@Override
    public List<File> collect(Date date) {
        List<String> hrefs = new ArrayList<>();
        try {
            LOG.debug("url: "+url);
            String paper = url + sf.format(date) + start;
            LOG.debug("paper: "+paper);
            Document document = Jsoup.connect(paper).get();
            
            LOG.debug("pdfCssQuery: " + pdfCssQuery);
            Elements elements = document.select(pdfCssQuery);
            int count=0;
            for(Element element : elements){
                String text = element.text();
                if(text != null && text.startsWith("第")){
                    LOG.debug("报纸文本："+text);
                    count++;
                }else{
                    LOG.debug("不是报纸文本："+text);
                }
            }
            //有的版面缺失，而文件名是顺序递增的
            for(int i=1; i<=count; i++){
                String seq = Integer.toString(i);
                if(i<10){
                    seq="0"+seq;
                }
                hrefs.add(paperPath + sf.format(date) + "page_"+seq+".jpg");
            }
        } catch (IOException ex) {
            LOG.error("采集出错",ex);
        }
        return downloadPaper(hrefs);
    }