使用java获取驱动器信息时 [英] when getting drive information using java

问题描述

我尝试了以下程序

import java.io.*;
class dr
{     
  public static void main(String args[])
    {
      try{
           File[] roots = File.listRoots();     
           for (int index = 0; index < roots.length; index++)    
           { //Print out each drive/partition          
            System.out.println(roots[index].toString());    
           }
         }
      catch(Exception e)
        { 
         System.out.println("error   " +e);
        }
    }
}

但在我的系统软盘驱动器中未连接
我收到如下消息

but in my system floppy drive is not connected and i am getting a message like the following

驱动器尚未准备好使用;其门可能已打开，请检查驱动器A ：并确保已插入磁盘并且驱动器门已关闭
然后显示三个选项取消，再次尝试，当我尝试继续时继续
，它工作
但我怎么能避免使用msg

" The drive is not ready for use;its door may be open,Please check drive A: and make sure that disk is inserted and that the drive door is closed" then three options are shown cancel,try again,continue when i try continue,it works but how i could avoid that msg

推荐答案

说到Windows，这个类 WindowsAltFileSystemView 提出了一个基于FileSystemView的替代方案

When it comes to Windows, this class WindowsAltFileSystemView proposes an alternative based on FileSystemView

这个类是必要的，因为在Windows NT上使用默认的 FileSystemView JFileChooser 时会出现烦人的错误c>每次都会导致驱动器A：未准备好错误。

I从1.3 SDK中获取Windows FileSystemView impl并修改它*以便不使用 java.io.File.listRoots（）获取fileSystem根目录。

This class is necessary due to an annoying bug on Windows NT where instantiating a JFileChooser with the default FileSystemView will cause a "drive A: not ready" error every time.
I grabbed the Windows FileSystemView impl from the 1.3 SDK and modified it so * as to not use java.io.File.listRoots() to get fileSystem roots.

java.io.File.listRoots（）执行 SecurityManager。 checkRead（）这导致操作系统尝试访问驱动器 A：即使没有磁盘，也会导致烦人的<每次我们实例化一个 JFileChooser 时，code> abort，retry，ignore 弹出消息！

java.io.File.listRoots() does a SecurityManager.checkRead() which causes the OS to try to access drive A: even when there is no disk, causing an annoying "abort, retry, ignore" popup message every time we instantiate a JFileChooser!

所以这里的想法是扩展 FileSystemView ，替换 getRoots（）方法：

So here, the idea is to extends FileSystemView, replacing the getRoots() method with:

   /**
     * Returns all root partitians on this system. On Windows, this
     * will be the A: through Z: drives.
     */
    public File[] getRoots() {
        Vector rootsVector = new Vector();

        // Create the A: drive whether it is mounted or not
        FileSystemRoot floppy = new FileSystemRoot("A" + ":" + "\\");
        rootsVector.addElement(floppy);

        // Run through all possible mount points and check
        // for their existance.
        for (char c = 'C'; c <= 'Z'; c++) {
            char device[] = {c, ':', '\\'};
            String deviceName = new String(device);
            File deviceFile = new FileSystemRoot(deviceName);
            if (deviceFile != null && deviceFile.exists()) {
                rootsVector.addElement(deviceFile);
            }
        }
        File[] roots = new File[rootsVector.size()];
        rootsVector.copyInto(roots);
        return roots;
    }

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