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"> <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>
总结
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