struts2 遍历Map的N中方法介绍。
来源 http://hi.baidu.com/iduany/item/19f9f622603ba8172a0f1c72 struts2 遍历Map的N中方法
主要针对以下几种情况的Map: private Map<String, String> strMap = new HashMap<String, String>(); private Map<String, Person> perMap = new HashMap<String, Person>();
private Map<String, String[]> strArryMap = new HashMap<String, String[]>(); private Map<String, List<Person>> perLstMap = new HashMap<String, List<Person>>();
下面给出一个示例 1).ExpressMapAction.java package com.expre.struts2.action;
import java.util.ArrayList; import java.util.HashMap; import java.util.List; import java.util.Map;
import com.expre.struts2.bean.Person; import com.expre.struts2.bean.Phone; import com.opensymphony.xwork2.ActionSupport;
public class ExpressMapAction extends ActionSupport { private static final long serialVersionUID = -4251480679223607716L;
private Map<String, String> strMap = new HashMap<String, String>();
private Map<String, Person> perMap = new HashMap<String, Person>();
private Map<String, String[]> strArryMap = new HashMap<String, String[]>();
private Map<String, List<Person>> perLstMap = new HashMap<String, List<Person>>();
//get&set方法,这里都省略了 ……………….
@Override public String execute() throws Exception {
// 值为字符串 strMap.put(“first”, “zxx”); strMap.put(“second”, “lsx”); strMap.put(“third”, “wxh”);
// 值为javabean对象 Person person = new Person(“001″, “zxx”, 22); person.setPhone(new Phone(“apple”, 18957157189L));
perMap.put(“one”, person);
person = new Person(“002″, “lsx”, 25); person.setPhone(new Phone(“HTC”, 18957157187L)); perMap.put(“two”, person);
// 数组处理 strArryMap.put(“arr1″, new String[] { “1″, “310000″, “hz” }); strArryMap.put(“arr2″, new String[] { “2″, “310001″, “xh” }); strArryMap.put(“arr3″, new String[] { “3″, “310002″, “sc” });
//list对象处理 List<Person> list=new ArrayList<Person>();
list.add(new Person(“001″, “zxx”, 22)); list.add(new Person(“002″, “lsx”, 25)); perLstMap.put(“one”, list);
list=new ArrayList<Person>();
list.add(new Person(“003″, “wlx”, 26)); list.add(new Person(“004″, “hzx”, 28)); perLstMap.put(“two”, list);
return “result”; } }
2).struts.xml <!DOCTYPE struts PUBLIC “-//Apache Software Foundation//DTD Struts Configuration 2.0//EN” “http://struts.apache.org/dtds/struts-2.0.dtd“> <struts> <package name=”express” extends=”struts-default” namespace=”/exp”> <action name=”expressMap” > <result name=”result”>/jsp/strMap.jsp</result> </action> </package> </struts>
3.web.xml <?xml version=”1.0″ encoding=”UTF-8″?> <web-app version=”2.4″ xmlns=”http://java.sun.com/xml/ns/j2ee” xmlns:xsi=”http://www.w3.org/2001/XMLSchema-instance” xsi:schemaLocation=”http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd“> <filter> <filter-name>struts2</filter-name> <filter-class>org.apache.struts2.dispatcher.FilterDispatcher</filter-class> </filter> <filter-mapping> <filter-name>struts2</filter-name> <url-pattern>/*</url-pattern> </filter-mapping>
<welcome-file-list> <welcome-file>/first.jsp</welcome-file> </welcome-file-list> </web-app>
4).strMap.jsp <%@ page language=”java” pageEncoding=”utf-8″%> <!DOCTYPE HTML PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”> <%@ taglib uri=”/struts-tags” prefix=”s”%> <html> <body> <ul> <li>访问Map:<s:property value=”strMap”/></li> <li>访问Map中某个元素: <s:property value=”strMap.first”/> | <s:property value=”strMap['second']“/> | <s:property value=”strMap[\'third\']“/> </li> <li>访问Map中所有的key:<s:property value=”strMap.keys”/></li> <li>访问Map中所有的value:<s:property value=”strMap.values”/></li> <li>访问容器的大小： <s:property value=”strMap.size()”/> | <s:property value=”strMap.size”/>//这是map特别的地方 </li>
<li>迭代循环取值,最简单 <s:iterator value=”strMap” id=”entry”> <s:property value=”#entry”/>{ key: <s:property value=”key”/> value:<s:property value=”value”/>}| </s:iterator> </li>
<li>迭代循环取值 <s:iterator value=”strMap.keySet()” id=”key”> <s:property value=”key”/>或<s:property value=”#key”/>: <s:if test=”strMap[#key]!=null”> <s:property value=”strMap.get(#key)”/> | </s:if> </s:iterator> </li>
<li>迭代循环取数组值 <s:iterator value=”strMap” id=”entry”> <s:property value=”#entry”/>{ <s:property value=”value[0]“/> <s:property value=”value[1]“/> | <s:property value=”value[2]“/> } </s:iterator> </li>
<li>迭代循环取对象值,最直接: <ul> <s:iterator value=”perMap” id=”entry”> <li> <s:property value=”#entry”/> { ID：<s:property value=”value.ID”/>
Name：<s:property value=”value.name”/> Age：<s:property value=”value.age”/> }| </li> </s:iterator> </ul> </li>
<li>迭代循环取对象的属性值 <s:iterator value=”perMap.keySet()” id=”key”> <s:property value=”#key”/>: <s:iterator value=”perMap.get(#key)”> <s:property value=”ID”/> <s:property value=”name”/> <s:property value=”phone.name”/> </s:iterator>| </s:iterator> </li>
<li>稍复杂的迭代 <s:iterator value=”perLstMap” id=”entry”> <s:set name=”total” value=”#entry.value.size”/> <s:iterator value=”#entry.value” status=”s”> <s:if test=”#s.first”> <s:property value=”#entry.key”/>:共${total}条 </s:if> { <s:property value=”ID”/> | <s:property value=”name”/> | <s:property value=”age”/> }; </s:iterator> </s:iterator>
</li> </ul> </body> </html>
5).通过url：http://localhost:8080/struts2Jsp/exp/expressMap.action访问就会看到输出！
别的不多说，strMap.jsp已经把使用方法都写出来了！
http://www.blogjava.net/tinguo002/archive/2012/07/26/384097.html