问阅读pdf文件

EN

ContentReader reader = contentService.getReader(nodeRef, ContentModel.PROP_CONTENT);
       String content="";
        if (reader != null && reader.exists())
        {
                // get the transformer
                ContentTransformer transformer = contentService.getTransformer(reader.getMimetype(), MimetypeMap.MIMETYPE_TEXT_PLAIN);
                // is this transformer good enough?
                if (transformer != null)
                {
                    // We have a transformer that is fast enough
                    ContentWriter writer = contentService.getTempWriter();
                    writer.setMimetype(MimetypeMap.MIMETYPE_TEXT_PLAIN);

                    try
                    {
                        transformer.transform(reader, writer);
                        // point the reader to the new-written content
                        reader = writer.getReader();
                        // Check that the reader is a view onto something concrete
                        if (!reader.exists())
                        {
                            logging(new ContentIOException("The transformation did not write any content, yet: \n"
                                    + "   transformer:     " + transformer + "\n" + "   temp writer:     " + writer+"")+"");

                            throw new ContentIOException("The transformation did not write any content, yet: \n"
                                    + "   transformer:     " + transformer + "\n" + "   temp writer:     " + writer);

                        }else {
                               content = reader.getContentString();
                               logging("------------------------------------------------------------");
                               logging(content);
                        }
                    }
                    catch (ContentIOException e)
                    {


                    }
                }
            }