zoukankan html css js c++ java

<s:iterator>各种遍历用法

struts2<S:iterator>遍历map小结

1.MapAction.java 

import java.util.ArrayList;   
import java.util.HashMap;   
import java.util.List;   
import java.util.Map;  

import com.opensymphony.xwork2.ActionSupport 
import com.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>   
     
   <1.<s:iterator value="listHashMap" id="listid">   
   <s:iterator value="#listid.value" id="listidsub">   
       <tr>   
            <td><s:property value="key"/></td>   
            <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>

-------------------------------------------------------------------------------------------------------------------------------------------------

4、普通属性
public String execute(){
 username = "zhangsan";
 password = "123";
}
<s:property value="username"/> 
 <s:property value="password"/> 

5、自定义对象
public String execute(){
userInfo = new UserInfo();
userInfo.setUsername("hhh");
userInfo.setPassword("111");
}
<s:property value="userInfo.username"/> 
 <s:property value="userInfo.password"/> 

6、List（普通属性）
public String execute(){
list = new ArrayList<String>();
list.add("aaa");
list.add("bbb");
list.add("ccc");
}
<s:iterator value="list" var="var">
 <s:property value="var"/> 
 </s:iterator>
 或者：
 <s:iterator value="list">
 <s:property/> 
 </s:iterator>

6、List（自定义对象属性）
public String execute(){
list = new ArrayList<UserInfo>();
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u1");
userInfo.setPassword("p1");
userInfo.setRoleInfo(new RoleInfo("r1"));
list.add(userInfo);
userInfo = new UserInfo();
userInfo.setUsername("u2");
userInfo.setPassword("p2");
userInfo.setRoleInfo(new RoleInfo("r2"));
list.add(userInfo);
}
<s:iterator value="list" var="var">
 <s:property value="#var.username"/>
 <s:property value="#var.password"/>
 <s:property value="#var.roleInfo.rolename"/> 
</s:iterator>
或者：
<s:iterator value="list">
 <s:property value="username"/>
 <s:property value="password"/>
 <s:property value="roleInfo.rolename"/> 
</s:iterator>

7、数组（普通属性）
public String execute(){
strs = new String[2];
strs[0] = "as";
strs[1] = "asd";
}
<s:iterator value="strs">
 <s:property/> 
 </s:iterator>
或者：
<s:iterator value="strs" var="var">
 <s:property value="var"/> 
 </s:iterator>

8、数组（自定义对象属性）
public String execute(){
strs = new UserInfo[2];
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u11");
userInfo.setPassword("11");
strs[0] = userInfo;
userInfo = new UserInfo();
userInfo.setUsername("u22");
userInfo.setPassword("22");
strs[1] = userInfo;
}
<s:iterator value="strs">
 <s:property value="username"/>
 <s:property value="password"/> 
 </s:iterator>
或者：
<s:iterator value="strs" var="var">
 <s:property value="#var.username"/>
 <s:property value="#var.password"/> 
</s:iterator>

8、数组（自定义对象属性）
public String execute(){
strs = new UserInfo[2];
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u11");
userInfo.setPassword("11");
userInfo.setRoleInfo(new RoleInfo("r11"));
strs[0] = userInfo;
userInfo = new UserInfo();
userInfo.setUsername("u22");
userInfo.setPassword("22");
userInfo.setRoleInfo(new RoleInfo("r22"));
strs[1] = userInfo;
}
<s:iterator value="strs" var="var">
 <s:property value="#var.username"/>
 <s:property value="#var.password"/>
 <s:property value="#var.roleInfo.rolename"/> 
</s:iterator>
或者：
<s:iterator value="strs">
 <s:property value="username"/>
 <s:property value="password"/>
 <s:property value="roleInfo.rolename"/> 
</s:iterator>

8、Map（普通属性）
public String execute(){
map = new HashMap<String,String>();
map.put("k1", "v1");
map.put("k2", "v2");
}
<s:iterator value="map" var="var">
 <s:property value="#var.key"/>
 <s:property value="#var.value"/> 
</s:iterator>
或者：
<s:iterator value="map">
 <s:property value="key"/>
 <s:property value="value"/> 
</s:iterator>

8、Map（自定义对象属性）
public String execute(){
map = new HashMap<String,UserInfo>();
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u1");
userInfo.setPassword("p1");
userInfo.setRoleInfo(new RoleInfo("r1"));
map.put("k1", userInfo);
userInfo = new UserInfo();
userInfo.setUsername("u2");
userInfo.setPassword("p2");
userInfo.setRoleInfo(new RoleInfo("r2"));
map.put("k2", userInfo);
}
<s:iterator value="map" var="var">
 <s:property value="#var.key"/>
 <s:property value="#var.value.username"/>
 <s:property value="#var.value.password"/>
 <s:property value="#var.value.roleInfo.rolename"/> 
</s:iterator>
或者
<s:iterator value="map">
 <s:property value="key"/>
 <s:property value="value.username"/>
 <s:property value="value.password"/>
 <s:property value="value.roleInfo.rolename"/> 
</s:iterator>

8、Map嵌套Map（自定义对象属性）
public String execute(){
map = new TreeMap<String,Map<String,UserInfo>>();
Map<String,UserInfo> innerMap = new TreeMap<String,UserInfo>();
UserInfo userInfo = new UserInfo();
userInfo.setUsername("u1");
userInfo.setPassword("p1");
userInfo.setRoleInfo(new RoleInfo("r1"));
userInfo = new UserInfo();
userInfo.setUsername("u11");
userInfo.setPassword("p11");
userInfo.setRoleInfo(new RoleInfo("r11"));
innerMap.put("k1", userInfo);
innerMap.put("k11", userInfo);
map.put("key1", innerMap);
//////////////////////////
innerMap = new TreeMap<String,UserInfo>();
userInfo = new UserInfo();
userInfo.setUsername("u2");
userInfo.setPassword("p2");
userInfo.setRoleInfo(new RoleInfo("r2"));
userInfo = new UserInfo();
userInfo.setUsername("u22");
userInfo.setPassword("p22");
userInfo.setRoleInfo(new RoleInfo("r22"));
innerMap.put("k2", userInfo);
innerMap.put("k22", userInfo);
map.put("key2", innerMap);
}
<s:iterator value="map" var="var">
 <s:iterator value="value">
 <s:property value="#var.key"/>
 <s:property value="key"/>
 <s:property value="value.username"/>
 <s:property value="value.password"/>
 <s:property value="value.roleInfo.rolename"/> 
 </s:iterator>
</s:iterator>

查看全文

相关阅读:
java算法：树遍历
 java算法：图遍历(深度优先和广度优先)
Google禁止继续研发开源的"盖亚计划"
Vc编程调试入门
 访著名Linux内核程序员大鹰
 访著名Linux内核程序员大鹰
 百度玩"精准搜索" 个人隐私保护问题值得商榷
 Google禁止继续研发开源的"盖亚计划"
加密CMD使电脑溢出也拿不到CMD权限
 百度玩"精准搜索" 个人隐私保护问题值得商榷

原文地址：https://www.cnblogs.com/LuckyBao/p/5981424.html