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("------");