这篇文章给大家介绍怎么在Struts2中利用OGNL表达式对map进行遍历，内容非常详细，感兴趣的小伙伴们可以参考借鉴，希望对大家能有所帮助。
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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 map;
private Map studentMap;
private Map arrayMap;
private Map> listMap;
//这里省略get set方法
public String testMap(){
map=new HashMap();
map.put("1", "one");
map.put("2", "two");
studentMap=new HashMap();
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();
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>();
List list1=new ArrayList();
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 list2=new ArrayList();
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" %>
struts2中的map遍历总结
1.map中的key为String，value为String字符串
key:
value:
******************************************
| key=value |
ID |
num |
name |
sex |
age |
******************************************
2.map中的key为String，value为Student对象
|
|
|
|
|
|
|
| key=value |
ID |
num |
name |
sex |
age |
******************************************
3.map中的key为String，value为String数组
|
|
|
|
|
|
| class |
ID |
num |
name |
sex |
age |
******************************************
4.map中的key为String，value为list集合
|
|
|
|
|
|
|
附：map的类型为Map在前端遍历，session.powerList存放的类型是：List（Menu）
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