Question

我有以下方法来检索由logback在日志目录中生成的日志文件的名称。前9行确定日志目录：

    private List<String> getLogFileNames() {
        List<String> logFileNames = new ArrayList<>();

        ch.qos.logback.classic.Logger rootLogger = ((ch.qos.logback.classic.Logger) LOGGER).getLoggerContext().getLogger("root");

        Path logDir;

        Appender<ILoggingEvent> appender = rootLogger.getAppender("file");
        if (appender == null) {
            logDir = Paths.get(System.getProperty("user.dir"), "../logs");
        } else {
           RollingFileAppender<?> rollingFileAppender = (RollingFileAppender<?>) appender;
           logDir = Paths.get(rollingFileAppender.getFile()).getParent();
       }

        try {
            Files.list(logDir).forEach(log -> logFileNames.add(log.toFile().getName()));
        } catch (IOException e) {
            throw new IllegalStateException(e);
        }

        return logFileNames;
}

有时会引发以下异常： java.nio.file.FileSystemException：...：打开的文件太多

我怀疑在Files.list（logDir）.forEach（）语句中引发了异常。这段代码文件以某种方式被打开但从未关闭。我该如何解决？我可以使用foreach语句还是应该使用类似的内容：

try(Stream<Path> stream = Files.walk(logDir)) {
    // Code to extract the filename
}
catch(UncheckedIOException ex) {
    throw ex.getCause();
}

Answer 1

重复：Why does usage of java.nio.files.File::list is causing this breadth-first file traversal program to crash with the "Too many open files" error?

考虑使用Try With Resources Approach.

检索目录中的文件名时遇到问题

1 个答案: