Struts2 使用OGNL遍历map方法详解

 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; } }

 <%@ 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:
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2.map中的key为String，value为Student对象 
 
 
key=value
ID
num
name
sex
age
 
 
 
 
 
 
 
 
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3.map中的key为String，value为String数组 
 
 
key=value
ID
num
name
sex
age
 
 
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4.map中的key为String，value为list集合   
 
 
class
ID
num
name
sex
age
 
 
 
 
 

   
   
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