目次へ

解答例 - 実習課題3 - 9.Logicタグライブラリ2

(実習課題3)

実習課題2のアプリケーションを改良しなさい。

  • エラーがある場合とない場合とで、入力フォームに表示するメッセージを変えるようにしなさい。

解答例

▼ディレクトリ構成は以下の通り

.
├─com
│  └─techscore
│      └─struts
│          └─chapter9
│              └─exercise3     login.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)
    │              └─chapter9
    │                  └─exercise3 LoginForm.class,RegisterAction.class
    ├─lib              strutsライブラリjarファイル
    └─tld              struts-bean.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
/**
 * LoginForm.java
 * TECHSCORE Java JakartaStruts 9章 実習課題3
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter9.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 LoginForm extends ActionForm{
    private String userName = "";
  
    public void setUserName(String userName){
        this.userName = userName;
    }
  
    public String getUserName(){
        return userName;
    }

    public ActionErrors validate(ActionMapping mapping, HttpServletRequest request){

        ActionErrors errors = new ActionErrors();

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

        return errors;

    }
}
/**
 * RegisterAction.java
 * TECHSCORE Java JakartaStruts 9章 実習課題3
 *
 * Copyright (c) 2004 Four-Dimensional Data, Inc.
 *
 */

package com.techscore.struts.chapter9.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;
import javax.servlet.http.Cookie;
import java.net.URLEncoder;

public class RegisterAction extends Action{

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

        LoginForm loginForm = (LoginForm)form;
        Cookie cookie = new Cookie("userName", URLEncoder.encode(loginForm.getUserName(), "EUC-JP"));
        cookie.setMaxAge(60);
        response.addCookie(cookie);

        return mapping.findForward("login");

    }

}
<!-- login.jsp -->
<!-- TECHSCORE Java JakartaStruts 9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"
         import="java.net.URLDecoder" %>

<%@ 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" %>

<html:html>
<head><title>TECHSCORE Java JakartaStruts 9章 実習課題3</title></head>
<body>

<logic:notPresent cookie="userName">

    <logic:messagesNotPresent>
        <p>ユーザ名を入力してください。</p>
    </logic:messagesNotPresent>
    <logic:messagesPresent>
        <p><html:errors property="userName" /></p>
    </logic:messagesPresent>
    
    <html:form action="/com/techscore/struts/chapter9/exercise3/Login.do" method="post">
        <p>ユーザ名 : <html:text property="userName" /></p>
        <p><html:submit value="登録" /></p>
    </html:form>

</logic:notPresent>

<logic:present cookie="userName">

    <bean:cookie id="user" name="userName"/>
    <%=URLDecoder.decode(user.getValue(), "EUC-JP") %>さんようこそ

</logic:present>

</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>

    <form-beans>
        <form-bean name="loginForm93"
                   type="com.techscore.struts.chapter9.exercise3.LoginForm" />
    </form-beans>

    <action-mappings>
        <action path="/com/techscore/struts/chapter9/exercise3/Login"
                type="com.techscore.struts.chapter9.exercise3.RegisterAction"
                name="loginForm93"
                scope="request"
                validate="true"
                input="/com/techscore/struts/chapter9/exercise3/login.jsp">
            <forward name="login"
                     path="/com/techscore/struts/chapter9/exercise3/login.jsp"
                     redirect="true" />
        </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/chapter9/exercise3/login.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(実習課題2と同じ)


↑このページの先頭へ

こちらもチェック!

PR
  • XMLDB.jp