{"id":5820,"date":"2010-12-21T16:56:25","date_gmt":"2010-12-21T15:56:25","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=5820"},"modified":"2023-02-27T14:51:52","modified_gmt":"2023-02-27T14:51:52","slug":"implementare-il-design-pattern-mvc-in-java-con-le-servlet","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/implementare-il-design-pattern-mvc-in-java-con-le-servlet\/","title":{"rendered":"Implementare il design pattern MVC in Java con le servlet"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-5806\" style=\"margin-right: 10px;\" title=\"Java\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/12\/java-logo_svg-a.jpg\" alt=\"Java\" width=\"82\" height=\"110\" \/>La nozione di <em><a title=\"Pagina Wikipedia\" href=\"http:\/\/it.wikipedia.org\/wiki\/Design_pattern\" target=\"_blank\" rel=\"noopener noreferrer\">design pattern<\/a><\/em> negli ultimi anni \u00e8, per fortuna, entrata a far parte del bagaglio culturale indispensabile di ogni sviluppatore che si rispetti. In questa sede vedremo come sia molto semplice realizzare un&#8217;implementazione del pattern <em>Model-View-Controller<\/em>, solitamente abbreviato con <em>MVC<\/em>.<\/p>\n<h3>Front Controller \/ Dispatcher<\/h3>\n<p>La parte pi\u00f9 importante di un sistema MVC \u00e8 il cosiddetto <em>Front Controller<\/em>, a volte chiamato anche <em>Dispatcher<\/em>. Questo componente \u00e8 talmente importante che \u00e8 associato ad un design pattern a s\u00e8 stante! Vediamo come funziona.<\/p>\n<p>Il lavoro svoilto dal Front Controller \u00e8:<\/p>\n<ul>\n<li><strong>intercettare tutte le richieste<\/strong> al sistema;<\/li>\n<li><strong>farle elaborare<\/strong> al componente giusto, che talvolta viene chiamato <em>Azione<\/em> oppure semplicemente <em>Controller<\/em>;<\/li>\n<li><strong>redirezionare il flusso sulla visualizzazione<\/strong> corretta, chiamata <em>View<\/em>.<\/li>\n<\/ul>\n<p>Questa organizzazione del flusso esecuzione porta molti vantaggi:<\/p>\n<ul>\n<li>ogni componente esegue un compito semplice, \u00e8 quindi pi\u00f9 facile da realizzare, testare e modificare;<\/li>\n<li>l&#8217;interazione fra i componenti \u00e8 definita da &#8220;contratti&#8221; (interfacce) ben definiti. Ci\u00f2 permette di suddividere lo sviluppo in pi\u00f9 strati, che possono essere sostituiti in ogni momento da nuove implementazioni. Inoltre garantisce che non ci siano interferenze e che ognuno svolga il compito che gli spetta e nient&#8217;altro;<\/li>\n<li>un sistema cos\u00ec realizzato \u00e8 facilmente estendibile, \u00e8 possibile cio\u00e8 realizzare pi\u00f9 funzionalit\u00e0 con meno sforzo.<\/li>\n<\/ul>\n<h3>Realizzare un Dispatcher con una servlet<\/h3>\n<p>Realizzeremo ora un semplice Dispatcher utilizzando il meccanismo delle servlet. Le specifiche di funzionamento saranno le seguenti:<\/p>\n<ul>\n<li>le <em>azioni<\/em> dell&#8217;applicazione vengono invocate utilizzando dei path che terminano con estensione <em>.do<\/em>, ad esempio: <em>\/index.do<\/em>, <em>\/userList.do<\/em>, <em>\/admin.do<\/em> eccetera;<\/li>\n<li>ad ogni azione corrisponde un <em>controller<\/em>;<\/li>\n<li>il controller eseguir\u00e0 la sua azione e restituir\u00e0 una stringa contenente il nome della pagina da visualizzare.<\/li>\n<\/ul>\n<p>Per prima cosa definiamo l&#8217;interfaccia <em>Controller<\/em>:<\/p>\n<p>[java]package it.artera.webtut.mvc;<\/p>\n<p>import javax.servlet.http.HttpServletRequest;<br \/>\nimport javax.servlet.http.HttpServletResponse;<\/p>\n<p>\/**<br \/>\n * Interfaccia da implementare per realizzare le funzionalit\u00e0 dell&#8217;applicazione.<br \/>\n *\/<br \/>\npublic interface Controller {<br \/>\n  \/**<br \/>\n   * Esegue una singola azione.<br \/>\n   *<br \/>\n   * @param request<br \/>\n   * @param response<br \/>\n   * @return String con la pagina da mostrare dopo l&#8217;elaborazione<br \/>\n   *\/<br \/>\n  public String action(HttpServletRequest request, HttpServletResponse response);<br \/>\n}[\/java]<\/p>\n<p>Ed ecco invece l&#8217;implementazione del Front Controller:<\/p>\n<p>[java]package it.artera.webtut.mvc;<\/p>\n<p>import java.io.IOException;<br \/>\nimport java.util.HashMap;<br \/>\nimport java.util.Map;<br \/>\nimport java.util.regex.Pattern;<\/p>\n<p>import javax.servlet.ServletException;<br \/>\nimport javax.servlet.http.