{"id":7604,"date":"2011-06-13T15:46:39","date_gmt":"2011-06-13T13:46:39","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=7604"},"modified":"2023-02-27T14:49:02","modified_gmt":"2023-02-27T14:49:02","slug":"utilizzare-spring-nelle-web-application-parte-12","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/utilizzare-spring-nelle-web-application-parte-12\/","title":{"rendered":"Utilizzare Spring nelle web application &#8211; parte 12"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-6347\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2011\/02\/Logo_Spring_252x1501.png\" alt=\"\" width=\"142\" height=\"80\" style=\"margin-right:10px\" \/>Dopo esserci presi una &#8220;pausa di riflessione&#8221; nello <a href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-11\" target=\"_blank\" rel=\"noopener noreferrer\">scorso articolo<\/a>, riprendiamo con lo sviluppo dell&#8217;applicazione. In questo appuntamento realizzeremo la <strong>pagina di dettaglio di un&#8217;inserzione<\/strong>.<\/p>\n<h3>Servizi esistenti<\/h3>\n<p>Negli articoli precedenti abbiamo gi\u00e0 implementato le funzionalit\u00e0 necessarie a questo use case, sia nella classe <em>InsertionService<\/em>, utilizzata dai controller di Spring MVC, che in <em>InsertionDao<\/em>. In entrambi i casi il metodo realizzato \u00e8 <em>getInsertion(long id)<\/em>, che recupera un oggetto <em>Insertion<\/em> tramite l&#8217;ID progessivo (chiave primaria della tabella <em>insertions<\/em>). Non ci resta quindi che realizzare il <strong>controller<\/strong> e la <strong>pagina JSP<\/strong> che visualizza l&#8217;inserzione.<\/p>\n<h3>Realizzare il controller<\/h3>\n<p>Creiamo la classe <em>InsertionDetailController<\/em> nel package <em>it.artera.springtut.controller<\/em>:<br \/>\n[java]package it.artera.springtut.controller;<\/p>\n<p>import it.artera.springtut.model.Insertion;<br \/>\nimport it.artera.springtut.service.InsertionService;<\/p>\n<p>import org.springframework.beans.factory.annotation.Autowired;<br \/>\nimport org.springframework.stereotype.Controller;<br \/>\nimport org.springframework.web.bind.annotation.*;<br \/>\nimport org.springframework.web.servlet.ModelAndView;<\/p>\n<p>@Controller<br \/>\n@RequestMapping(&quot;\/detail&quot;)<br \/>\npublic class InsertionDetailController {<\/p>\n<p>    private InsertionService insertionService;<\/p>\n<p>    @Autowired<br \/>\n    public void setInsertionService(InsertionService insertionService) {<br \/>\n        this.insertionService = insertionService;<br \/>\n    }<\/p>\n<p>    @RequestMapping(value = &quot;\/{id}.*&quot;, method = RequestMethod.GET)<br \/>\n    public ModelAndView get(@PathVariable long id) {<br \/>\n        ModelAndView mav = new ModelAndView(&quot;detail&quot;);<br \/>\n        Insertion i = insertionService.getInsertion(id);<br \/>\n        mav.addObject(&quot;insertion&quot;, i);<br \/>\n        return mav;<br \/>\n    }<br \/>\n}[\/java]<br \/>\nCome potete notare abbiamo fatto un ampio uso di annotazioni:<\/p>\n<ul>\n<li><em>@Controller<\/em> indica a Spring che questa classe risponder\u00e0 a richieste HTTP;<\/li>\n<li><em>@RequestMapping<\/em> utilizzata per configurare la reazione del controller alle richieste HTTTP;<\/li>\n<li><em>@Autowired<\/em> provvede ad assegnare alla variabile <em>insertionService<\/em> un&#8217;istanza di <em>it.artera.springtut.service.InsertionService<\/em> gi\u00e0 pronta per l&#8217;utilizzo.