FileOperationEncoder.java 文件源码

private static Object toContent(Object content) {

        if (content instanceof File) {
            File file = (File) content;
            return new DefaultFileRegion(file, 0, file.length());
        }

        if (content instanceof InputStream) {
            return new ChunkedStream((InputStream) content);
        }

        if (content instanceof ReadableByteChannel) {
            return new ChunkedNioStream((ReadableByteChannel) content);
        }

        if (content instanceof byte[]) {
            return Unpooled.wrappedBuffer((byte[]) content);
        }

        throw new IllegalArgumentException(
            "unknown content type : " + content.getClass().getName());
    }