InputStream 转换成byte

//InputStream 转换成byte[]
public static final int BUFFER_SIZE = 1024;

public byte[] getBytes(InputStream is) throws IOException {

   ByteArrayOutputStream baos = new ByteArrayOutputStream();
   byte[] b = new byte[BUFFER_SIZE];
   int len = 0;

   while ((len = is.read(b, 0, BUFFER_SIZE)) != -1) {
    baos.write(b, 0, len);
   }

   baos.flush();

   byte[] bytes = baos.toByteArray();

   System.out.println(new String(bytes));

   return bytes;
}