Question

我正在尝试从单击链接时使用__doPostBack函数的ASP页面中抓取数据。当我点击（）与HTMLUnit的链接时，它返回我开始的页面。我需要做什么才能完成回发并返回下一页？

代码：

import java.util.List;

import com.gargoylesoftware.htmlunit.ScriptResult;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.html.HtmlAnchor;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

public class ScrapperApp {

    private static void go() throws Exception {
        /* turn off annoying htmlunit warnings */
        java.util.logging.Logger.getLogger("com.gargoylesoftware").setLevel(java.util.logging.Level.OFF);

        HtmlPage nextPage;
        ScriptResult onClick; 

        String url = "http://media.ethics.ga.gov/search/Campaign/Campaign_Name.aspx?NameID=5751&FilerID=C2009000085&Type=candidate";

        final WebClient webclient = new WebClient(BrowserVersion.CHROME_16);
        final HtmlPage page = webclient.getPage(url);

        System.out.println("PULLING LINKS:");

        List<HtmlAnchor> articles = (List<HtmlAnchor>) page.getByXPath("//table[@id='ctl00_ContentPlaceHolder1_Name_Reports1_TabContainer1_TabPanel1_dgReports']/tbody/tr/td/a[@class='lblentrylink']");

        for(int x=0; x<articles.size(); x++) {
            System.out.println("Clicking "+x+": "+articles.get(x).asText()); 
            nextPage = articles.get(x).click();
            System.out.println(nextPage.getUrl());
        }
    }

    public static void main(String[] args) throws Exception {
        go();
        System.out.println("COMPLETE");
    }

}

输出：

PULLING LINKS:
Clicking 0: 
http://media.ethics.ga.gov/search/Campaign/Campaign_Name.aspx?NameID=5751&FilerID=C2009000085&Type=candidate
Clicking 1: 
http://media.ethics.ga.gov/search/Campaign/Campaign_Name.aspx?NameID=5751&FilerID=C2009000085&Type=candidate
...

Answer 1

您无法在这些链接上循环播放，就像您无法在浏览器的新窗口中打开它们一样。

你需要回到＆＃34; url＆＃34;每次点击的页面。

此外，需要对htmlunit进行一些调整以使其正常工作，这是我的工作代码。

    webClient = new WebClient(BrowserVersion.FIREFOX_24);
    webClient.getOptions().setTimeout(120000);
    webClient.waitForBackgroundJavaScript(60000);
    webClient.getOptions().setRedirectEnabled(true);
    webClient.getOptions().setJavaScriptEnabled(true);
    webClient.getOptions().setThrowExceptionOnFailingStatusCode(false);
    webClient.getOptions().setThrowExceptionOnScriptError(false);
    webClient.getOptions().setCssEnabled(false);
    webClient.getOptions().setUseInsecureSSL(true);
    webClient.setAjaxController(new NicelyResynchronizingAjaxController());

    String url = "http://media.ethics.ga.gov/search/Campaign/Campaign_Name.aspx?NameID=5751&FilerID=C2009000085&Type=candidate";

    HtmlPage rootPage = webClient.getPage(url);

    List<String> texts = new ArrayList<String>();
    for (HtmlAnchor a : (List<HtmlAnchor>) rootPage.getByXPath("//table[@id='ctl00_ContentPlaceHolder1_Name_Reports1_TabContainer1_TabPanel1_dgReports']/tbody/tr/td/a[@class='lblentrylink']")) {
        rootPage = webClient.getPage(url);
        HtmlPage page = a.click();
        String text = page.asText();

        if (!texts.contains(text)) {
            System.out.println(page.getUrl());
            texts.add(text);
        } else {
            System.out.println("already seen");
        }
    }
    for (String s : texts) {
        System.out.println(s);
    }

无法让HTMLUnit跟随使用__doPostBack（）函数的页面上的链接

1 个答案: