Struts2 使用OGNL遍历map方法详解

Struts2 使用OGNL遍历map方法详解

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),"2003http://4140301","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" %>

1.map中的key为String，value为String字符串

key:

value:

******************************************

******************************************

2.map中的key为String，value为Student对象

******************************************

3.map中的key为String，value为String数组

******************************************

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）

<!-key为0的是父级菜单->

总结

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