package com.demo.file;
import java.io.File;
import java.text.DecimalFormat;
import java.io.FileInputStream;
public class GetFileSizeUtil {
private static GetFileSizeUtil instance;
public GetFileSizeUtil() {
}
public static GetFileSizeUtil getInstance() {
if (instance == null) {
instance = new GetFileSizeUtil();
}
return instance;
}
/*** 获取文件大小 ***/
public long getFileSizes(File f) throws Exception {
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;
}
/*** 获取文件夹大小 ***/
public long getFileSize(File f) throws Exception {
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;
}
/*** 转换文件大小单位(b/kb/mb/gb) ***/
public String FormetFileSize(long fileS) {
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;
}
/*** 获取文件个数 ***/
public long getlist(File f) {
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;
}
}