*;<\/p>\n<p>\/**<br \/>\n * Front Controller dell&#8217;applicazione<br \/>\n *\/<br \/>\npublic class DispatcherServlet extends HttpServlet {<\/p>\n<p>  private Map&lt;String, Controller&gt; controllers = new HashMap&lt;String, Controller&gt;();<\/p>\n<p>  @Override<br \/>\n  protected void doGet(HttpServletRequest req, HttpServletResponse resp)<br \/>\n      throws ServletException, IOException {<br \/>\n    internalExecute(req, resp);<br \/>\n  }<\/p>\n<p>  @Override<br \/>\n  protected void doPost(HttpServletRequest req, HttpServletResponse resp)<br \/>\n      throws ServletException, IOException {<br \/>\n    internalExecute(req, resp);<br \/>\n  }<\/p>\n<p>  private void internalExecute(HttpServletRequest req, HttpServletResponse resp)<br \/>\n      throws ServletException, IOException {<br \/>\n    \/\/ attenzione: nessun controllo degli errori!<br \/>\n    String uri = req.getRequestURI();<br \/>\n    \/\/ 1 &#8211; ricava il nome del Controller a partire dalla URI specificata<br \/>\n    Pattern pat = Pattern.compile(req.getContextPath() + &quot;\/(.*)&quot;);<br \/>\n    String controllerName = pat.matcher(uri).group(1);<br \/>\n    \/\/ 2 &#8211; carica l&#8217;implementazione del Controller<br \/>\n    Controller c = controllers.get(controllerName);<br \/>\n    \/\/ 3 &#8211; esegui il controller<br \/>\n    String outcome = c.action(req, resp);<br \/>\n    \/\/ 4 &#8211; mostra la view specificata<br \/>\n    req.getRequestDispatcher(outcome).forward(req, resp);<br \/>\n  }<br \/>\n}[\/java]<\/p>\n<p>Come potete notare la servlet memorizza una mappa contente la URI del controller invocato e l&#8217;implementazione corrispondente. In questo modo \u00e8 molto semplice estendere l&#8217;applicazione, basta aggiornare la mappa e il gioco \u00e8 fatto! Praticamente quasi tutti i framework MVC (Struts, Spring MVC ecc.) adottano un approccio molto simile, ovviamente con molte pi\u00f9 funzionalit\u00e0 ed una flessibilit\u00e0 maggiore.<\/p>\n<h3>Sviluppi<\/h3>\n<p>Nel prossimo appuntamento vedremo come implementare i <strong>controller e le view dell&#8217;applicazione<\/strong>.<\/p>\n<h3>Linkografia<\/h3>\n<ul>\n<li><a title=\"Wikipedia\" href=\"http:\/\/it.wikipedia.org\/wiki\/Design_pattern\" target=\"_blank\" rel=\"noopener noreferrer\">definizione di Design Pattern<\/a> (Wikipedia);<\/li>\n<li><a title=\"Wikipedia\" href=\"http:\/\/it.wikipedia.org\/wiki\/Model-View-Controller\" target=\"_blank\" rel=\"noopener noreferrer\">Model-View-Controller<\/a>;<\/li>\n<li><a title=\"Wikipedia\" href=\"http:\/\/it.wikipedia.org\/wiki\/Front_Controller_pattern\" target=\"_blank\" rel=\"noopener noreferrer\">Front Controller<\/a>;<\/li>\n<li><a title=\"Apache Struts\" href=\"http:\/\/struts.apache.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">Apache Struts<\/a> il framework che ha portato a notoriet\u00e0 il design pattern MVC per le web application Java;<\/li>\n<li><a title=\"Spring MVC\" href=\"http:\/\/static.springsource.org\/spring\/docs\/3.0.x\/reference\/mvc.html\" target=\"_blank\" rel=\"noopener noreferrer\">Spring MVC<\/a>, l&#8217;implementazione di Spring di MVC.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-5806\" style=\"margin-right: 10px;\" title=\"Java\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/12\/java-logo_svg-a.jpg\" alt=\"Java\" width=\"82\" height=\"110\" \/>La nozione di <em><a title=\"Pagina Wikipedia\" href=\"http:\/\/it.wikipedia.org\/wiki\/Design_pattern\" target=\"_blank\" rel=\"noopener noreferrer\">design pattern<\/a><\/em> negli ultimi anni \u00e8, per fortuna, entrata a far parte del bagaglio culturale indispensabile di ogni sviluppatore che si rispetti. In questa sede vedremo come sia molto semplice realizzare un&#8217;implementazione del pattern <em>Model-View-Controller<\/em>, solitamente abbreviato con <em>MVC<\/em>.<\/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":[208,172,173,143,174],"class_list":["post-5820","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-design-pattern","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 - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Implementare il design pattern MVC in Java con le servlet. Contattaci per una partnership! 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