<s:form  name="targetForm" action="login">

            <s:textfield name="username" label="用户名"></s:textfield>
             <s:password name="password" label="密 码"></s:password>
  
            <s:radio label="用户类型" name ="type" list= "{'学生','管理员'}"/>
            <s:submit value="登陆" />
            
        </s:form>

<s:radio label="用户类型" name ="type" list= "{'学生','管理员','游客'}"/>

public class LoginAction extends BaseAction
{
    
    private String type;
    ……………………
       //省略无关变量的setter

    public String getType()
    {
        return type;
    }

    public void setType(String type)
    {
        this.type = type;
    }