struts2 标签展示 map

在jsp页面用iterator 迭代时，如果 list中放的是map对象！而不是Object 用到的如下！

（平时用的list  中存放的都是Object对象）

 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;
    }


}

 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>