struts2 遍历Map最全的总结 .

Struts2中iterator标签遍历map总结

 

 

针对以下几种情况的Map:

 

 

    private Map<String,String> map;   

      

    private Map<String,Student> studentMap;   

    

   private Map<String,String[]> arrayMap;   

    

  private Map<String,List<Student>> listMap;

 

 

---

 

      map=new HashMap<String,String>();       

      map.put("1", "one");   

      map.put("2", "two");   

 

用法：

 

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

   <s:property value="#column"/><br>   

   key: <s:property value="key"/><br>   

  value:<s:property value="value"/><br>  

  </s:iterator>   

 

 

---

 

 

    studentMap=new HashMap<String,Student>();   

        studentMap.put("student1",new Student(new Long(1),"20034140201","张三1","男",25));   

      studentMap.put("student2",new Student(new Long(2),"20034140202","张三2","女",26));   

        studentMap.put("student3",new Student(new Long(3),"20034140202","张三3","男",27));    

 

用法：

 

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

    <tr>   

     <td><s:property value="#column"/></td>   

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

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

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

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

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

    </tr>   

   </s:iterator> 

 

 

 

---

 

 

        arrayMap=new HashMap<String,String[]>();   

        arrayMap.put("arr1", new String[]{"1","2003401","leejie","male","20"});   

        arrayMap.put("arr2", new String[]{"2","2003402","huanglie","male","25"});   

        arrayMap.put("arr3", new String[]{"3","2003403","lixiaoning","male","21"});   

           

 

用法

 

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

    <tr>   

     <td><s:property value="#column"/></td>   

     <td><s:property value="value[0]"/></td>   

     <td><s:property value="value[1]"/></td>   

     <td><s:property value="value[2]"/></td>   

     <td><s:property value="value[3]"/></td>   

     <td><s:property value="value[4]"/></td>   

    </tr>   

    </s:iterator>  

 

 

 

---

 

 

           

        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);   

 

 

用法：

 

 

   <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>