log4j 是否支持 JSON 格式？

Question

是否可以只修改log4j.properties.xml配置文件，让log4j以JSON格式输出日志？
我使用了一个使用 log4j 1.2 的旧应用程序。我只看到 XML 布局但没有看到 JSON 布局。

Answer 1

是的，这是可能的。 Take a look at this link 可以生成

{
   "timestamp":1352412458890,
   "date":"Nov 8, 2012 10:07:38 PM",
   "hostname":"michael1",
   "username":"michael",
   "level":"INFO",
   "thread":"main",
   "classname":"uk.me.mjt.log4jjson.SimpleJsonLayoutTest",
   "filename":"SimpleJsonLayoutTest.java",
   "linenumber":25,
   "methodname":"testDemonstration",
   "message":"Example of some logging"
 }

Answer 2

只需要使用 buildin PatternLayout 就可以了：

log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.encoding=UTF-8
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern={"debug_level":"%p","debug_timestamp":"%d{ISO8601}","debug_thread":"%t","debug_file":"%F", "debug_line":"%L","debug_message":"%m"}%n

输出结果如下：

{
    "debug_level" : "INFO",
    "debug_timestamp" : "2016-05-26 16:37:08,938",
    "debug_thread" : "main",
    "debug_file" : "TestLogOutPut.java",
    "debug_line" : "316",
    "debug_message" : "hello i am a log message"
}

Answer 3

这是官方的JSON布局

https://github.com/logstash/log4j-jsonevent-layout

1) 添加maven依赖https://mvnrepository.com/artifact/net.logstash.log4j/jsonevent-layout

<dependency>
    <groupId>net.logstash.log4j</groupId>
    <artifactId>jsonevent-layout</artifactId>
    <version>1.7</version>  
</dependency>

2) 将配置添加到您的 log4j.properties 文件

 log4j.rootCategory=WARN, RollingLog
 log4j.appender.RollingLog=org.apache.log4j.DailyRollingFileAppender
 log4j.appender.RollingLog.Threshold=TRACE
 log4j.appender.RollingLog.File=api.log
 log4j.appender.RollingLog.DatePattern=.yyyy-MM-dd
 log4j.appender.RollingLog.layout=net.logstash.log4j.JSONEventLayoutV1

Answer 4

我使用了 logback.xml 和下面的模式

<appender name="Console"
          class="ch.qos.logback.core.ConsoleAppender">
    <layout class="ch.qos.logback.classic.PatternLayout">
        <Pattern>
            {"level":"%p","timestamp":"%d{ISO8601}","thread":"%t","file":"%F", "line":"%L","message":"%m"}%n
        </Pattern>
    </layout>
</appender>

并生成 json 格式的日志。我正在使用带有 springboot 依赖项的 log4j。

{"level":"INFO","timestamp":"2020-09-22 15:26:38,354","thread":"main","file":"StartupInfoLogger.java", "line":"55","correlationId":"","message":"Starting Application on XX with PID 88794 (/Users/Documents/target/classes started by xxx in /Users/Documents)"}

log4j 是否支持 JSON 格式？

Does log4j support JSON format?

java

json

log4j