利用Java获取磁盘基本信息

package main;

import java.io.IOException;
import java.nio.file.FileStore;
import java.nio.file.FileSystems;
import java.nio.file.Files;
import java.nio.file.Path;
import java.text.DecimalFormat;
import java.util.HashMap;

/**
 * 使用Java获取磁盘基本信息.
 * @author Denvo
 */
public class Main {
    public static void main(String[] args) {
        System.out.print(\"\n");
        Iterable roots = FileSystems.getDefault().getRootDirectories();   //获取所有的磁盘的根目录.
        for (Path root : roots) {
            System.out.println(root.toString() + "信息:" + getDiskInfo(root));   //getDiskInfo()方法在下面实现.
        }
    }

    /**
     * 根据卷根目录获取卷的信息.
     * @param root 根目录,如"C:\","D:\"
     * @return 包含卷的信息的HashMap.
     */
    private static HashMap getDiskInfo(Path root) {
        HashMap result = new HashMap(8);
        try {
            FileStore fs = Files.getFileStore(root);
            result.put("卷标", fs.name());
            result.put("文件存储类型", fs.type());
            result.put("只读", String.valueOf(fs.isReadOnly()));
            result.put("总容量", autoUnitConversion(fs.getTotalSpace()));   //autoUnitConversion()方法在下面实现.
            result.put("可用容量", autoUnitConversion(fs.getUsableSpace()));
            result.put("每个扇区大小", fs.getBlockSize() + " Bytes");
            //以下仅Windows可用.
            result.put("可移动", fs.getAttribute("volume:isRemovable").toString());
            result.put("是否为CD-ROM", fs.getAttribute("volume:isCdrom").toString());
        } catch (IOException e) {
            e.printStackTrace();
        }
        return result;
    }

    /**
     * 单位转换,从Byte转换成Byte,KB,MB,GB,TB,PB,EB等.
     * @param bytesSize 原始大小(Byte)
     * @return 换算之后的大小(自动添加单位)
     */
    private static String autoUnitConversion(long bytesSize) {
        if (bytesSize < 0) {
            return "0";
        } else {
            double before = bytesSize;
            double after;
            for (int i = 0; i < 7; i++) {
                after = before / 1024;
                if (after < 1) {
                    String unit = switch (i) {
                        case 0 -> " Bytes";
                        case 1 -> " KB";
                        case 2 -> " MB";
                        case 3 -> " GB";
                        case 4 -> " TB";
                        case 5 -> " PB";
                        case 6 -> " EB";
                        default -> null;
                    };
                    return new DecimalFormat("#.##").format(before) + unit;   //这里设置保留2位小数.
                } else {
                    before = after;
                }
            }
            return "8 EB或更大";   //long类型的最大值换算过来最大只有8EB.(正常情况下都应该从上面for循环中return.)
        }
    }
}