log4j2：包含PID [英] log4j2: Include PID

问题描述

我正在使用log4j2，同时在不同的进程（即不同的JVM）中运行相同代码的多个实例。我希望所有进程都能记录到同一个文件，interleaved如何配置（通过log4j2.xml）输出PID，以便在日志中区分不同的进程？

I'm using log4j2, and running multiple instances of the same code in different processes (ie different JVMs) at the same time. I'd like all processes to log to the same file, interleaved How can I configure (via log4j2.xml) to output the PID, so that the different processes can be distinguished in the logs?

推荐答案

或许 MDC 可以帮到你。试试这个：

Perhaps MDC can help you. Try this:

Java ：

import java.lang.management.ManagementFactory;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.ThreadContext;

public class TestPID {

    private static final Logger LOG = LogManager.getLogger(TestPID.class);

    static {
        // Get the process id
        String pid = ManagementFactory.getRuntimeMXBean().getName().replaceAll("@.*", "");

        // MDC
        ThreadContext.put("pid", pid);
    }

    public static void main(String[] args) {
        LOG.info("Testing...");
    }

}

XML ：

<?xml version="1.0" encoding="UTF-8"?>
<Configuration>
  <Appenders>
    <Console name="Console" target="SYSTEM_OUT">
      <PatternLayout pattern="%d %5X{pid} %-5p %c#%M - %m%n" />
    </Console>
  </Appenders>
  <Loggers>
    <Root level="info">
      <AppenderRef ref="Console" />
    </Root>
  </Loggers>
</Configuration>

输出：

2014-09-10 00:13:49,281  7164 INFO  TestPID#main - Testing...
                         ↑↑↑↑
                    That's the PID

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您可能希望看到：

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You may want to see:

• 布局 - PatternLayout


• Java / JEE中的有效日志记录 - 映射的诊断上下文


• Java程序如何获得自己的进程ID？


• 如何使用MDC与线程池？

• Layouts - PatternLayout
• Effective Logging in Java/JEE – Mapped Diagnostic Context
• How can a Java program get its own process ID?
• How to use MDC with thread pools?

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