先上图，看看是不是你们想要的类似效果：
鼠标移动到树节点所在行的任意位置，实现高亮。
鼠标点击到树节点所在行的任意位置，实现高亮并选中该节点。
网上找了好久都没找到这样的实现方法，可能是swing 现在用的人太少了。
在这里希望能为想要用swing JTree的朋友提供一点参考。
下面是我的我的JTree 类的完整代码，里面有一些数据逻辑是我系统中的，所以你们只需要参考就行，不要完全复制
package cn.tz.cj.ui;
import cn.tz.cj.bo.Auth;
import cn.tz.cj.entity.NoteBook;
import cn.tz.cj.service.NoteBookService;
import cn.tz.cj.service.NoteService;
import cn.tz.cj.service.intf.INoteBookService;
import cn.tz.cj.service.intf.INoteService;
import javax.swing.*;
import javax.swing.tree.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Collections;
import java.util.Enumeration;
import java.util.List;
import java.util.Set;
public class NoteBookTree extends JTree {
private static final String ROOTNODE_NAME = "NoteBooks";
private static final Color SELECTED_BACKGROUD = new Color(115, 115, 115);
private static final Color MOUSE_BACKGROUD = new Color(222, 222, 222);
private static final int TREENODE_HIGH_LINE = 30;
private INoteBookService noteBookService = new NoteBookService();
private INoteService noteService = new NoteService();
private MainForm mainForm;
private int mouseRow;
public NoteBookTree(MainForm mainForm) {
this.mainForm = mainForm;
init();
}
private void init() {
// 数据加载
refresh(null, null, null);
// 事件绑定
bindEvent();
// 树样式渲染
this.setCellRenderer(new MyTreeCellRenderer());
this.addFocusListener(fl);
this.setOpaque(false);
this.setRowHeight(TREENODE_HIGH_LINE);
this.setRootVisible(false);
this.setShowsRootHandles(true);
}
public void refresh(String key, String lastSelectedNotebook, String lastSelectedNote) {
loadTree(key, lastSelectedNotebook, lastSelectedNote);
findInTree();// 设置自动选中
mainForm.refreshNoteTools(); // 主页右边内容匹配显示
}
private void loadTree(String key, String lastSelectedNotebook, String lastSelectedNote) {
Auth.getInstance().setSearchKey(key);
Auth.getInstance().setSelectedNoteBookName(lastSelectedNotebook);
Auth.getInstance().setSelectedNoteName(lastSelectedNote);
DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode(ROOTNODE_NAME);
List<NoteBook> noteBooks = noteBookService.getNoteBooks();
Collections.sort(noteBooks);
if (key == null || key.trim().equals("")) {
for (NoteBook nb : noteBooks) {
String notebook = nb.getNotebook();
DefaultMutableTreeNode notebookNode = new DefaultMutableTreeNode(notebook);
Set<String> notesTitlesByNoteBook = noteService.getNotesTitlesByNoteBook(notebook);
for (String title : notesTitlesByNoteBook) {
DefaultMutableTreeNode noteNode = new DefaultMutableTreeNode(title);
notebookNode.add(noteNode);
}
rootNode.add(notebookNode);
}
} else {
boolean isRecordFirstSelected = false;
for (NoteBook nb : noteBooks) {
String notebook = nb.getNotebook();
DefaultMutableTreeNode notebookNode = new DefaultMutableTreeNode(notebook);
Set<String> notesTitlesByNoteBook = noteService.getNotesTitlesByNoteBook(notebook);
boolean match = false;
for (String title : notesTitlesByNoteBook) {
String a = title.toLowerCase();
String b = key.toLowerCase();
if (a.contains(b)) {
DefaultMutableTreeNode noteNode = new DefaultMutableTreeNode(title);
if (!isRecordFirstSelected) {
if (lastSelectedNote == null && lastSelectedNotebook == null) {
Auth.getInstance().setSelectedNoteBookName(notebook);
Auth.getInstance().setSelectedNoteName(title);
}
isRecordFirstSelected = true;
}
notebookNode.add(noteNode);
match = true;
}
}
if (match || notebook.toLowerCase().contains(key.toLowerCase())) {
rootNode.add(notebookNode);
