我正在尝试使用Log4J(2.6.2)将我的日志存储在JSON文件中。我在JsonLayout
中使用RollingFileAppender
,只要我没有尝试附加到之前已经写过的文件,它就能正常工作。
这是我设置布局和Appender的代码:
Layout<?> layout = JsonLayout.createLayout(config, false, false, false, true, false, true, "[", "]", Charset.defaultCharset());
String appenderFileName = "mylogfile-latest.log.json";
String appenderFilePattern = "mylogfile-%i.log.json";
String appenderName = "MyAppender";
Appender appender = RollingFileAppender.createAppender(appenderFileName, appenderFilePattern, "true", appenderName, "true", "256", "true",
SizeBasedTriggeringPolicy.createPolicy(this.configuration.getLogMaxSize().toString()),
null, layout, null, "false", "false", null, config);
正如我所说,我第一次在日志文件中写的时候工作正常:
[
{
"timeMillis" : 1469620840442,
"thread" : "SimpleAsyncTaskExecutor-43",
"level" : "ERROR",
"loggerName" : "MyLogger",
"message" : "my log message",
"endOfBatch" : false,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"threadId" : 243,
"threadPriority" : 5
}
, {
"timeMillis" : 1469620840442,
"thread" : "SimpleAsyncTaskExecutor-43",
"level" : "DEBUG",
"loggerName" : "MyLogger",
"message" : "my log message",
"endOfBatch" : false,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"threadId" : 243,
"threadPriority" : 5
}
]
然后关闭我的appender等...并重新启动我的应用程序,当我将新日志写入此现有文件时,这就是我所得到的:
[
{
"timeMillis" : 1469620840442,
"thread" : "SimpleAsyncTaskExecutor-43",
"level" : "ERROR",
"loggerName" : "MyLogger",
"message" : "my log message",
"endOfBatch" : false,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"threadId" : 243,
"threadPriority" : 5
}
, {
"timeMillis" : 1469620840442,
"thread" : "SimpleAsyncTaskExecutor-43",
"level" : "DEBUG",
"loggerName" : "MyLogger",
"message" : "my log message",
"endOfBatch" : false,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"threadId" : 243,
"threadPriority" : 5
}
]
{
"timeMillis" : 1469620840490,
"thread" : "SimpleAsyncTaskExecutor-43",
"level" : "ERROR",
"loggerName" : "MyLogger",
"message" : "my log message",
"endOfBatch" : false,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"threadId" : 245,
"threadPriority" : 5
}
, {
"timeMillis" : 1469620840492,
"thread" : "SimpleAsyncTaskExecutor-43",
"level" : "DEBUG",
"loggerName" : "MyLogger",
"message" : "my log message",
"endOfBatch" : false,
"loggerFqcn" : "org.apache.logging.log4j.spi.AbstractLogger",
"threadId" : 245,
"threadPriority" : 5
}
]
此问题导致无法解析日志,因为Gson无法从此文件创建List
。
你是否知道如何解决这个问题而不做一个糟糕的黑客删除额外的]
并用逗号替换它?
谢谢!
答案 0 :(得分:1)
JSONLayout这样做的原因是创建一个“格式良好”的JSON文档。您需要将每个文档放在它自己的文件中(带有开始和结束括号),这样才是真的,这不是这里的情况。
您有两种选择:
答案 1 :(得分:0)
由于没有其他解决方案令人满意,我最终使用正则表达式来替换无效字符......
它非常安全,因为它检查它是否在两个双引号之间,但它显然不是理想的解决方案:
String content = new String(Files.readAllBytes(Paths.get(pathToLogFile)));
content = content.replaceAll("(\\}\\R{2}\\]\\R\\{)(?=(?:(?:\\.|[^\"\\\\])*\"(?:\\.|[^\"\\\\])*\")*(?:\\.|[^\"\\\\])*)", "}\n, {");
Files.write(Paths.get(pathToLogFile), content.getBytes());