以各自类名为文件名的日志文件中</br>
	 */
	public void setType(int type){
		this.type = type;
	}
	
	public int getType(){
		return type;
	}
	
	private String outFileName;
	public String getOutFileName() {
		return outFileName;
	}

	public void setOutFileName(String outFileName) {
		this.outFileName = outFileName;
	}
	
	public DynamicWtriteLogAppender(){
	}
	
	private synchronized void apendLog(String fileName,LoggingEvent event)  {
		try {
			String oldFileName = this.getFile();
			super.setFile(fileName);
			super.activateOptions();
			super.subAppend(event);
			super.setFile(oldFileName);
		} catch (Exception e) {
			LogLog.error("append log error",e);
		}
	}
	
	protected void subAppend(LoggingEvent event) {
		
		String outPutTagFile = null;
		if(getType() == 0){
			outPutTagFile = getName();
		}
		else
		{
			String logName = event.getLoggerName();//日志名
			LocationInfo locationInfo = event.getLocationInformation();
			String className = null != locationInfo ? locationInfo.getClassName() : logName;
			String simpleClassName = className.substring(className.lastIndexOf(".")+1);
			if(getType() == 3){
				outPutTagFile = simpleClassName;
			}
			else{
				Category parentPogger = Logger.getLogger(logName).getParent();
				String parentLogName = null != parentPogger ? parentPogger.getName() : logName;//此 Logger 的父 logger名称
				String subPackage = className.replace(parentLogName, "").replaceFirst("\\.","");
				String[] packStructure = subPackage.split("\\.");
				int structLenth = packStructure.length;
				if(getType() == 1){
					outPutTagFile = structLenth > 1?packStructure[0]:null;
				}
				else{
					outPutTagFile = structLenth > 1?packStructure[structLenth-1]:null;
				}
			}
			

		}
		/**
		 * 如果最后得到的日志输出目标名为null,日志输出到默认的文件中
		 */
		MessageFormat formatter = new MessageFormat(null == outPutTagFile?getFile():getOutFileName());
		apendLog(formatter.format(new String[]{outPutTagFile}),event);
		
	}
}

LOG4J配置文件 log4j.properties

log4j.category.com.xiaoyf.plugin = info, plugin
log4j.additivity.com.seeyon.v3x.plugin = false

log4j.appender.plugin = com.xiaoyf.loger.DynamicWtriteLogAppender
log4j.appender.plugin.outFileName = ${A8ApplicationRoot}/logs/{0}.log
log4j.appender.plugin.file = ${A8ApplicationRoot}/logs/plugin.log
log4j.appender.plugin.layout = org.apache.log4j.PatternLayout
log4j.appender.plugin.layout.ConversionPattern = %d{yyyy-MM-dd HH:mm:ss} [%t] %5p %c{1}:%L - %m%n
log4j.appender.plugin.append = true
log4j.appender.plugin.type = 1

评论

1 楼 laitaogood 2010-09-09  

这个确实不错，哈哈