{"id":5000,"date":"2010-10-26T15:04:16","date_gmt":"2010-10-26T13:04:16","guid":{"rendered":"https:\/\/www.artera.net\/it\/blog\/?p=5000"},"modified":"2023-02-27T14:53:36","modified_gmt":"2023-02-27T14:53:36","slug":"utilizzare-jasper-reports-creare-report-da-java","status":"publish","type":"post","link":"https:\/\/www.artera.net\/it\/sviluppo\/utilizzare-jasper-reports-creare-report-da-java\/","title":{"rendered":"Utilizzare Jasper Reports &#8211; Creare report da Java"},"content":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-4373\" style=\"margin-top:5px; margin-right: 5px;\" 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 href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-integrazione-con-maven\" target=\"_blank\" rel=\"noopener noreferrer\">Nella scorsa puntata<\/a> con l&#8217;aiuto di Maven abbiamo creato la struttura di base di un progetto Java, pre-configurato con le librerie necessarie a Jasper Reports e gli automatismi necessari per compilare i report. In questo appuntamento vedremo quindi come <strong>creare i report direttamente dal nostro codice Java<\/strong>.<\/p>\n<h3>Il codice Java<\/h3>\n<p>Per vedere in azione la compilazione avevamo creato il report <em>src\/main\/jasperreports\/testReport.jrxml<\/em>, che veniva compilato in <em>target\/classes\/testReport.jasper<\/em>. Ricordiamo che <strong>i file con estensione .jasper sono dei file binari<\/strong> (ecco perch\u00e9 devono essere compilati), <strong>pronti per essere eseguiti<\/strong>; il termine <em>compilazione<\/em> \u00e8 usato proprio per questo motivo!<\/p>\n<p>La generazione automatica del progetto dovrebbe aver creato una classe <em>App<\/em> nella directory <em>src\/main\/java\/it\/artera\/jr\/App.java<\/em>, e il relativo test <a href=\"http:\/\/www.junit.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">JUnit<\/a> <em>AppTest<\/em> in <em>src\/test\/java\/it\/artera\/jr\/AppTest.java<\/em>. Maven infatti promuove appieno le pratiche di sviluppo <em>Agile<\/em>, ad esempio il <em><a title=\"Pagina di Wikipedia\" href=\"http:\/\/en.wikipedia.org\/wiki\/Test-driven_development\" target=\"_blank\" rel=\"noopener noreferrer\">Test-Driven Development<\/a><\/em> (<em>TDD<\/em>), che prevede che vengano scritti prima i test e poi il codice che li fa andare a buon fine. Per questo motivo la fase di test ha un ruolo importante nel ciclo di compilazione-packaging-deploy.<\/p>\n<p>Scriviamo dunque il nostro primo test; aggiungiamo il seguente metodo all&#8217;interno della classe <em>AppTest<\/em>:<\/p>\n<p>[java]public void test_sampleReport() throws Exception {<br \/>\n    \/\/ crea l&#8217;istanza di App<br \/>\n    App app = new App();<br \/>\n    \/\/ esegui il report<br \/>\n    app.sampleReport(&quot;target\/test\/testReport.pdf&quot;);<br \/>\n    \/\/ controlla che venga scritto il file di output<br \/>\n    assertTrue(new File(&quot;target\/test\/testReport.pdf&quot;).exists());<br \/>\n}[\/java]<\/p>\n<p>Il comando<\/p>\n<p>[java]mvn test[\/java]<\/p>\n<p>compila i file modificati ed eseguire tutti i test. Se proviamo a lanciarlo, otteniamo un errore:<\/p>\n<p>[java]&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<br \/>\n T E S T S<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<br \/>\nRunning it.artera.jr.AppTest<br \/>\nTests run: 1, Failures: 0, Errors: 1, Skipped: 0, Time elapsed: 0.028 sec &amp;lt;&amp;lt;&amp;lt; FAILURE!<\/p>\n<p>Results :<\/p>\n<p>Tests in error:<br \/>\n  test_sampleReport(it.artera.jr.AppTest)<\/p>\n<p>Tests run: 1, Failures: 0, Errors: 1, Skipped: 0&lt;\/pre&gt;<br \/>\nLa classe &lt;em&gt;App&lt;\/em&gt; infatti non ha un metodo &lt;em&gt;sampleReport()&lt;\/em&gt;. Modifichiamo quindi &lt;em&gt;App&lt;\/em&gt; in questo modo:<br \/>\n&lt;pre&gt;package it.artera.jr;<\/p>\n<p>import java.io.File;<br \/>\nimport java.io.FileOutputStream;<br \/>\nimport java.io.InputStream;<br \/>\nimport java.io.OutputStream;<br \/>\nimport java.util.ArrayList;<br \/>\nimport java.util.Collection;<br \/>\nimport java.util.HashMap;<br \/>\nimport java.util.Map;<\/p>\n<p>import net.sf.jasperreports.engine.JasperRunManager;<br \/>\nimport net.sf.jasperreports.engine.data.JRMapCollectionDataSource;<\/p>\n<p>\/**<br \/>\n * Hello world!