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解答例 - 実習課題3 - 5.パラメータ値のチェックとHTMLタグライブラリ

(実習課題3)

実習課題2のWebアプリケーションを改良しなさい。

  • HTMLタグライブラリのformおよびsubmitタグを使用すること。
  • cancelタグを追加し、submitタグとの違いを確認する事。

解答例

▼ディレクトリ構成は以下の通り

.
├─com
│  └─techscore
│      └─struts
│          └─chapter5
│              └─exercise3     inputEmployee.jsp,outputEmployee.jsp
└─WEB-INF              web.xml(実習課題1と同じ),struts-config.xml
    ├─classes
    │  └─com
    │      └─techscore
    │          └─struts       EncodingFilter.class(2章 実習課題2と同じ),
    │              │           MessageResources.properties(実習課題2と同じ)
    │              └─chapter5
    │                  └─exercise3 InputEmployeeForm.class,OutputEmployeeAction.class
    ├─lib              strutsライブラリjarファイル
    └─tld              struts-bean.tld,struts-html.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
/**
 * InputEmployeeForm.java
 * TECHSCORE Java JakartaStruts 5章 実習課題3
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter5.exercise3;

import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionMapping;
import org.apache.struts.action.ActionErrors;
import org.apache.struts.action.ActionError;
import javax.servlet.http.HttpServletRequest;

public class InputEmployeeForm extends ActionForm{
    private String name = "";
    private String[] address = {"", ""};
    //※配列のインデックスを指定する場合には宣言時に配列の確保が必要
    private int number = 0;
    private boolean gender = false;
    private boolean existAddress2 = false;
  
    public void setName(String name){
        this.name = name;
    }
  
    public String getName(){
        return name;
    }

    public void setAddress(String address[]){
        this.address = address;
    }
  
    public String[] getAddress(){
        return address;
    }

    public void setNumber(int number){
        this.number = number;
    }
  
    public int getNumber(){
        return number;
    }

    public void setGender(boolean gender){
        this.gender = gender;
    }
  
    public boolean getGender(){
        return gender;
    }

    public void setExistAddress2(boolean existAddress2){
        this.existAddress2 = existAddress2;
    }
  
    public boolean getExistAddress2(){
        return existAddress2;
    }

//以下のメソッドがない場合にはチェックボックスの値が初期化されない
    public void reset(ActionMapping mapping, HttpServletRequest request){
        existAddress2 = false;
    }

    public ActionErrors validate(ActionMapping mapping, HttpServletRequest request){

        ActionErrors errors = new ActionErrors();

        if (name.equals("")) {
            errors.add("name", new ActionError("invalid.name"));
        }

        if (address[0].equals("")) {
            errors.add("address", new ActionError("invalid.address"));
        }

        if ((existAddress2) && (address[1].equals(""))) {
            errors.add("address2", new ActionError("invalid.address2"));
        }

        if (number == 0) {
            errors.add("number", new ActionError("invalid.number"));
        }

        return errors;

    }
}
/**
 * OutputEmployeeAction.java
 * TECHSCORE Java JakartaStruts 5章 実習課題3
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter5.exercise3;

import org.apache.struts.action.Action;
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 OutputEmployeeAction extends Action{

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

        if (isCancelled(request)) {
            return mapping.getInputForward();
        }

        return mapping.findForward("output");

    }

}
/**
 * OutputEmployeeAction.java
 * TECHSCORE Java JakartaStruts 5章 実習課題3
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter5.exercise3;

import org.apache.struts.action.Action;
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 OutputEmployeeAction extends Action{

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

        if (isCancelled(request)) {
            return mapping.getInputForward();
        }

        return mapping.findForward("output");

    }

}
<!-- outputEmployee.jsp -->
<!-- TECHSCORE Java JakartaStruts 5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-bean"
           prefix="bean" %>
<%@ taglib uri="http://jakarta.apache.org/struts/tags-html"
           prefix="html" %>

<html>
<head><title>TECHSCORE Java JakartaStruts 5章 実習課題3</title></head>
<body>

<h2>社員データ入力</h2>
<p>登録された社員データは以下の通りです</p>

<jsp:useBean id="inputEmployeeForm53"
             class="com.techscore.struts.chapter5.exercise3.InputEmployeeForm"
             scope="request" />

<table border="2">
    <tr><th>氏名</th>
    <td><bean:write name="inputEmployeeForm53" scope="request" property="name" /></td></tr>

    <tr><th>住所</th>
    <td><bean:write name="inputEmployeeForm53" scope="request" property="address[0]" /></td></tr>

    <% if (inputEmployeeForm53.getExistAddress2()) { %>
           <tr><th>住所2</th>
           <td><bean:write name="inputEmployeeForm53" scope="request" property="address[1]" /></td></tr>
    <% } %>

    <tr><th>社員番号</th>
    <td><bean:write name="inputEmployeeForm53" scope="request" property="number" /></td></tr>

    <% if (inputEmployeeForm53.getGender()) { %>
           <tr><th>性別</th><td>男</td></tr>
    <% } else { %>
           <tr><th>性別</th><td>女</td></tr>
    <% } %>
</table>

<p><a href="<%=request.getContextPath() %>/com/techscore/struts/chapter5/exercise3/inputEmployee.jsp">入力に戻る</p>

</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>

    <form-beans>
        <form-bean name="inputEmployeeForm53"
                   type="com.techscore.struts.chapter5.exercise3.InputEmployeeForm" />
    </form-beans>

    <action-mappings>
        <action path="/com/techscore/struts/chapter5/exercise3/InputEmployee"
                type="com.techscore.struts.chapter5.exercise3.OutputEmployeeAction"
                name="inputEmployeeForm53"
                scope="request"
                validate="true"
                input="/com/techscore/struts/chapter5/exercise3/inputEmployee.jsp">
            <forward name="output"
                     path="/com/techscore/struts/chapter5/exercise3/outputEmployee.jsp" />
        </action>
    </action-mappings>

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

</struts-config>

▼起動URLは以下の通り

WEB_ROOT/com/techscore/struts/chapter5/exercise3/inputEmployee.jsp

web.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)

MessageResources.propertiesの参照(実習課題2と同じ)

MessageResource.txtの参照(実習課題2と同じ)


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