以编程方式设置Logback Appender路径 [英] Setting Logback Appender path programmatically

问题描述

我正在尝试以编程方式设置Logback appender路径。 （确切地说，使用FixedWindowRollingPolicy RollingFileAppender ）

I'm trying to set Logback appender path programmatically. (RollingFileAppender with FixedWindowRollingPolicy to be exact)

我这样做是因为我想让我的用户在首选项对话框中设置日志路径（Eclipse RCP）

I'm doing this because I want to enable my users to set the log path in a preference dialog (Eclipse RCP)

我尝试过类似的东西，但是我没有改变配置文件中定义的日志路径：

I've tried something like this, but I doesn't change the log path from what's defined in the configuration file:

Logger logback_logger = (ch.qos.logback.classic.Logger)LoggerFactory
   .getLogger(org.slf4j.Logger.ROOT_LOGGER_NAME);
RollingFileAppender<ILoggingEvent> rfappender = 
   (RollingFileAppender<ILoggingEvent>)logback_logger.getAppender("FILE");
rfappender.setFile(newFile);
FixedWindowRollingPolicy rollingPolicy = 
   (FixedWindowRollingPolicy)rfappender.getRollingPolicy();
rollingPolicy.setFileNamePattern(newPattern);

推荐答案

使用系统属性并重新加载配置文件似乎更干净：

Using system properties and reloading the configuration file seems cleaner:

更改logback.xml文件：

change the logback.xml file:

<file>${log_path:-}myfile.log</file>
....
<FileNamePattern>${log_path:-}myfile.%i.log</FileNamePattern>

这将设置工作目录的默认位置。
然后，使用：

This will set the default location to the working directory. Then, use:

System.setProperty("log_path", my_log_path);

//Reload:
LoggerContext lc = (LoggerContext) LoggerFactory.getILoggerFactory();
ContextInitializer ci = new ContextInitializer(lc);
lc.reset();
try {
  //I prefer autoConfig() over JoranConfigurator.doConfigure() so I wouldn't need to find the file myself.
  ci.autoConfig(); 
} catch (JoranException e) {
  // StatusPrinter will try to log this
  e.printStackTrace();
}
StatusPrinter.printInCaseOfErrorsOrWarnings(lc);

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