HTMLUnit getPage NoClassDefFoundError

Question

我在使用以下源代码时遇到了问题：

import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.NicelyResynchronizingAjaxController;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.WebRequest;
import com.gargoylesoftware.htmlunit.html.HtmlPage;

import java.net.URL;

/**
 * Created by Boris on 14-1-2.
 */
public class Parser {

    public static void main(String[] args) throws Exception {

        WebClient webClient = new WebClient(BrowserVersion.FIREFOX_17);
        webClient.setAjaxController(new NicelyResynchronizingAjaxController());

        WebRequest request = new WebRequest(new URL("http://oddsportal.com"));
        HtmlPage page = webClient.getPage(request);

        int i = webClient.waitForBackgroundJavaScript(1000);

        while (i > 0)
        {
            i = webClient.waitForBackgroundJavaScript(1000);

            if (i == 0)
            {
                break;
            }
            synchronized (page)
            {
                System.out.println("wait");
                page.wait(500);
            }
        }

        webClient.getAjaxController().processSynchron(page, request, false);

        System.out.println(page.asXml());

    }
}

这是错误信息：

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/http/pool/ConnPoolControl
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:792)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:449)
    at java.net.URLClassLoader.access$100(URLClassLoader.java:71)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at com.gargoylesoftware.htmlunit.HttpWebConnection.createHttpClient(HttpWebConnection.java:557)
    at com.gargoylesoftware.htmlunit.HttpWebConnection.getHttpClient(HttpWebConnection.java:518)
    at com.gargoylesoftware.htmlunit.HttpWebConnection.getResponse(HttpWebConnection.java:155)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseFromWebConnection(WebClient.java:1486)
    at com.gargoylesoftware.htmlunit.WebClient.loadWebResponse(WebClient.java:1403)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:305)
    at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:390)
    at DIIParser.Parser.main(Parser.java:22)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.ClassNotFoundException: org.apache.http.pool.ConnPoolControl
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    ... 25 more

我阅读了很多关于该主题的内容，包括 WebClient 的浏览器版本，切换到 org.apache.httpcomponents 的旧版本 4.2，尝试转换 HtmlPage，如此处另一个主题中所述，但没有任何帮助。我想要的只是加载一个特定的页面并等到 javascript 被执行，然后用 jsoup 解析它。提前感谢您的帮助！

问候， 鲍里斯

Answer 1

虽然你还没有解释到目前为止你做了什么来得到这个错误，但我猜你还没有导入适当的库。确保您导入了 HTMLUnit 发行版中的所有库。

您可以在以下问题中查看如何在 Eclipse 中执行此操作，也许它会有所帮助： How to setup HtmlUnit in an Eclipse project?

顺便说一句，没有必要切换到任何旧版本。只需导入库即可。