}
}
}
TreeModel treeModel = new DefaultTreeModel(rootNode);
this.setModel(treeModel);
if (key != null && !key.trim().equals("")) {
expandAll(this, new TreePath(rootNode), true);
}
}
private void bindEvent() {
this.addMouseListener(new MouseAdapter() {
@Override
public void mousePressed(MouseEvent e) {
int y = (int) e.getPoint().getY();
TreePath selPath = getPathForRow(matchRow(y));
setSelected(selPath);
if (e.getButton() == e.BUTTON3) {
if (selPath != null) {
int level = selPath.getPathCount();
String sel = selPath.getLastPathComponent().toString();
if (level == 2) {
noteBookMenu(sel).show(e.getComponent(), e.getX(), e.getY());//弹出右键菜单
} else if (level == 3) {
Object[] path = selPath.getPath();
noteMenu(path[1].toString(), sel).show(e.getComponent(), e.getX(), e.getY());//弹出右键菜单
}
}
} else if (e.getButton() == e.BUTTON1) {
mouseClickSelected(selPath);
}
}
});
this.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent arg0) {
int y = (int) arg0.getPoint().getY();
mouseRow = matchRow(y);
NoteBookTree.this.repaint();
}
});
}
private void mouseClickSelected(TreePath selPath) {
if (selPath != null) {
// mainForm.getEditor().autoSave();
int level = selPath.getPathCount();
Object[] path = selPath.getPath();
switch (level) {
case 2:
Auth.getInstance().setSelectedNoteBookName(path[1].toString());
Auth.getInstance().setSelectedNoteName(null);
break;
case 3:
Auth.getInstance().setSelectedNoteBookName(path[1].toString());
Auth.getInstance().setSelectedNoteName(path[2].toString());
break;
}
if (this.isExpanded(selPath)) {
this.collapsePath(selPath);
} else {
this.expandPath(selPath);
}
mainForm.refreshNoteTools();
}
}
private int matchRow(int y) {
int r = -1;
for (int i = 0; i < this.getRowCount(); i++) {
Rectangle rowBounds = this.getRowBounds(i);
int y1 = (int) rowBounds.getY();
int y2 = TREENODE_HIGH_LINE + (int) rowBounds.getY();
if (y >= y1 && y <= y2) {
r = i;
break;
}
}
return r;
}
private JPopupMenu treeMenu() {
JPopupMenu treeJPopupMenu = new JPopupMenu();
JMenuItem jMenuItem_addNotebook = new JMenuItem("新建笔记本");
jMenuItem_addNotebook.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
mainForm.getMouseLoading().startLoading();
onAddNotebook();
mainForm.getMouseLoading().stopLoading();
}
});
treeJPopupMenu.add(jMenuItem_addNotebook);
return treeJPopupMenu;
}
private JPopupMenu noteBookMenu(String notebookName) {
JPopupMenu treeJPopupMenu = new JPopupMenu();
JMenuItem jMenuItem_addNote = new JMenuItem("新建笔记");
jMenuItem_addNote.setIcon(ImageIconMananger.NOTE.getImageIcon20_20());
jMenuItem_addNote.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
onAddNote(notebookName);
}
});
JMenuItem jMenuItem_rename = new JMenuItem("重命名");
jMenuItem_rename.setIcon(ImageIconMananger.RENAME.getImageIcon20_20());
jMenuItem_rename.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
mainForm.getMouseLoading().startLoading();
String newName = (String) JOptionPane.showInputDialog(null, "", "请输入笔记本的名称",
JOptionPane.QUESTION_MESSAGE, null, null, notebookName);
if(!newName.equals(notebookName)){
noteBookService.rename(notebookName, newName);
refresh(null, null, null);
}
mainForm.getMouseLoading().stopLoading();
}
});
JMenuItem jMenuItem_remove = new JMenuItem("删除笔记本");
jMenuItem_remove.setIcon(ImageIconMananger.DELETE.getImageIcon20_20());
jMenuItem_remove.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
mainForm.getMouseLoading().startLoading();
