使用Java创建指定大小的空文件夹

/**

方法一
* 创建固定大小的文件
* @param file
* @param length
* @throws IOException
*/
public static void createFixLengthFile(File file, long length) throws IOException{
long start = System.currentTimeMillis();
FileOutputStream fos = null;
FileChannel output = null;
try {
fos = new FileOutputStream(file);
output = fos.getChannel();
output.write(ByteBuffer.allocate(1), length-1);
} finally {
try {
if (output != null) {
output.close();
}
if (fos != null) {
fos.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
long end = System.currentTimeMillis();
System.out.println("total times "+(end-start));
}

/*

*第二种方法

*/

public static void create(File file, long length) throws IOException{
long start = System.currentTimeMillis();
RandomAccessFile r = null;
try {
r = new RandomAccessFile(file, "rw");
r.setLength(length);
} finally{
if (r != null) {
try {
r.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
long end = System.currentTimeMillis();
System.out.println(end-start);

}