Java log4j 支持 JSON 格式吗？
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Does log4j support JSON format?
提问by Stefan
Is it possible to let log4j output its logging in JSON format by only altering the log4j.properties.xmlconfiguration file?
I make use of an old application that uses log4j 1.2. I only see the XML layout but no JSON layout.
是否可以仅通过更改log4j.properties.xml配置文件让 log4j 以 JSON 格式输出其日志记录？
我使用了一个使用log4j 1.2. 我只看到 XML 布局，但没有看到 JSON 布局。
采纳答案by chad chen
just use buildin PatternLayout is ok:
只需使用 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
will out put like:
会像这样：
{
"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"
}
回答by Anna Malai
Yes It is possible. Take a look at this linkIt can generate
对的，这是可能的。 看看这个链接可以生成
{
"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"
}
回答by Karpov S.Y.
this is official JSON layout
这是官方的 JSON 布局
https://github.com/logstash/log4j-jsonevent-layout
https://github.com/logstash/log4j-jsonevent-layout
1) Add maven dependency https://mvnrepository.com/artifact/net.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) Add configuration to your log4j.propertiesfile
2）将配置添加到您的log4j.properties文件中
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
