如何配置使用 Log4j

淩亂°似流年 2022-08-27 06:56 6阅读 0赞

**最近在用Java 写一个FTP上传下载文件工具，正好需要产生操作日志。**

**利用Log4j.jar可以轻松解决。下面介绍一下Log4j的使用，具体概念到官网查阅：**

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**1、下载：**

[http://archive.apache.org/dist/logging/log4j/][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 ##

<table style="color:rgb(0,0,0); font-family:Arial; font-size:14px; line-height:26px; orphans:2; widows:2"> 
 <tbody style="margin:0px; padding:0px"> 
  <tr style="margin:0px; padding:0px"> 
   <th style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214); background-color:rgb(238,238,238); width:185px"> DatePattern</th> 
   <th style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214); background-color:rgb(238,238,238)"> Description</th> 
  </tr> 
  <tr style="margin:0px; padding:0px"> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> '.' yyyy-MM</td> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> Roll over at the end of each month and the beginning of the next month.</td> 
  </tr> 
  <tr style="margin:0px; padding:0px"> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> '.' yyyy-MM-dd</td> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> This is the default value and roll over at midnight each day.</td> 
  </tr> 
  <tr style="margin:0px; padding:0px"> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> '.' yyyy-MM-dd-a</td> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> Roll over at midday and midnight of each day.</td> 
  </tr> 
  <tr style="margin:0px; padding:0px"> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> '.' yyyy-MM-dd-HH</td> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> Roll over at the top of every hour.</td> 
  </tr> 
  <tr style="margin:0px; padding:0px"> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> '.' yyyy-MM-dd-HH-mm</td> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> Roll over every minute.</td> 
  </tr> 
  <tr style="margin:0px; padding:0px"> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> '.' yyyy-ww</td> 
   <td style="margin:0px; padding:5px; border-collapse:collapse; border:1px solid rgb(214,214,214)"> Roll over on the first day of each week depending upon the locale.</td> 
  </tr> 
 </tbody> 
</table>

** 4、测试代码如下：**

**\[java\]**  [view plain][] [copy][view plain] [![在CODE上查看代码片][CODE]][CODE_CODE] [![派生到我的代码片][ico_fork.svg]][ico_fork.svg 1]

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.

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！

[http_archive.apache.org_dist_logging_log4j]: http://archive.apache.org/dist/logging/log4j/
[view plain]: http://blog.csdn.net/indexman/article/details/17318817#
[CODE]: 
[CODE_CODE]: https://code.csdn.net/snippets/112001
[ico_fork.svg]: https://code.csdn.net/assets/ico_fork.svg
[ico_fork.svg 1]: https://code.csdn.net/snippets/112001/fork