Struts2中iterator标签遍历map总结

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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>

博文来源：http://penghuaiyi.iteye.com/blog/416567