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--- swdev:java:component:jtree [2017/10/02 08:51]
smayr [Populating Tree]
+++ swdev:java:component:jtree [2017/10/08 11:25] (current)
smayr [File List in JTree]
@@ Line 59: / Line 59: @@
 Reference: [[https://stackoverflow.com/questions/15215578/how-to-build-a-jtree-dynamically]]
+== File List in Tree ==
+<code java>
+package com.ggl.testing;
+import java.io.File;
+import javax.swing.JFrame;
+import javax.swing.JScrollPane;
+import javax.swing.JTree;
+import javax.swing.SwingUtilities;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeModel;
+public class FileBrowser implements Runnable {
+    private DefaultMutableTreeNode root;
+    private DefaultTreeModel treeModel;
+    private JTree tree;
+    @Override
+    public void run() {
+        JFrame frame = new JFrame("File Browser");
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        File fileRoot = new File("C:/");
+        root = new DefaultMutableTreeNode(new FileNode(fileRoot));
+        treeModel = new DefaultTreeModel(root);
+        tree = new JTree(treeModel);
+        tree.setShowsRootHandles(true);
+        JScrollPane scrollPane = new JScrollPane(tree);
+        frame.add(scrollPane);
+        frame.setLocationByPlatform(true);
+        frame.setSize(640, 480);
+        frame.setVisible(true);
+        CreateChildNodes ccn =
+                new CreateChildNodes(fileRoot, root);
+        new Thread(ccn).start();
+    }
+    public static void main(String[] args) {
+        SwingUtilities.invokeLater(new FileBrowser());
+    }
+    public class CreateChildNodes implements Runnable {
+        private DefaultMutableTreeNode root;
+        private File fileRoot;
+        public CreateChildNodes(File fileRoot,
+                DefaultMutableTreeNode root) {
+            this.fileRoot = fileRoot;
+            this.root = root;
+        }
+        @Override
+        public void run() {
+            createChildren(fileRoot, root);
+        }
+        private void createChildren(File fileRoot,
+                DefaultMutableTreeNode node) {
+            File[] files = fileRoot.listFiles();
+            if (files == null) return;
+            for (File file : files) {
+                DefaultMutableTreeNode childNode =
+                        new DefaultMutableTreeNode(new FileNode(file));
+                node.add(childNode);
+                if (file.isDirectory()) {
+                    createChildren(file, childNode);
+                }
+            }
+        }
+    }
+    public class FileNode {
+        private File file;
+        public FileNode(File file) {
+            this.file = file;
+        }
+        @Override
+        public String toString() {
+            String name = file.getName();
+            if (name.equals("")) {
+                return file.getAbsolutePath();
+            } else {
+                return name;
+            }
+        }
+    }
+}
+</code>
+References: [[https://stackoverflow.com/questions/23804675/list-files-and-directories-with-jtree-and-file-in-java]]
+== File List in JTree ==
+<code java>
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import javax.swing.DefaultListModel;
+import javax.swing.JTree;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeModel;
+//...
+public class frmMain extends javax.swing.JFrame
+{
+    public frmMain()
+    {
+        initComponents();
+        LaunchWebView();
+        OpenXmlDataFile();
+        try {
+             treeFileList.setModel(new DefaultTreeModel(new DefaultMutableTreeNode("C:\\TEMP")));   // clear existing model
+             FileUtils.scanAndLoadDirectory("C:\\TEMP", treeFileList);
+        } catch (Exception exc) {
+           // Do something
+        }
+    }
+}
+</code>
+<code java>
+package com.acme.myapp;
+import java.io.File;
+import javax.swing.JTree;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeModel;
+public class FileUtils
+{
+    public static void scanAndLoadDirectory(String location, JTree tree) throws InterruptedException
+    {
+        // Creates a file with the location filename
+        //String location ="C:\\Users\\Ashish Padalkar\\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>