Logback-以编程方式设置日志文件名

Question

我正在使用logback，并且尝试在Java程序中以编程方式设置日志文件名（类似于以编程方式设置LogbackAppender路径），并且我尝试按以下方法调整该解决方案：

在logback-test.xml中：

<appender name="FILE" class="ch.qos.logback.core.FileAppender">
  <file>log/${log_file_name}.log</file>
  ...

然后再次在我的Java程序中：

String logFileName = "" + System.currentTimeMillis(); // just for example
System.setProperty("log_file_name", logFileName);

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);

但是结果是两个日志，一个完整并按我的意愿命名，例如“ 1319041145343.log”，另一个为空并命名为“
log_file_name_IS_UNDEFINED.log”。如何停止其他空日志文件的创建？

Answer 1

我相信以下内容将更接近您想要的内容。

import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.core.FileAppender;
import ch.qos.logback.core.util.StatusPrinter;
import org.slf4j.LoggerFactory;
import ch.qos.logback.classic.LoggerContext;

public class Main {
  public static void main(String[] args) {
    LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();

    FileAppender fileAppender = new FileAppender();
    fileAppender.setContext(loggerContext);
    fileAppender.setName("timestamp");
    // set the file name
    fileAppender.setFile("log/" + System.currentTimeMillis()+".log");

    PatternLayoutEncoder encoder = new PatternLayoutEncoder();
    encoder.setContext(loggerContext);
    encoder.setPattern("%r %thread %level - %msg%n");
    encoder.start();

    fileAppender.setEncoder(encoder);
    fileAppender.start();

    // attach the rolling file appender to the logger of your choice
    Logger logbackLogger = loggerContext.getLogger("Main");
    logbackLogger.addAppender(fileAppender);

    // OPTIONAL: print logback internal status messages
    StatusPrinter.print(loggerContext);

    // log something
    logbackLogger.debug("hello");
  }
}

如果只需要html" target="_blank">添加日志文件名的时间戳，则logback已经支持timestamp元素。因此，您实际上根本不需要任何自定义代码。