Struts2迭代器標籤用來迭代一個值,它可以是任何 java.util.Collection 或 java.util.Iterator的值。在本教程中,您將創建一個列表變數,使用迭代器標籤來遍曆,並得到使用IteratorStatus迭代狀態。
這裏創建一個Web工程:strut2iterator,來演示在多個複選框如何設置的默認值,整個專案的結構如下圖所示:
1. 動作
Action類有列表屬性,它包含多種美味 “KFC combo meals”.
IteratorKFCAction
package com.xuhuhu.common.action;
import java.util.ArrayList;
import java.util.List;
import com.opensymphony.xwork2.ActionSupport;
public class IteratorKFCAction extends ActionSupport{
private List<String> comboMeals;
public List<String> getComboMeals() {
return comboMeals;
}
public void setComboMeals(List<String> comboMeals) {
this.comboMeals = comboMeals;
}
public String execute() {
comboMeals = new ArrayList<String>();
comboMeals.add("Snack Plate");
comboMeals.add("Dinner Plate");
comboMeals.add("Colonel Chicken Rice Combo");
comboMeals.add("Colonel Burger");
comboMeals.add("O.R. Fillet Burger");
comboMeals.add("Zinger Burger");
return SUCCESS;
}
}
2. 迭代器 - Iterator示例
下麵的JSP頁面使用iterator標籤來遍曆顯示所有的“肯德基組合餐”名單。 在迭代器標籤,它包含了一個“status”的屬性,它用於在IteratorStatus類中聲明名稱。
IteratorStatus類用於獲取有關迭代的狀態資訊。支持屬性索引,計數,第一個,最後,奇,偶和等。
<%@ taglib prefix="s" uri="/struts-tags" %>
<html>
<head>
</head>
<body>
<h1>Struts2 <s:iterator>標籤示例</h1>
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</div></div><h2>Simple Iterator</h2>
<ol>
<s:iterator value="comboMeals">
<li><s:property /></li>
</s:iterator>
</ol>
<h2>Iterator with IteratorStatus</h2>
<table>
<s:iterator value="comboMeals" status="comboMealsStatus">
<tr>
<s:if test="#comboMealsStatus.even == true">
<td ><s:property/></td>
</s:if>
<s:elseif test="#comboMealsStatus.first == true">
<td><s:property/> (This is first value) </td>
</s:elseif>
<s:else>
<td><s:property/></td>
</s:else>
</tr>
</s:iterator>
</table>
</body>
</html>
3. struts.xml
<?xml version="1.0" encoding="UTF-8" ?> <!DOCTYPE struts PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN" "http://struts.apache.org/dtds/struts-2.0.dtd"> <struts> <constant name="struts.devMode" value="true" /> <package name="default" namespace="/" extends="struts-default"> <action name="iteratorKFCAction" class="com.xuhuhu.common.action.IteratorKFCAction" > <result name="success">/pages/iterator.jsp</result> </action> </package> </struts>
4. 示例
http://localhost:8080/struts2iterator/iteratorKFCAction.action

參考
下載代碼 - http://pan.baidu.com/s/1gdx02fp
