获取任何给定路径的FileStore对象

时间:2014-01-28 22:34:27

标签: java linux macos os-agnostic

编辑:我认识到FileSystem.getDefault()会在我原来的问题陈述中给出我想要的内容。我正在尝试使用FileSystem.getFileSystem(URI)来获取任何给定路径的FileSystem。

我正在尝试开发一些代码,它将为我提供给定路径的java.nio.file.FileSystem对象。

这是一些非常简化的示例代码,可以更好地了解正在尝试的内容:

public FileSystem getCwdFilesystem()
{
    URI cwdUri = null;
    String delimiter = "";
    try
    {
        _cwd = System.getProperty("user.dir");
        cwdUri = new URI("file", delimiter + _cwd, null);
    }
    catch (URISyntaxException ue)
    {
        System.out.println("URI Creation failure on URI: " + _cwd);
        ue.printStackTrace();
        System.exit(1);
    }

    System.out.println("Filestore data for CWD: " + cwdUri.toString());

    return (FileSystems.getFileSystem(cwdUri));
}

执行时,会在最后一行代码中抛出异常:

Filestore data for CWD: file:/Users/redacted/Documents/Java%20Projects/ExampleCode
Exception in thread "main" java.lang.IllegalArgumentException: Path component should be '/'
    at sun.nio.fs.UnixFileSystemProvider.checkUri(UnixFileSystemProvider.java:77)
    at sun.nio.fs.UnixFileSystemProvider.getFileSystem(UnixFileSystemProvider.java:92)
    at java.nio.file.FileSystems.getFileSystem(FileSystems.java:217)
    at examplecode.FilesystemCapacity.getCwdFilesystem(FilesystemCapacity.java:54)
    at examplecode.FilesystemCapacity.main(FilesystemCapacity.java:33)
Java Result: 1

当我对分隔符变量进行小的更新时:

String delimiter = "/";

我从同一个地方抛出了不同的错误消息:

Filestore data for CWD: file://Users/redacted/Documents/Java%20Projects/ExampleCode
Exception in thread "main" java.lang.IllegalArgumentException: Authority component present
    at sun.nio.fs.UnixFileSystemProvider.checkUri(UnixFileSystemProvider.java:73)
    at sun.nio.fs.UnixFileSystemProvider.getFileSystem(UnixFileSystemProvider.java:92)
    at java.nio.file.FileSystems.getFileSystem(FileSystems.java:217)
    at examplecode.FilesystemCapacity.getCwdFilesystem(FilesystemCapacity.java:54)
    at examplecode.FilesystemCapacity.main(FilesystemCapacity.java:33)
Java Result: 1

在分隔符中添加其他“/”字符只会让我再次收到第一条错误消息。

我做错了什么?

1 个答案:

答案 0 :(得分:2)

我找到了一个我之前错过了NIO.2文档记录on the last page的引用。

我写了一些测试代码,这些代码完全符合我的要求:

    public void getPathFilesystem(String path)
    {
        try
        {
            URI rootURI = new URI("file:///");
            Path rootPath = Paths.get(rootURI);
            Path dirPath = rootPath.resolve(path);
            FileStore dirFileStore = Files.getFileStore(dirPath);

            printFileStore(dirFileStore, path);
        }
        catch (IOException | URISyntaxException e)
        {
            e.printStackTrace();
        }
    }

    public void printFileStore(FileStore filestore, String path)
    {
        try
        {
            System.out.println("Name: " + filestore.name());
            System.out.println("\tPath: " + path);
            System.out.println("\tSize: " + filestore.getTotalSpace());
            System.out.println("\tUnallocated: " + filestore.getUnallocatedSpace());
            System.out.println("\tUsable: " + filestore.getUsableSpace());
            System.out.println("\tType: " + filestore.type());
        }
        catch (IOException ioe)
        {
            ioe.printStackTrace();
        }
    }