{"id":5092,"date":"2010-11-02T19:09:27","date_gmt":"2010-11-02T18:09:27","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=5092"},"modified":"2023-02-27T14:53:32","modified_gmt":"2023-02-27T14:53:32","slug":"utilizzare-jasper-reports-sviluppo-di-una-web-application","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/utilizzare-jasper-reports-sviluppo-di-una-web-application\/","title":{"rendered":"Utilizzare Jasper Reports &#8211; Sviluppo di una web application"},"content":{"rendered":"<p>In questo articolo vedremo un esempio di integrazione di Jasper Reports con una semplice <em>web application<\/em>, scritta ovviamente in Java.<\/p>\n<h3>Modificare il progetto<\/h3>\n<p><img decoding=\"async\" class=\"alignleft size-full wp-image-4373\" title=\"Utilizzare Jasper Report\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/09\/jasper1.png\" alt=\"Utilizzare Jasper Report\" width=\"91\" height=\"87\" \/><a title=\"Creare report da Java\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-creare-report-da-java\" target=\"_blank\" rel=\"noopener noreferrer\">Nelle ultime due puntate<\/a> di questa serie abbiamo creato un progetto completo grazie all&#8217;utilizzo del plugin <em><a title=\"maven-archetype-plugin\" href=\"http:\/\/maven.apache.org\/archetype\/maven-archetype-plugin\/\" target=\"_blank\" rel=\"noopener noreferrer\">maven-archetype-plugin<\/a><\/em>. Il progetto creato per\u00f2 non ha la struttura di web application, dobbiamo quindi apportare delle modifiche.<\/p>\n<p>Per prima cosa dobbiamo modificare il file <strong>pom.xml<\/strong> (la configurazione di Maven): la voce <em><br \/>\n<\/em> deve essere modificata da <em>jar<\/em> (acronimo di <em>Java Archive<\/em>) a <em>war<\/em> (<em>Web Application Archive<\/em>):<\/p>\n<p>[java]&lt;packaging&gt;war&lt;\/packaging&gt;[\/java]<\/p>\n<p>Bisogna anche aggiungere le <em>dipendenze<\/em> relative alle <strong>servlet<\/strong> e <strong>JSP<\/strong> (<em>Java Server Pages<\/em>). Per farlo bisogna aggiungere queste righe all&#8217;interno dell&#8217;elemento :<\/p>\n<p>[java]&lt;dependency&gt;<br \/>\n  &lt;groupId&gt;javax.servlet&lt;\/groupId&gt;<br \/>\n  &lt;artifactId&gt;servlet-api&lt;\/artifactId&gt;<br \/>\n  &lt;version&gt;2.3&lt;\/version&gt;<br \/>\n  &lt;scope&gt;provided&lt;\/scope&gt;<br \/>\n&lt;\/dependency&gt;<\/p>\n<p>&lt;dependency&gt;<br \/>\n  &lt;groupId&gt;javax.servlet.jsp&lt;\/groupId&gt;<br \/>\n  &lt;artifactId&gt;jsp-api&lt;\/artifactId&gt;<br \/>\n  &lt;version&gt;2.0&lt;\/version&gt;<br \/>\n  &lt;scope&gt;provided&lt;\/scope&gt;<br \/>\n&lt;\/dependency&gt;[\/java]<\/p>\n<p>Creare quindi le directory:<\/p>\n<p><em>src\/main\/webapp\/WEB-INF<\/em><\/p>\n<p>e, all&#8217;interno di <em>WEB-INF<\/em>, il file <em>web.xml<\/em>, con questi contenuti:<\/p>\n<p>[java]&lt;!DOCTYPE web-app PUBLIC<br \/>\n &quot;-\/\/Sun Microsystems, Inc.\/\/DTD Web Application 2.3\/\/EN&quot;<br \/>\n &quot;http:\/\/java.sun.com\/dtd\/web-app_2_3.dtd&quot; &gt;<\/p>\n<p>&lt;web-app&gt;<br \/>\n  &lt;display-name&gt;Tutorial Jasper Reports &#8211; Artera.it&lt;\/display-name&gt;<br \/>\n&lt;\/web-app&gt;[\/java]<\/p>\n<h3>L&#8217;applicazione<\/h3>\n<p>Per il momento ci accontentiamo di una struttura molto semplice che utilizza una pagina HTML e una servlet, ma sappiate che un&#8217;applicazione reale avr\u00e0 bisogno di un&#8217;organizzazione ben pi\u00f9 strutturata, per poter gestire agevolmente molte maschere di inserimento dati, flussi di lavoro complessi, gestione degli errori, ecc.