java 获取文件夹大小，文件大小，文件个数的代码

java 获取文件夹大小，文件大小，文件个数。代码如下：

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;      }      // 递归      public long getFileSize(File f)throws Exception//取得文件夹大小      {          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) {//转换文件大小          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){//递归求取目录文件个数          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()) { //如果路径是文件夹的时候                  System.out.println("文件个数           " + g.getlist(ff));                  System.out.println("目录");                  l = g.getFileSize(ff);                  System.out.println(path + "目录的大小为：" + g.FormetFileSize(l));              } else {                  System.out.println("     文件个数           1");                  System.out.println("文件");                  l = g.getFileSizes(ff);                  System.out.println(path + "文件的大小为：" + g.FormetFileSize(l));              }                       } catch (Exception e)          {              e.printStackTrace();          }          long endTime = System.currentTimeMillis();          System.out.println("总共花费时间为：" + (endTime - startTime) + "毫秒...");      }  }