java - log4j 消息转 json

Question

我有一条消息，比如 delay=1, name=Ash，我想使用 log4j2 进行记录。我希望我的日志文件的每一行都是 json 格式

{"@timestamp": 1234, "delay"=1, "name"="Ash"}

@timestamp 字段是记录器生成的时间戳，而 delay 和 name 字段是消息字段。

有办法做到这一点吗？通过使用 JsonLayout，我知道我可以以 json 格式获取每个记录的输出，但我仍然没有找到一种方法来操作日志消息，以便我可以将其不同部分放在不同的字段中。

Answer 1

您可以使用 log4j2 JSONLayout 来完成此操作。

• 首先你必须指定 jsonlayout

示例:

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <JSONLayout compact="true" eventEol="true" properties="true"/>
        </Console>
    </Appenders>
    <Loggers>
        <Root level="info">
            <AppenderRef ref="Console"/>
        </Root>
    </Loggers>
</Configuration>

这里如果设置compact = false，json将以prity格式打印

• 其次，您可以ThreadContext将值作为键值对。

示例:

for (int i = 0; i < 5; i++) {
    ThreadContext.clearAll();
    ThreadContext.put("delay", String.valueOf(i));
    ThreadContext.put("name", "Ash " + i);
    LOGGER.info("Testing ", "k1", "v1", "k2", "v2");
}

这里ThreadContext保留所有键值对，直到清除。

输出:

{"timeMillis":1491819918389,"thread":"main","level":"INFO","loggerName":"com.ashraful.ilpexp.LogTest","message":"Testing ","endOfBatch":false,"loggerFqcn":"org.apache.logging.log4j.spi.AbstractLogger","contextMap":{"delay":"0","name":"Ash 0"},"threadId":1,"threadPriority":5}
{"timeMillis":1491819918504,"thread":"main","level":"INFO","loggerName":"com.ashraful.ilpexp.LogTest","message":"Testing ","endOfBatch":false,"loggerFqcn":"org.apache.logging.log4j.spi.AbstractLogger","contextMap":{"delay":"1","name":"Ash 1"},"threadId":1,"threadPriority":5}
{"timeMillis":1491819918504,"thread":"main","level":"INFO","loggerName":"com.ashraful.ilpexp.LogTest","message":"Testing ","endOfBatch":false,"loggerFqcn":"org.apache.logging.log4j.spi.AbstractLogger","contextMap":{"delay":"2","name":"Ash 2"},"threadId":1,"threadPriority":5}
{"timeMillis":1491819918505,"thread":"main","level":"INFO","loggerName":"com.ashraful.ilpexp.LogTest","message":"Testing ","endOfBatch":false,"loggerFqcn":"org.apache.logging.log4j.spi.AbstractLogger","contextMap":{"delay":"3","name":"Ash 3"},"threadId":1,"threadPriority":5}
{"timeMillis":1491819918505,"thread":"main","level":"INFO","loggerName":"com.ashraful.ilpexp.LogTest","message":"Testing ","endOfBatch":false,"loggerFqcn":"org.apache.logging.log4j.spi.AbstractLogger","contextMap":{"delay":"4","name":"Ash 4"},"threadId":1,"threadPriority":5}