<\/p>\n<p>Creiamo quindi la pagina HTML:<\/p>\n<p><em>src\/main\/webapp\/index.html<\/em><\/p>\n<p>con questi contenuti:<\/p>\n<p>[java]&lt;html&gt;<br \/>\n&lt;body&gt;<br \/>\n&lt;h1&gt;Jasper Reports Tutorial&lt;\/h1&gt;<br \/>\n&lt;a href=&quot;servlet\/reportServlet&quot;&gt;Esegui Report&lt;\/a&gt;<br \/>\n&lt;\/body&gt;<br \/>\n&lt;\/html&gt;[\/java]<\/p>\n<p>Creiamo quindi la classe <em>ReportServlet<\/em> nel package <em>it.artera.jr<\/em>:<\/p>\n<p>[java]package it.artera.jr;<\/p>\n<p>import java.io.*;<br \/>\nimport java.util.*;<\/p>\n<p>import javax.servlet.ServletException;<br \/>\nimport javax.servlet.http.*;<\/p>\n<p>import net.sf.jasperreports.engine.*;<br \/>\nimport net.sf.jasperreports.engine.data.JRMapCollectionDataSource;<\/p>\n<p>public class ReportServlet extends HttpServlet {<br \/>\n    @Override<br \/>\n    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {<\/p>\n<p>        \/\/ indica al client il tipo di contenuto<br \/>\n        resp.setContentType(&quot;application\/pdf&quot;);<\/p>\n<p>        \/\/ carica il report compilato<br \/>\n        InputStream is = getClass().getResourceAsStream(&quot;\/testReport.jasper&quot;);<\/p>\n<p>        \/\/ crea una java.util.Collection contenente dei dati<br \/>\n        Collection data = createSampleData();<br \/>\n        \/\/ la avvolge in un&#8217;implementazione di JRDataSource<br \/>\n        JRMapCollectionDataSource dataSource = new JRMapCollectionDataSource(data);<\/p>\n<p>        try {<br \/>\n            JasperRunManager.runReportToPdfStream(is, resp.getOutputStream(), null, dataSource);<br \/>\n        } catch (JRException jrex) {<br \/>\n            throw new ServletException(&quot;Errore generando il report&quot;, jrex);<br \/>\n        }<br \/>\n    }<\/p>\n<p>    private Collection createSampleData() {<br \/>\n        Map row;<br \/>\n        Collection data = new ArrayList();<\/p>\n<p>        row = new HashMap();<br \/>\n        row.put(&quot;name&quot;, &quot;Lorem&quot;);<br \/>\n        data.add(row);<\/p>\n<p>        row = new HashMap();<br \/>\n        row.put(&quot;name&quot;, &quot;Ipsum&quot;);<br \/>\n        data.add(row);<\/p>\n<p>        row = new HashMap();<br \/>\n        row.put(&quot;name&quot;, &quot;Docet&quot;);<br \/>\n        data.add(row);<\/p>\n<p>        return data;<br \/>\n    }<br \/>\n}[\/java]<\/p>\n<p>Il codice di del metodo <em>doGet()<\/em> \u00e8 in larga parte copiato dalla classe <em>App<\/em>, con l&#8217;unica differenza che l&#8217;output non viene salvato su disco ma viene rediretto sull&#8217;output stream della servlet.<\/p>\n<p>L&#8217;ultimo passo \u00e8 la mappatura della servlet in web.xml, per farlo bisogna aggiungere queste righe all&#8217;interno di <em>web.xml<\/em>, prima del tag di chiusura <em> <\/em>:<\/p>\n<p>[java]&lt;servlet&gt;<br \/>\n  &lt;servlet-name&gt;reportServlet&lt;\/servlet-name&gt;<br \/>\n  &lt;servlet-class&gt;it.artera.jr.ReportServlet&lt;\/servlet-class&gt;<br \/>\n&lt;\/servlet&gt;<\/p>\n<p>&lt;servlet-mapping&gt;<br \/>\n  &lt;servlet-name&gt;reportServlet&lt;\/servlet-name&gt;<br \/>\n  &lt;url-pattern&gt;\/servlet\/reportServlet&lt;\/url-pattern&gt;<br \/>\n&lt;\/servlet-mapping&gt;[\/java]<\/p>\n<h3>Deploy &amp; test<\/h3>\n<p>Per testare subito la vostra applicazione dovete prima preparare il pacchetto, con il comando:<\/p>\n<pre>mvn package<\/pre>\n<p>il risultato del build \u00e8 il file<\/p>\n<p>target\/[NOME APPLICAZIONE].war<\/p>\n<p>Rinominate questo file come jasper_tutorial.war e copiatelo nella directory webapps di Tomcat; fate partire il server, e poi andate all&#8217;indirizzo <code><a href=\"http:\/\/localhost:8080\/jasper_tutorial\">http:\/\/localhost:8080\/jasper_tutorial<\/a><\/code>, dove troverete la pagina iniziale con il link, cliccando sul quale otterrete il report in PDF.<\/p>\n<h3>Sviluppi<\/h3>\n<p>Ci sono molti modi per servire report tramite web application, noi abbiamo visto una caso molto semplice. Nelle applicazioni reali ci sono sicuramente molte pi\u00f9 variabili in gioco: passaggio di parametri, diversi tipi di output, e soprattutto l&#8217;utilizzo di ciclo di sviluppo\/deploy\/debug molto pi\u00f9 comodo e veloce.<\/p>\n<h3>Linkografia<\/h3>\n<ul>\n<li><a title=\"Integrazione con maven\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-integrazione-con-maven\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Utilizzare jasper reports \u2013 Integrazione con maven<\/em><\/a><em>;<\/em><\/li>\n<li><a title=\"Creare report da Java\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-creare-report-da-java\" target=\"_blank\" rel=\"noopener noreferrer\"><em>Utilizzare jasper reports \u2013 Creare report da Java<\/em><\/a><em>.<\/em><\/li>\n<\/ul>\n<p>La serie di articoli su Jasper Reports termina qui, speriamo vi sia stata utile. Se volete proseguire con approfondimenti su Jasper Reports, Maven, Java o qualsiasi altro argomento&#8230; fatevi sentire!<\/p>\n<p>Alla prossima,<\/p>\n<p>Dimitri<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-4373\" title=\"Utilizzare Jasper Report\" src=\"https:\/\/www.artera.net\/wp-content\/uploads\/2010\/09\/jasper1.png\" alt=\"Utilizzare Jasper Report\" width=\"91\" height=\"87\" \/>In questo articolo vedremo un esempio di integrazione di Jasper Reports con una semplice <em>web application<\/em>, scritta ovviamente in Java.<br \/>\n<a title=\"Creare report da Java\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-creare-report-da-java\" target=\"_blank\" rel=\"noopener noreferrer\">Nelle ultime due puntate<\/a> di questa serie abbiamo creato un progetto completo grazie all&#8217;utilizzo del plugin <em><a title=\"maven-archetype-plugin\" href=\"http:\/\/maven.apache.org\/archetype\/maven-archetype-plugin\/\" target=\"_blank\" rel=\"noopener noreferrer\">maven-archetype-plugin<\/a><\/em>. Il progetto creato per\u00f2 non ha la struttura di web application, dobbiamo quindi apportare delle modifiche.<\/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":[172,173,181,174,175],"class_list":["post-5092","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-java","tag-jsp","tag-report","tag-servlet","tag-tomcat"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u2022 Utilizzare Jasper Reports - Sviluppo di una web application - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Utilizzare Jasper Reports - Sviluppo di una web application. Contattaci per una partnership! 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