使用commons-logging的笔记

最新推荐文章于 2024-08-19 19:19:21 发布

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#class #layout #filter #log4j #file #import

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本文介绍如何在Eclipse中配置Log4j与Commons-Logging，包括使用Log4E插件快速创建Logger对象及配置log4j.xml文件来实现不同级别的日志输出。

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commons-logging是Jarkata封装了多种Java Log，如：Log4j、JDK Log、LogKit、NoOpLog、SimpleLog。

Eclipse下可以使用Log4E插件，快速插入Logger对象，设置Log4E的模版为commons-logging模版就可以了。并同时把commons-logging和log4j的jar包至于工程的classpath中。

在一个类MyClass的代码编辑页面，右键选择Log4E，选择declare logger，即在源代码基础上添加如下几段代码，如下：

import org.apache.commons.logging.Log;

import org.apache.commons.logging.LogFactory;

/**

* Logger for this class

private static final Log logger = LogFactory.getLog(MyClass.class);

需要在src目录下添加log4j.xml文件，如下：

<?xml version="1.0" encoding="UTF-8" ?>

<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">

<log4j:configuration>

</layout>

</appender>

</layout>

</filter>

</appender>

</layout>

</filter>

</appender>

</layout>

</filter>

</appender>

</layout>

</filter>

</appender>

<!--

</layout>

</appender>

</layout>

</appender>

</layout>

</appender>

<appender-ref ref="MONITOR" />

</logger>

<appender-ref ref="MONITOR_DAO" />

</logger>

<appender-ref ref="TASK_RUNNING" />

</logger>

-->

<root>

<appender-ref ref="STDOUT" />

<!--

<appender-ref ref="INFO_LOG" />

<appender-ref ref="ERROR_LOG" />

<appender-ref ref="FATAL_LOG" />

-->

</root>

</log4j:configuration>

<!--

Log4J Configuration Quick Reference:

====================================

Priority order is DEBUG < INFO < WARN < ERROR < FATAL

PatternLayout conversion characters:

%c Category of the logging event

%C Fully qualified class name of the caller

%d Date of the logging event (example: %d{HH:mm:ss,SSS} )

%F File name where the logging request was issued (caution: extremely slow)

%l Location information of the caller (caution: extremely slow)

%L Line number from where the logging request was issued (caution: extremely slow)

%m Application-supplied message

%M Method name from where the logging request was issued (caution: extremely slow)

%n Line separator

%p Priority of the logging event

%r Number of milliseconds since the start of the application

%t Name of the thread that generated the logging event

%x Nested diagnotic context associated with the thread

%% A single percent sign

Format modifiers examples:

%20c Left pad with spaces if category is less than 20 characters long

%-20c Right pad with spaces if category is less than 20 characters long

%.30c Truncate from the beginning if category is more than 30 chars long

%20.30c Left pad 20 chars + truncate from beginning if more than 30 chars

%-20.30c Right pad 20 chars + truncate from beginning if more than 30 chars

Examples: "%r [%t] %-5p %c %x - %m "

"%-6r [%15.15t] %-5p %30.30c %x - %m "

-->

大功告成！