利用JAVA获取电脑的每个盘符大小以及剩余大小

public static String FormetFileSize(long fileS) {
       DecimalFormat df = new DecimalFormat("#.00");
       String fileSizeString = "";
       if (fileS < 1024) {
           fileSizeString = df.format((double) fileS) + "B";
       } else if (fileS < 1048576) {
           fileSizeString = df.format((double) fileS / 1024) + "K";
       } else if (fileS < 1073741824) {
           fileSizeString = df.format((double) fileS / 1048576) + "M";
       } else {
           fileSizeString = df.format((double) fileS / 1073741824) + "G";
       }
       return fileSizeString;
   }

   /**
    * 获取硬盘的每个盘符
    */
   public static void driver(){
       // 当前文件系统类
       FileSystemView fsv = FileSystemView.getFileSystemView();
       // 列出所有windows 磁盘
       File[] fs = File.listRoots();
       // 显示磁盘卷标
       for (int i = 0; i < fs.length; i++) {
           System.out.println(fsv.getSystemDisplayName(fs[i]));
           System.out.print("总大小" + FormetFileSize(fs[i].getTotalSpace()));
           System.out.println("剩余" + FormetFileSize(fs[i].getFreeSpace()));
       }
   }
   public static void main(String[] args) {
    driver();
}