다섯째, ByteArrayHttpMessageConverter

자원 담당

public class ByteArrayHttpMessageConverter extends AbstractHttpMessageConverter<byte[]> {

	/**
	 * //默认支持的MediaType是application/octet-stream，”*/*“
	 */
	public ByteArrayHttpMessageConverter() {
		super(MediaType.APPLICATION_OCTET_STREAM, MediaType.ALL);
	}

   //入参是byte[]
	@Override
	public boolean supports(Class<?> clazz) {
		return byte[].class == clazz;
	}

	@Override
	public byte[] readInternal(Class<? extends byte[]> clazz, HttpInputMessage inputMessage) throws IOException {
		long contentLength = inputMessage.getHeaders().getContentLength();
		ByteArrayOutputStream bos =
				new ByteArrayOutputStream(contentLength >= 0 ? (int) contentLength : StreamUtils.BUFFER_SIZE);
		StreamUtils.copy(inputMessage.getBody(), bos);
		return bos.toByteArray();
	}

	@Override
	protected Long getContentLength(byte[] bytes, @Nullable MediaType contentType) {
		return (long) bytes.length;
	}

	@Override
	protected void writeInternal(byte[] bytes, HttpOutputMessage outputMessage) throws IOException {
		StreamUtils.copy(bytes, outputMessage.getBody());
	}

}