struts2的使用json问题

前台js请求及处理

<script type="text/javascript" src="<%=path%>/js/jquery.js"></script>
<script type="text/javascript">
$(function(){
         $.getJSON("login.action",{},function(result){
	   var r = eval(result);//将json字符串转为js对象
	   alert(r.name);
          });
});
</script>

struts.xml配置

<package name="default" namespace="/" extends="json-default">
     <action name="login" class="com.liyh.struts.web.HelloJsonAction" method="login">
        	<result type="json"></result>
        </action>
</package>

HelloJsonAction.java代码

public class HelloJsonAction extends ActionSupport
{
	private String name;//省略getter和setter

	@JSON
	public String login()
	{
		this.name = "dd";
		return SUCCESS;
	}
}

还有问题要注意：
  1、要导入struts2-json-plugin-2.2.1.jar和json-lib-2.1-jdk15.jar