Java是否有一种独立于平台的方法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 U 盘)和网络共享。JNI/JNA 解决方案不会有帮助。可以假设 Java 7。
4 回答
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
Swing 中的FileSystemView
类有一些功能来支持检测驱动器的类型(cf isFloppyDrive
, isComputerNode
)。恐怕没有标准的方法来检测驱动器是否通过 USB 连接。
人为的,未经测试的例子:
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。我没用过,但是FileStore
API有type
方法。文档说:
此方法返回的字符串格式是高度特定于实现的。例如,它可以指示使用的格式或文件存储是本地的还是远程的。
显然使用它的方法是这样的:
import java.nio.*;
....
for (FileStore store: FileSystems.getDefault().getFileStores()) {
System.out.printf("%s: %s%n", store.name(), store.type());
}
这是一个要点,它显示了如何使用以下方法确定这一点net use
: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);
}
}
看看这个讨论:如何获取所有驱动器的列表,同时也获取相应的驱动器类型(可移动、本地磁盘或 cd-rom、dvd-rom 等)?
具体关注http://docs.oracle.com/javase/1.5.0/docs/api/javax/swing/filechooser/FileSystemView.html
我个人没有使用过这个,但它似乎相关。它有类似 is 的方法isFloppyDrive
。
也看看JSmooth