log4j是一个用Java编写的可靠,快速和灵活的日志框架(API),它在Apache软件许可下发布。 

 

Log4j已经被移植到了C,C++,C#,Perl,Python和Ruby等语言中。

 

Log4j是高度可配置的,并可通过在运行时的外部文件配置。它根据记录的优先级别,并提供机制,以指示记录信息到许多的目的地,诸如:数据库,文件,控制台,UNIX系统日志等。

Log4j中有三个主要组成部分:

  • loggers: 负责捕获记录信息。

  • appenders : 负责发布日志信息,以不同的首选目的地。

  • layouts: 负责格式化不同风格的日志信息。

log4j的历史

  • 始于1996年初的E.U. SEMPER (安全电子市场为欧洲)跟踪API的项目。

  • 不计其数的改进,在几个大量的工作之后,API已经发展成为log4j,一个流行的日志记录包为Java。

  • 该软件包是Apache软件许可证,由开源认证是一个不折不扣的开源许可证下发布。

  • 最新log4j的版本,包括完整的源代码,类文件和文档可以在这里找到 http://logging.apache.org/log4j/.

log4j 特性:

  • log4j的是线程安全的

  • log4j是经过优化速度的

  • log4j是基于一个名为记录器的层次结构

  • log4j的支持每个记录器多输出追加器(appender)

  • log4j支持国际化。

  • log4j并不限于一组预定义的设备

  • 日志行为可以使用配置文件在运行时设置

  • log4j设计从一开始就是处理Java异常

  • log4j使用多个层次,即ALL,TRACE,DEBUG,INFO,WARN,ERROR和FATAL

  • 日志输出的格式可以通过扩展Layout类容易地改变

  • 日志输出的目标,以及在写入策略可通过实现Appender程序接口改变

  • log4j 会故障停止。然而,尽管它肯定努力确保传递,log4j不保证每个日志语句将被传递到目的地。

日志记录N个缺点及优点:

日志是软件开发的重要组成部分。一个精心编写的日志代码提供快速的调试,维护方便,以及应用程序的运行时信息结构化存储。

日志记录确实也有它的缺点。它可以减缓的应用程序。如果太详细,它可能会导致滚动失明。为了减轻这些影响,log4j被设计为是可靠,快速和可扩展。

由于记录很少为应用的主要重点,但log4j API致力于成为易于理解和使用。


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