<\/li>\n<\/ul>\n<p><strong>L&#8217;annotazione <em>@RequestMapping<\/em> \u00e8 uno strumento<\/strong> davvero <strong>molto potente e flessibile<\/strong>. A livello di classe \u00e8 utilizzata per indicare il path principale a cui risponder\u00e0 il controller, mentre a livello di metodo pu\u00f2 essere arricchita da riferimenti a parametri nella URL, utilizando i cosiddetti <strong><em><a title=\"Spring Reference - 15.3.2.1\" href=\"http:\/\/static.springsource.org\/spring\/docs\/3.0.x\/spring-framework-reference\/html\/mvc.html#mvc-ann-requestmapping-uri-templates\" target=\"_blank\" rel=\"noopener noreferrer\">URI templates<\/a><\/em><\/strong> (cfr. paragrafo 15.3.2.1 della <em>Spring Reference<\/em>). Il funzionamento in realt\u00e0 \u00e8 piuttosto intuitivo:<\/p>\n<ul>\n<li>l&#8217;indicazione <em>method = RequestMethod.GET<\/em> indica a quale <em>verbo HTTP<\/em> (<em>GET<\/em>, <em>PUT<\/em>, <em>POST<\/em> o <em>DELETE<\/em>) risponde il metodo <em>get()<\/em>;<\/li>\n<li>il path utilizzato <em>&#8220;\/{id}.*&#8221;<\/em> indica che nella url verr\u00e0 specificato l&#8217;ID dell&#8217;inserzione, pi\u00f9 un&#8217;estensione (ad esempio <em>.html<\/em>, <em>.xml<\/em> o altro);<\/li>\n<li>l&#8217;annotazione <em>@PathVariable long id<\/em> rende disponibile come parametro della funzione il valore intercettato dall&#8217;URI template.<\/li>\n<\/ul>\n<p>Questo stile di configurazione delle applicazioni \u00e8 denominato <em><a title=\"Representational State Transfer (REST)\" href=\"http:\/\/it.wikipedia.org\/wiki\/Representational_State_Transfer\" target=\"_blank\" rel=\"noopener noreferrer\">Representational State Transfer (REST)<\/a><\/em>, ed \u00e8 lo stile adottato da Spring MVC dalla versione 2.5 in su (in questo tutorial utilizziamo la versione 3.0.x); il suo pregio principale \u00e8 saper fornire ai client un <strong>modo molto semplice per accedere ai dati della nostra applicazione<\/strong>, in maniera <strong>stateless<\/strong> e <strong>utilizzando semplici URL<\/strong>. Ad esempio alla stessa URL<\/p>\n<p><code>http:\/\/www.example.com\/detail\/1.html<\/code><\/p>\n<p>possono essere associate diverse operazioni, a seconda del verbo HTTP utilizzato:<\/p>\n<ul>\n<li><em>GET<\/em>: il client legge l&#8217;inserzione con ID = 1;<\/li>\n<li><em>POST<\/em>: il client invia i dati da salvare per l&#8217;inserzione;<\/li>\n<li><em>DELETE<\/em>: il client richiede la cancellazione dell&#8217;inserzione.<\/li>\n<\/ul>\n<p>Infine, facciamo notare come l&#8217;istruzione:<\/p>\n<pre>mav = new ModelAndView(\"detail\")<\/pre>\n<p>richieda a Spring di andare sulla <em>view<\/em> denominata <em>&#8220;detail&#8221;<\/em>, una volta terminata l&#8217;esecuzione del controller. La <a title=\"Utilizzare Spring nelle web application - parte 6\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-6\" target=\"_blank\" rel=\"noopener noreferrer\">configurazione delle view di tipo JSP \u00e8 definita nel bean con <em>id=&#8221;viewResolver&#8221;<\/em> nel file <em>dispatcher-servlet.xml<\/em><\/a>. Nel nostro caso la view con nome &#8220;detail&#8221; ci far\u00e0 &#8220;atterrare&#8221; sulla pagina <em>src\/main\/webapp\/WEB-INF\/pages\/detail.jsp<\/em>.