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Struts2使用OGNL遍历各种map总结

2015-10-29 09:52 573 查看

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一.Action中的代码：MapAction.java

package com.zx.demo.action;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import com.opensymphony.xwork2.ActionSupport;

import com.zx.demo.model.Product;

import com.zx.demo.model.Student;

public class MapAction extends ActionSupport

{
  private Map<String,String>  map;

  private Map<String,Student>  studentMap;

  private Map<String,String[]>  arrayMap;

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



//这里省略get  set方法

public String testMap(){


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

map.put("1", "one");

map.put("2", "two");


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));


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"});


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);

return SUCCESS;

   }

}
二.前端测试页面：testMap.jsp

Java代码

<%@ page

contentType="text/html;charset=UTF-8"

%>

<%@ taglib prefix="s"

uri="/struts-tags" %>

  <html>

<head>

<title>struts2中的map遍历总结</title>

</head>

<body>
<b>1.map中的key为String，value为String字符串</b><br>

      <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>

******************************************<br>

  <table border="1" width="50%"  cellspacing="0" cellpadding="0">

<tr>

  <td>key=value</td>

  <td>ID</td>

  <td>num</td>

  <td>name</td>

  <td>sex</td>

  <td>age</td>

</tr>

******************************************<br>
<b>2.map中的key为String，value为Student对象</b>

<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>

</table>

<p>

<table border="1" width="50%"  cellspacing="0" cellpadding="0">

  <
acf7
tr>

     <td>key=value</td>

     <td>ID</td>

     <td>num</td>

     <td>name</td>

     <td>sex</td>

     <td>age</td>

  </tr>

******************************************<br>
<b>3.map中的key为String，value为String数组</b>

<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>

</table>

<p>

<table border="1" width="50%"  cellspacing="0" cellpadding="0">

<tr>

  <td>class</td>

   <td>ID</td>

   <td>num</td>

   <td>name</td>

   <td>sex</td>

   <td>age</td>

</tr>

******************************************<br>
<b>4.map中的key为String，value为list集合</b>
<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>

  </table>

</body>

</html>

附：map的类型为Map<Integer,List(Menu)>在前端遍历，session.powerList存放的类型是：List（Menu）

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

      <s:if test="#mapList.key==0"><!-key为0的是父级菜单->

      <s:iterator value="#mapList.value" id="map">

       <li class="current">

      <b><s:property value="#map.menuName" /></b></a>

         <ul>

         <s:iterator value="#session.powerList" id="power">

      

            <s:if test="#power.menuFatherId==#map.menuId">

        <li><a onClick="funFrame('admin/<s:property value="#power.menuUrl" />')"  ><s:property value="#power.menuName" /></a>

        </li>

             </s:if>

         </s:iterator>

         </ul>

         </li>

         </s:iterator>

          </s:if>

          </s:iterator>

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Struts2使用OGNL遍历各种map总结

ognl遍历map集合

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