FileTool.java

package net.loyin.util;

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

public class FileTool {
	public long folderCount;
	public long flieCount;
	public long totalSize;
	/**
	 * 取文件大小
	 * @param f
	 * @return
	 * @throws Exception
	 */
	public long getFileSize(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;
    }
	/**
	 * 文件夹大小
	 * @param f
	 * @return
	 * @throws Exception
	 */
    // 递归
    public void getFolderSize(File f)throws Exception//取得文件夹大小
    {
        File flist[] = f.listFiles();
        for (File fc: flist)
        {
            if (fc.isDirectory())
            {	folderCount++;
            	getFolderSize(fc);
            } else
            {	flieCount++;
            	totalSize += fc.length();
            }
        }
    }

    public String FormetFileSize(long fileS) {//转换文件大小
        DecimalFormat df = new DecimalFormat("#.000");
        String fileSizeString = "";
        if (fileS < 1024) {
            fileSizeString = df.format((double) fileS) + "B";
        } else if (fileS < 1048576) {
            fileSizeString = df.format((double) fileS / 1024) + "KB";
        } else if (fileS < 1073741824) {
            fileSizeString = df.format((double) fileS / 1048576) + "MB";
        } else {
            fileSizeString = df.format((double) fileS / 1073741824) + "GB";
        }
        return fileSizeString;
    }

    public static void main(String args[])
    {
    	FileTool g = new FileTool();
        long startTime = System.currentTimeMillis();
        try
        {
            long l = 0;
            String path = "E:\\temp";
            File ff = new File(path);
            g.getFolderSize(ff);
            System.out.println(g.FormetFileSize(g.totalSize));
            System.out.println(g.flieCount);
            System.out.println(g.folderCount);
           
        } catch (Exception e)
        {
            e.printStackTrace();
        }
        long endTime = System.currentTimeMillis();
        System.out.println("总共花费时间为：" + (endTime - startTime) + "毫秒...");
    }
}