selenium2 提供了一种无ui模式的driver，即htmlunitdriver。特点运行比较快.其实htmlunitdriver 是对htmlunit 的封装，这样大家就可以使用自己习惯selenium2 语法来用它。

设置HtmlUnitDriver代理及处理用户验证问题

        Proxy proxy = new Proxy();        //设置代理服务器地址        proxy.setHttpProxy("代理服务器地址:端口号");        DesiredCapabilities capabilities = DesiredCapabilities.htmlUnit();        capabilities.setCapability(CapabilityType.PROXY, proxy);        WebDriver driver = new HtmlUnitDriver(capabilities)        {            @Override            protected WebClient modifyWebClient(WebClient client)            {                DefaultCredentialsProvider creds = new DefaultCredentialsProvider();                creds.addCredentials("用户名", "密码");                client.setCredentialsProvider(creds);                return client;            }        };        driver.get("http://www.baidu.com");        System.out.println("[" + driver.getTitle() + "]");