<br \/>\n *<br \/>\n *\/<br \/>\npublic class App {<\/p>\n<p>    public void sampleReport(String outputDir) throws Exception {<br \/>\n        \/\/ carica il report compilato<br \/>\n        InputStream is = getClass().getResourceAsStream(&quot;\/testReport.jasper&quot;);<\/p>\n<p>        \/\/ imposta directory e file di output<br \/>\n        File outDir = new File(outputDir);<br \/>\n        outDir.mkdirs();<br \/>\n        OutputStream os = new FileOutputStream(new File(outDir, &quot;testReport.pdf&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>        JasperRunManager.runReportToPdfStream(is, os, null, dataSource);<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>Vi ricordate il report di prova? Aveva solamente un campo chiamato <em>name<\/em>. Nel codice qui sopra vediamo come <strong>ai report Jasper sia possibile passare una qualsiasi collezione di dati<\/strong>, purch\u00e9 correttamente inizializzata, ed essi verranno correttamente formattati <strong>senza doversi preoccupare della loro provenienza<\/strong>!<br \/>\nIn questo caso la <em>Collection<\/em> fornita dal metodo <em>createSampleData()<\/em> viene avvolta (wrapped) in un oggetto <em>JRMapCollectionDataSource<\/em>; questa classe implementa l&#8217;interfaccia <em>net.sf.jasperreports.engine.JRDataSource<\/em>, il cui scopo \u00e8 fare da tramite fra i report e i dati. Molto comodo!<\/p>\n<p>Rilanciamo il comando<\/p>\n<p>[java]mvn test[\/java]<\/p>\n<p>A questo punto otterremo una schermata simile a questa:<\/p>\n<p>[java]&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<br \/>\n T E S T S<br \/>\n&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;-<br \/>\nRunning it.artera.jr.AppTest<br \/>\nTests run: 1, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.812 sec<\/p>\n<p>Results :<\/p>\n<p>Tests run: 1, Failures: 0, Errors: 0, Skipped: 0<\/p>\n<p>[INFO] &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<br \/>\n[INFO] BUILD SUCCESSFUL<br \/>\n[INFO] &#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;&#8212;<br \/>\n[\/java]<\/p>\n<h3>Il report<\/h3>\n<p>Andando a controllare nella directory <em>target\/test<\/em> scopriamo che c&#8217;\u00e8 un file <em>testReport.pdf<\/em>: il nostro primo report!<\/p>\n<h3>Linkografia<\/h3>\n<ul>\n<li><a title=\"Articolo precedente\" href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-integrazione-con-maven\" target=\"_blank\" rel=\"noopener noreferrer\">Utilizzare jasper reports \u2013 integrazione con maven<\/a>;<\/li>\n<li><a href=\"http:\/\/www.junit.org\/\" target=\"_blank\" rel=\"noopener noreferrer\">JUnit<\/a>;<\/li>\n<li><a title=\"Pagina di Wikipedia\" href=\"http:\/\/en.wikipedia.org\/wiki\/Test-driven_development\" target=\"_blank\" rel=\"noopener noreferrer\">Test-Driven Development<\/a>.<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" class=\"alignleft size-full wp-image-4373\" style=\"margin-top:5px; margin-right: 5px;\" 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 href=\"https:\/\/www.artera.net\/it\/blog\/programmazione\/utilizzare-jasper-reports-integrazione-con-maven\" target=\"_blank\" rel=\"noopener noreferrer\">Nella scorsa puntata<\/a> con l&#8217;aiuto di Maven abbiamo creato la struttura di base di un progetto Java, pre-configurato con le librerie necessarie a Jasper Reports e gli automatismi necessari per compilare i report. In questo appuntamento vedremo quindi come <strong>creare i report direttamente dal nostro codice Java<\/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":[172,199,198,181,200],"class_list":["post-5000","post","type-post","status-publish","format-standard","hentry","category-sviluppo","tag-java","tag-junit","tag-maven","tag-report","tag-test"],"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 - Creare report da Java - Artera<\/title>\n<meta name=\"description\" content=\"Leggi dal blog: Utilizzare Jasper Reports - Creare report da Java. Contattaci per una partnership! 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