src/org/nutz/mvc/view/RawView.java
else if (obj instanceof InputStream) {
            OutputStream out = resp.getOutputStream();
            Streams.writeAndClose(out, (InputStream) obj);
        }
else if (obj instanceof InputStream) {
            OutputStream out = resp.getOutputStream();
            Streams.writeAndClose(out, (InputStream) obj);
        }
二进制流