{"id":6225,"date":"2011-01-27T15:32:57","date_gmt":"2011-01-27T14:32:57","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=6225"},"modified":"2023-02-27T14:51:13","modified_gmt":"2023-02-27T14:51:13","slug":"implementare-il-design-pattern-mvc-in-java-con-le-servlet-3a-parte","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/implementare-il-design-pattern-mvc-in-java-con-le-servlet-3a-parte\/","title":{"rendered":"Implementare il design pattern MVC in Java con le servlet &#8211; 3a parte"},"content":{"rendered":"<p><img decoding=\"async\" class=\"size-full wp-image-5806 alignleft\" title=\"Java\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/12\/java-logo_svg-a.jpg\" alt=\"Java\" width=\"80\" height=\"106\" style=\"margin-right:10px;\"\/><br \/>In questo articolo vedremo come processare e validare i form con il nostro mini-framework MVC. Per il codice e la configurazione vi rimandiamo alla <a title=\"Prima parte\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/implementare-il-design-pattern-mvc-in-java-con-le-servlet\" target=\"_blank\" rel=\"noopener noreferrer\">prima<\/a> e <a title=\"Seconda parte\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/implementare-il-design-pattern-mvc-in-java-con-le-servlet-2a-parte\" target=\"_blank\" rel=\"noopener noreferrer\">seconda<\/a> parte.<\/p>\n<h3>Processamento dei form<\/h3>\n<p>La gestione dei form \u00e8 sicuramente la pi\u00f9 importante funzionalit\u00e0 di una web application, in effetti \u00e8 ci\u00f2 che distingue un sito statico da un&#8217;applicazione vera e propria. In genere le fasi di elaborazione sono le seguenti:<\/p>\n<ul>\n<li>all&#8217;utente viene presentata una pagina con un form. Questa pagina viene spesso indicata come <em>form view<\/em>;<\/li>\n<li>l&#8217;utente inserisce dei dati e preme un pulsante per l&#8217;invio;<\/li>\n<li>se ha commesso degli errori nella compilazione il form gli viene riproposto, aggiungendo uno o pi\u00f9 messaggi d&#8217;errore. A questo punto l&#8217;utente re-invia il form;<\/li>\n<li>se i dati sono corretti l&#8217;applicazione continua il suo flusso di lavoro, che pu\u00f2 essere una nuova pagina, lo stesso form, un file da scaricare, e cos\u00ec via.<\/li>\n<\/ul>\n<h3>Realizzazione del controller<\/h3>\n<p>Questo \u00e8 il codice del controller:<\/p>\n<p>[java]package it.artera.webtut.mvc;<\/p>\n<p>import java.util.*;<\/p>\n<p>import javax.servlet.http.*;<\/p>\n<p>public class HelloController implements Controller {<\/p>\n<p>  private String formView    = &quot;\/WEB-INF\/pages\/helloForm.jsp&quot;;<br \/>\n  private String successView = &quot;\/WEB-INF\/pages\/helloSuccess.jsp&quot;;<\/p>\n<p>  public String action(HttpServletRequest request, HttpServletResponse response) {<\/p>\n<p>    String viewName = formView;<\/p>\n<p>    \/\/ se il form \u00e8 stato inviato il metodo HTTP \u00e8 POST<br \/>\n    if (&quot;POST&quot;.equalsIgnoreCase(request.getMethod())) {<br \/>\n      \/\/ validazione dei dati<br \/>\n      String name = request.getParameter(&quot;name&quot;);<br \/>\n      String age = request.getParameter(&quot;age&quot;);<\/p>\n<p>      List&amp;lt;String&amp;gt; errors = new ArrayList&amp;lt;String&amp;gt;();<br \/>\n      \/\/ controlla campi obbligatori<br \/>\n      if (name == null || name.trim().length() == 0) {<br \/>\n        errors.add(&quot;\\&quot;Nome\\&quot; \u00e8 un campo obbligatorio&quot;);<br \/>\n      }<br \/>\n      if (age == null || age.trim().length() == 0) {<br \/>\n        errors.add(&quot;\\&quot;Eta&#8217;\\&quot; \u00e8 un campo obbligatorio&quot;);<br \/>\n      }<\/p>\n<p>      \/\/ se non ci sono stati errori&#8230;<br \/>\n      if (errors.size() == 0) {<br \/>\n        \/\/ &#8230; mostra la pagina di destinazione<br \/>\n        viewName = successView;<br \/>\n      } else {<br \/>\n        request.setAttribute(&quot;errors&quot;, errors);<br \/>\n      }<\/p>\n<p>    }<\/p>\n<p>    return viewName;<br \/>\n  }<\/p>\n<p>}[\/java]<\/p>\n<p>Il suo funzionamento \u00e8 molto semplice:<\/p>\n<ul>\n<li>quando viene eseguita una richiesta HTTP GET al client viene inviata la pagina con il form da compilare;<\/li>\n<li>a fronte di una POST, ovvero il submit di un form, il controller valida l&#8217;input e agisce di conseguenza.