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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)

original.tldの参照(20章の実習課題1と同じ)

web.xmlの参照(21章の実習課題1と同じ)


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