java 獲取文件夾大小，文件大小，文件個數的代碼

java 獲取文件夾大小，文件大小，文件個數。代碼如下：

import java.io.File;
import java.text.DecimalFormat;
import java.io.FileInputStream;

public class GetFileSize
{
    public long getFileSizes(File f) throws Exception{//取得文件大小
        long s=0;
        if (f.exists()) {
            FileInputStream fis = null;
            fis = new FileInputStream(f);
           s= fis.available();
        } else {
            f.createNewFile();
            System.out.println("文件不存在");
        }
        return s;
    }
    // 遞歸
    public long getFileSize(File f)throws Exception//取得文件夾大小
    {
        long size = 0;
        File flist[] = f.listFiles();
        for (int i = 0; i < flist.length; i++)
        {
            if (flist[i].isDirectory())
            {
                size = size + getFileSize(flist[i]);
            } else
            {
                size = size + flist[i].length();
            }
        }
        return size;
    }

public String FormetFileSize(long fileS) {//轉換文件大小
    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;
}

public long getlist(File f){//遞歸求取目錄文件個數
    long size = 0;
    File flist[] = f.listFiles();
    size=flist.length;
    for (int i = 0; i < flist.length; i++) {
        if (flist[i].isDirectory()) {
            size = size + getlist(flist[i]);
            size--;
        }
    }
    return size;



}

public static void main(String args[])
{
    GetFileSize g = new GetFileSize();
    long startTime = System.currentTimeMillis();
    try
    {
        long l = 0;
        String path = "C:\\WINDOWS";
        File ff = new File(path);
        if (ff.isDirectory()) { //如果路徑是文件夾的時候
            System.out.println("文件個數           " + g.getlist(ff));
            System.out.println("目錄");
            l = g.getFileSize(ff);
            System.out.println(path + "目錄的大小為：" + g.FormetFileSize(l));
        } else {
            System.out.println("     文件個數           1");
            System.out.println("文件");
            l = g.getFileSizes(ff);
            System.out.println(path + "文件的大小為：" + g.FormetFileSize(l));
        }

    } catch (Exception e)
    {
        e.printStackTrace();
    }
    long endTime = System.currentTimeMillis();
    System.out.println("總共花費時間為：" + (endTime - startTime) + "毫秒...");
}

}</pre>