使用Log4j2 2.8.1在运行时动态添加文件日志记录 [英] Add file logging dynamically at runtime with Log4j2 2.8.1
问题描述
我需要以编程方式添加文件记录，并动态生成文件名。
I am in need of adding programmatically a file logging, with file name generated dynamically.
我的代码是这样的：
private static final Logger LOGGER = LogManager.getLogger(Archiver.class);
public static void openLogfile(String folder) {
String dateTime = "TODO";
String fileName = folder + "upload" + dateTime + ".log";
LOGGER.info("Opening " + fileName + " for logging.");
// setting up a FileAppender dynamically...
final LoggerContext ctx = (LoggerContext) LogManager.getContext(false);
final Configuration config = ctx.getConfiguration();
Layout layout = PatternLayout.createLayout(PatternLayout.SIMPLE_CONVERSION_PATTERN, null, config, null,
null, true, true, null, null);
Appender appender = FileAppender.createAppender(fileName, "false", "false", "File", "true",
"false", "false", "4000", layout, null, "false", null, config);
appender.start();
config.addAppender(appender);
AppenderRef ref = AppenderRef.createAppenderRef("File", null, null);
AppenderRef[] refs = new AppenderRef[]{ref};
LoggerConfig loggerConfig = LoggerConfig.createLogger(true, Level.DEBUG, "org.apache.logging.log4j", "", refs,
null, config, null);
loggerConfig.addAppender(appender, null, null);
config.addLogger("org.apache.logging.log4j", loggerConfig);
ctx.updateLoggers();
}
我看了一下配方如何以编程方式在运行时添加Log4J2 appender？和 http://logging.apache.org/log4j/2.x/manual/customconfig。 html＃AddingToCurrent 。
我的问题是：
- 上面说的log4j2 doc上的例子不会编译，它已经过时了，不得不添加几个参数而不知道它们是什么，通常我添加了空值。
- 现在不推荐使用文档中使用的方法;
- 正在创建文件但是虽然在控制台上输出了，但是没有日志出现，程序退出后，文件中也没有任何内容被刷新。
请有人请提供一个带有最新API的下降示例log4j2动态添加文件记录？我使用org.apache.logging.log4j 2.8.1。
Could somebody please provide a descent example with a most recent API to log4j2 to dynamically add file logging? I use org.apache.logging.log4j 2.8.1.
推荐答案
根据评论中的其他信息，这是我的建议。我不认为你需要以你在问题中提到的所有原因进行编程。
Based on additional information in the comments, here is my suggestion. I don't think you need to do this programmatically for all the reasons you mentioned in your question.
相反，你可以使用类似下面的例子来配置log4j2系统。请注意，您不一定需要我只是用于测试的控制台appender。
Instead you can configure the log4j2 system using something like the following example. Note that you do not necessarily need the console appender I simply used that for testing.
log4j2.xml内容：
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
<Appenders>
<Console name="STDOUT" target="SYSTEM_OUT">
<PatternLayout pattern="[%date{ISO8601}][%-5level][%t] %m%n" />
</Console>
<File
fileName="logs/${ctx:fileName}.txt"
name="logFile">
<PatternLayout>
<Pattern>[%date{ISO8601}][%-5level][%t] %m%n</Pattern>
</PatternLayout>
</File>
</Appenders>
<Loggers>
<Logger name="example" level="TRACE" additivity="false">
<AppenderRef ref="STDOUT" />
<AppenderRef ref="logFile" />
</Logger>
<Root level="WARN">
<AppenderRef ref="STDOUT" />
</Root>
</Loggers>
</Configuration>
Java代码：
package example;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.logging.log4j.ThreadContext;
public class LogFileNameBasedOnArg0Main {
public static void main(String[] args) {
ThreadContext.put("fileName", args[0]);
Logger log = LogManager.getLogger();
log.info("Here's some info!");
}
}
输出：
我使用myFile的程序参数生成了文件：logs / myFile.txt，其中包含以下内容：
I used a program argument of "myFile" which generated the file: logs/myFile.txt with the following content:
[2017-05-03T11:20:37,653][INFO ][main] Here's some info!
您应该可以修改此示例以满足您的需求，您无需执行任何操作程序化配置，从而避免了你提到的问题。
You should be able to modify this example to meet your needs and you won't have to do any programmatic configuration thus avoiding the issues you mentioned.
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