Java获取文件大小

public static class GetFileSize
{
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) {


// File file = new File("E:/tomacat/apache-tomcat-6.0.14/webapps/share/attached/image/share/20111018/1318925123906.jpg");
//         FileInputStream fis = null;
//         try{
//             fis = new FileInputStream(file); 
//             System.out.println("文件size:"+String.valueOf((double)fis.available()/1024)+"K");
////             fileSizeString = df.format((double) fileS / 1048576) + "M";
//
//         }catch(IOException e1){  
//             System.out.println("IO出错！");
//         }

GetFileSize g = new GetFileSize();
long startTime = System.currentTimeMillis();
try
{
long l = 0;
String path = "E:/tomacat";
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...");
}


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评论

1 楼 macbin 2012-08-15  

给力啊。谢谢