How to display buffered image in JSF without writing image on disk?

问题

I have a buffered image and I need to display it in a JSF page. Is there any UI component available which can display a buffered image directly? I am using JSF 2.2.

回答1:

If you only have the buffered image, you could use the Omnifaces library to which allows you to render images by passing a byte[] to the component

<o:graphicImage value="#{bean.image}" dataURI="true" />

If you have the buffered image you could convert to byte array like so:

ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write([image],[image_extension], baos);
byte[] imageToPassAsValueAttr = baos.toByteArray();

You could also create a servlet to receive the image id as a get request and from that point on you can get the parameter value, find the resource and write the image content to response.

@BalusC has a nice example here

来源：https://stackoverflow.com/questions/40436058/how-to-display-buffered-image-in-jsf-without-writing-image-on-disk