..

src/main/java/io/renren/modules/app/controller/QRCodeTest.java

		ServletOutputStream out = response.getOutputStream();
		// ImageIO.write(image, "jpg", out);
		qRCodeUtils.encode(text, out);
		IOUtils.closeQuietly(out);
		try{
			qRCodeUtils.encode(text, out);
			IOUtils.closeQuietly(out);
		}catch(Exception e){
			e.printStackTrace();
		}
    }
}