三、HtmlUnitDriver
优点：HtmlUnitDriver不会实际打开浏览器，运行速度很快。对于用FireFox等浏览器来做测试的自动化测试用例，运行速度通常很慢，HtmlUnitDriver无疑是可以很好地解决这个问题。
缺点：它对JavaScript的支持不够好，当页面上有复杂JavaScript时，经常会捕获不到页面元素。
1.使用HtmlUnitDriver访问百度，并返回页面标题信息

package selenium.test.googleSearch;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;

public class BaiduHtmlUnitDriver {

	/**
	 * @param args
	 */
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		WebDriver driver=new HtmlUnitDriver();
		//打开百度首页
		driver.get("http://www.baidu.com/");
		//打印页面标题
		System.out.println("页面标题："+driver.getTitle());
		//根据id获取页面元素输入框
		WebElement search=driver.findElement(By.id("kw"));
		//在id=“kw”的输入框输入“selenium”
		search.sendKeys("selenium");
		//根据id获取提交按钮
		WebElement submit=driver.findElement(By.id("su"));
		//点击按钮查询
		submit.click();
		//打印当前页面标题
	    System.out.println("页面标题："+driver.getTitle());
	    //返回当前页面的url
	    System.out.println("页面url："+driver.getCurrentUrl());
	    //返回当前的浏览器的窗口句柄
	    System.out.println("窗口句柄："+driver.getWindowHandle());

	}

}

2.selenium官网wiki中关于HtmlUnitDriver的例子

package org.openqa.selenium.example;

import org.openqa.selenium.By;
import org.openqa.selenium.WebDriver;
import org.openqa.selenium.WebElement;
import org.openqa.selenium.htmlunit.HtmlUnitDriver;

public class Example  {
    public static void main(String[] args) {
        // Create a new instance of the html unit driver
        // Notice that the remainder of the code relies on the interface, 
        // not the implementation.
        WebDriver driver = new HtmlUnitDriver();

        // And now use this to visit Google
        driver.get("http://www.google.com");

        // Find the text input element by its name
        WebElement element = driver.findElement(By.name("q"));

        // Enter something to search for
        element.sendKeys("Cheese!");

        // Now submit the form. WebDriver will find the form for us from the element
        element.submit();

        // Check the title of the page
        System.out.println("Page title is: " + driver.getTitle());
    }
}