解答例 - 実習課題２ - １７．その他の Action クラス

（実習課題２）

1章の実習課題 2 の Web アプリケーションを改良しなさい。

DispatchAction を使用すること。
リクエストパラメータ「op」の値が指定されなかった場合には任意のエラーページを表示すること

解答例

▼ディレクトリ構成は以下の通り

.
└─WEB-INF　　　　　　　　　　　　　　web.xml,struts-config.xml
    ├─classes
    │  └─com
    │      └─techscore
    │          └─struts　　　　　　 EncodingFilter.class（2章 実習課題2と同じ）
    │              └─chapter17
    │                  └─exercise2　ParameterCheckAction.class
    ├─JSP
    │  └─com
    │      └─techscore
    │          └─struts
    │              └─chapter17
    │                  └─exercise2　ip.jsp,none.jsp,time.jsp
    └─lib　　　　　　　　　　　　　　strutsライブラリjarファイル


※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

/**
 * ParameterCheckAction.java 
 * TECHSCORE Java JakartaStruts 17章 実習課題2
 * 
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 */
package com.techscore.struts.chapter17.exercise2;

import org.apache.struts.actions.DispatchAction;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class ParameterCheckAction extends DispatchAction {

    public ActionForward time(ActionMapping mapping, ActionForm form,
                              HttpServletRequest request,
                              HttpServletResponse response) throws Exception {

        return mapping.findForward("time");
    }

    public ActionForward ip(ActionMapping mapping, ActionForm form,
                            HttpServletRequest request,
                            HttpServletResponse response) throws Exception {

        return mapping.findForward("ip");
    }

    protected ActionForward unspecified(ActionMapping mapping, ActionForm form,
                                        HttpServletRequest request,
                                        HttpServletResponse response)
            throws Exception {

        return mapping.findForward("none");
    }

}

<!-- ip.jsp -->
<!-- TECHSCORE Java JakartaStruts 17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" %>

<html>
<head><title>TECHSCORE Java JakartaStruts 17章 実習課題2</title></head>
<body>

<%= java.net.InetAddress.getLocalHost().toString()%>

</body></html>

<!-- none.jsp -->
<!-- TECHSCORE Java JakartaStruts 17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" %>

<html>
<head><title>TECHSCORE Java JakartaStruts 17章 実習課題2</title></head>
<body>

<p>opパラメータ指定なし</p>

</body></html>

<!-- time.jsp -->
<!-- TECHSCORE Java JakartaStruts 17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" %>

<html>
<head><title>TECHSCORE Java JakartaStruts 17章 実習課題2</title></head>
<body>

<%=new java.util.Date() %>

</body></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/chapter17/exercise2/ParameterCheck"
                type="com.techscore.struts.chapter17.exercise2.ParameterCheckAction"
                parameter="op">
            <forward name="time"
                     path="/WEB-INF/JSP/com/techscore/struts/chapter17/exercise2/time.jsp" />
            <forward name="ip"
                     path="/WEB-INF/JSP/com/techscore/struts/chapter17/exercise2/ip.jsp" />
            <forward name="none"
                     path="/WEB-INF/JSP/com/techscore/struts/chapter17/exercise2/none.jsp" />
        </action>
        
    </action-mappings>

</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">

<!-- Copyright (c) 2002 by ObjectLearn. All Rights Reserved. -->
<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>

</web-app>

▼起動URLは以下の通り

WEB_ROOT/com/techscore/struts/chapter17/exercise2/ParameterCheck.do

EncodingFilter.javaの参照（2章の実習課題2と同じ）

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