Jtree节点实现高亮功能

本文主要是介绍Jtree节点实现高亮功能，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

JTexArea实现文本高亮（不是选中）比较容易也做过，但JTree怎么弄还真没弄过，今天研究了一下，在sun论坛里提问得到了答案，整理一下，共享之。国内还没有发现相关的资料。

package test; import java.awt.*; import java.util.*; import javax.swing.*; import javax.swing.event.*; import javax.swing.tree.*; public class HighlightTreeNodeTest { private final JTree tree = new JTree(); private final JTextField field = new JTextField("foo"); private final MyTreeCellRenderer renderer = new MyTreeCellRenderer(tree.getCellRenderer()); public JComponent makeUI() { field.getDocument().addDocumentListener(new DocumentListener() { public void insertUpdate(DocumentEvent e) { search(); } public void removeUpdate(DocumentEvent e) { search(); } public void changedUpdate(DocumentEvent e) { search(); } }); tree.setCellRenderer(renderer); renderer.key = field.getText(); JPanel p = new JPanel(new BorderLayout(5, 5)); p.setBorder(BorderFactory.createEmptyBorder(5, 5, 5, 5)); p.add(field, BorderLayout.NORTH); p.add(new JScrollPane(tree)); return p; } private void search() { String key = field.getText(); renderer.key = key; collapseAll(); if (key.isEmpty()) return; DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel().getRoot(); Enumeration nodes = root.breadthFirstEnumeration(); while (nodes.hasMoreElements()) { DefaultMutableTreeNode node = (DefaultMutableTreeNode) nodes.nextElement(); DefaultMutableTreeNode parent = (DefaultMutableTreeNode) node.getParent(); if (node.getUserObject().toString().toLowerCase().startsWith(key.toLowerCase())) if (parent!=null) tree.expandPath(new TreePath(parent.getPath())); } tree.repaint(); } /** * collapse all nodes */ private void collapseAll() { DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel().getRoot(); Enumeration nodes = root.breadthFirstEnumeration(); while (nodes.hasMoreElements()) { DefaultMutableTreeNode node = (DefaultMutableTreeNode) nodes.nextElement(); if (!node.isLeaf()) tree.collapsePath(new TreePath(node.getPath())); } } public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { createAndShowGUI(); } }); } public static void createAndShowGUI() { JFrame f = new JFrame(); f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE); f.getContentPane().add(new HighlightTreeNodeTest().makeUI()); f.setSize(320, 240); f.setLocationRelativeTo(null); f.setVisible(true); } } class MyTreeCellRenderer extends DefaultTreeCellRenderer { private final TreeCellRenderer renderer; public String key; public MyTreeCellRenderer(TreeCellRenderer renderer) { this.renderer = renderer; } @Override public Component getTreeCellRendererComponent( JTree tree, Object value, boolean isSelected, boolean expanded, boolean leaf, int row, boolean hasFocus) { JComponent c = (JComponent) renderer.getTreeCellRendererComponent( tree, value, isSelected, expanded, leaf, row, hasFocus); if (isSelected) { c.setOpaque(false); c.setForeground(getTextSelectionColor()); } else { c.setOpaque(true); if (key!=null && !key.isEmpty() && value.toString().toLowerCase().startsWith(key.toLowerCase())) { c.setForeground(getTextNonSelectionColor()); c.setBackground(Color.YELLOW); } else { c.setForeground(getTextNonSelectionColor()); c.setBackground(getBackgroundNonSelectionColor()); } } return c; } }

运行效果：