java 獲取資料夾大小、檔案大小、檔案個數

hyeveryone發表於2012-02-24
Java

轉載自：http://www.csharpwin.net/ddwstp/java/javase/7209dr1597.shtml點選開啟連結

import java.io.File;

import java.text.DecimalFormat;

import java.io.FileInputStream;

public class GetFileSize
{
public long getFileSizes(File f)throws Exception{//取得檔案大小
long s=0;
if (f.exists()) {
FileInputStream fis =null;
fis = new FileInputStream(f);
s= fis.available();
} else {
f.createNewFile();
System.out.println("檔案不存在");
}
return s;
}
// 遞迴
publiclong getFileSize(File f)throws Exception//取得資料夾大小
{
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) {//轉換檔案大小
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){//遞迴求取目錄檔案個數
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()) {//如果路徑是資料夾的時候
System.out.println("檔案個數" + g.getlist(ff));
System.out.println("目錄");
l = g.getFileSize(ff);
System.out.println(path +"目錄的大小為："+ g.FormetFileSize(l));
} else {
System.out.println(" 檔案個數 1");
System.out.println("檔案");
l = g.getFileSizes(ff);
System.out.println(path +"檔案的大小為："+ g.FormetFileSize(l));
}

} catch (Exception e)
{
e.printStackTrace();
}
long endTime= System.currentTimeMillis();
System.out.println("總共花費時間為："+ (endTime - startTime) + "毫秒...");
}
} 
 





            




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