Struts2 使用OGNL遍历map方法详解

2024-07-13 10:12:21

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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

<%@ pagecontentType="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"> <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"><!--遍历父级菜单，取得其名字-->     <b><s:property value="#map.menuName" /></b></a>     <ul>     <s:iterator value="#session.powerList" id="power">   <!--遍历父级菜单下的所用子菜单-->      <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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