我可以使用HtmlUnit监听资源加载事件吗?

问题描述：

我正在尝试使用HtmlUnit来检测无法加载到网页上的资源(脚本，图像，样式表等).

I'm trying to use HtmlUnit to detect resources (scripts, images, stylesheets, etc) that fail to load on a webpage.

我尝试过

new WebConnectionWrapper(webClient) {
    @Override
    public WebResponse getResponse(WebRequest request) throws IOException {
        WebResponse response;
        response = super.getResponse(request);
        System.out.println(response.getStatusCode());
        return response;
    }
};

无济于事.尽管有HtmlUnit日志记录，它似乎也不能处理CSS，图像或JS:

to no avail. It doesn't seem to handle CSS, images or JS, despite HtmlUnit logging:

statusCode = [404] contentType = [text/html] 文件:/resources/style.css

statusCode=[404] contentType=[text/html] File: /resources/style.css

作为参考，这是我正在加载的文件:

For reference, here's the file I'm loading:

<!DOCTYPE html>
<html>
    <head>
        <title>Test</title>
        <script type='text/javascript'>
            var xhr = new XMLHttpRequest();
            xhr.open("get", "someBadLink", true);
            xhr.send();
        </script>
        <link href="/resources/style.css" rel="stylesheet"/>
    </head>

    <body>
        <img src="bad_image.png">
    Cool.
    </body>
</html>

是否可以使用HtmlUnit检测所有404的AJAX资源，CSS脚本和图像?

Is there any way to use HtmlUnit to detect the AJAX resource, CSS script and image that all 404?

答

对于AJAX，您必须等待此处.
HtmlUnit不会自动加载 HtmlLink 和 HtmlImage ，出于性能原因.
请在下面的代码段中将其全部打印出来.您可以使用 .getByXPath( )以获取所有元素的列表.

For AJAX, you have to wait as hinted here.
HtmlUnit doesn't automatically loads HtmlLink and HtmlImage, for performance reasons.
Please find below snippet that will print all. You can use .getByXPath() to get list of all elements.

public static void main(String[] args) throws Exception {
    try (final WebClient webClient = new WebClient()) {

        new WebConnectionWrapper(webClient) {
            @Override
            public WebResponse getResponse(WebRequest request) throws IOException {
              WebResponse response = super.getResponse(request);
              System.out.println(request.getUrl());
              System.out.println(response.getStatusCode());
              return response;
            }
        };

        String url = "http://localhost/test.html";
        HtmlPage page = webClient.getPage(url);

        // to wait for AJAX
        webClient.waitForBackgroundJavaScript(3000);

        // to forcibly load the link
        HtmlLink link = page.getFirstByXPath("//link");
        link.getWebResponse(true);

        // to forcibly load the image
        HtmlImage image = page.getFirstByXPath("//img");
        image.getImageReader();
    }
}

我可以使用HtmlUnit监听资源加载事件吗?

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