selenium 选择第二个元素

selenium用java选择第N个元素li

html代码：

<button title="请选择" data-id="used_company" type="button" class="btn btn-sm dropdown-toggle selectpicker btn-default" data-toggle="dropdown"><span class="filter-option pull-left">请选择</span>&nbsp;<span class="caret"></span></button>

<ul class="dropdown-menu inner selectpicker" role="menu">
   <li rel="0"><a tabindex="0" class="" style=""><span class="text">请选择</span><i class="glyphicon glyphicon-ok icon-ok check-mark"></i></a></li>
   <li rel="1"><a tabindex="0" class="" style=""><span class="text">名字</span><i class="glyphicon glyphicon-ok icon-ok check-mark"></i></a></li>
   ...
</ul>

driver.findElement(By.xpath("//button[@type='button']")).click();
driver.findElement(By.xpath("//ul[@class='dropdown-menu inner selectpicker']/li[2]/a/span[@class='text']")).click();