程序喵使用struts2中，使用Iterator标签可以遍历任何可以遍历的类型，这里就不多做实例了，简单的写几个常用的，初次使用常出错的
一共写了两个实例；Map和数组
一： 先看map遍历
（1） MapAction.java
package cn.intertor.demo;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import cn.entity.Student;
import com.opensymphony.xwork2.ActionSupport;
@SuppressWarnings("serial")
public class MapAction extends ActionSupport {
private Map<String, String> map; // string集合
private Map<String, Student> studentMap; // Student对象集合
private Map<String, String[]> arrayMap; // 数组集合
private Map<String, List<Student>> listMap; // list集合
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", "小奎", "男", 19));
studentMap.put("student2", new Student(new Long(2), "20034140202", "小灿", "女", 19));
studentMap.put("student3", new Student(new Long(3), "20034140203", "小君", "男", 18));
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", "小奎", "男", 19));
list1.add(new Student(new Long(2), "20034140202", "小灿", "女", 19));
list1.add(new Student(new Long(3), "20034140203", "小君", "男", 18));
listMap.put("class1", list1);
List<Student> list2 = new ArrayList<Student>();
list2.add(new Student(new Long(1), "20034150201", "李四1", "男", 20));
list2.add(new Student(new Long(2), "20034150201", "李四2", "男", 21));
list2.add(new Student(new Long(3), "20034150201", "李四3", "男", 22));
list2.add(new Student(new Long(4), "20034150201", "李四4", "男", 23));
listMap.put("class2", list2);
return SUCCESS;
}
/* 省略get和set方法 */
}（2）Student实体类
package cn.entity;
public class Student {
private long id;
private String num;
private String name;
private int age;
private String sex;
public Student() {
}
public Student(Long id, String num, String name, String sex, int age) {
this.id = id;
this.num = num;
this.name = name;
this.sex = sex;
this.age = age;
}
/* 省略get和set方法 */
}（3）Struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.1//EN" "http://struts.apache.org/dtds/struts-2.1.dtd"> <struts> <package name="default" extends="struts-default" namespace="/"> <action name="map" class="cn.intertor.demo.MapAction" method="testMap"> <result>testMap.jsp</result> </action> </package> </struts>
(4) testMap.jsp
<%@ 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" var="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" var="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" var="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" var="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>结果:
第二个例子，定义一个jsp页面
<%@ page pageEncoding=“GBK " language="java" import="java.util.*"%>
<%@ taglib prefix="s" uri="/struts-tags"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<title>遍历小例子</title>
</head>
<body>
(1)遍历int数组******************************************
<br />
<s:iterator value="{1,2,3,4,5,6}">
<s:property />
<br />
</s:iterator>
(2)遍历String数组**************************************
<br />
<s:iterator value="{'aaa','bbb','ccc','ddd','eee','fff','ggg'}" var="s" status="status">
转换大写：<s:property value="#s.toUpperCase()" />
索引:<s:property value="#status.count" />
是否奇数：<s:property value="#status.even" />
是否偶数：<s:property value="#status.odd" />
是否第一个元素:<s:property value="#status.first" />
是否最后一个元素<s:property value="#status.last" />
<br />
</s:iterator>
(3)变量Map集合_(1):*****************************************
<br />
<s:iterator value="#{1:'小奎',2:'小灿',3:'嘿嘿'}">
<s:property value="key" /> | <s:property value="value" />
<br />
</s:iterator>
(4)变量Map集合_(2):*****************************************
<br />
<s:iterator value="#{1:'小奎',2:'小灿',3:'嘿嘿'}" var="m">
<s:property value="#m.key" /> | <s:property value="#m.value" />
<br />
</s:iterator>
</body>
</html> 结果：
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