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解答例 - 実習課題1 - 10.Nestedタグライブラリ

(実習課題1)

以下のWebアプリケーションを作成しなさい。

  • 世界各国の一覧を表示しなさい。少なくとも5つ以上の国を表示する事。またそれぞれの国に関する情報を、少なくとも3つは表示する事。
  • 国の情報の管理はJava Beanで行う事。
  • Nestedタグライブラリを利用する事。

解答例

▼ディレクトリ構成は以下の通り

.
├─com
│  └─techscore
│      └─struts
│          └─chapter10
│              └─exercise1     useNestedTag.jsp
└─WEB-INF              web.xml,struts-config.xml
    ├─classes
    │  └─com
    │      └─techscore
    │          └─struts       EncodingFilter.class(2章 実習課題2と同じ),
    │              │           MessageResources.properties(中身は空)
    │              └─chapter10
    │                  └─exercise1 Country.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1
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter10.exercise1;

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

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

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

    public String getName(){
        return name;
    }

    public void setRank(int rank){
        this.rank = rank;
    }

    public int getRank(){
        return rank;
    }

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

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

}
<!-- useNestedTag.jsp -->
<!-- TECHSCORE Java JakartaStruts 10章 実習課題1 -->
<!-- Copyright (c) 2004 Four-Dimensional Data, Inc. -->

<%@ page contentType="text/html; charset=Windows-31J"
         session="false" 
         pageEncoding="Windows-31J"
         import="com.techscore.struts.chapter10.exercise1.Country" %>

<%@ 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1</title></head>
<body>

<%  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]);
    countries[1] = new Country("中国", 2, medal[1]);
    countries[2] = new Country("ロシア", 3, medal[2]);
    countries[3] = new Country("オーストラリア", 4, medal[3]);
    countries[4] = new Country("日本", 5, medal[4]); %>

<h3>2004アテネオリンピックメダル獲得枚数</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></tr>
    <logic:iterate collection="<%=countries %>" id="country">
        <nested:root name="country">
            <tr><td><nested:write property="rank" /></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></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>

▼web.xml

<?xml version="1.0" encoding="Windows-31J" ?>
<!DOCTYPE web-app PUBLIC
  "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  "http://java.sun.com/j2ee/dtds/web-app_2_3.dtd">

<web-app>

    <filter>
        <filter-name>Encoding</filter-name>
        <filter-class>com.techscore.struts.EncodingFilter</filter-class>
        <init-param>
            <param-name>encoding</param-name>
            <param-value>Windows-31J</param-value>
        </init-param>
    </filter>
    <filter-mapping>
        <filter-name>Encoding</filter-name>
        <url-pattern>/*</url-pattern>
    </filter-mapping>

    <servlet>
        <servlet-name>Action</servlet-name>
        <servlet-class>org.apache.struts.action.ActionServlet</servlet-class>
        <init-param>
            <param-name>config</param-name>
            <param-value>/WEB-INF/struts-config.xml</param-value>
        </init-param>
        <init-param>
            <param-name>debug</param-name>
            <param-value>6</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

    <servlet-mapping>
        <servlet-name>Action</servlet-name>
        <url-pattern>*.do</url-pattern>
    </servlet-mapping>

    <taglib>
        <taglib-uri>http://jakarta.apache.org/struts/tags-bean</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-bean.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://jakarta.apache.org/struts/tags-html</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-html.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://jakarta.apache.org/struts/tags-logic</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-logic.tld</taglib-location>
    </taglib>
    <taglib>
        <taglib-uri>http://jakarta.apache.org/struts/tags-nested</taglib-uri>
        <taglib-location>/WEB-INF/tld/struts-nested.tld</taglib-location>
    </taglib>

</web-app>

▼起動URLは以下の通り

WEB_ROOT/com/techscore/struts/chapter10/exercise1/useNestedTag.jsp

EncodingFilter.javaの参照(2章の実習課題2と同じ)


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