log4j日志输出配置

1.log4j的文件配置：

log4j.rootLogger = debug,stdout,I,E
#### 控制台打印 stdout：标准输出###
#log4j.appender.stdout = org.apache.log4j.ConsoleAppender
#log4j.appender.stdout.Target = System.out
#log4j.appender.stdout.layout = org.apache.log4j.PatternLayout
#log4j.appender.stdout.layout.ConversionPattern = [%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

#### 输出到文件file info ###
log4j.logger.info=I
#log4j.appender.I = org.apache.log4j.DailyRollingFileAppender
log4j.appender.I =com.shopping.test.LogAppender
log4j.appender.I.append = true
log4j.appender.I.Threshold = INFO
log4j.appender.I.datePattern = ‘.‘yyyy-MM-dd‘.log‘
log4j.appender.I.MaxFileSize=100000KB
log4j.appender.I.layout = org.apache.log4j.PatternLayout
log4j.appender.I.File = ${catalina.home}/logs_dk/info.log
log4j.appender.I.layout.ConversionPattern = [%-5p]_%d{yyyy-MM-dd HH:mm:ss} %c - %m%n
log4j.appender.I.encoding=UTF-8

### 记录error 级别的日志###
log4j.logger.error=E
log4j.appender.E = org.apache.log4j.DailyRollingFileAppender
log4j.appender.E.datePattern = ‘.‘yyyy-MM-dd‘.log‘
log4j.appender.E.Append = true
log4j.appender.E.Threshold = ERROR
log4j.appender.E.layout = org.apache.log4j.PatternLayout
#log4j.appender.E.File =/home/logs/error.log
#log4j.appender.E.File =F:\\logs\\dk\\error.log
log4j.appender.E.File = ${catalina.home}/logs_dk/error.log
log4j.appender.E.layout.ConversionPattern = %-d{yyyy-MM-dd HH:mm:ss} [ %t:%r ] - [ %p ] %m%n

2. 重写一个方法类制定自己的输出

package com.shopping.test;

import org.apache.log4j.DailyRollingFileAppender;
import org.apache.log4j.Priority;

public class LogAppender extends DailyRollingFileAppender {
    @Override
    public boolean isAsSevereAsThreshold(Priority priority) {
        // 只判断是否相等，不判断优先级
        return this.getThreshold().equals(priority);
    }
}

我重写这个方法是在info 文件输出时候，过滤输出非Info级别的日志

3.在项目中：

 private static Logger logger = Logger.getLogger(FcodeViewAction.class);

  //logger.info("今日管理");
  //logger.error("今日管理出错");

这样就可以在自己定义的输出位置找要输出的日志文件了

原文地址：https://www.cnblogs.com/wyf-love-dch/p/11090508.html