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import java.util.ArrayList;<br /> import java.util.HashMap;<br /> import java.util.List;<br /> import java.util.Map; </p> <p>import com.opensymphony.xwork2.ActionSupport;<br /> import com.zx.demo.model.Product;<br /> import com.zx.demo.model.Student; </p> <p>public class MapAction extends ActionSupport<br /> { </p> <p> private Map<String,String> map; </p> <p> private Map<String,Student> studentMap; </p> <p> private Map<String,String[]> arrayMap; </p> <p> private Map<String,List<Student>> listMap; </p> <p> public String testMap()<br /> {<br /> map=new HashMap<String,String>();<br /> map.put(“1”, “one”);<br /> map.put(“2”, “two”); </p> <p> studentMap=new HashMap<String,Student>();<br /> studentMap.put(“student1″,new Student(new Long(1),”20034140201″,”张三1″,”男”,25));<br /> studentMap.put(“student2″,new Student(new Long(2),”20034140202″,”张三2″,”女”,26));<br /> studentMap.put(“student3″,new Student(new Long(3),”20034140202″,”张三3″,”男”,27)); </p> <p> arrayMap=new HashMap<String,String[]>();<br /> arrayMap.put(“arr1”, new String[]{“1″,”2003401″,”leejie”,”male”,”20″});<br /> arrayMap.put(“arr2”, new String[]{“2″,”2003402″,”huanglie”,”male”,”25″});<br /> arrayMap.put(“arr3”, new String[]{“3″,”2003403″,”lixiaoning”,”male”,”21″}); </p> <p> listMap=new HashMap<String,List<Student>>(); </p> <p> List<Student> list1=new ArrayList<Student>();<br /> list1.add(new Student(new Long(1),”20034140201″,”张三1″,”男”,25));<br /> list1.add(new Student(new Long(2),”20034140202″,”张三2″,”男”,25));<br /> list1.add(new Student(new Long(3),”20034140203″,”张三3″,”男”,25));<br /> listMap.put(“class1″, list1); </p> <p> List<Student> list2=new ArrayList<Student>();<br /> list2.add(new Student(new Long(1),”20034140301″,”李四1″,”男”,20));<br /> list2.add(new Student(new Long(2),”20034140302″,”李四2″,”男”,21));<br /> list2.add(new Student(new Long(3),”20034140303″,”李四3″,”男”,22));<br /> list2.add(new Student(new Long(4),”20034140304″,”李四4″,”男”,23));<br /> listMap.put(“class2”, list2); </p> <p> return SUCCESS; </p> <p> } </p> <p> public Map<String, String> getMap() {<br /> return map;<br /> } </p> <p> public void setMap(Map<String, String> map) {<br /> this.map = map;<br /> } </p> <p> public Map<String, Student> getStudentMap() {<br /> return studentMap;<br /> } </p> <p> public void setStudentMap(Map<String, Student> studentMap) {<br /> this.studentMap = studentMap;<br /> } </p> <p> public Map<String, String[]> getArrayMap() {<br /> return arrayMap;<br /> } </p> <p> public void setArrayMap(Map<String, String[]> arrayMap) {<br /> this.arrayMap = arrayMap;<br /> } </p> <p> public Map<String, List<Student>> getListMap() {<br /> return listMap;<br /> } </p> <p> public void setListMap(Map<String, List<Student>> listMap) {<br /> this.listMap = listMap;<br /> } </p> <p>}<br /> 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; } }</p> <p>2.testMap.jsp</p> <p>Java代码<br /> <%@ page contentType=”text/html;charset=UTF-8″ %><br /> <%@ taglib prefix=”s” uri=”/struts-tags” %><br /> <html><br /> <head><br /> <title>struts2中的map遍历总结</title><br /> </head><br /> <body><br /> <b>1.map中的value为String字符串</b><br><br /> <s:iterator value=”map” id=”column”><br /> <s:property value=”#column”/><br><br /> key: <s:property value=”key”/><br><br /> value:<s:property value=”value”/><br><br /> ******************************************<br><br /> </s:iterator> </p> <p> <b>2.map中的value为Student对象</b><br /> <table border=”1″ width=”50%” cellspacing=”0″ cellpadding=”0″><br /> <tr><br /> <td>key=value</td><br /> <td>ID</td><br /> <td>num</td><br /> <td>name</td><br /> <td>sex</td><br /> <td>age</td><br /> </tr><br /> <s:iterator value=”studentMap” id=”column”><br /> <tr><br /> <td><s:property value=”#column”/></td><br /> <td><s:property value=”value.id”/></td><br /> <td><s:property value=”value.num”/></td><br /> <td><s:property value=”value.name”/></td><br /> <td><s:property value=”value.sex”/></td><br /> <td><s:property value=”value.age”/></td><br /> </tr><br /> </s:iterator><br /> </table><br /> <p> </p> <p> <b>3.map中的value为String数组</b><br /> <table border=”1″ width=”50%” cellspacing=”0″ cellpadding=”0″><br /> <tr><br /> <td>key=value</td><br /> <td>ID</td><br /> <td>num</td><br /> <td>name</td><br /> <td>sex</td><br /> <td>age</td><br /> </tr><br /> <s:iterator value=”arrayMap” id=”column”><br /> <tr><br /> <td><s:property value=”#column”/></td><br /> <td><s:property value=”value[0]”/></td><br /> <td><s:property value=”value[1]”/></td><br /> <td><s:property value=”value[2]”/></td><br /> <td><s:property value=”value[3]”/></td><br /> <td><s:property value=”value[4]”/></td><br /> </tr><br /> </s:iterator><br /> </table><br /> <p><br /> <b>4.map中的value为list集合</b><br /> <table border=”1″ width=”50%” cellspacing=”0″ cellpadding=”0″><br /> <tr><br /> <td>class</td><br /> <td>ID</td><br /> <td>num</td><br /> <td>name</td><br /> <td>sex</td><br /> <td>age</td><br /> </tr> </p> <p> <s:iterator value=”listMap” id=”column”><br /> <s:set name=”total” value=”#column.value.size”/><br /> <s:iterator value=”#column.value” status=”s”><br /> <tr><br /> <s:if test=”#s.first”><td rowspan=”${total}”><s:property value=”#column.key”/></td></s:if><br /> <td><s:property value=”id”/></td><br /> <td><s:property value=”num”/></td><br /> <td><s:property value=”name”/></td><br /> <td><s:property value=”sex”/></td><br /> <td><s:property value=”age”/></td><br /> </tr><br /> </s:iterator><br /> </s:iterator><br /> </table> </p> <p></body><br /> </html><br />