代码之家 › 专栏 › 技术社区 › Almas Abdrazak

如何用HtmlUnit显示所有AJAX请求

htmlunit web-crawler java

Almas Abdrazak · 技术社区 · 7 年前

https://www.upwork.com/o/jobs/browse/?q=Java&sort=renew_time_int%2Bdesc

如果您查看DeveloperConsole->Network,您将看到以下列表

这是我的密码:

public static void main(String[] args) throws IOException {
        final WebClient webClient = configWebClient();
        final List<String> list = new ArrayList<>();
        new WebConnectionWrapper(webClient) {
            @Override
            public WebResponse getResponse(final WebRequest request) throws IOException {
                final WebResponse response = super.getResponse(request);
                list.add(request.getUrl().toString());
                return response;
            }
        };
        webClient.getPage("https://www.upwork.com/ab/find-work/");
        list.forEach(System.out::println); 
    }

    private static WebClient configWebClient() {
        WebClient webClient = new WebClient(BrowserVersion.FIREFOX_60);

        webClient.getOptions().setJavaScriptEnabled(true);
        webClient.waitForBackgroundJavaScriptStartingBefore(5_000);
        webClient.waitForBackgroundJavaScript(3_000);
        webClient.getOptions().setCssEnabled(false);
        webClient.getOptions().setRedirectEnabled(true);
        webClient.getOptions().setUseInsecureSSL(false);
        webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
        webClient.getOptions().setThrowExceptionOnScriptError(false);
        webClient.getCookieManager().setCookiesEnabled(true);
        webClient.setAjaxController(new AjaxController());
        webClient.getOptions().setThrowExceptionOnScriptError(false);
        webClient.getCookieManager().setCookiesEnabled(true);
        return webClient;
    }

这是输出

https://www.upwork.com/o/jobs/browse/?q=Java&sort=renew_time_int%2Bdesc
https://www.upwork.com/o/jobs/browse/?q=Java
https://www.upwork.com:443/o/jobs/browse/js/328ecc3.js?4af40b2
https://www.googletagmanager.com/gtm.js?id=GTM-5XK7SV
https://client.perimeterx.net/PXSs13U803/main.min.js
https://assets.static-upwork.com/components/11.4.0/core.11.4.0.air2.min.js
https://assets.static-upwork.com/global-components/@latest/ugc.js
https://assets.static-upwork.com/global-components/@latest/ugc/ugc.6jcmqb32.js
https://www.upwork.com:443/static/jsui/JobSearchUI/assets/4af40b2/js/55260a3.js

如您所见,它不包含xhr调用。我做错什么了?

1 回复 | 直到 7 年前

RBRi 7 年前

你的qestions使用了两个不同的URL;希望我用对了

正如这里多次提到的;.waitForBackground。。。方法不是选项,您必须在调用某些web请求之后调用它们
AJAX中的A表示异步;webClient.getPage()是一个sync调用,意味着您必须等待所有javascript完成

在使用HtmlUnit时调用页面似乎会产生一些js错误。可能这会导致无法执行此页面中的所有javascript代码(仍有一些javascript特性不受HtmlUnit(Rhino)支持;欢迎提供任何帮助)

public static void main(String[] args) throws IOException {
    final WebClient webClient = new WebClient(BrowserVersion.FIREFOX_60);
    webClient.getOptions().setThrowExceptionOnScriptError(false);

    final List<String> list = new ArrayList<>();

    new WebConnectionWrapper(webClient) {
        @Override
        public WebResponse getResponse(final WebRequest request) throws IOException {
            final WebResponse response = super.getResponse(request);
            list.add(request.getHttpMethod() + " " + request.getUrl());
            return response;
        }
    };

    webClient.getPage("https://www.upwork.com/o/jobs/browse/?q=Java&sort=renew_time_int%2Bdesc");
    webClient.waitForBackgroundJavaScript(10_000);
    list.forEach(System.out::println); 
}