package com.file.util;

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

public class FileUtil {
	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[]) {
		FileUtil g = new FileUtil();
		long startTime = System.currentTimeMillis();
		try {
			long l = 0;
			String path = "F:\\muwen.jpg";
			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...");
	}
}