listMap=new HashMap<String,List<Student>>();   

        List<Student> list1=new ArrayList<Student>();

        list1.add(new Student(new Long(1),"20034140201","张三1","男",25));

        list1.add(new Student(new Long(2),"20034140202","张三2","男",25));

        list1.add(new Student(new Long(3),"20034140203","张三3","男",25));

        listMap.put("class1", list1);   

        List<Student> list2=new ArrayList<Student>();

        list2.add(new Student(new Long(1),"20034140301","李四1","男",20));

        list2.add(new Student(new Long(2),"20034140302","李四2","男",21));

        list2.add(new Student(new Long(3),"20034140303","李四3","男",22));

        list2.add(new Student(new Long(4),"20034140304","李四4","男",23));

        listMap.put("class2", list2); 

 <s:iterator value="listMap" id="column">

     <s:set name="total" value="#column.value.size"/>

     <s:iterator value="#column.value" status="s">

      <tr>

        <s:if test="#s.first"><td rowspan="${total}"><s:property value="#column.key"/></td></s:if>

        <td><s:property value="id"/></td>

        <td><s:property value="num"/></td>

        <td><s:property value="name"/></td>

        <td><s:property value="sex"/></td>

        <td><s:property value="age"/></td>

      </tr>

     </s:iterator>

  </s:iterator>  

　　　　　　　　　<s:iterator value="recipientInfoList" var="recipientInfo">

                    <tr>

                        <s:iterator value="recipientInfo" id="ri" status="map">

                            <s:iterator value="#ri.value">

                                <td width="25px">

                                    <s:property value="cjf"/>

                                </td>

                                <td width="25px">

                                    <s:property value="unit"/>

                                </td>

                            </s:iterator>

                        </s:iterator>

                    </tr>

                </s:iterator> 

<action name="updateCampaign" class="campaignAction" method="updateCampaign">

    <result name="success" type="redirectAction">

        <param name="actionName">viewCampaignDetail</param>

        <param name="campaignId">${campaignId}</param>

    </result>

</action>  

publicclass A {

    private String param[];

    public String[] getParam() {

       returnparam;

    }

    publicvoid setParam(String[] param) {

       this.param = param;

    }

    publicvoid execute(){

       for(int i=0;i<this.param.length;i++){

           System.out.println(this.param[i]);

       }

    }

}