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我正在尝试以编程方式设置Logback appender路径.(具有FixedWindowRollingPolicy的RollingFileAppender准确)

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)

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:

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);