HtmlUnit爬取Ajax动态生成的页面内容

public class CrawlerXXX {    
    private static Logger log = Logger.getLogger(CrawlerXXX.class);
    
    public static void main(String[] args){
        WebClient wc = new WebClient(BrowserVersion.BEST_SUPPORTED);  
        wc.getOptions().setTimeout(10000); //设置连接超时时间 ，这里是10S。如果为0，则无限期等待 
        wc.getOptions().setJavaScriptEnabled(true); //启用JS解释器，默认为true  
        wc.setJavaScriptTimeout(10000);//设置JS执行的超时时间
        wc.getOptions().setCssEnabled(false); //禁用css支持  
        wc.getOptions().setThrowExceptionOnScriptError(false); //js运行错误时，是否抛出异常  
        wc.getOptions().setRedirectEnabled(true);
        wc.getOptions().setUseInsecureSSL(true);  
        try {
            HtmlPage mainPage = wc.getPage("xxx");
            HtmlForm form = mainPage.getFormByName("xxx");  
            HtmlTextInput textField = form.getInputByName("varghost"); 
            HtmlSubmitInput button = form.getInputByName("xxx");  
            textField.setValueAttribute("xxx");
            HtmlPage clickedPage = button.click(); 
            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            if( clickedPage.asXml().contains("OK") || mainPage.asXml().contains("OK")){
                Document doc = Jsoup.parse(clickedPage.asXml());
                Element table = doc.getElementById("pingtable");
                Elements trs = table.getElementsByTag("tr");
                int len = trs.size();
                for(int i = 1; i < len; i++){
                    Element td = trs.get(i).getElementsByTag("td").last();
                    String xxx = td.text();
                    if(xxx.length() > 0){
                        System.out.println("xxx"+i+" = " + xxx);
                    }
                }
            }
        } catch (FailingHttpStatusCodeException | IOException e) {
            e.printStackTrace();
        }
    }
}