struts2 map list处理

http://younglibin.iteye.com/blog/473483


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;   
    }   
       
       
}  
Java代码 
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

Java代码 
<%@ 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>