Struts2疊代器標籤用來疊代一個值,它可以是任何 java.util.Collection 或 java.util.Iterator的值。在本教學中,您將建立一個列表變數,使用疊代器標籤來遍歷,並得到使用IteratorStatus疊代狀態。
這裡建立一個Web工程:strut2iterator,來演示在多個核取方塊如何設定的預設值,整個專案的結構如下圖所示:
Action類有列表屬性,它包含多種美味 「KFC combo meals」.
IteratorKFCAction
package com.tw511.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; } }
下面的JSP頁面使用iterator標籤來遍歷顯示所有的「肯德基組合餐」名單。 在疊代器標籤,它包含了一個「status」的屬性,它用於在IteratorStatus類中宣告名稱。
<%@ taglib prefix="s" uri="/struts-tags" %> <html> <head> </head> <body> <h1>Struts2 <s:iterator>標籤範例</h1> <div><div class="ads-in-post hide_if_width_less_800"> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script> <!-- 728x90 - After2ndH4 --> <ins class="adsbygoogle hide_if_width_less_800" data-ad-client="ca-pub-2836379775501347" data-ad-slot="3642936086" data-ad-region="yiibairegion"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script> </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>
<?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.tw511.common.action.IteratorKFCAction" > <result name="success">/pages/iterator.jsp</result> </action> </package> </struts>
http://localhost:8080/struts2iterator/iteratorKFCAction.action