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解答例 - 実習課題4 - 21.表示するTileの動的な変更

最終更新日 2006.02.20

(実習課題4)

実習課題3のWebアプリケーションを改良しなさい。

  • 選択したTileをまとめて1つのページに表示するレイアウトに変えなさい。
  • メニューは無くてよい。

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         
    │                  └─exercise4 SelectMenuController.class,SelectMenuForm.class
    ├─JSP
    │  └─com
    │      └─techscore
    │          └─struts
    │              └─chapter21
    │                  └─exercise4 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-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.exercise4;

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;
import java.util.List;
import java.util.ArrayList;

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("select2");
        String[] menuName = form.getMenu();
        String[] menuUrl = new String[3];

        //メニューリストの作成
        List menuList = new ArrayList();
        for (int i = 0; i < menuName.length; i++) {
            if (menuName[i].equals("カレンダー")) {
                menuUrl[i] = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise4/calendar.jsp";
            }
            if (menuName[i].equals("世界時計")) {
                menuUrl[i] = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise4/clock.jsp";
            }
            if (menuName[i].equals("天気予報")) {
                menuUrl[i] = "/WEB-INF/JSP/com/techscore/struts/chapter21/exercise4/weather.jsp";
            }
            menuList.add(menuUrl[i]);   
        }
        //メニューリストの登録
        context.putAttribute("menuList", menuList);
    }

}
/**
 * SelectMenuForm.java TECHSCORE Java JakartaStruts 21章
 * 
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *  
 */

package com.techscore.struts.chapter21.exercise4;

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4 -->
<!-- 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4 -->
<!-- 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-html"
           prefix="html" %>

<html:html>

<head><title>TECHSCORE Java JakartaStruts 21章 実習課題4</title></head>

<body>

<table border="1" width="100%">
    <tiles:importAttribute name="menuList" />
    <logic:iterate id="menuUrl" name="menuList" >
        <!-- コンテンツ部分-->
        <td align="center">
            <tiles:insert beanName="menuUrl" flush="false"/>
        </td>
    </logic:iterate>
</table>

</body>
</html:html>
<!-- clock.jsp -->
<!-- TECHSCORE Java JakartaStruts 21章 実習課題4 -->
<!-- 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4 -->
<!-- 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4 -->
<!-- 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/exercise4/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/exercise4/CalendarPlus1"
                           type="org.apache.struts.actions.ForwardAction"
                           parameter="/WEB-INF/JSP/com/techscore/struts/chapter21/exercise4/selectMenu.jsp" />

                <action path="/com/techscore/struts/chapter21/exercise4/CalendarPlus2" 
                           type="org.apache.struts.actions.ForwardAction" name="select2" 
			   scope="session" parameter="calendarPlus214" />

    </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="calendarPlus214"
                path="/WEB-INF/JSP/com/techscore/struts/chapter21/exercise4/calendarPlus.jsp"
                controllerClass="com.techscore.struts.chapter21.exercise4.SelectMenuController">
    </definition>

</tiles-definitions>

▼起動URLは以下の通り

WEB_ROOT/com/techscore/struts/chapter21/exercise4/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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