最近要弄一个爬虫程序，想着先来个简单的模拟登陆， 在权衡JxBrowser和HtmlUnit 两种技术，  JxBowser有界面呈现效果，但是对于某些js跳转之后的效果获取比较繁琐。

随后考虑用HtmlUnit， 想着借用咱们CSND的登陆练练手。谁知道CSDN的登陆，js加载时间超长，不设置长一点的加载时间，按钮提交根本没效果，js没生效。 具体看代码注释吧。 奉劝做爬虫的同志们，千万别用CSDN登陆练手，坑死我了。。。

maven配置如下：

	<dependencies><!-- https://mvnrepository.com/artifact/net.sourceforge.htmlunit/htmlunit --><dependency><groupId>net.sourceforge.htmlunit</groupId><artifactId>htmlunit</artifactId><version>2.18</version></dependency><!-- https://mvnrepository.com/artifact/org.jsoup/jsoup --><dependency><groupId>org.jsoup</groupId><artifactId>jsoup</artifactId><version>1.9.2</version></dependency></dependencies>

代码如下：

/** Copyright (c) 2017 Create By Shijing All Rights Reserved.*/
package com.test;import java.io.IOException;
import java.net.MalformedURLException;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;import com.gargoylesoftware.htmlunit.BrowserVersion;
import com.gargoylesoftware.htmlunit.FailingHttpStatusCodeException;
import com.gargoylesoftware.htmlunit.NicelyResynchronizingAjaxController;
import com.gargoylesoftware.htmlunit.SilentCssErrorHandler;
import com.gargoylesoftware.htmlunit.WebClient;
import com.gargoylesoftware.htmlunit.html.HtmlButtonInput;
import com.gargoylesoftware.htmlunit.html.HtmlForm;
import com.gargoylesoftware.htmlunit.html.HtmlPage;
import com.gargoylesoftware.htmlunit.html.HtmlPasswordInput;
import com.gargoylesoftware.htmlunit.html.HtmlTextInput;
import com.gargoylesoftware.htmlunit.util.Cookie;public class SimulateLogin
{//访问的目标网址（CSDN）private static String TARGET_URL = "https://passport.csdn.net/account/login?from=http://www.csdn.net";public static void main(String[] args) throws FailingHttpStatusCodeException, MalformedURLException, IOException{// 模拟一个浏览器WebClient webClient = new WebClient(BrowserVersion.CHROME);// 设置webClient的相关参数webClient.setCssErrorHandler(new SilentCssErrorHandler());  //设置ajaxwebClient.setAjaxController(new NicelyResynchronizingAjaxController());//设置支持jswebClient.getOptions().setJavaScriptEnabled(true);//CSS渲染禁止webClient.getOptions().setCssEnabled(false);//超时时间webClient.getOptions().setTimeout(50000);//设置js抛出异常:falsewebClient.getOptions().setThrowExceptionOnScriptError(false);//允许重定向webClient.getOptions().setRedirectEnabled(true);  //允许cookiewebClient.getCookieManager().setCookiesEnabled(true);  // 模拟浏览器打开一个目标网址HtmlPage page = webClient.getPage(TARGET_URL);/**等待js加载完全，CSDN这点 特别坑，js加载时间超长！！！！！！！ 后人切记不要用CSDN模拟登陆！！！！！！！**/webClient.waitForBackgroundJavaScript(10000*3);// 根据form的名字获取页面表单，也可以通过索引来获取：page.getForms().get(0)     HtmlForm form = (HtmlForm) page.getElementById("fm1");         HtmlTextInput username = (HtmlTextInput) form.getInputByName("username");  HtmlPasswordInput password = (HtmlPasswordInput) form.getInputByName("password");  username.setValueAttribute("********");  //用户名password.setValueAttribute("********");  //密码HtmlButtonInput button  = (HtmlButtonInput) page.getByXPath("//input[contains(@class, 'logging')]").get(0);
//        ScriptResult result = page.executeJavaScript("javascript:document.getElementsByClassName('logging')[0].click()");
//        HtmlPage retPage = (HtmlPage) result.getNewPage();HtmlPage retPage = button.click();// 等待JS驱动dom完成获得还原后的网页  webClient.waitForBackgroundJavaScript(1000);  //输出跳转网页的地址System.out.println(retPage.getUrl().toString());   //输出跳转网页的内容System.out.println(retPage.asXml());//获取cookie  Set<Cookie> cookies = webClient.getCookieManager().getCookies();Map<String, String> responseCookies = new HashMap<String, String>();  for (Cookie c : cookies) {  responseCookies.put(c.getName(), c.getValue());  System.out.print(c.getName()+":"+c.getValue());  }  webClient.close();System.out.println("Success!");}
}

另外，CSDN的JS总是莫名其妙的报一堆错，如果不想看，想忽略的话，在创建WebClient前加上如下代码：

        //设置日志级别，原页面js异常不打印LogFactory.getFactory().setAttribute("org.apache.commons.logging.Log",    "org.apache.commons.logging.impl.NoOpLog");  java.util.logging.Logger.getLogger("com.gargoylesoftware.htmlunit")  .setLevel(Level.OFF);  java.util.logging.Logger.getLogger("org.apache.commons.httpclient")  .setLevel(Level.OFF);