The document can be rendered along with its associated annotations using the DocumentContentService.retrieveRendition operation. This operation accepts a number of arguments including the documentId and a flag indicating whether or not to include annotations. It also includes a parameter for specify the page set that is to be rendered. Specifying multiple pages for this parameter will results in single, multi-page document containing only those pages. Passing a null, or page zero, for this parameter will render the entire document. Refer the Javadoc for the retrieveRendition for complete details other parameters to the method.
The retrieveRendition method returns a Rendition class instance. The DataHandler containing the document content is accessible from the Rendition.getContent() method.