各類遍歷用法
struts2<S:iterator>遍歷map小結
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","張三1","男",25));
studentMap.put("student2",new Student(new Long(2),"20034140202","張三2","女",26));
studentMap.put("student3",new Student(new Long(3),"20034140202","張三3","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","張三1","男",25));
list1.add(new Student(new Long(2),"20034140202","張三2","男",25));
list1.add(new Student(new Long(3),"20034140203","張三3","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遍歷總結</title>
</head>
<body>
<b>1.map中的value爲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爲Student對象</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爲String數組</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爲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>
-------------------------------------------------------------------------------------------------------------------------------------------------
四、普通屬性 public String execute(){ username = "zhangsan"; password = "123"; } <s:property value="username"/><br> <s:property value="password"/><br> 五、自定義對象 public String execute(){ userInfo = new UserInfo(); userInfo.setUsername("hhh"); userInfo.setPassword("111"); } <s:property value="userInfo.username"/><br> <s:property value="userInfo.password"/><br> 六、List（普通屬性） 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"/><br> </s:iterator> 或者： <s:iterator value="list"> <s:property/><br> </s:iterator> 六、List（自定義對象屬性） 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"/><br> </s:iterator> 或者： <s:iterator value="list"> <s:property value="username"/> <s:property value="password"/> <s:property value="roleInfo.rolename"/><br> </s:iterator> 七、數組（普通屬性） public String execute(){ strs = new String[2]; strs[0] = "as"; strs[1] = "asd"; } <s:iterator value="strs"> <s:property/><br> </s:iterator> 或者： <s:iterator value="strs" var="var"> <s:property value="var"/><br> </s:iterator> 八、數組（自定義對象屬性） 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"/><br> </s:iterator> 或者： <s:iterator value="strs" var="var"> <s:property value="#var.username"/> <s:property value="#var.password"/><br> </s:iterator> 八、數組（自定義對象屬性） 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"/><br> </s:iterator> 或者： <s:iterator value="strs"> <s:property value="username"/> <s:property value="password"/> <s:property value="roleInfo.rolename"/><br> </s:iterator> 八、Map（普通屬性） 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"/><br> </s:iterator> 或者： <s:iterator value="map"> <s:property value="key"/> <s:property value="value"/><br> </s:iterator> 八、Map（自定義對象屬性） 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"/><br> </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"/><br> </s:iterator> 八、Map嵌套Map（自定義對象屬性） 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"/><br> </s:iterator> </s:iterator>
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