Question

假设我有一个标准的JSON日志，如文档中的示例（下面）

{
    "logger":"com.foo.Bar",
    "timestamp":"1376681196470",
    "level":"INFO",
    "thread":"main",
    "message":"Message flushed with immediate flush=true"
}

现在我想将自定义信息添加到此日志中，如下所示：

{
    "logger":"com.foo.Bar",
    "timestamp":"1376681196470",
    "level":"INFO",
    "thread":"main",
    "message":"Message flushed with immediate flush=true",
    "extrainformation":"Some very important stuff I need to include",
    "extrainformation2":"Some other very important stuff I need to include"
}

有办法做到这一点吗？文档似乎没有提到有关向日志对象添加属性的任何内容。我是否需要制作自定义布局或以编程方式添加字段或什么？

relevant log4j2 docs

Answer 1

喜欢@ alan7678说 -

自定义布局也是我的解决方案。

@Plugin(name = "ExtendedJsonLayout", category = Node.CATEGORY, 
    elementType = Layout.ELEMENT_TYPE, printObject = true)
public class ExtendedJsonLayout extends AbstractJacksonLayout {

// Lots of code!
}

我创建了一个名为“extended-jsonlayout”的Log4j2布局插件。您可以使用Maven或Gradle将其包含在项目中。看看这里 -

https://github.com/savantly-net/log4j2-extended-jsonlayout

Answer 2

这可以通过配置文件存档。

请参阅我的log4j2.yaml：

Configuration:
  status: warn
  appenders:
    Console:
      name: STDOUT
      JsonLayout:
        complete: false
        compact: true
        eventEol: true
        KeyValuePair:
          -
            key: extrainformation
            value: Some very important stuff I need to include
          -
            key: extrainformation2
            value: Some other very important stuff I need to include

  Loggers:
    Root:
      level: "warn"
      AppenderRef:
        ref: STDOUT

自定义字段始终是最后一个，按照声明的顺序排列。值支持lookups

如何向log4j2的JSON日志添加字段

2 个答案: