java - com.gargoylesoftware.htmlunit.ElementNotFoundException : elementName=[form] attributeName=[name] attributeValue=[docSearch]

Question

我正在尝试访问 https://eagletw.mohavecounty.us/treasurer/treasurerweb/search.jsp 的 docSearch 形式使用最新 HTMLUnit 版本 (2.37.0) 的网页。正如您使用 Firefox 的 DOM Inspector 所看到的，有这样一个表单

WebClient webClient = new WebClient();
webClient.getOptions().setJavaScriptEnabled(true);
webClient.getOptions().setThrowExceptionOnScriptError(false);
webClient.setRefreshHandler(new RefreshHandler() {
    public void handleRefresh(Page page, URL url, int arg) throws IOException {
        System.out.println("handleRefresh");
    }
});
HtmlPage page = (HtmlPage) webClient.getPage("https://eagletw.mohavecounty.us/treasurer/treasurerweb/search.jsp");
webClient.waitForBackgroundJavaScript(1000000);
webClient.waitForBackgroundJavaScriptStartingBefore(100000);
webClient.setAjaxController(new NicelyResynchronizingAjaxController());
page.getEnclosingWindow().getJobManager().waitForJobs(1000000);
webClient.setAjaxController(new NicelyResynchronizingAjaxController());
webClient.waitForBackgroundJavaScriptStartingBefore(1000000);
HtmlForm form = page.getFormByName("docSearch");  

上面代码的最后一行给出了以下异常:

com.gargoylesoftware.htmlunit.ElementNotFoundException: elementName=[form] attributeName=[name] attributeValue=[docSearch]

关于我可以在代码中尝试什么来访问 docSearch 表单，有什么建议吗？您认为这是 HTMLUnit 本身的问题吗？我应该将此问题作为问题提交到 HTMLUnit 的 GitHub 网站上吗？

Answer 1

为此花费了一些时间来构建完整的示例。该页面只能在美国使用 - 我必须设置一个 VPN 才能访问该页面。示例包含一些提示；希望有帮助。

final String url = "https://eagletw.mohavecounty.us/treasurer/treasurerweb/search.jsp";

try (final WebClient webClient = new WebClient()) {
    webClient.getOptions().setThrowExceptionOnScriptError(false);
    // webClient.getOptions().setUseInsecureSSL(true);

    // open the url, this will do a redirect to the login page
    HtmlPage page = webClient.getPage(url);
    // System.out.println(page.asXml());
    // System.out.println("--------------------------------");

    // click the Public User Login
    for (DomElement elem : page.getElementById("middle_left").getElementsByTagName("input")) {
        if (elem instanceof HtmlSubmitInput
                && "Login".equals(((HtmlSubmitInput) elem).getValueAttribute())) {
            page = elem.click();
            break;
        }
    }
    // System.out.println(page.asXml());
    // System.out.println("--------------------------------");

    // search by owner name
    HtmlInput ownerInput = (HtmlInput) page.getElementById("TaxAOwnerIDSearchString");
    ownerInput.type("Trump");
    // click submit
    for (DomElement elem : page.getElementsByTagName("input")) {
        if (elem instanceof HtmlSubmitInput) {
            page = elem.click();
        }
    }
    // System.out.println(page.asXml());
    // System.out.println("--------------------------------");

    System.out.println(page.asText());