Java log4j配置文件不工作

Question

我有一个log4j配置文件，如下所示，我想做的是在控制台中输出跟踪，并将错误消息输出到该文件（fileerror）。但它不起作用，控制台和文件都处于跟踪级别。

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE log4j:configuration SYSTEM "log4j.dtd">
<log4j:configuration debug="true"
  xmlns:log4j='http://jakarta.apache.org/log4j/'>
    <appender name="console" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" 
            value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
        </layout>
    </appender>
    <appender name="fileerror" class="org.apache.log4j.RollingFileAppender">
        <param name="append" value="false" />
        <param name="maxFileSize" value="1024MB" />
        <param name="maxBackupIndex" value="2" />
        <param name="file" value="ExonImpact.error.log.txt" />
        <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern" 
            value="%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n" />
        </layout>
    </appender>
    <logger name="ccbb.hrbeu" additivity="true">
            <level value="TRACE"/>
            <appender-ref ref="console" />
    </logger>
    <root>
            <level value="ERROR"/>
            <appender-ref ref="fileerror" />
    </root>
</log4j:configuration>

下面是我的log4j调试信息。

log4j: reset attribute= "false".
log4j: Threshold ="null".
log4j: Retreiving an instance of org.apache.log4j.Logger.
log4j: Setting [ccbb.hrbeu] additivity to [true].
log4j: Level value for ccbb.hrbeu is  [TRACE].
log4j: ccbb.hrbeu level set to TRACE
log4j: Class name: [org.apache.log4j.ConsoleAppender]
log4j: Parsing layout of class: "org.apache.log4j.PatternLayout"
log4j: Setting property [conversionPattern] to [%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n].
log4j: Adding appender named [console] to category [ccbb.hrbeu].
log4j: Level value for root is  [ERROR].
log4j: root level set to ERROR
log4j: Class name: [org.apache.log4j.RollingFileAppender]
log4j: Setting property [append] to [false].
log4j: Setting property [maxFileSize] to [1024MB].
log4j: Setting property [maxBackupIndex] to [2].
log4j: Setting property [file] to [ExonImpact.error.log.txt].
log4j: Parsing layout of class: "org.apache.log4j.PatternLayout"
log4j: Setting property [conversionPattern] to [%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n].
log4j: setFile called: ExonImpact.error.log.txt, false
log4j: setFile ended
log4j: Adding appender named [fileerror] to category [root].

Answer 1

默认情况下，子记录器捕获的所有消息都会传播到根记录器。这就是为什么你的两个记录者记录相同的信息。您可以将additivity参数设置为false（additivity=“false”），以防止记录器将消息传递给根记录器。或者，您可以向文件追加器添加一个额外的“阈值”参数：

<param name="Threshold" value="ERROR" />

然后它将忽略所有低于错误级别的消息