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解答例 - 実習課題３ - ２１．表示するTileの動的な変更
最終更新日 2006.02.20
（実習課題３）
実習課題１のWebアプリケーションを改良しなさい。
- 「一覧の中からメニュー（Tile）として表示する項目を選択する機能」を追加すること。
- メニュー（Tile）項目は、HttpSessionで管理すること。
解答例
▼ディレクトリ構成は以下の通り
.
└─WEB-INF web.xml(21章 実習課題1と同じ）,struts-config.xml,tiles-defs.xml
├─classes
│ └─com
│ └─techscore
│ └─struts EncodingFilter.class（2章 実習課題2と同じ）,
│ │ MessageResources.properties(空ファイル)
│ └─chapter20
│ │ └─exercise1 CalendarTag.class(20章 実習課題1と同じ）
│ └─chapter21
│ └─exercise3 SelectMenuController.class,SelectMenuForm.class
├─JSP
│ └─com
│ └─techscore
│ └─struts
│ └─chapter21
│ └─exercise3 calendar.jsp,calendarPlus.jsp,clock.jsp,weather.jsp,selectMenu.jsp
├─lib strutsライブラリ jarファイル
└─tld original.tld(20章 実習課題1と同じ）
struts-tiles.tld,struts-html.tld,struts-beans.tld,struts-logic.tld
※strutsライブラリjarファイル
struts.jar,commons-beanutils.jar,commons-collections.jar,commons-digester.jar,commons-logging.jar,jakarta-oro.jar
/**
* SelectMenuController.java TECHSCORE Java JakartaStruts 21章
*
* Copyright (c) 2004 Four-Dimensional Data, Inc.
*
*/
package com.techscore.struts.chapter21.exercise3;
import org.apache.struts.tiles.Controller;
import org.apache.struts.tiles.ComponentContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.servlet.ServletContext;
public class SelectMenuController implements Controller {
public void perform(ComponentContext context, HttpServletRequest request,
HttpServletResponse response,
ServletContext servletContext) {
HttpSession session = request.getSession();
SelectMenuForm form = (SelectMenuForm) session.getAttribute("select1");
String[] menuName = form.getMenu();
context.putAttribute("menuName", menuName);
//コンテナの作成
String content = "";
//タイトルの作成
String title = "";
//パラメータ値によって表示を変更
if (request.getParameter("contentID") != null) {
int contentID = Integer.parseInt(request.getParameter("contentID"));
for (int i = 0; i < menuName.length; i++) {
if (contentID == i) {
if (menuName[i].equals("カレンダー")) {
content = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise3/calendar.jsp";
title = "Calendar";
}
if (menuName[i].equals("世界時計")) {
content = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise3/clock.jsp";
title = "Clock";
}
if (menuName[i].equals("天気予報")) {
content = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise3/weather.jsp";
title = "Weather";
}
}
}
} else {
content = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise3/calendar.jsp";
title = "Calendar";
}
//コンテナの登録
context.putAttribute("content", content);
//タイトルの登録
context.putAttribute("title", title);
}
}
/**
* SelectMenuForm.java
* TECHSCORE Java JakartaStruts 21章
*
* Copyright (c) 2004 Four-Dimensional Data, Inc.
*
*/
package com.techscore.struts.chapter21.exercise3;
import org.apache.struts.action.ActionForm;
public class SelectMenuForm extends ActionForm {
String[] menu = new String[3];
public void setMenu(String[] menu) {
this.menu = menu;
}
public String[] getMenu() {
return menu;
}
}
<!-- calendar.jsp -->
<!-- TECHSCORE Java JakartaStruts 21章 実習課題3 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->
<%@ page pageEncoding="Windows-31J"
import="java.util.Calendar" %>
<%@ taglib uri="http://www.4dd.co.jp/tags/original"
prefix="original" %>
<h2 align="center">カレンダー</h2>
<% Calendar calendar = Calendar.getInstance(); %>
<original:Calendar year="<%=Integer.toString(calendar.get(Calendar.YEAR)) %>"
month="<%=Integer.toString(calendar.get(Calendar.MONTH) + 1) %>" />
<!-- calendarPlus.jsp -->
<!-- TECHSCORE Java JakartaStruts 21章 実習課題3 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->
<%@ page contentType="text/html; charset=Windows-31J"
session="false"
pageEncoding="Windows-31J" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-tiles"
prefix="tiles" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic"
prefix="logic" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"
prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
prefix="html" %>
<html:html>
<head>
<tiles:importAttribute name="title" />
<title><bean:write name="title"/></title>
</head>
<body>
<table border="1" width="100%">
<tr>
<!-- メニュー部分-->
<td align="center" width="30%">
<h3>MENU</h3>
<bean:parameter id="contentID" name="contentID" value="3" />
<tiles:importAttribute name="menuName" />
<logic:iterate id="name" name="menuName" indexId="indexID" >
