java htmlunit 抓取网页数据

WebClient webClient=new WebClient(BrowserVersion.CHROME);
            webClient.setJavaScriptTimeout(5000);
            webClient.getOptions().setUseInsecureSSL(true);

            webClient.getOptions().setJavaScriptEnabled(true);
            webClient.getOptions().setCssEnabled(false);
            webClient.getOptions().setThrowExceptionOnScriptError(false);
            webClient.getOptions().setTimeout(100000);
            webClient.getOptions().setDoNotTrackEnabled(false);

            HtmlPage page=webClient.getPage(this.path);
            webClient.waitForBackgroundJavaScript(20000);

            Thread.sleep(5000);

            HtmlDivision div=(HtmlDivision)page.getElementById("forecast");
            String xml=div.asXml();
            if(xml.indexOf("forecast-data-loading")>=0)
            {
                System.out.println("htmlUnit解析页面失败");
            }
            else
            {
                System.out.println("htmlUnit解析页面成功");
                int[] aqis=new int[8];

                int i=0;
                List<HtmlTable> tables=(List<HtmlTable>)div.getByXPath("./div[2]/center[1]/table");
                if(tables.size()==8)
                {
                    for(HtmlTable table : tables)
                    {
                        List<HtmlTableRow> trs=(List<HtmlTableRow>)table.getByXPath("./tbody/tr[4]");
                        HtmlTableRow tr=trs.get(0);

                        int aqi=0;
                        List<HtmlTableCell> cells = (List<HtmlTableCell>)tr.getByXPath("./td");
                        for(HtmlTableCell cell : cells)
                        {
                            String s=cell.asText();
                            String [] values=s.split("\r\n");
                            aqi=aqi+(Integer.parseInt(values[0])+Integer.parseInt(values[1]))/2 ;
                        }
                        aqi=aqi/cells.size();
                        aqis[i]=aqi;
                        i=i+1;
                    }
                }