android 文件上传时将file转化为byte[]

 

public static byte[] File2Bytes(File file) {

int byte_size = 1024;

byte[] b = new byte[byte_size];

try {

FileInputStream fileInputStream = new FileInputStream(file);

ByteArrayOutputStream outputStream = new ByteArrayOutputStream(

byte_size);

for (int length; (length = fileInputStream.read(b)) != -1;) {

outputStream.write(b, 0, length);

}

fileInputStream.close();

outputStream.close();

return outputStream.toByteArray();

} catch (IOException e) {

e.printStackTrace();

}

return null;

}

   现在就可以将byte[]上传了。