Question

我正在尝试从网页（显示搜索结果的页面）中提取类项目的数据。具体来说，就是这个页面：

http://www.target.com/c/xbox-one-games-video/-/N-55krw#navigation=true&category=55krw&searchTerm=&view_type=medium&sort_by=bestselling&faceted_value=&offset=60&pageCount=60&response_group=Items&isLeaf=true&parent_category_id=55kug&custom_price=false&min_price=from&max_price=to

我只是想提取产品的标题。

我使用以下代码：

final WebClient webClient = new WebClient(BrowserVersion.CHROME);
webClient.getOptions().setThrowExceptionOnScriptError(false);
webClient.getOptions().setJavaScriptEnabled(true);
webClient.setAjaxController(new NicelyResynchronizingAjaxController());
final HtmlPage page = webClient.getPage(itemPageURL);
int tries = 20;  // Amount of tries to avoid infinite loop
while (tries > 0) {
    tries--;
    synchronized(page) {
       page.wait(2000);  // How often to check
    }
}
int numThreads = webClient.waitForBackgroundJavaScript(1000000l);

PrintWriter pw = new PrintWriter("test-target-search.txt");
pw.println(page.asXml());
pw.close();

结果页面没有在网络浏览器上显示的产品信息。我想AJAX呼叫还没有完成？（不确定。）

非常感谢任何帮助。谢谢！

Answer 1

您可以将GET请求用于此类任务。通过URL中的“pageCount”和“offset”参数控制页面，在检索页面后（下面的示例为一页执行此操作），您可以使用正则表达式或其他内容（JSON？）来提取标题。

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

        URL url = new URL(
                "http://tws.target.com/searchservice/item/search_results/v1/by_keyword?callback=getPlpResponse&navigation=true&category=55krw&searchTerm=&view_type=medium&sort_by=bestselling&faceted_value=&offset=60&pageCount=60&response_group=Items&isLeaf=true&parent_category_id=55kug&custom_price=false&min_price=from&max_price=to");
        WebRequest requestSettings = new WebRequest(url, HttpMethod.GET);

        requestSettings.setAdditionalHeader("Accept", "*/*");
        requestSettings.setAdditionalHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
        requestSettings.setAdditionalHeader("Referer", "http://www.target.com/c/xbox-one-games-video/-/N-55krw");
        requestSettings.setAdditionalHeader("Accept-Language", "en-US,en;q=0.8");
        requestSettings.setAdditionalHeader("Accept-Encoding", "gzip,deflate,sdch");
        requestSettings.setAdditionalHeader("Accept-Charset", "ISO-8859-1,utf-8;q=0.7,*;q=0.3");

        Page page = webClient.getPage(requestSettings);

        System.out.println(page.getWebResponse().getContentAsString());
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
}

HTMLUnit不使用Ajax / Javascript

1 个答案: