爬虫抓取百度链接返回数量不够

爬虫初学者一枚，用java的webmagic框架抓取百度搜索结果，利用servlet传要搜索的关键字，做好了解析和相关的流程调度工作。
现在要爬取百度前10页返回的信息，每页有10条，期望返回100条信息，但是每次只返回90条左右，不知道为什么会有链接丢失。望大神解答，关键代码如下：

  public void processWithException(Page page) throws MalformedURLException {
        Html html = page.getHtml();

        if(page.getRequest().getUrl().endsWith("&pn=0&ie=utf8")){
            name = (String)page.getRequest().getExtra("name");
            List<String> pag = html.xpath("//div[@id='page']/a/@href").all();
            if(html.xpath("//div[@id='page']/a/@href").toString()!=null){
                if(html.xpath("//div[@id='page']/a/@href").all().size()>=5){
                    for(int i=0;i<9;i++){
                        String pagination = pag.get(i);
                        page.addTargetRequest(pagination);
                    }
                }
                else {
                    for(int i=0;i<html.xpath("//div[@id='page']/a/@href").all().size();i++){
                        String pagination = pag.get(i);
                        page.addTargetRequest(pagination);
                    }
                }
            }
            String eqid = StringUtils.substringBetween(page.getHtml().toString(),"bds.comm.eqid = \"","\";");
            List<String> url = html.xpath("//div[@class='c-container']/h3/a/@href").all();
            for(int i=0;i<url.size();i++){
                String url_temp = url.get(i).replace("http","https")+"&wd=&eqid="+eqid;
                page.addTargetRequest(url_temp);
            }
        }
        else if(page.getRequest().getUrl().startsWith("http://www.baidu.com/s?wd=")){
            String eqid = StringUtils.substringBetween(page.getHtml().toString(),"bds.comm.eqid = \"","\";");
            List<String> url = html.xpath("//div[@class='c-container']/h3/a/@href").all();
            for(int i=0;i<url.size();i++){
                String url_temp = url.get(i).replace("http","https")+"&wd=&eqid="+eqid;
                page.addTargetRequest(url_temp);
            }
        }

        else if(page.getRequest().getUrl().startsWith("https://www.baidu.com/link")){
            String url_real = StringUtils.substringBetween(page.getHtml().toString(),"URL=\'","\'");
            page.addTargetRequest(url_real);

        }
        else if(!page.getRequest().getUrl().startsWith("http://www.baidu.com/s?wd=")&&
                !page.getRequest().getUrl().startsWith("https://www.baidu.com/link")){
            Baidu_FilterUtils baiduFilterUtils = new Baidu_FilterUtils();
            baiduFilterUtils.BaiduPassKeyWord(page,name,programList);
            baiduFilterUtils.BaiduContainWebsites(page,name,programList_websites);
            baiduFilterUtils.BaiduContainDownload(page,name,programList_download);
            baiduFilterUtils.BaiduContainsPass(page,name,programList_pass);
        }
    }