Mensaje de confirmacion al generarse el informe

src/danielcortes/xyz/controllers/InformesController.java

@@ -30,7 +30,9 @@ import danielcortes.xyz.views.InformesView;
 
 import javax.swing.*;
 import javax.swing.filechooser.FileNameExtensionFilter;
+import java.awt.*;
 import java.io.File;
+import java.io.IOException;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
 
@@ -55,13 +57,15 @@ public class InformesController {
         DateTimeFormatter formatter = DateTimeFormatter.ofPattern("MMMM YYYY");
         String formatedName = month.format(formatter);
         String capitalized = formatedName.substring(0, 1).toUpperCase() + formatedName.substring(1);
-        File saveFile = askForFile("Informe "+ capitalized);
+        File saveFile = askForFile("Informe " + capitalized);
         if (saveFile == null) {
             return;
         }
 
         InformeMensual informeMensual = new InformeMensual(month, saveFile);
-        informeMensual.generarInforme();
+        File generatedFile = informeMensual.generarInforme();
+
+        this.showConfirmation(generatedFile);
     }
 
     private LocalDate askForMonth() {
@@ -76,7 +80,7 @@ public class InformesController {
     private File askForFile(String suggestedName) {
         JFileChooser chooser = new JFileChooser();
         chooser.setDialogType(JFileChooser.SAVE_DIALOG);
-        chooser.setSelectedFile(new File(suggestedName+".xls"));
+        chooser.setSelectedFile(new File(suggestedName + ".xls"));
         chooser.setFileFilter(new FileNameExtensionFilter("Excel 2007", "xls"));
 
         if (chooser.showSaveDialog(this.view.getContentPanel()) == JFileChooser.APPROVE_OPTION) {
@@ -90,4 +94,22 @@ public class InformesController {
         }
     }
 
+    private void showConfirmation(File file) {
+        int result = JOptionPane.showConfirmDialog(
+                this.view.getContentPanel(),
+                "El informe se a generado\n" +
+                        "¿Desea abrirlo?",
+                "Confirmacion",
+                JOptionPane.YES_NO_OPTION,
+                JOptionPane.QUESTION_MESSAGE
+        );
+        if (result == 0) {
+            try {
+                Desktop.getDesktop().open(file);
+            } catch (IOException e) {
+                e.printStackTrace();
+            }
+
+        }
+    }
 }

src/danielcortes/xyz/informes/InformeMensual.java

@@ -133,16 +133,18 @@ public class InformeMensual {
         }
     }
 
-    public void generarInforme(){
+    public File generarInforme(){
         fillData();
         fillHeaders();
         setStyles();
 
         try (OutputStream fileOut = new FileOutputStream(this.saveFile)) {
             wb.write(fileOut);
+            return this.saveFile;
         } catch (IOException e) {
             e.printStackTrace();
         }
+        return null;
     }