java file物件獲取檔案大小
import java.text.DecimalFormat;
import java.io.FileInputStream;
public class GetFileSize
{
public longgetFileSizes(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
public longgetFileSize(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;
}
publicString 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 longgetlist(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;
}
publicstatic 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));
}