Java.util.logger继续写入新的日志文件

Question

I'm having this issue where my logger keeps writing to a new file

    Logger logger = Logger.getLogger("NewLogger");
    FileHandler fh;
    //create log file string 
    Date date = new Date(); 
    String yyyyMMdd = new SimpleDateFormat("yyyy-MM-dd").format(date);
    String logFileName = "retrieveproductstracking_" + yyyyMMdd; 
    fh = new FileHandler("./" + logFileName + ".log");
    logger.addHandler(fh);
    SimpleFormatter formatter = new SimpleFormatter();
    fh.setFormatter(formatter);

    logger.setUseParentHandlers(false);
    logger.info(request.getRemoteAddr() + ", " + url + ", " + "timestamp" ); 

This code is being used in a JSP where it's called and the logger logs the URL, IP. The problem is that the logger writes to a new file every time, but not only that...it writes to all of the previous files before it too.

Not exactly what I had in mind for rotating logs.

See image: http://puu.sh/cnu39/8b814e9f3f.png http://puu.sh/cnvKw/8c0e5dce11.png

Answer 1

You need to close the file handler with fh.close() once you've finished. Otherwise, you leave the files locked. That's why your image is showing so many lock files open!

Answer 2

指定第二个参数追加到现有文件。（以追加模式打开文件）

 fh = new FileHandler("logFileName.log",true); // true specify append mode