Log4j日志的使用

首先导入相关的包文件

<?xml version="1.0" encoding="UTF-8"?>  
<!DOCTYPE log4j:configuration PUBLIC "-//log4j/log4j Configuration//EN" "log4j.dtd">  
<log4j:configuration>  
    <!--输出到控制台-->  
    <appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">  
        <param name="Threshold" value="DEBUG"/>  
        <layout class="org.apache.log4j.PatternLayout">  
            <param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>  
        </layout>  
    </appender>  
  
    <!--输出到文件（info）-->  
    <!--将生成“admin.log.2014-06-11”这样的日志文件-->  
    <appender name="fileAppenderInfo" class="org.apache.log4j.DailyRollingFileAppender">  
        <param name="File" value="/logs/admin.log" />  
        <param name="DatePattern" value=".yyyy-MM-dd" />  
        <layout class="org.apache.log4j.PatternLayout">  
            <param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>  
        </layout>  
        <filter class="org.apache.log4j.varia.LevelRangeFilter">  
            <param name="LevelMin" value="INFO" />  
            <param name="LevelMax" value="INFO" />  
        </filter>  
    </appender>  
      
  
    <!--输出到文件（warn）-->  
    <appender name="fileAppenderWarn" class="org.apache.log4j.DailyRollingFileAppender">  
        <param name="File" value="/logs/warn.log" />  
        <param name="DatePattern" value=".yyyy-MM-dd" />  
        <layout class="org.apache.log4j.PatternLayout">  
            <param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>  
        </layout>  
  
        <filter class="org.apache.log4j.varia.LevelRangeFilter">  
            <param name="LevelMin" value="WARN" />  
            <param name="LevelMax" value="WARN" />  
        </filter>  
    </appender>  
  
    <!--输出到文件（error）-->  
    <appender name="fileAppenderError" class="org.apache.log4j.DailyRollingFileAppender">  
        <param name="File" value="/logs/error.log" />  
        <param name="DatePattern" value=".yyyy-MM-dd" />  
        <layout class="org.apache.log4j.PatternLayout">  
            <param name="ConversionPattern" value="[%d{HH:mm:ss:SSS}] [%p] - %l - %m%n"/>  
        </layout>  
        <filter class="org.apache.log4j.varia.LevelRangeFilter">  
            <param name="LevelMin" value="ERROR" />  
            <param name="LevelMax" value="ERROR" />  
        </filter>  
    </appender>  
  
    <!--屏蔽所有org.springframework.*输出的Debug（及以下）信息-->  
    <logger name="org.springframework">  
        <level value="INFO"></level>  
    </logger>  
      
    <logger name="admin_trace" additivity="false">  
        <level value="INFO" />  
        <appender-ref ref="fileAppenderInfo" />  
    </logger>  
  
    <root>  
        <level value="ALL"/>  
        <appender-ref ref="consoleAppender" />  
        <appender-ref ref="fileAppenderWarn" />  
        <appender-ref ref="fileAppenderError" />  
    </root>  
</log4j:configuration>  

在相应的java文件中引入

private final Logger TraceLogger = Logger.getLogger("trace");  

TraceLogger.info("------");