Question

我可以使用不受支持的sun.awt.shell.ShellFolder类来获取装入的卷信息，但是我们宁愿使用受支持的类。看来nio类应该支持这一点，但是我不知道如何。

我在Win 7上运行Java 8。使用下面的代码，ShellFolder类提供有关已安装卷的此信息：

  Z:\
  Title[0] = Name, val = MetrixAutomatedTestDataFiles (\\fcna02) (Z:)
  Title[1] = Size, val = Network Drive
  Title[2] = Item type, val = 1.46 TB
  Title[3] = Date modified, val = 645 GB
  Title[4] = Date created, val = NTFS
  Title[5] = Date accessed, val = 
  Title[6] = Attributes, val = \\fcna02\MetrixAutomatedTestDataFiles
  Title[7] = Offline status, val = ‎57%
  Title[8] = Offline availability, val = ‎645 GB free of 1.46 TB

项目6是我需要的信息。

当我尝试使用nio FileStore类时，除了最基本的信息外，它无法提供其他任何信息。

   (Z:)                   1572025140    895400568    676624572
    (Z:)
        attr=owner, Supported
        attr=owner, NOT VALID
        attr=dos, Supported
        attr=dos, NOT VALID
        attr=acl, Supported
        attr=acl, NOT VALID
        attr=basic, Supported
        attr=basic, NOT VALID
        attr=user, Supported
        attr=user, NOT VALID

supportsFileAttributeView为true的属性无效。

package com.metrixsoftware.build;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.FileSystems;
import java.util.Set;
import sun.awt.shell.ShellFolder;
import sun.awt.shell.ShellFolderColumnInfo;

public class Junk1 {

    public static void main(final String[] args) {
        System.out.println("--- Using ShellFolder ---");
        File[] roots = File.listRoots();

        for (File file : roots) {
            System.out.println(file.getAbsolutePath());
            try {
                ShellFolder sf = ShellFolder.getShellFolder(file);
                ShellFolderColumnInfo[] cols = sf.getFolderColumns();

                for (int idx = 0; (idx < cols.length); idx++) {
                    ShellFolderColumnInfo col = cols[idx];
                    Object val = sf.getFolderColumnValue(idx);
                    if (val != null) {
                        System.out.println("Title[" + idx + "] = " + col.getTitle() + ", val = " + val);
                    }
                }
            } catch (FileNotFoundException e) {
                System.out.println(" ERROR: " + e.getMessage());

            } finally {

            }
        }

        System.out.println("\n--- Using FileStore from Default FileSystems ---");
        Set<String> attributes = FileSystems.getDefault().supportedFileAttributeViews();

        for (FileStore fstore : FileSystems.getDefault().getFileStores()) {
            try {
                long total = fstore.getTotalSpace() / 1024;
                long used = (fstore.getTotalSpace() - fstore.getUnallocatedSpace()) / 1024;
                long avail = fstore.getUsableSpace() / 1024;
                System.out.format("%-20s %12d %12d %12d%n", fstore, total, used, avail);

                System.out.println("\t" + fstore);
                for (String attr : attributes) {
                    try {
                        if (fstore.supportsFileAttributeView(attr)) {
                            System.out.println("\t\tattr=" + attr + ", Supported");
                            try {
                                System.out.println("\t\tattr=" + attr + ", value=" + fstore.getAttribute(attr));
                            } catch (UnsupportedOperationException ex) {
                                System.out.println("\t\tattr=" + attr + ", NOT VALID");
                            }
                        } else {
                            System.out.println("\t\tattr=" + attr + ", NOT SUPPORTED");
                        }
                    } catch (IOException e) {
                        System.out.println("\t\tattr=" + attr + ", INVALID");
                    }
                }

            } catch (IOException e) {
                System.out.println(" ERROR: " + e.getMessage());

            } finally {

            }
        }
    }
}

是否可以使用nio获取卷挂载信息？

Answer 1

Java不提供访问装载信息的内置方法。您将必须使用Runtime.exec()来运行诸如Windows Diskpart之类的系统命令。

如何使用nio类获取已安装卷信息

1 个答案: