各种遍历用法

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我是靠谱客的博主犹豫钢笔，最近开发中收集的这篇文章主要介绍各种遍历用法，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

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>