【Java-GUI】10 Swing05 JTree
简单的Tree结构：
package cn.dzz; import javax.swing.*; import javax.swing.tree.DefaultMutableTreeNode; public class JTree { JFrame jFrame = new JFrame("简单树状"); public static void main(String[] args) { new JTree().init(); } private void init() { // 创建节点对象 DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("根节点"); DefaultMutableTreeNode firstLevelNode1 = new DefaultMutableTreeNode("一级节点1"); DefaultMutableTreeNode firstLevelNode2 = new DefaultMutableTreeNode("一级节点2"); DefaultMutableTreeNode firstLevelNode3 = new DefaultMutableTreeNode("一级节点3"); DefaultMutableTreeNode secondLevelNode1 = new DefaultMutableTreeNode("二级节点1"); DefaultMutableTreeNode secondLevelNode2 = new DefaultMutableTreeNode("二级节点2"); DefaultMutableTreeNode secondLevelNode3 = new DefaultMutableTreeNode("二级节点3"); DefaultMutableTreeNode secondLevelNode4 = new DefaultMutableTreeNode("二级节点4"); DefaultMutableTreeNode secondLevelNode5 = new DefaultMutableTreeNode("二级节点5"); DefaultMutableTreeNode secondLevelNode6 = new DefaultMutableTreeNode("二级节点6"); DefaultMutableTreeNode secondLevelNode7 = new DefaultMutableTreeNode("二级节点7"); DefaultMutableTreeNode secondLevelNode8 = new DefaultMutableTreeNode("二级节点8"); DefaultMutableTreeNode secondLevelNode9 = new DefaultMutableTreeNode("二级节点9"); // 按自定义的关系进行组装 rootNode.add(firstLevelNode1); rootNode.add(firstLevelNode2); rootNode.add(firstLevelNode3); firstLevelNode1.add(secondLevelNode1); firstLevelNode1.add(secondLevelNode2); firstLevelNode1.add(secondLevelNode3); firstLevelNode2.add(secondLevelNode4); firstLevelNode2.add(secondLevelNode5); firstLevelNode2.add(secondLevelNode6); firstLevelNode3.add(secondLevelNode7); firstLevelNode3.add(secondLevelNode8); firstLevelNode3.add(secondLevelNode9); // 创建JTree对象进行装填 javax.swing.JTree jTree = new javax.swing.JTree(rootNode); jFrame.add(jTree); jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 点击关闭按钮结束程序 jFrame.pack(); // 窗口自适应 jFrame.setVisible(true); } }
程序效果：
设置样式：
// 设置外观样式： jTree.putClientProperty("JTree.lineStyle", "None");
设置移除节点关系线
设置一级节点水平分割线：
// 设置外观样式： jTree.putClientProperty("JTree.lineStyle", "Horizontal");
对节点的操作控制：
package cn.dzz; import javax.swing.*; import javax.swing.tree.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class JTree { JFrame jFrame = new JFrame("简单树状"); // 创建节点对象 DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("根节点"); DefaultMutableTreeNode firstLevelNode1 = new DefaultMutableTreeNode("一级节点1"); DefaultMutableTreeNode firstLevelNode2 = new DefaultMutableTreeNode("一级节点2"); DefaultMutableTreeNode firstLevelNode3 = new DefaultMutableTreeNode("一级节点3"); DefaultMutableTreeNode secondLevelNode1 = new DefaultMutableTreeNode("二级节点1"); DefaultMutableTreeNode secondLevelNode2 = new DefaultMutableTreeNode("二级节点2"); DefaultMutableTreeNode secondLevelNode3 = new DefaultMutableTreeNode("二级节点3"); DefaultMutableTreeNode secondLevelNode4 = new DefaultMutableTreeNode("二级节点4"); DefaultMutableTreeNode secondLevelNode5 = new DefaultMutableTreeNode("二级节点5"); DefaultMutableTreeNode secondLevelNode6 = new DefaultMutableTreeNode("二级节点6"); DefaultMutableTreeNode secondLevelNode7 = new DefaultMutableTreeNode("二级节点7"); DefaultMutableTreeNode secondLevelNode8 = new DefaultMutableTreeNode("二级节点8"); DefaultMutableTreeNode secondLevelNode9 = new DefaultMutableTreeNode("二级节点9"); // 操作按钮 JButton btnForAddBrotherNode = new JButton("添加兄弟节点"); JButton btnForAddSubNode = new JButton("添加子节点"); JButton btnForDeleteThisNode = new JButton("删除此节点"); JButton btnForChangeThisNode = new JButton("更改此节点"); public static void main(String[] args) { new JTree().init(); } private void init() { // 按自定义的关系进行组装 