@dark3212 这个我试过 挂载出来好像不行，Java 依然只能读取本地磁盘，用 File （"\\网络路径文件夹"）可以读取到网络路径文件所在磁盘剩余大小：
File win = new File("\\\\192.xxx.xxx.xxx\\share");
System.out.println(win.getPath());
System.out.println(win.getName());
System.out.println("Free space = " + (win.getFreeSpace() / (1024 * 1024)) / 1024 + "G");
// 显示 GB 大小
System.out.println("Free space = " + win.getFreeSpace());
System.out.println("Usable space = " + win.getUsableSpace());
System.out.println("Total space = " + win.getTotalSpace());