Java nio2 目录没有关闭。导致 "too many open files"错误

Question

<分区>

Answer 1

我发现了错误。我用过这个:

List<Path> result = Files.list(tmp).collect(Collectors.toList());

这会使目录打开两次!

正确的做法其实是这样的:

List<Path> result;
try(Stream<Path> stream = Files.list(tmp)){
    result = stream.collect(Collectors.toList());
}

java文档:

The returned stream encapsulates a DirectoryStream. If timely disposal of file system resources is required, the try-with-resources construct should be used to ensure that the stream's close method is invoked after the stream operations are completed.