如何配置使用 Log4j

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1、下载：

http://archive.apache.org/dist/logging/log4j/

2、添加jar到java项目：

3、创建：Log4j.Properties文件，放在src文件夹下即可：

  3.1 输出到console端：

# Root logger option
log4j.rootLogger=INFO, stdout
 
# Direct log messages to stdout 
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=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

   3.2 输出到日志文件：

# Root logger option
log4j.rootLogger=INFO, file
 
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C:\\loging.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

  3.3 输出到console同时输出到日志文件：

# Root logger option
log4j.rootLogger=INFO, file, stdout
 
# Direct log messages to a log file
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C:\\loging.log
log4j.appender.file.MaxFileSize=1MB
log4j.appender.file.MaxBackupIndex=1
log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n
 
# Direct log messages to stdout
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=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

  3.4  按天roll over（翻滚，转存）日志：

# Root logger option
log4j.rootLogger=INFO,console,dailyFile
##Daily log:
log4j.appender.dailyFile=org.apache.log4j.DailyRollingFileAppender
log4j.appender.dailyFile.File=e:/ftplog/autoftp.log
log4j.appender.dailyFile.Append=true
log4j.appender.dailyFile.layout=org.apache.log4j.PatternLayout  
log4j.appender.dailyFile.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p - %m%n
log4j.appender.dailyFile.Threshold=INFO
log4j.appender.dailyFile.DatePattern=‘.‘yyyy-MM-dd  

# Direct log messages to console
log4j.appender.console=org.apache.log4j.ConsoleAppender
log4j.appender.console.Threshold=INFO
log4j.appender.console.ImmediateFlush=true
log4j.appender.console.Target=System.out
log4j.appender.console.layout=org.apache.log4j.PatternLayout
log4j.appender.console.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

 PS：

Debug Level:  日志记录等级

We have used DEBUG with both the appenders. All the possible options are:

• TRACE

• DEBUG

• INFO

• WARN

• ERROR

• FATAL

• ALL

Daily Log File Generation: 每日文件生成模式

 4、测试代码如下：

[java] view plain copy

 

 

1. import org.apache.log4j.Logger;  
2.     import org.apache.log4j.BasicConfigurator;  
3.       
4.     public class Hello {  
5.       
6.       static Logger logger = Logger.getLogger(Hello.class);  
7.       
8.       public  
9.       static  
10.       void main(String argv[]) {  
11.         BasicConfigurator.configure();  
12.         logger.debug("Hello world.");  
13.         logger.info("What a beatiful day.");  
14.       }  
15.     }  

Output：

2013-12-14 13:02:06 ERROR Hello:12 - Hello world.
2013-12-14 13:02:06 INFO  Hello:13 - What a beatiful day.

----------------------------------------

Dylan   presents.

如何配置使用 Log4j

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原文地址：http://www.cnblogs.com/huaxingtianxia/p/5605793.html