Struts2中iterator标签遍历map总结

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转自http://penghuaiyi.iteye.com/blog/416567

1.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<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

 <%@ 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>