Java htmlUnit获取xml页面ClassCastException问题

Question

我有一个使用 HtmlUnit 库的 java 应用程序，并且在从 xml 页面获取源代码时遇到问题。我得到的只是一个“ClassCastException”错误。

我正在使用最新的 HtmlUnit 2.15 API 库。

 public static void main(String[] args) {
    WebClient webClient = new WebClient(BrowserVersion.CHROME);
    webClient = new WebClient(BrowserVersion.CHROME);
    webClient.getOptions().setJavaScriptEnabled(true);
    webClient.getOptions().setActiveXNative(false);
    webClient.getOptions().setAppletEnabled(false);
    webClient.getOptions().setCssEnabled(true);
    webClient.getOptions().setPopupBlockerEnabled(true);
    webClient.getOptions().setPrintContentOnFailingStatusCode(false);
    webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
    webClient.getOptions().setThrowExceptionOnScriptError(true);
    webClient.getOptions().setTimeout(100000);
    webClient.getOptions().setThrowExceptionOnScriptError(false);
    webClient.getOptions().setDoNotTrackEnabled(false);
    //webClient.getOptions().setProxyConfig(new ProxyConfig("10.0.0.1", 8080));
    try{    
        HtmlPage page = webClient.getPage("http://www.w3schools.com/xml/note.xml");
        // TODO, add your application code
        System.out.println(page.asXml());

    } catch (Exception e) {
        System.out.println("An error occurs when getting the page: "+e);
    }
}

关于如何通过 htmlunit 库检索 xml 文件并将其保存到文件有什么想法吗？

Answer 1

我终于明白了。

变成我们首先需要导入com.gargoylesoftware.htmlunit.xml.XmlPage;

然后您可以声明 XmlPage 对象，从而避免 ClassCastException 问题。

对于那些刚接触 HtmlUnit 的人来说，我的代码看起来像这样

public static void main(String[] args) {

    WebClient webClient = new WebClient(BrowserVersion.CHROME);

    XmlPage page = null;

    webClient = new WebClient(BrowserVersion.CHROME);
    webClient.getOptions().setJavaScriptEnabled(true);
    webClient.getOptions().setActiveXNative(false);
    webClient.getOptions().setAppletEnabled(false);
    webClient.getOptions().setCssEnabled(true);
    webClient.getOptions().setPopupBlockerEnabled(true);
    webClient.getOptions().setPrintContentOnFailingStatusCode(false);
    webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
    webClient.getOptions().setThrowExceptionOnScriptError(true);
    webClient.getOptions().setTimeout(100000);
    webClient.getOptions().setThrowExceptionOnScriptError(false);
    webClient.getOptions().setDoNotTrackEnabled(false);
    //webClient.getOptions().setProxyConfig(new ProxyConfig("10.0.0.1", 8080));

    try {

        //go to url
        page = webClient.getPage("http://www.w3schools.com/xml/note.xml");
        System.out.println(xpage.asXml());

        //just for test save to file to see results
        File file = new File("result.html");
        FileOutputStream fos = new FileOutputStream(file);

        fos.write(xpage.asXml().getBytes());
        fos.close();
        //end test

    } catch (Exception e) {
        System.out.println("An error occurs when getting the page: "+e);

    }

}