Struts2中iterator标签遍历map总结

1.MapAction.java 

Java代码 

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;    

        

    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;    

            

    }    

   

        

    public Map<String, String> getMap() {    

        return map;    

    }    

   

    public void setMap(Map<String, String> map) {    

        this.map = map;    

    }    

        

    public Map<String, Student> getStudentMap() {    

        return studentMap;    

    }    

   

    public void setStudentMap(Map<String, Student> studentMap) {    

        this.studentMap = studentMap;    

    }    

   

   

    public Map<String, String[]> getArrayMap() {    

        return arrayMap;    

    }    

   

   

    public void setArrayMap(Map<String, String[]> arrayMap) {    

        this.arrayMap = arrayMap;    

    }    

   

   

   

    public Map<String, List<Student>> getListMap() {    

        return listMap;    

    }    

   

   

   

    public void setListMap(Map<String, List<Student>> listMap) {    

        this.listMap = listMap;    

    }    

        

        

}  

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; 

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; 

  

} 

public Map<String, String> getMap() { 

  return map; 

} 

public void setMap(Map<String, String> map) { 

  this.map = map; 

} 

public Map<String, Student> getStudentMap() { 

  return studentMap; 

} 

public void setStudentMap(Map<String, Student> studentMap) { 

  this.studentMap = studentMap; 

} 

public Map<String, String[]> getArrayMap() { 

  return arrayMap; 

} 

public void setArrayMap(Map<String, String[]> arrayMap) { 

  this.arrayMap = arrayMap; 

} 

public Map<String, List<Student>> getListMap() { 

  return listMap; 

} 

public void setListMap(Map<String, List<Student>> listMap) { 

  this.listMap = listMap; 

} 

} 

2.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>    

   ******************************************<br>    

  </s:iterator>    

     

     

  <b>2.map中的value为Student对象</b>    

  <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>    

    <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>    

      

      

  <b>3.map中的value为String数组</b>    

  <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>    

    <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>    

  <b>4.map中的value为list集合</b>    

  <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>    

        

   <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>