<\/li>\n<\/ul>\n<h3>Il form<\/h3>\n<p>La pagina JSP che ospita il form \u00e8 <em>\/WEB-INF\/pages\/helloForm.jsp<\/em>, il cui codice \u00e8:<\/p>\n<p>[html]&lt;html xmlns=&quot;http:\/\/www.w3.org\/1999\/xhtml&quot;&gt;<br \/>\n&lt;%@ taglib uri=&quot;http:\/\/java.sun.com\/jsp\/jstl\/core&quot; prefix=&quot;c&quot; %&gt;<br \/>\n&lt;%@ taglib uri=&quot;http:\/\/java.sun.com\/jsp\/jstl\/functions&quot; prefix=&quot;fn&quot; %&gt;<br \/>\n&lt;head&gt;<br \/>\n  &lt;title&gt;helloForm.jsp&lt;\/title&gt;<br \/>\n&lt;\/head&gt;<br \/>\n&lt;body&gt;<\/p>\n<p>&lt;c:if test=&quot;${! empty(errors)}&quot;&gt;<br \/>\n  &lt;h4&gt;Correggere questi errori&lt;\/h4&gt;<br \/>\n  &lt;ul&gt;<br \/>\n    &lt;c:forEach items=&quot;${errors}&quot; var=&quot;msg&quot;&gt;<br \/>\n      &lt;li&gt;${fn:escapeXml(msg)}&lt;\/li&gt;<br \/>\n    &lt;\/c:forEach&gt;<br \/>\n  &lt;\/ul&gt;<br \/>\n&lt;\/c:if&gt;<\/p>\n<p>&lt;form action=&quot;hello.do&quot; method=&quot;post&quot;&gt;<br \/>\n  &lt;p&gt;<br \/>\n    &lt;label for=&quot;name&quot;&gt;Nome&lt;\/label&gt;<br \/>\n    &lt;input id=&quot;name&quot; name=&quot;name&quot; value=&quot;${param.name}&quot; \/&gt;<br \/>\n  &lt;\/p&gt;<br \/>\n  &lt;p&gt;<br \/>\n    &lt;label for=&quot;age&quot;&gt;Et\u00e0&lt;\/label&gt;<br \/>\n    &lt;input id=&quot;age&quot; name=&quot;age&quot; value=&quot;${param.age}&quot; \/&gt;<br \/>\n  &lt;\/p&gt;<br \/>\n  &lt;button type=&quot;submit&quot;&gt;Invia&lt;\/button&gt;<br \/>\n&lt;\/form&gt;<\/p>\n<p>&lt;\/body&gt;<br \/>\n&lt;\/html&gt;[\/html]<\/p>\n<p>La pagina finale, ovvero quella che verr\u00e0 mostrata dopo il submit del form, \u00e8 <em>\/WEB-INF\/pages\/helloSuccess.jsp<\/em>, il cui contenuto (per gli scopi dell&#8217;articolo) \u00e8 ininfluente.<\/p>\n<h3>Test<\/h3>\n<p>Ora \u00e8 possibile testare il nostro controller, \u00e8 sufficiente aprire la &#8220;pagina virtuale&#8221; <em>\/hello.do<\/em> sulla nostra applicazione, per vedere un form con i campi <em>Nome<\/em> ed <em>Et\u00e0<\/em> vuoti. Se proviamo ad inviarlo senza compilare uno dei due campi, la pagina ci restituir\u00e0 una lista degli errori da correggere.<\/p>\n<h3>Linkografia<\/h3>\n<ul>\n<li><a title=\"Prima parte\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/implementare-il-design-pattern-mvc-in-java-con-le-servlet\" target=\"_blank\" rel=\"noopener noreferrer\">prima parte<\/a>;<\/li>\n<li><a title=\"Seconda parte\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/implementare-il-design-pattern-mvc-in-java-con-le-servlet-2a-parte\" target=\"_blank\" rel=\"noopener noreferrer\">seconda parte<\/a>.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"size-full wp-image-5806 alignleft\" title=\"Java\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/12\/java-logo_svg-a.jpg\" alt=\"Java\" width=\"80\" height=\"106\" style=\"margin-right:10px;\"\/><br \/>In questo articolo vedremo come processare e validare i form con il nostro mini-framework MVC. Per il codice e la configurazione vi rimandiamo alla <a title=\"Prima parte\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/implementare-il-design-pattern-mvc-in-java-con-le-servlet\" target=\"_blank\" rel=\"noopener noreferrer\">prima<\/a> e <a title=\"Seconda parte\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/implementare-il-design-pattern-mvc-in-java-con-le-servlet-2a-parte\" target=\"_blank\" rel=\"noopener noreferrer\">seconda<\/a> parte<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","footnotes":""},"categories":[108],"tags":[208,102,132,172,173,143,174],"class_list":["post-6225","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-design-pattern","tag-form","tag-html","tag-java","tag-jsp","tag-mvc","tag-servlet"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 Implementare il design pattern MVC in Java con le servlet - 3a parte - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Implementare il design pattern MVC in Java con le servlet - 3a parte. 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