历史上关于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>