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怎么在Struts2中利用OGNL表达式对map进行遍历

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:

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

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


 

   key=value
   ID
   num
   name
   sex
   age
 

 


 
 
 
 
 
 






 


 ******************************************
4.map中的key为String，value为list集合
 
 

  



 class
  ID
  num
  name
  sex
  age

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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