package cn.edu.hactcm.cfcms.utils;

import java.io.File;

import java.io.FileInputStream;

import java.text.DecimalFormat;

/**

* CFMS    ：Computer files management system

* version ：1.0 2013-3-2 下午03:33:07

*/

public class FileInfoUtils {

/**

* 获得文件类型(文件后缀),要么是文件夹，要么是文件后缀

*

* @param path

* @return

*/

public static String getFileSuffix(String path) {

File file = new File(path);

String info = null;

if (file.isFile()) {

info = path.substring(path.lastIndexOf(".") + 1, path.length())

+ "文件";

}

if (file.isDirectory()) {

info = "文件夹";

}

return info;

}

/**

* 获得文件的大小

*

* @param path

* @return

*/

public static long getFileSize(String path) {

File f = new File(path);

long size = 0;

try {

if (f.exists()) {

if (f.isDirectory()) {

File flist[] = f.listFiles();

for (int i = 0; i < flist.length; i++) {

size = size + getFileSize(flist[i].getPath());

}

} else {

FileInputStream fis = null;

fis = new FileInputStream(f);

size = fis.available();

}

} else {

f.createNewFile();

System.out.println("文件不存在");

}

} catch (Exception e) {

e.printStackTrace();

}

return size;

}

/**

* 转换文件的大小以B,KB,M,G等计算

*

* @param fileS

* @return

*/

public static 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) + "K";

} else if (fileS < 1073741824) {

fileSizeString = df.format((double) fileS / 1048576) + "M";

} else {

fileSizeString = df.format((double) fileS / 1073741824) + "G";

}

return fileSizeString;

}

/**

* 判断选择的是什么类型的单位，并返回该单位代表的Byte值

* @param unit

* @return

*/

public static long judgeUnit(String unit){

Long value;

if (unit.equals("B")) {

value = 1L;

} else if (unit.equals("K")) {

value = 1024L;

} else if (unit.equals("M")) {

value = 1048576L;

} else {

value = 1073741824L;

}

return value;

}

// 获得文件夹内文件的个数。

public static long getFileSize(File f) {

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;

}

}