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解答例 - 実習課題2 - 10.Nestedタグライブラリ

(実習課題2)

実習課題1のアプリケーションを改良しなさい。

  • それぞれの国の首都の情報を追加して表示するようにする事。それぞれの首都に関する情報を少なくとも3つは表示する事。
  • 首都の情報の管理は、Java Beanで行う事。
  • Nestedタグライブラリを使用すること。

解答例

▼ディレクトリ構成は以下の通り

.
├─com
│  └─techscore
│      └─struts
│          └─chapter10
│              └─exercise2     useNestedTag.jsp
└─WEB-INF              web.xml(実習課題1と同じ),struts-config.xml(実習課題1と同じ)
    ├─classes
    │  └─com
    │      └─techscore
    │          └─struts       EncodingFilter.class(2章 実習課題2と同じ),
    │              │           MessageResources.properties(中身は空)
    │              └─chapter10
    │                  └─exercise2 Country.class,Capital.class
    ├─lib              strutsライブラリjarファイル
    └─tld              struts-bean.tld,struts-html.tld,struts-logic.tld,struts-nested.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
/**
 * Country.java
 * TECHSCORE Java JakartaStruts 10章 実習課題2
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter10.exercise2;

import com.techscore.struts.chapter10.exercise2.Capital;

public class Country {
    private String name;
    private int lank;
    private int[] medal = {0, 0, 0, 0};
    private Capital capital;

    public Country(String name, int lank, int[] medal, Capital capital) {
        this.name = name;
        this.lank = lank;
        this.medal = medal;
        this.capital = capital;
    }

    public void setName(String name){
        this.name = name;
    }

    public String getName(){
        return name;
    }

    public void setLank(int lank){
        this.lank = lank;
    }

    public int getLank(){
        return lank;
    }

    public void setMedal(int[] medal){
        this.medal = medal;
    }

    public int[] getMedal(){
        return medal;
    }

    public void setCapital(Capital capital){
        this.capital = capital;
    }

    public Capital getCapital(){
        return capital;
    }

}
/**
 * Capital.java
 * TECHSCORE Java JakartaStruts 10章 実習課題2
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter10.exercise2;

public class Capital {
    private String name;
    private int population;
    private int timeDifference;

    public Capital(String name, int population, int timeDifference) {
        this.name = name;
        this.population = population;
        this.timeDifference = timeDifference;
    }

    public void setName(String name){
        this.name = name;
    }

    public String getName(){
        return name;
    }

    public void setPopulation(int population){
        this.population = population;
    }

    public int getPopulation(){
        return population;
    }

    public void setTimeDifference(int timeDifference){
        this.timeDifference = timeDifference;
    }

    public int getTimeDifference(){
        return timeDifference;
    }

}
<!-- useNestedTag.jsp -->
<!-- TECHSCORE Java JakartaStruts 10章 実習課題2 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->

<%@ page contentType="text/html; charset=Windows-31J"
         session="false" 
         pageEncoding="Windows-31J"
         import="com.techscore.struts.chapter10.exercise2.Country,
                  com.techscore.struts.chapter10.exercise2.Capital" %>

<%@ taglib uri="http://jakarta.apache.org/struts/tags-bean"
           prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
           prefix="html" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-logic"
           prefix="logic" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-nested"
           prefix="nested" %>

<html:html>
<head><title>TECHSCORE Java JakartaStruts 10章 実習課題2</title></head>
<body>

<%  Capital[] capitals = new Capital[5];
    capitals[0] = new Capital("ワシントン", 61, -14);
    capitals[1] = new Capital("北京", 1036, -1);
    capitals[2] = new Capital("モスクワ", 875, -6);
    capitals[3] = new Capital("キャンベラ", 28, 1);
    capitals[4] = new Capital("東京", 798, 0);
    int[][] medal = {{35, 39, 29, 103},
                     {32, 17, 14, 63},
                     {27, 27, 38, 92},
                     {17, 16, 16, 49},
                     {16, 9, 12, 37}};
    Country[] countries = new Country[5];
    countries[0] = new Country("アメリカ", 1, medal[0], capitals[0]);
    countries[1] = new Country("中国", 2, medal[1], capitals[1]);
    countries[2] = new Country("ロシア", 3, medal[2], capitals[2]);
    countries[3] = new Country("オーストラリア", 4, medal[3], capitals[3]);
    countries[4] = new Country("日本", 5, medal[4], capitals[4]); %>

<h3>2004アテネオリンピックメダル獲得枚数と各国首都データ</h3>

<table border="2">
    <tr><td>順位</td><td>国名</td><td>金</td><td>銀</td><td>銅</td><td>計</td>
        <td>首都名</td><td>首都人口(万人)</td><td>日本との時差(時間)</td></tr>
    <logic:iterate collection="<%=countries %>" id="country" indexId="index">
        <nested:root name="country">
            <tr><td><nested:write property="lank" /></td>
                <td><nested:write property="name" /></td>
                <td><nested:write property="medal[0]" /></td>
                <td><nested:write property="medal[1]" /></td>
                <td><nested:write property="medal[2]" /></td>
                <td><nested:write property="medal[3]" /></td>
                <nested:nest property="capital">
                    <td><nested:write property="name" /></td>
                    <td><nested:write property="population" /></td>
                    <td><nested:write property="timeDifference" /></td>
                </nested:nest>
            </tr>
        </nested:root>
    </logic:iterate>
</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>

    <message-resources parameter="com.techscore.struts.MessageResources" />

</struts-config>

▼起動URLは以下の通り

WEB_ROOT/com/techscore/struts/chapter10/exercise2/useNestedTag.jsp

web.xmlの参照(実習課題1と同じ)

struts-config.xmlの参照(実習課題1と同じ)

EncodingFilter.javaの参照(2章の実習課題2と同じ)


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