1、自定义LogFileAppender类，继承DailyRollingFileAppender，实现Log4j按级别输出日志到不同文件。
package com.liying.mango.common.interceptor;
import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.Priority;
public class LogFileAppender extends DailyRollingFileAppender {
@Override
public boolean isAsSevereAsThreshold(Priority priority) {
return this.getThreshold().equals(priority);
}
}
2、log4j.properties配置文件
log4j.rootLogger=info, stdout, info, error, fileout
## 定义控制台日志管理器
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%-5p %d %t] %l **** %m%n
## 定义INFO和ERROR级别文件输出日志管理器
log4j.appender.fileout=org.apache.log4j.DailyRollingFileAppender
log4j.appender.fileout.File=/usr/logs/pear/all.log
log4j.appender.fileout.layout=org.apache.log4j.PatternLayout
log4j.appender.fileout.layout.ConversionPattern=[%-5p %d %t] %l **** %m%n
## 定义INFO级别文件输出日志管理器
log4j.logger.info=com.liying.mango.common.interceptor.LogFileAppender
## 每天产生一个日志文件，将日志信息输出到一个日志文件，并且每天输出到一个新的日志文件
log4j.appender.info=org.apache.log4j.DailyRollingFileAppender
log4j.appender.info.layout=org.apache.log4j.PatternLayout
log4j.appender.info.layout.ConversionPattern=[%-5p %d %t] %l **** %m%n
log4j.appender.info.datePattern='.'yyyy-MM-dd
log4j.appender.info.Threshold = INFO
log4j.appender.info.append=true
log4j.appender.info.File=/usr/logs/pear/info.log
## 定义ERROR级别文件输出日志管理器
log4j.logger.error=com.liying.mango.common.interceptor.LogFileAppender
log4j.appender.error=org.apache.log4j.DailyRollingFileAppender
log4j.appender.error.layout=org.apache.log4j.PatternLayout
log4j.appender.error.layout.ConversionPattern=[%-5p %d %t] %l **** %m%n
log4j.appender.error.datePattern='.'yyyy-MM-dd
log4j.appender.error.Threshold = ERROR
log4j.appender.error.append=true
log4j.appender.error.File=/usr/logs/pear/error.log