rootNode.add(firstLevelNode1); rootNode.add(firstLevelNode2); rootNode.add(firstLevelNode3); firstLevelNode1.add(secondLevelNode1); firstLevelNode1.add(secondLevelNode2); firstLevelNode1.add(secondLevelNode3); firstLevelNode2.add(secondLevelNode4); firstLevelNode2.add(secondLevelNode5); firstLevelNode2.add(secondLevelNode6); firstLevelNode3.add(secondLevelNode7); firstLevelNode3.add(secondLevelNode8); firstLevelNode3.add(secondLevelNode9); // 创建JTree对象进行装填 javax.swing.JTree jTree = new javax.swing.JTree(rootNode); // 设置节点树可以被操作 jTree.setEditable(true); // 获取节点模型对象 DefaultTreeModel model = (DefaultTreeModel)jTree.getModel(); // 强制转换成实现类对象 DefaultTreeModel defaultTreeModel = (DefaultTreeModel)model; // 添加操作 btnForAddBrotherNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // 获取当前选中的节点 // 通过获取到的当前节点获取该节点的父节点 Object lastSelectedPathComponent = jTree.getLastSelectedPathComponent(); DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)lastSelectedPathComponent; if (selectedNode == null) { return; } // 创建一个新节点 TreeNode parent = selectedNode.getParent(); DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)parent; if (parentNode == null) { return; } // 把这个新节点交给父节点进行添加 DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新节点"); int selectedIndex = parentNode.getIndex(selectedNode); model.insertNodeInto(newNode, parentNode, selectedIndex); // 在节点树中显示这个节点 TreeNode[] pathToRoot = model.getPathToRoot(newNode); TreePath treePath = new TreePath(pathToRoot); jTree.scrollPathToVisible(treePath); // 重新绘制Tree节点 jTree.updateUI(); } }); btnForAddSubNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) jTree.getLastSelectedPathComponent(); DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新增的子节点"); selectedNode.add(newNode); TreeNode[] pathToRoot = model.getPathToRoot(newNode); TreePath treePath = new TreePath(pathToRoot); jTree.scrollPathToVisible(treePath); jTree.updateUI(); } }); btnForDeleteThisNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) jTree.getLastSelectedPathComponent(); if (selectedNode != null && selectedNode.getParent() != null) { model.removeNodeFromParent(selectedNode); } } }); btnForChangeThisNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // 获取当前选中的结点路径 TreePath selectionPath = jTree.getSelectionPath(); // 如果路径非空，则设置该路径的最后一个节点可以编辑 if (selectionPath != null) { jTree.startEditingAtPath(selectionPath); } } }); jFrame.add(new JScrollPane(jTree)); JPanel jPanel = new JPanel(); jPanel.add(btnForAddBrotherNode); jPanel.add(btnForAddSubNode); jPanel.add(btnForChangeThisNode); jPanel.add(btnForDeleteThisNode); jFrame.add(jPanel, BorderLayout.SOUTH); // jFrame.add(jTree); jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 点击关闭按钮结束程序 jFrame.pack(); // 窗口自适应 jFrame.setVisible(true); } }
程序效果：
设置节点树的选择模式，单选，多选等等，然后监听选中的节点设置的值：
package cn.dzz; import javax.swing.*; import javax.swing.event.TreeSelectionEvent; import javax.swing.event.TreeSelectionListener; import javax.swing.tree.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class JTree { JFrame jFrame = new JFrame("简单树状"); // 创建节点对象 DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("根节点"); DefaultMutableTreeNode firstLevelNode1 = new DefaultMutableTreeNode("一级节点1"); DefaultMutableTreeNode firstLevelNode2 = new DefaultMutableTreeNode("一级节点2"); DefaultMutableTreeNode firstLevelNode3 = new DefaultMutableTreeNode("一级节点3"); DefaultMutableTreeNode secondLevelNode1 = new DefaultMutableTreeNode("二级节点1"); DefaultMutableTreeNode secondLevelNode2 = new DefaultMutableTreeNode("二级节点2"); DefaultMutableTreeNode secondLevelNode3 = new DefaultMutableTreeNode("二级节点3"); DefaultMutableTreeNode secondLevelNode4 = new DefaultMutableTreeNode("二级节点4"); DefaultMutableTreeNode secondLevelNode5 = new DefaultMutableTreeNode("二级节点5"); DefaultMutableTreeNode secondLevelNode6 = new DefaultMutableTreeNode("二级节点6"); DefaultMutableTreeNode secondLevelNode7 = new DefaultMutableTreeNode("二级节点7"); DefaultMutableTreeNode secondLevelNode8 = new DefaultMutableTreeNode("二级节点8"); DefaultMutableTreeNode