HtmlUnitDriver 网页内容动态抓取

#抓取内容
WebDriver driver = new HtmlUnitDriver(false);
driver.get(url);
String html = driver.getPageSource();

#如何想等待一会元素渲染完毕
driver.manage().timeouts().implicitlyWait(2, TimeUnit.SECONDS);

#进行百度搜索
public static void doSearch(String keyword) {
  final String url = "http://www.baidu.com";
  WebDriver driver = new HtmlUnitDriver(false);
  driver.get(url);
  driver.findElement(By.id("kw")).sendKeys(keyword);
  Actions action = new Actions(driver);
  action.sendKeys(Keys.ENTER).perform();
  System.out.println(driver.getPageSource());
}