<\/p>\n<h3>Pagina JSP<\/h3>\n<p>Nella <em>detail.jsp<\/em> dobbiamo inserire questo codice:<br \/>\n[html]&lt;%@ page language=&quot;java&quot; contentType=&quot;text\/html; charset=UTF-8&quot; pageEncoding=&quot;UTF-8&quot;%&gt;<br \/>\n&lt;!DOCTYPE html PUBLIC &quot;-\/\/W3C\/\/DTD XHTML 1.0 Transitional\/\/EN&quot;<br \/>\n    &quot;http:\/\/www.w3.org\/TR\/xhtml1\/DTD\/xhtml1-transitional.dtd&quot;&gt;<br \/>\n&lt;%@ include file=&quot;common\/taglibs.jsp&quot;%&gt;<br \/>\n&lt;html&gt;<br \/>\n&lt;head&gt;<br \/>\n  &lt;title&gt;Dettaglio inserzione: ${fn:escapeXml(insertion.title)}&lt;\/title&gt;<br \/>\n&lt;\/head&gt;<br \/>\n&lt;body&gt;<br \/>\n&lt;dl&gt;<br \/>\n  &lt;dd&gt;Titolo&lt;\/dd&gt;<br \/>\n  &lt;dt&gt;${fn:escapeXml(insertion.title)}&lt;\/dt&gt;<br \/>\n  &lt;dd&gt;Prezzo&lt;\/dd&gt;<br \/>\n  &lt;dt&gt;${fn:escapeXml(insertion.price)} &amp;amp;euro;&lt;\/dt&gt;<br \/>\n  &lt;dd&gt;Data di inserimento&lt;\/dd&gt;<br \/>\n  &lt;dt&gt;<br \/>\n    &lt;fmt:formatDate value=&quot;${insertion.creationDate}&quot; \/&gt;<br \/>\n  &lt;\/dt&gt;<br \/>\n  &lt;dt&gt;Foto&lt;\/dt&gt;<br \/>\n  &lt;dd&gt;<br \/>\n    &lt;c:choose&gt;<br \/>\n      &lt;c:when test=&quot;${empty(insertion.photo)}&quot;&gt;-&lt;\/c:when&gt;<br \/>\n      &lt;c:otherwise&gt;&lt;img src=&quot;photos\/${insertion.photo}&quot; \/&gt;&lt;\/c:otherwise&gt;<br \/>\n    &lt;\/c:choose&gt;<br \/>\n  &lt;\/dd&gt;<br \/>\n  &lt;dt&gt;Descrizione&lt;\/dt&gt;<br \/>\n  &lt;dd&gt;${fn:escapeXml(insertion.description)}&lt;\/dd&gt;<br \/>\n&lt;\/dl&gt;<br \/>\n&lt;\/body&gt;<br \/>\n&lt;\/html&gt;[\/html]<br \/>\nQuesta pagina &#8220;chiude il giro&#8221;, mostrando i dettagli delle inserzioni il cui ID \u00e8 passato nella URL.<\/p>\n<h3>Linkografia<\/h3>\n<ul>\n<li><a title=\"Spring Reference - 15.3.2.1\" href=\"http:\/\/static.springsource.org\/spring\/docs\/3.0.x\/spring-framework-reference\/html\/mvc.html#mvc-ann-requestmapping-uri-templates\" target=\"_blank\" rel=\"noopener noreferrer\">URI templates<\/a><\/li>\n<li><a title=\"Representational State Transfer (REST)\" href=\"http:\/\/it.wikipedia.org\/wiki\/Representational_State_Transfer\" target=\"_blank\" rel=\"noopener noreferrer\">Representational State Transfer (REST)<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-6347\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2011\/02\/Logo_Spring_252x1501.png\" alt=\"\" width=\"142\" height=\"80\" style=\"margin-right:10px\" \/>Dopo esserci presi una &#8220;pausa di riflessione&#8221; nello <a href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-spring-nelle-web-application-parte-11\" target=\"_blank\" rel=\"noopener noreferrer\">scorso articolo<\/a>, riprendiamo con lo sviluppo dell&#8217;applicazione. In questo appuntamento realizzeremo la <strong>pagina di dettaglio di un&#8217;inserzione<\/strong>.<\/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":[194,172,173,143,215,169],"class_list":["post-7604","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-http","tag-java","tag-jsp","tag-mvc","tag-spring","tag-web-services"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 Utilizzare Spring nelle web application - parte 12 - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Utilizzare Spring nelle web application - parte 12. Contattaci per una partnership! 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