Java:如何确定文件所在的驱动器类型?

时间:2012-02-06 16:43:32

标签: java drive

是否有一种与平台无关的方式使用Java来检测文件所在的驱动器类型?基本上我有兴趣区分:硬盘可移动驱动器(如USB记忆棒)和网络共享。 JNI / JNA解决方案没有帮助。可以假设Java 7。

4 个答案:

答案 0 :(得分:4)

Swing的FileSystemView类具有部分功能,以支持检测驱动器的类型(参见isFloppyDriveisComputerNode)。我担心没有标准的方法来检测驱动器是否通过USB连接。

未经考验的未经考验的例子:

import javax.swing.JFileChooser;
import javax.swing.filechooser.FileSystemView;
....
JFileChooser fc = new JFileChooser();
FileSystemView fsv = fc.getFileSystemView();
if (fsv.isFloppyDrive(new File("A:"))) // is A: a floppy drive? 

在JDK 7中还有另一种选择。我没有使用它,但FileStore API有一个type方法。 documentation说:

  

此方法返回的字符串格式具有高度特定于实现的格式。例如,它可能表示使用的格式或文件存储是本地还是远程。

显然,使用它的方式是:

import java.nio.*;
....
for (FileStore store: FileSystems.getDefault().getFileStores()) {
    System.out.printf("%s: %s%n", store.name(), store.type());
} 

答案 1 :(得分:4)

您可以使用Java执行cmd:

fsutil fsinfo drivetype {drive letter}

结果会给你这样的东西:

C: - Fixed Drive
D: - CD-ROM Drive
E: - Removable Drive
P: - Remote/Network Drive

答案 2 :(得分:0)

答案 3 :(得分:0)

这是一个Gist,它显示了如何使用net use来确定这一点:https://gist.github.com/digulla/31eed31c7ead29ffc7a30aaf87131def

代码中最重要的部分:

    public boolean isDangerous(File file) {
        if (!IS_WINDOWS) {
            return false;
        }

        // Make sure the file is absolute
        file = file.getAbsoluteFile();
        String path = file.getPath();
//        System.out.println("Checking [" + path + "]");

        // UNC paths are dangerous
        if (path.startsWith("//")
            || path.startsWith("\\\\")) {
            // We might want to check for \\localhost or \\127.0.0.1 which would be OK, too
            return true;
        }

        String driveLetter = path.substring(0, 1);
        String colon = path.substring(1, 2);
        if (!":".equals(colon)) {
            throw new IllegalArgumentException("Expected 'X:': " + path);
        }

        return isNetworkDrive(driveLetter);
    }

    /** Use the command <code>net</code> to determine what this drive is.
     * <code>net use</code> will return an error for anything which isn't a share.
     * 
     *  <p>Another option would be <code>fsinfo</code> but my gut feeling is that
     *  <code>net</code> should be available and on the path on every installation
     *  of Windows.
     */
    private boolean isNetworkDrive(String driveLetter) {
        List<String> cmd = Arrays.asList("cmd", "/c", "net", "use", driveLetter + ":");

        try {
            Process p = new ProcessBuilder(cmd)
                .redirectErrorStream(true)
                .start();

            p.getOutputStream().close();

            StringBuilder consoleOutput = new StringBuilder();

            String line;
            try (BufferedReader in = new BufferedReader(new InputStreamReader(p.getInputStream()))) {
                while ((line = in.readLine()) != null) {
                    consoleOutput.append(line).append("\r\n");
                }
            }

            int rc = p.waitFor();
//            System.out.println(consoleOutput);
//            System.out.println("rc=" + rc);
            return rc == 0;
        } catch(Exception e) {
            throw new IllegalStateException("Unable to run 'net use' on " + driveLetter, e);
        }
    }