6

我在我的应用程序中使用 log4j 来记录具有不同日志级别的某些包。

但是，此日志文件中似乎没有捕获 stderr 和 stdout，而是在应用程序启动时将它们打印在文件中

java AppName >> out.log

是否可以在 log4j 中捕获 stdout 和 stderr （例如 stdout 作为 info 和 stderr 作为 WARN/ERROR ）以及在 out.log 文件中？

log4j 的设置如下：

<log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/">
    <appender name="FileAppender" class="org.apache.log4j.DailyRollingFileAppender">
        <param name="File" value="${MDCapture.logfile.dir}/${APP_NAME}.log"/>
        <param name="BufferedIO" value="false"/>
        <param name="DatePattern" value="'.'yyyy-MMM-dd"/>
        <layout class="org.apache.log4j.TTCCLayout">
            <param name="DateFormat" value="ISO8601"/>
        </layout>
    </appender>

    <appender name="AsyncAppenders" class="org.apache.log4j.AsyncAppender">
        <appender-ref ref="FileAppender"/>
    </appender>

<!-- LOGGER PACKAGES -->

<root>
    <priority value="info"/>
    <appender-ref ref="AsyncAppenders"/>
</root>
</log4j:configuration>

更新：

堆栈溢出错误的堆栈跟踪：

WARN root buffer size limit:65log4j:WARN root buffer size limit:65Exception in thread "Thread-12"
2013-03-22 09:14:24,451 [Thread-12] ERROR root - java.lang.StackOverflowError
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at java.io.BufferedWriter.write(BufferedWriter.java:202)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at java.io.Writer.write(Writer.java:140)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at java.io.PrintStream.write(PrintStream.java:475)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at java.io.PrintStream.print(PrintStream.java:619)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at java.io.PrintStream.println(PrintStream.java:756)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.helpers.LogLog.warn(LogLog.java:171)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.AsyncAppender.append(AsyncAppender.java:175)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:66)


2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.Category.callAppenders(Category.java:206)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.Category.forcedLog(Category.java:391)
2013-03-22 09:14:24,452 [Thread-12] ERROR root -        at org.apache.log4j.Category.log(Category.java:838)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at com.company.something.AClass.LoggingOutputStream.flush(LoggingOutputStream.java:198)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at java.io.PrintStream.write(PrintStream.java:432)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:202)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:272)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at sun.nio.cs.StreamEncoder.flushBuffer(StreamEncoder.java:85)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at java.io.OutputStreamWriter.flushBuffer(OutputStreamWriter.java:168)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at java.io.PrintStream.write(PrintStream.java:477)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at java.io.PrintStream.print(PrintStream.java:619)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at java.io.PrintStream.println(PrintStream.java:756)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at org.apache.log4j.helpers.LogLog.warn(LogLog.java:171)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at org.apache.log4j.AsyncAppender.append(AsyncAppender.java:175)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at org.apache.log4j.AppenderSkeleton.doAppend(AppenderSkeleton.java:251)
2013-03-22 09:14:24,453 [Thread-12] ERROR root -        at org.apache.log4j.helpers.AppenderAttachableImpl.appendLoopOnAppenders(AppenderAttachableImpl.java:
4

2 回答 2

5

对于 log4j 2.x：

System.setErr(IoBuilder.forLogger(LogManager.getRootLogger()).setLevel(Level.ERROR).buildPrintStream());
System.setOut(IoBuilder.forLogger(LogManager.getRootLogger()).setLevel(Level.INFO).buildPrintStream());

依赖信息：

  • 组：org.apache.logging.log4j
  • 工件：log4j-iostreams
于 2016-08-24T21:09:38.343 回答
4

要将 stdout 和 stderr 重定向到 log4j，请尝试以下操作：

System.setErr( new PrintStream( new LoggingOutputStream( Logger.getRootLogger(  ), Level.ERROR ), true);

System.setOut( new PrintStream( new LoggingOutputStream( Logger.getRootLogger(  ), Level.INFO ), true);

因为LoggingOutputStream你可以从这个例子开始

要让 log4j 将您想要的内容打印到控制台（如果需要，可以将其捕获回文件/节点），将ConsoleAppender启用到适当的级别

于 2013-03-20T17:27:11.970 回答