int i = JOptionPane.showConfirmDialog(null, "确定删除笔记本[" + notebookName + "]？", "删除笔记本", JOptionPane.YES_NO_OPTION);
if (i == 0) {
noteBookService.removeNoteBook(notebookName);
refresh(null, null, null);
}
mainForm.getMouseLoading().stopLoading();
}
});
treeJPopupMenu.add(jMenuItem_addNote);
treeJPopupMenu.add(jMenuItem_rename);
treeJPopupMenu.add(jMenuItem_remove);
return treeJPopupMenu;
}
private JPopupMenu noteMenu(String notebookName, String noteName) {
JPopupMenu treeJPopupMenu = new JPopupMenu();
JMenuItem jMenuItem_remove = new JMenuItem("删除笔记");
jMenuItem_remove.setIcon(ImageIconMananger.DELETE.getImageIcon20_20());
jMenuItem_remove.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
mainForm.getMouseLoading().startLoading();
int i = JOptionPane.showConfirmDialog(null, "确定删除笔记[" + noteName + "]？", "删除笔记", JOptionPane.YES_NO_OPTION);
if (i == 0) {
noteService.removeNote(notebookName, noteName);
refresh(null, null, null);
}
mainForm.getMouseLoading().stopLoading();
}
});
treeJPopupMenu.add(jMenuItem_remove);
return treeJPopupMenu;
}
/**
* 定位选中的笔记
*/
private void findInTree() {
if (Auth.getInstance().getSelectedNoteBookName() == null) {
return;
}
Object root = this.getModel().getRoot();
TreePath treePath = new TreePath(root);
treePath = findInPath(treePath, Auth.getInstance().getSelectedNoteBookName(), Auth.getInstance().getSelectedNoteName());
setSelected(treePath);
}
private void setSelected(TreePath treePath) {
if (treePath != null) {
this.setSelectionPath(treePath);
this.scrollPathToVisible(treePath);
}
}
private TreePath findInPath(TreePath treePath, String notebookName, String noteName) {
Object object = treePath.getLastPathComponent();
if (object == null) {
return null;
}
String value = object.toString();
if (noteName != null && noteName.equals(value) && treePath.getParentPath().getLastPathComponent().toString().equals(notebookName)) {
return treePath;
} else if (noteName == null && notebookName.equals(value)) {
return treePath;
} else {
TreeModel model = this.getModel();
int n = model.getChildCount(object);
for (int i = 0; i < n; i++) {
Object child = model.getChild(object, i);
TreePath path = treePath.pathByAddingChild(child);
path = findInPath(path, notebookName, noteName);
if (path != null) {
return path;
}
}
return null;
}
}
/**
* 全部展开
*
* @param tree
* @param parent
* @param expand
*/
private static void expandAll(JTree tree, TreePath parent, boolean expand) {
// Traverse children
TreeNode node = (TreeNode) parent.getLastPathComponent();
if (node.getChildCount() >= 0) {
for (Enumeration e = node.children(); e.hasMoreElements(); ) {
TreeNode n = (TreeNode) e.nextElement();
TreePath path = parent.pathByAddingChild(n);
expandAll(tree, path, expand);
}
}
// Expansion or collapse must be done bottom-up
if (expand) {
tree.expandPath(parent);
} else {
tree.collapsePath(parent);
}
}
public void onAddNotebook() {
String typeName = (String) JOptionPane.showInputDialog(null, "", "请输入笔记本的名称",
JOptionPane.QUESTION_MESSAGE);
if (typeName != null) {
if (!typeName.equals("")) {
if (typeName.length() <= 100) {
noteBookService.addNoteBook(typeName);
refresh(null, null, null);
} else {
JOptionPane.showMessageDialog(null, "笔记本名称限制100字符！", "创建笔记本失败", JOptionPane.WARNING_MESSAGE);
}
} else {
JOptionPane.showMessageDialog(null, "笔记本名称不能为空！", "创建笔记本失败", JOptionPane.WARNING_MESSAGE);
}
}
}
public void onAddNote(String notebookName) {
