《深入浅出struts2》--第七章，类型转换-支持与Map一起使用

来源：互联网发布：情定三生知夏的床戏编辑：程序博客网时间：2024/06/17 05:49

struts2 遍历Map的多种方法

主要针对以下几种情况的Map:

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"; }}

<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>

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