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log4j xml配置详解
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http://zhangxiang390.iteye.com/blog/258455
熟讀一個典型的log4j配置文件：
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Xml代碼 ?
<? xml version "1.0" encoding "UTF-8" ?> <!DOCTYPE?log4j:configuration?SYSTEM?"log4j.dtd"> ?? ?? < log4j:configuration xmlns:log4j 'http://jakarta.apache.org/log4j/' > ?? ?? ????< appender name "myConsole" class "org.apache.log4j.ConsoleAppender" > ????????< layout class "org.apache.log4j.PatternLayout" > ????????????< param name "ConversionPattern" ????????????????value "[%d{dd?HH:mm:ss,SSS\}?%-5p]?[%t]?%c{2\}?-?%m%n" /> ????????</ layout > ?????????? ????????< filter class "org.apache.log4j.varia.LevelRangeFilter" > ????????????< param name "levelMin" value "debug" /> ????????????< param name "levelMax" value "warn" /> ????????????< param name "AcceptOnMatch" value "true" /> ????????</ filter > ????</ appender > ?? ????< appender name "myFile" class "org.apache.log4j.RollingFileAppender" > ????????< param name "File" value "D:/output.log" /> ?????????? ????????< param name "Append" value "true" /> ????????< param name "MaxBackupIndex" value "10" /> ????????< layout class "org.apache.log4j.PatternLayout" > ????????????< param name "ConversionPattern" value "%p?(%c:%L)-?%m%n" /> ????????</ layout > ????</ appender > ? ?? ????< appender name "activexAppender" class "org.apache.log4j.DailyRollingFileAppender" > ????????< param name "File" value "E:/activex.log" /> ????????< param name "DatePattern" value "'.'yyyy-MM-dd'.log'" /> ????????< layout class "org.apache.log4j.PatternLayout" > ?????????< param name "ConversionPattern" ????????????value "[%d{MMdd?HH:mm:ss?SSS\}?%-5p]?[%t]?%c{3\}?-?%m%n" /> ????????</ layout > ????</ appender > ?? ?? ?????? ????< logger name "com.runway.bssp.activeXdemo" additivity "false" > ????????< priority value "info" /> ????????< appender-ref ref "activexAppender" /> ????</ logger > ?? ?????? ????< root > ????????< priority value "debug" /> ????????< appender-ref ref "myConsole" /> ????????< appender-ref ref "myFile" /> ????</ root > </ log4j:configuration >
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd"><log4j:configuration xmlns:log4j='http://jakarta.apache.org/log4j/' ><appender name="myConsole" class="org.apache.log4j.ConsoleAppender"><layout class="org.apache.log4j.PatternLayout"><param name="ConversionPattern" value="[%d{dd HH:mm:ss,SSS\} %-5p] [%t] %c{2\} - %m%n" /></layout><!--過濾器設置輸出的級別--><filter class="org.apache.log4j.varia.LevelRangeFilter"><param name="levelMin" value="debug" /><param name="levelMax" value="warn" /><param name="AcceptOnMatch" value="true" /></filter></appender><appender name="myFile" class="org.apache.log4j.RollingFileAppender"> <param name="File" value="D:/output.log" /><!-- 設置日志輸出文件名 --><!-- 設置是否在重新啟動服務時，在原有日志的基礎添加新日志 --><param name="Append" value="true" /><param name="MaxBackupIndex" value="10" /><layout class="org.apache.log4j.PatternLayout"><param name="ConversionPattern" value="%p (%c:%L)- %m%n" /></layout></appender><appender name="activexAppender" class="org.apache.log4j.DailyRollingFileAppender"><param name="File" value="E:/activex.log" /> <param name="DatePattern" value="'.'yyyy-MM-dd'.log'" /> <layout class="org.apache.log4j.PatternLayout"><param name="ConversionPattern" value="[%d{MMdd HH:mm:ss SSS\} %-5p] [%t] %c{3\} - %m%n" /></layout> </appender><!-- 指定logger的設置，additivity指示是否遵循缺省的繼承機制--><logger name="com.runway.bssp.activeXdemo" additivity="false"><priority value ="info"/> <appender-ref ref="activexAppender" /> </logger><!-- 根logger的設置--><root><priority value ="debug"/><appender-ref ref="myConsole"/><appender-ref ref="myFile"/> </root>
</log4j:configuration>
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(1). 輸出方式appender一般有5種：
???????????? org.apache.log4j.RollingFileAppender(滾動文件，自動記錄最新日志)
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(2). 日記記錄的優先級priority，優先級由高到低分為
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(3). 格式說明layout中的參數都以%開始，后面不同的參數代表不同的格式化信息（參數按字母表順序列出）：
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============
http://jessehu.wordpress.com/2009/11/17/log4j-levels-all-trace-debug-info-warn-error-fatal-off/
Loggers may be assigned levels. The set of possible levels, that is DEBUG, INFO, WARN, ERROR and FATAL are defined in the org.apache.log4j.Level class.
The root logger resides at the top of the logger hierarchy. It always exists and always has an assigned level.
The logger is the core component of the logging process. In log4j, there are 5 normal levels Levels of logger available (not including custom Levels), the following is borrowed from the log4j API (http://jakarta.apache.org/log4j/docs/api/index.html): DEBUG - The DEBUG Level designates fine-grained informational events that are most useful to debug an application. INFO – The INFO level designates informational messages that highlight the progress of the application at coarse-grained level. WARN – The WARN level designates potentially harmful situations. ERROR – The ERROR level designates error events that might still allow the application to continue running.
TRACE - The TRACE Level designates finer-grained informational events than the DEBUG FATAL – The FATAL level designates very severe error events that will presumably lead the application to abort. ALL -The ALL Level has the lowest possible rank and is intended to turn on all logging. OFF – The OFF Level has the highest possible rank and is intended to turn off logging.
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