secondLevelNode9 = new DefaultMutableTreeNode("二级节点9"); // 操作按钮 JButton btnForAddBrotherNode = new JButton("添加兄弟节点"); JButton btnForAddSubNode = new JButton("添加子节点"); JButton btnForDeleteThisNode = new JButton("删除此节点"); JButton btnForChangeThisNode = new JButton("更改此节点"); // 文本框 JTextArea jTextArea = new JTextArea(5, 20); public static void main(String[] args) { new JTree().init(); } private void init() { // 按自定义的关系进行组装 rootNode.add(firstLevelNode1); rootNode.add(firstLevelNode2); rootNode.add(firstLevelNode3); firstLevelNode1.add(secondLevelNode1); firstLevelNode1.add(secondLevelNode2); firstLevelNode1.add(secondLevelNode3); firstLevelNode2.add(secondLevelNode4); firstLevelNode2.add(secondLevelNode5); firstLevelNode2.add(secondLevelNode6); firstLevelNode3.add(secondLevelNode7); firstLevelNode3.add(secondLevelNode8); firstLevelNode3.add(secondLevelNode9); // 创建JTree对象进行装填 javax.swing.JTree jTree = new javax.swing.JTree(rootNode); // 设置节点树可以被操作 jTree.setEditable(true); // 获取节点模型对象 DefaultTreeModel model = (DefaultTreeModel)jTree.getModel(); // 强制转换成实现类对象 DefaultTreeModel defaultTreeModel = (DefaultTreeModel)model; // 添加操作 btnForAddBrotherNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // 获取当前选中的节点 // 通过获取到的当前节点获取该节点的父节点 Object lastSelectedPathComponent = jTree.getLastSelectedPathComponent(); DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode)lastSelectedPathComponent; if (selectedNode == null) { return; } // 创建一个新节点 TreeNode parent = selectedNode.getParent(); DefaultMutableTreeNode parentNode = (DefaultMutableTreeNode)parent; if (parentNode == null) { return; } // 把这个新节点交给父节点进行添加 DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新节点"); int selectedIndex = parentNode.getIndex(selectedNode); model.insertNodeInto(newNode, parentNode, selectedIndex); // 在节点树中显示这个节点 TreeNode[] pathToRoot = model.getPathToRoot(newNode); TreePath treePath = new TreePath(pathToRoot); jTree.scrollPathToVisible(treePath); // 重新绘制Tree节点 jTree.updateUI(); } }); btnForAddSubNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) jTree.getLastSelectedPathComponent(); DefaultMutableTreeNode newNode = new DefaultMutableTreeNode("新增的子节点"); selectedNode.add(newNode); TreeNode[] pathToRoot = model.getPathToRoot(newNode); TreePath treePath = new TreePath(pathToRoot); jTree.scrollPathToVisible(treePath); jTree.updateUI(); } }); btnForDeleteThisNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { DefaultMutableTreeNode selectedNode = (DefaultMutableTreeNode) jTree.getLastSelectedPathComponent(); if (selectedNode != null && selectedNode.getParent() != null) { model.removeNodeFromParent(selectedNode); } } }); btnForChangeThisNode.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { // 获取当前选中的结点路径 TreePath selectionPath = jTree.getSelectionPath(); // 如果路径非空，则设置该路径的最后一个节点可以编辑 if (selectionPath != null) { jTree.startEditingAtPath(selectionPath); } } }); // 设置节点树的选择模式 TreeSelectionModel selectionModel = jTree.getSelectionModel(); selectionModel.setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION); // 设置监听的选择器 jTree.addTreeSelectionListener(new TreeSelectionListener() { @Override public void valueChanged(TreeSelectionEvent e) { TreePath newLeadSelectionPath = e.getNewLeadSelectionPath(); jTextArea.append(newLeadSelectionPath.toString() + "\n"); } }); Box horizontalBox = Box.createHorizontalBox(); horizontalBox.add(new JScrollPane(jTree)); horizontalBox.add(new JScrollPane(jTextArea)); jFrame.add(horizontalBox); JPanel jPanel = new JPanel(); jPanel.add(btnForAddBrotherNode); jPanel.add(btnForAddSubNode); jPanel.add(btnForChangeThisNode); jPanel.add(btnForDeleteThisNode); jFrame.add(jPanel, BorderLayout.SOUTH); // jFrame.add(jTree); jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 点击关闭按钮结束程序 jFrame.pack(); // 窗口自适应 jFrame.setVisible(true); } }
程序效果：
