JFileChooser openFile = new JFileChooser();
            openFile.setCurrentDirectory(new File("."));
            FileFilter filter = new FileNameExtensionFilter("XML Documents (*.xml)", "xml");
            openFile.setFileFilter(filter);
            if (openFile.showDialog(openFile, null) == JFileChooser.APPROVE_OPTION) {
                try {
                    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
                    DocumentBuilder builder = factory.newDocumentBuilder();
                    Document document = (Document) builder.parse(openFile.getSelectedFile());
                    Element radacinaArboreDom = document.getDocumentElement();
                    DefaultMutableTreeNode defaultMutableTreeNode = new DefaultMutableTreeNode(
                            radacinaArboreDom.getNodeName());
                    DefaultTreeModel defaultTreeModel = new DefaultTreeModel(defaultMutableTreeNode);
                    tree.setModel(defaultTreeModel);
                    Procesare_XML.rec(radacinaArboreDom, defaultMutableTreeNode);
                } catch (Exception ex) {
                    JOptionPane.showMessageDialog(openFile, "Nu s-a ales nici un fiser");
                }
            }
        }