一.Action中的代碼：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; //這里省略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","張三1","男",25));studentMap.put("student2",new Student(new Long(2),"20034140202","張三2","女",26));studentMap.put("student3",new Student(new Long(3),"20034140202","張三3","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","張三1","男",25));list1.add(new Student(new Long(2),"20034140202","張三2","男",25));list1.add(new Student(new Long(3),"20034140203","張三3","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.前端測試頁面：testMap.jsp
Java代碼
<%@ pagecontentType="text/html;charset=UTF-8"%> <%@ taglib prefix="s"uri="/struts-tags" %> <html><head><title>struts2中的map遍歷總結</title></head><body><b>1.map中的key為String，value為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為String，value為Student對象</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為String，value為String數組</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為String，value為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的類型為Map<Integer,List(Menu)>在前端遍歷，session.powerList存放的類型是：List（Menu）
<s:iterator value="map" id="mapList"> <s:if test="#mapList.key==0"><!-key為0的是父級菜單-> <s:iterator value="#mapList.value" id="map"> <li class="current"><!--遍歷父級菜單，取得其名字--> <b><s:property value="#map.menuName" /></b></a> <ul> <s:iterator value="#session.powerList" id="power"> <!--遍歷父級菜單下的所用子菜單--> <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>總結
以上就是本文關于Struts2 使用OGNL遍歷map方法詳解的全部內容，希望對大家有所幫助。
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