<!-- 現在表示しているコンテンツ以外についてだけMENUを表示 -->
<logic:notEqual name="indexID" value="<%=contentID %>" >
<html:link href="<%=request.getRequestURL().toString() %>"
paramId="contentID" paramName="indexID">
<p><bean:write name="name" /></p>
</html:link>
</logic:notEqual>
</logic:iterate>
</td>
<!-- コンテンツ部分-->
<tiles:importAttribute name="content" />
<td align="center">
<tiles:insert name="content" flush="false"/>
</td>
</tr>
</table>
</body>
</html:html>
<!-- clock.jsp -->
<!-- TECHSCORE Java JakartaStruts 21章 実習課題3 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->
<%@ page pageEncoding="Windows-31J"
import="java.text.DateFormat,
java.text.SimpleDateFormat,
java.util.Date,
java.util.TimeZone" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"
prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic"
prefix="logic" %>
<% String[] cities = {"Japan",
"America/Los-Angeles",
"America/New_York",
"Europe/Moscow",
"Pacific/Saipan"}; %>
<h2 align="center">世界時計</h2>
<% DateFormat dateFormat = new SimpleDateFormat("MM/dd HH:mm:ss"); %>
<table border="1" width="100%">
<logic:iterate collection="<%=cities %>" id="city" indexId="index">
<tr><td align="center">
<bean:write name="city" />
</td>
<td align="center">
<bean:define id="zoneName" name="city" type="java.lang.String" />
<% dateFormat.setTimeZone(TimeZone.getTimeZone(zoneName)); %>
<%= dateFormat.format(new Date()) %>
</td></tr>
</logic:iterate>
</table>
<!-- weather.jsp -->
<!-- TECHSCORE Java JakartaStruts 21章 実習課題3 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->
<%@ page pageEncoding="Windows-31J" %>
<h2 align="center">天気予報</h2>
<table border="1" width="100%">
<tr><td align="center">Tokyo</td><td align="center">晴れ</td></tr>
<tr><td align="center">Los-Angeles</td><td align="center">晴れ時々曇り</td></tr>
<tr><td align="center">New_York</td><td align="center">雨のち曇り</td></tr>
<tr><td align="center">Moscow</td><td align="center">曇りのち晴れ</td></tr>
<tr><td align="center">Saipan</td><td align="center">晴れのち曇り</td></tr>
</table>
<!-- selectMenu.jsp -->
<!-- TECHSCORE Java JakartaStruts 21章 実習課題3 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->
<%@ page contentType="text/html; charset=Windows-31J"
session="true"
pageEncoding="Windows-31J" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
prefix="html" %>
<html:html>
<head><title>セレクトメニュー</title></head>
<body>
メニューを選択してください<br />
<table border="1">
<html:form action="/com/techscore/struts/chapter21/exercise3/CalendarPlus2.do" method="post">
<html:select property="menu" size="3" multiple="true">
<html:option value="カレンダー">カレンダー</html:option>
<html:option value="世界時計">世界時計</html:option>
<html:option value="天気予報">天気予報</html:option>
</html:select>
<tr><td>
<html:submit value="選択" />
</td></tr>
</html:form>
</table>
</body>
</html:html>
▼struts-config.xml
<?xml version="1.0" encoding="Windows-31J" ?>
<!DOCTYPE struts-config PUBLIC
"-//Apache Software Foundation//DTD Struts Configuration 1.1//EN"
"http://jakarta.apache.org/struts/dtds/struts-config_1_1.dtd">
<struts-config>
<action-mappings>
<action path="/com/techscore/struts/chapter21/exercise3/CalendarPlus1"
type="org.apache.struts.actions.ForwardAction"
parameter="/WEB-INF/JSP/com/techscore/struts/chapter21/exercise3/selectMenu.jsp" />
<action path="/com/techscore/struts/chapter21/exercise3/CalendarPlus2"
type="org.apache.struts.actions.ForwardAction" name="select1"
scope="session" parameter="calendarPlus213" />
</action-mappings>
<message-resources parameter="com.techscore.struts.MessageResources" />
<plug-in className="org.apache.struts.tiles.TilesPlugin">
<set-property property="definitions-config"
value="/WEB-INF/tiles-defs.xml" />
</plug-in>
</struts-config>
▼tiles-defs.xml
<?xml version="1.0" encoding="Windows-31J" ?>
<!DOCTYPE tiles-definitions PUBLIC
"-//Apache Software Foundation//DTD Tiles Configuration//EN"
"http://jakarta.apache.org/struts/dtds/tiles-config_1_1.dtd">
<tiles-definitions>
<definition name="calendarPlus213"
path="/WEB-INF/JSP/com/techscore/struts/chapter21/exercise3/calendarPlus.jsp"
controllerClass="com.techscore.struts.chapter21.exercise3.SelectMenuController">
</definition>
</tiles-definitions>
▼起動URLは以下の通り
WEB_ROOT/com/techscore/struts/chapter21/exercise3/CalendarPlus1.do
EncodingFilter.javaの参照（2章の実習課題2と同じ）
CalendarTag.javaの参照（20章の実習課題1と同じ）