new EditForm(mainForm);
}
FocusListener fl = new FocusListener() {
@Override
public void focusGained(FocusEvent e) {
e.getComponent().repaint();
}
@Override
public void focusLost(FocusEvent e) {
e.getComponent().repaint();
}
};
@Override
public void paintComponent(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
if (mouseRow > 0 && mouseRow < this.getRowCount()) {
g.setColor(MOUSE_BACKGROUD);
Rectangle r = getRowBounds(mouseRow);
g.fillRect(0, r.y, getWidth(), r.height);
g.drawRect(0, r.y, getWidth() - 1, r.height - 1);
MyTreeCellRenderer.mouseEnter = true;
MyTreeCellRenderer.mouseRow = mouseRow;
} else {
MyTreeCellRenderer.mouseEnter = false;
}
if (getSelectionCount() > 0) {
g.setColor(SELECTED_BACKGROUD);
for (int i : getSelectionRows()) {
Rectangle r = getRowBounds(i);
g.fillRect(0, r.y, getWidth(), r.height);
}
}
super.paintComponent(g);
if (getLeadSelectionPath() != null) {
Rectangle r = getRowBounds(getRowForPath(getLeadSelectionPath()));
g.setColor(SELECTED_BACKGROUD);
g.drawRect(0, r.y, getWidth() - 1, r.height - 1);
}
}
}
class MyTreeCellRenderer extends DefaultTreeCellRenderer {
private static final Color SELECTED_BACKGROUD = new Color(115, 115, 115);
private static final Color MOUSE_BACKGROUD = new Color(222, 222, 222);
public static boolean mouseEnter;
public static int mouseRow;
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus) {
//执行父类原型操作
JLabel l = (JLabel) super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf,
row, hasFocus);
if (mouseEnter && !selected && mouseRow == row) {
l.setBackground(mouseEnter ? MOUSE_BACKGROUD : tree.getBackground());
} else {
l.setBackground(selected ? SELECTED_BACKGROUD : tree.getBackground());
}
l.setOpaque(true);
setText(value.toString());
setIcon(null);
//得到每个节点的TreeNode
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
int level = node.getLevel();
switch (level) {
case 1:
setFont(new Font("SimSun", Font.BOLD, 16));
break;
case 2:
setFont(new Font("SimSun", Font.PLAIN, 14));
break;
default:
break;
}
return this;
}
}
鼠标行选的核心是下面三段
this.addMouseMotionListener(new MouseMotionAdapter() {
@Override
public void mouseMoved(MouseEvent arg0) {
int y = (int) arg0.getPoint().getY();
mouseRow = matchRow(y);
NoteBookTree.this.repaint();
}
});private int matchRow(int y) {
int r = -1;
for (int i = 0; i < this.getRowCount(); i++) {
Rectangle rowBounds = this.getRowBounds(i);
int y1 = (int) rowBounds.getY();
int y2 = TREENODE_HIGH_LINE + (int) rowBounds.getY();
if (y >= y1 && y <= y2) {
r = i;
break;
}
}
return r;
} @Override
public void paintComponent(Graphics g) {
g.setColor(getBackground());
g.fillRect(0, 0, getWidth(), getHeight());
if (mouseRow > 0 && mouseRow < this.getRowCount()) {
g.setColor(MOUSE_BACKGROUD);
Rectangle r = getRowBounds(mouseRow);
g.fillRect(0, r.y, getWidth(), r.height);
g.drawRect(0, r.y, getWidth() - 1, r.height - 1);
MyTreeCellRenderer.mouseEnter = true;
MyTreeCellRenderer.mouseRow = mouseRow;
} else {
MyTreeCellRenderer.mouseEnter = false;
}
if (getSelectionCount() > 0) {
g.setColor(SELECTED_BACKGROUD);
for (int i : getSelectionRows()) {
Rectangle r = getRowBounds(i);
g.fillRect(0, r.y, getWidth(), r.height);
}
}
super.paintComponent(g);
if (getLeadSelectionPath() != null) {
Rectangle r = getRowBounds(getRowForPath(getLeadSelectionPath()));
g.setColor(SELECTED_BACKGROUD);
g.drawRect(0, r.y, getWidth() - 1, r.height - 1);
}
}