水平的特定记录器

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问题描述

我正在使用 log4j 进行日志记录.我有一个场景，我必须针对不同的严重性使用单独的日志记录.例如，对于包 foo，我必须在控制台中打印严重性为 ERROR 的消息，而我必须在日志文件中打印严重性为 WARN 的消息.我该如何配置我的 log4j.xml.

推荐答案

您可以为您的任务使用 LevelMatchFilter.此外，您不应忘记使用另一个过滤器 - DenyAllFilter - 作为过滤器链中的最后一个过滤器.

您的 log4j.xml 将如下所示:

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.SimpleLayout" />
        <filter class="org.apache.log4j.varia.LevelMatchFilter">
            <param name="LevelToMatch" value="ERROR" />
            <param name="AcceptOnMatch" value="true" />
        </filter>
        <filter class="org.apache.log4j.varia.DenyAllFilter" />     
    </appender>

    <appender name="fileAppender" class="org.apache.log4j.FileAppender">
        <param name="File" value="error.log" /> 
        <layout class="org.apache.log4j.SimpleLayout" />
        <filter class="org.apache.log4j.varia.LevelMatchFilter">
            <param name="LevelToMatch" value="WARN" />
            <param name="AcceptOnMatch" value="true" />
        </filter>
        <filter class="org.apache.log4j.varia.DenyAllFilter" />     
    </appender>

    <logger name="foo">
         <level value="WARN" />
         <appender-ref ref="consoleAppender" />
         <appender-ref ref="fileAppender" />
    </logger>
</log4j:configuration>

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问题描述

I am using log4j for logging. I have a scenario where I have to use seperate logging for different severity. For example, for package foo I have to print messages with severity ERROR in the console whereas I have to print messages with severity WARN in log file. How can I configure my log4j.xml for the same.

推荐答案

You may use LevelMatchFilter for your task. Also you should not forget to use another filter - DenyAllFilter - as the last filter in the chain of filters.

Your log4j.xml will look like this:

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
        <layout class="org.apache.log4j.SimpleLayout" />
        <filter class="org.apache.log4j.varia.LevelMatchFilter">
            <param name="LevelToMatch" value="ERROR" />
            <param name="AcceptOnMatch" value="true" />
        </filter>
        <filter class="org.apache.log4j.varia.DenyAllFilter" />     
    </appender>

    <appender name="fileAppender" class="org.apache.log4j.FileAppender">
        <param name="File" value="error.log" /> 
        <layout class="org.apache.log4j.SimpleLayout" />
        <filter class="org.apache.log4j.varia.LevelMatchFilter">
            <param name="LevelToMatch" value="WARN" />
            <param name="AcceptOnMatch" value="true" />
        </filter>
        <filter class="org.apache.log4j.varia.DenyAllFilter" />     
    </appender>

    <logger name="foo">
         <level value="WARN" />
         <appender-ref ref="consoleAppender" />
         <appender-ref ref="fileAppender" />
    </logger>
</log4j:configuration>

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