使 log4j 控制台附加程序对不同线程使用不同颜色

发布于 2024-12-11 08:00:22 字数 292 浏览 0 评论 0原文

我正在追踪一些并发问题，当登录到控制台时，让每个线程的输出行以不同的颜色显示将非常有帮助。我使用的是 OS X。可以使用转换模式来输出一些控制代码来完成此操作，还是需要自定义附加程序？有人知道怎么做吗？

2011-10-21 12:14:42,859 ["http-bio-8080"-exec-9] DEBUG ...
2011-10-21 12:14:43,198 ["http-bio-8080"-exec-10] DEBUG ...

exec-9 和 exec-10 的行应该采用不同的颜色。

原文

I am tracking down some concurrency issues and it would be very helpful to have the output lines from each thread in a different color when logging to a console. I am on OS X. Could this be done using a conversion pattern to output some control codes or would it need a custom appender? Anyone know how?

2011-10-21 12:14:42,859 ["http-bio-8080"-exec-9] DEBUG ...
2011-10-21 12:14:43,198 ["http-bio-8080"-exec-10] DEBUG ...

The lines for exec-9 and exec-10 should be in different colors.

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望她远 2024-12-18 08:00:22

您可以使用 MulticolorLayout 来自 jcabi-log。将此依赖项添加到项目中：

<dependency>
  <groupId>com.jcabi</groupId>
  <artifactId>jcabi-log</artifactId>
  <version>0.17.1</version>
</dependency>

然后在 log4j.properties 中进行配置：

log4j.rootLogger=INFO, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=com.jcabi.log.MulticolorLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[%color{%p}] %c: %m%n

log4j.xml 中相同：

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out" />
    <layout class="com.jcabi.log.MulticolorLayout">
        <param name="ConversionPattern" value="[%color{%p}] %m%n" />
    </layout>
</appender>

在本例中， %p 将替换为DEBUG、INFO、ERROR等，然后涂成与日志记录级别相关的颜色。除此之外，您还可以使用自己的颜色或预定义的颜色，例如：

log4j.appender.CONSOLE.layout.ConversionPattern=[%p] $color-cyan{%c}: %color-red{%m}%n
log4j.appender.CONSOLE.layout.ConversionPattern=[%p] $color-0;0;31{%c}: %m%n

有关 ANSI 颜色。

You can use MulticolorLayout from jcabi-log. Add this dependency to the project:

<dependency>
  <groupId>com.jcabi</groupId>
  <artifactId>jcabi-log</artifactId>
  <version>0.17.1</version>
</dependency>

And then configure it in log4j.properties:

log4j.rootLogger=INFO, CONSOLE
log4j.appender.CONSOLE=org.apache.log4j.ConsoleAppender
log4j.appender.CONSOLE.layout=com.jcabi.log.MulticolorLayout
log4j.appender.CONSOLE.layout.ConversionPattern=[%color{%p}] %c: %m%n

Same in log4j.xml:

<appender name="CONSOLE" class="org.apache.log4j.ConsoleAppender">
    <param name="Target" value="System.out" />
    <layout class="com.jcabi.log.MulticolorLayout">
        <param name="ConversionPattern" value="[%color{%p}] %m%n" />
    </layout>
</appender>

In this example, %p will be replaced by DEBUG, INFO, ERROR, etc. and then painted into the color that is relevant to the logging level. Besides that you are able to use your own colors or predefined colors, for example:

log4j.appender.CONSOLE.layout.ConversionPattern=[%p] $color-cyan{%c}: %color-red{%m}%n
log4j.appender.CONSOLE.layout.ConversionPattern=[%p] $color-0;0;31{%c}: %m%n

More documentation about ANSI colors.

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烟酉 2024-12-18 08:00:22

您可以扩展 PatternLayout 并覆盖 格式(ILoggingEvent)。在那里你可以查看 LoggingEvent.getThreadName() 根据线程名称获取一些颜色（也许是奇数/偶数？）。

为了将颜色输出到控制台，您需要使用 ANSI 转义序列。

例如，要输出红色文本：

  "\u001b["  // Prefix - see [1]
+ "0"        // Brightness
+ ";"        // Separator
+ "31"       // Red foreground
+ "m"        // Suffix
+ text       // the text to output
+ "\u001b[m " // Prefix + Suffix to reset color

这里有一些示例：

只是补充一下，也许您还可以通过在 MDC 中设置具有随机 ANSI 颜色代码的变量“randColor”来实现此目的，例如在 Filter 中，并在 conversionPattern 中使用它log4j 控制台附加程序配置中标准 org.apache.log4j.PatternLayout 的：

<appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern"
               value="\u001b[0;%X{randColor}m ....... \u001b[m" />
    </layout>
</appender>

[1] “\u001B[J”代表什么？

You can extend PatternLayout and override format(ILoggingEvent). There you could look at LoggingEvent.getThreadName() to get some color based on the thread name (odd/even, maybe?).

In order to output color to the console, you'll need to use an ANSI Escape Sequence.

For instance, to output a red text:

  "\u001b["  // Prefix - see [1]
+ "0"        // Brightness
+ ";"        // Separator
+ "31"       // Red foreground
+ "m"        // Suffix
+ text       // the text to output
+ "\u001b[m " // Prefix + Suffix to reset color

Here some examples:

ColoredPatternLayout implementation by Ingo Thon.
Colour-coded Console Logging with Log4J blog post.

Just to add, maybe you could also achieve this by setting in the MDC a variable "randColor" with a random ANSI color code, for instance, in a Filter, and using it in the conversionPattern of a standard org.apache.log4j.PatternLayout in your log4j's console appender configuration:

<appender name="consoleAppender" class="org.apache.log4j.ConsoleAppender">
    <layout class="org.apache.log4j.PatternLayout">
        <param name="ConversionPattern"
               value="\u001b[0;%X{randColor}m ....... \u001b[m" />
    </layout>
</appender>

[1] What does "\u001B[J" represent?

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