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--- swdev:java:files:file_routines [2017/09/29 16:45]
smayr
+++ swdev:java:files:file_routines [2018/03/12 08:16] (current)
smayr
@@ Line 47: / Line 47: @@
 References:
   * [[https://stackoverflow.com/questions/1844688/read-all-files-in-a-folder]]
+=== Method 4 ===
+<code java>
+    private void mnuOpenActionPerformed(java.awt.event.ActionEvent evt) {
+        try {
+            // Read text file
+            Path pth = Paths.get(System.getProperty("user.dir") + "/src/com/acme/myproj/data/", "customer.txt");
+            Stream<String> data = Files.lines(pth);
+            List<String> asList = data.collect(Collectors.toList());
+            System.out.println("Working Directory = " + System.getProperty("user.dir"));
+            System.out.println(asList);
+            DefaultListModel<String> lst = new DefaultListModel();
+            //for(int i=0; i< asList.size(); i++) {
+            //    String str = asList.get(i);
+            //    lst.addElement(str);
+            //}
+            for(String str: asList) {
+                lst.addElement(str);
+            }
+            lstAdminRegions.setModel(lst);
+        } catch (IOException ex) {
+            Logger.getLogger(frmMain.class.getName()).log(Level.SEVERE, null, ex);
+        }
+    }
+</code>
+== Example ==
+<code java>
+/*
+ * To change this license header, choose License Headers in Project Properties.
+ * To change this template file, choose Tools | Templates
+ * and open the template in the editor.
+ */
+package com.voirtech.sdayearbook;
+import java.io.File;
+import javax.swing.JTree;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeModel;
+/**
+ *
+ * @author mayr
+ */
+public class FileUtils
+{
+    /*
+     * Usage:
+        try {
+            treeOrgTypes.setModel(new DefaultTreeModel(new DefaultMutableTreeNode("C:\\WAMP")));  // clear existing model
+            FileUtils.scanAndLoadDirectory("C:\\WAMP", treeOrgTypes);
+        } catch (Exception exc) {
+          // Handle exception
+        }
+     */
+    public static void scanAndLoadDirectory(String location, JTree tree) throws InterruptedException
+    {
+        // Creates a file with the location filename
+        //String location ="C:\\Users\\John Doe\\Documents";
+        File currentDir = new File(location);
+        // Get root of tree model
+        DefaultTreeModel modelTree  = (DefaultTreeModel)tree.getModel();
+        DefaultMutableTreeNode root = (DefaultMutableTreeNode) modelTree.getRoot();
+        displayDirectoryContents(currentDir, modelTree, root);
+    }
+    public static void displayDirectoryContents(File dir, DefaultTreeModel model, DefaultMutableTreeNode curRoot) throws InterruptedException
+    {
+        File[] files = dir.listFiles();  // Creates array of file type for all the files found
+        for (File file : files) {
+            if (file == null) {
+                System.out.println("NULL directory found");
+                continue;
+            }
+            if (file.isDirectory()) {
+                //---------------------------
+                // File is a Directory
+                //---------------------------
+               if (file.listFiles() == null) {
+                    // Skip null files
+                    continue;
+                }
+                // Adds a new Directory node to tree root
+                DefaultMutableTreeNode newdir = new DefaultMutableTreeNode(file.getName());
+                curRoot.add(newdir);
+                // Refresh the model to show changes
+                model.reload();
+                // Recursively calls the function again to explore the contents folder
+                displayDirectoryContents(file, model, newdir);
+            } else {
+                //---------------------------
+                // File is not a directory
+                //---------------------------
+                // Inserts a node newfile under selected node which is the root
+                DefaultMutableTreeNode selectednode = curRoot;
+                DefaultMutableTreeNode newfile = new DefaultMutableTreeNode(file.getName());
+                model.insertNodeInto(newfile, selectednode, selectednode.getChildCount());
+                // Refresh the model to show the changes
+                model.reload();
+            }
+        }
+    }
+}
+</code>