如何使用struts的select标签？

页面的标签

<html:select property='voltage'>

<html:options collection="projectItems" labelProperty="label" property="value"/>

</html:select>

后台的型成，LabelValueBean是struts的内部标签

Vector projectItems=new Vector(4);

projectItems.add(0,new LabelValueBean("项目部1","1"));

projectItems.add(1,new LabelValueBean("项目部2","2"));

projectItems.add(2,new LabelValueBean("项目部3","3"));

projectItems.add(3,new LabelValueBean("项目部4","4"));

request.setAttribute("projectItems",projectItems);//projectItmes得和collection=""的值必须相同

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