log4j配置文件介绍（二）
通过扩展FileAppender类的方式，定制属于自己的相对路径起始位置：
1.扩展属于自己的FileAppender类，并重载setFile方法
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public class RelativePathDailyRollingFileAppender extends DailyRollingFileAppender{/** * 获取eclipse的运行时工作空间根路径 */public static String RELATIVE_PATH = Platform.getLocation().toString() + "/";@Overridepublic void setFile(String file) {super.setFile(RELATIVE_PATH+file);}}??
2.改变log4j中的配置项，把Appender实现类换成我们自己的实现类
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#log4j.appender.info=org.apache.log4j.DailyRollingFileAppender
log4j.appender.info=cn.com.agree.abop.ide.logging.appender.RelativePathDailyRollingFileAppender
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通过修改log4j配置文件，使生成的日志根据日志级别保存在多个文件中
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# 按照级别把日志输出到不同的文件log4j.rootLogger=info,stdout,info,debug,errorlog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%nlog4j.logger.info=info#log4j.appender.info=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.info=cn.com.agree.abop.ide.logging.appender.RelativePathDailyRollingFileAppenderlog4j.appender.info.layout=org.apache.log4j.PatternLayoutlog4j.appender.info.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%nlog4j.appender.info.datePattern='.'yyyy-MM-ddlog4j.appender.info.Threshold = INFO log4j.appender.info.append=truelog4j.appender.info.File=.metadata/info.loglog4j.logger.error=errorlog4j.appender.error=cn.com.agree.abop.ide.logging.appender.RelativePathDailyRollingFileAppender#log4j.appender.error=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.error.layout=org.apache.log4j.PatternLayoutlog4j.appender.error.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%nlog4j.appender.error.datePattern='.'yyyy-MM-ddlog4j.appender.error.Threshold = ERROR log4j.appender.error.append=truelog4j.appender.error.File=.metadata/error.log如下是我使用的log4j配置文件的全文：log4j.rootLogger=WARN,CONSOLE,DATABASE,FILElog4j.addivity.org.apache=true# 输出到控制台log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppenderlog4j.appender.CONSOLE.Threshold=INFOlog4j.appender.CONSOLE.Target=System.outlog4j.appender.CONSOLE.Encoding=GBKlog4j.appender.CONSOLE.layout=org.apache.log4j.PatternLayoutlog4j.appender.CONSOLE.layout.ConversionPattern=[framework] %d - %c -%-4r [%t] %-5p %c %x - %m%n# 按照级别把日志输出到不同的文件log4j.rootLogger=info,stdout,info,debug,errorlog4j.appender.stdout=org.apache.log4j.ConsoleAppenderlog4j.appender.stdout.layout=org.apache.log4j.PatternLayoutlog4j.appender.stdout.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%nlog4j.logger.info=info#log4j.appender.info=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.info=cn.com.agree.abop.ide.logging.appender.RelativePathDailyRollingFileAppenderlog4j.appender.info.layout=org.apache.log4j.PatternLayoutlog4j.appender.info.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%nlog4j.appender.info.datePattern='.'yyyy-MM-ddlog4j.appender.info.Threshold = INFO log4j.appender.info.append=truelog4j.appender.info.File=.metadata/info.loglog4j.logger.error=errorlog4j.appender.error=cn.com.agree.abop.ide.logging.appender.RelativePathDailyRollingFileAppender#log4j.appender.error=org.apache.log4j.DailyRollingFileAppenderlog4j.appender.error.layout=org.apache.log4j.PatternLayoutlog4j.appender.error.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%nlog4j.appender.error.datePattern='.'yyyy-MM-ddlog4j.appender.error.Threshold = ERROR log4j.appender.error.append=truelog4j.appender.error.File=.metadata/error.log#log4j.logger.debug=debug#log4j.appender.debug=org.apache.log4j.DailyRollingFileAppender#log4j.appender.debug.layout=org.apache.log4j.PatternLayout#log4j.appender.debug.layout.ConversionPattern=[%-5p] [%d{HH:mm:ss}] %c - %m%n#log4j.appender.debug.datePattern='.'yyyy-MM-dd#log4j.appender.debug.Threshold = DEBUG #log4j.appender.debug.append=true#log4j.appender.debug.File=.metadata/debug.log?