Java已知InputStream長度，將其轉換為byte[]

/** * Transfer java.io.InpuStream to byte array. * @param inStream, input stream of the uploaded file. * @param fileLength, the length of the file. * @return the byte array transferred from java.io.Inputstream. * @throws IOException occurred by the method read(byte[]) of java.io.InputStream. */private byte[] getFileBuffer(InputStream inStream, long fileLength) throws IOException {byte[] buffer = new byte[256 * 1024];byte[] fileBuffer = new byte[(int) fileLength];int count = 0;int length = 0;    while((length = inStream.read(buffer)) != -1){for (int i = 0; i < length; ++i)    {        fileBuffer[count + i] = buffer[i];    }    count += length;}return fileBuffer;}