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怎么在Java中使用JTree樹狀組件？相信很多沒有經驗的人對此束手無策，為此本文總結了問題出現的原因和解決方法，通過這篇文章希望你能解決這個問題。
一、簡單樣式
TreeNodeDemo.java
package awtDemo;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
public class TreeNodeDemo {
public static void main(String[] args) {
// 創建沒有父節點和子節點、但允許有子節點的樹節點，并使用指定的用戶對象對它進行初始化。
// public DefaultMutableTreeNode(Object userObject)
DefaultMutableTreeNode group1 = new DefaultMutableTreeNode("軟件部");
TreeNode node1 = new TreeNode();
node1.setName("王雨");
node1.setNickName("漫天飛舞");
group1.add(new DefaultMutableTreeNode(node1));
TreeNode node2 = new TreeNode();
node2.setName("陳夢");
node2.setNickName("夢");
group1.add(new DefaultMutableTreeNode(node2));
TreeNode node3 = new TreeNode();
node3.setName("上官飛兒");
node3.setNickName("飛兒");
group1.add(new DefaultMutableTreeNode(node3));
DefaultMutableTreeNode group2 = new DefaultMutableTreeNode("銷售部");
TreeNode node4 = new TreeNode();
node4.setName("上官婉兒");
node4.setNickName("婉兒");
group2.add(new DefaultMutableTreeNode(node4));
TreeNode node5 = new TreeNode();
node5.setName("上官巧兒");
node5.setNickName("巧兒");
group2.add(new DefaultMutableTreeNode(node5));
DefaultMutableTreeNode top = new DefaultMutableTreeNode("職員管理");
top.add(group1);
top.add(group2);
final JTree tree = new JTree(top);
JFrame f = new JFrame("JTreeDemo - www.jb51.net");
f.add(tree);
f.setSize(300, 300);
f.setVisible(true);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// 添加選擇事件
tree.addTreeSelectionListener(new TreeSelectionListener()
{
@Override
public void valueChanged(TreeSelectionEvent e)
{
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if (node == null){
return;
}//if
Object object = node.getUserObject();
TreeNode user = (TreeNode) object;
System.out.println("你選擇了：" + user.toString());
}
});
}
}TreeNode.java
package awtDemo;
public class TreeNode {
private String nickName = "";
private String name = "";
private String phone = "";
private int age;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNickName() {
return nickName;
}
public void setNickName(String nickName) {
this.nickName = nickName;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
// 重點在toString，節點的顯示文本就是toString
public String toString()
{
return name + "["+nickName+"]";
}
}二、圖標樣式
運行效果：
TreeNode.java
package awtDemo;
public class TreeNode {
private String nickName = "";
private String name = "";
private String phone = "";
private int age;
private String imagePath = "";
public String getImagePath() {
return imagePath;
}
public void setImagePath(String imagePath) {
this.imagePath = imagePath;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getNickName() {
return nickName;
}
public void setNickName(String nickName) {
this.nickName = nickName;
}
public String getPhone() {
return phone;
}
public void setPhone(String phone) {
this.phone = phone;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
// 重點在toString，節點的顯示文本就是toString
public String toString()
{
return name + "["+nickName+"]";
}
}TreeCellRenderer.java
package awtDemo;
import java.awt.Component;
import javax.swing.ImageIcon;
import javax.swing.JTree;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellRenderer;
/**
* 自定義樹描述類,將樹的每個節點設置成不同的圖標
*
*/
public class TreeCellRenderer extends DefaultTreeCellRenderer{
private static final long serialVersionUID = 1L;
/**
* 重寫父類DefaultTreeCellRenderer的方法
*/
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean isLeaf, int row,boolean hasFocus)
{
// 選中
if (selected)
{
setForeground(getTextSelectionColor());
}
else
{
setForeground(getTextNonSelectionColor());
}
// TreeNode
DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode) value;
Object obj = treeNode.getUserObject();
if (obj instanceof TreeNode)
{
TreeNode node = (TreeNode) obj;
DefaultTreeCellRenderer tempCellRenderer = new DefaultTreeCellRenderer();
tempCellRenderer.setLeafIcon(new ImageIcon(node.getImagePath()));
return tempCellRenderer.getTreeCellRendererComponent(tree, node.toString(), selected, expanded, true, row, hasFocus);
}
else if (obj instanceof String)
{
String text = (String) obj;
DefaultTreeCellRenderer tempCellRenderer = new DefaultTreeCellRenderer();
tempCellRenderer.setOpenIcon(new ImageIcon("Image/open.jpg"));
tempCellRenderer.setClosedIcon(new ImageIcon("Image/close.jpg"));
return tempCellRenderer.getTreeCellRendererComponent(tree, text, selected, expanded, false, row, hasFocus);
}
return super.getTreeCellRendererComponent(tree, value, selected, expanded, isLeaf, row, hasFocus);
}
}TreeNodeDemo.java
package awtDemo;
import javax.swing.JFrame;
import javax.swing.JTree;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
public class TreeNodeDemo {
public static void main(String[] args) {
// 創建沒有父節點和子節點、但允許有子節點的樹節點，并使用指定的用戶對象對它進行初始化。
// public DefaultMutableTreeNode(Object userObject)
DefaultMutableTreeNode group1 = new DefaultMutableTreeNode("軟件部");
TreeNode node1 = new TreeNode();
node1.setName("王雨");
node1.setNickName("漫天飛舞");
node1.setImagePath("Image/1.jpg");
group1.add(new DefaultMutableTreeNode(node1));
TreeNode node2 = new TreeNode();
node2.setName("陳夢");
node2.setNickName("夢");
node2.setImagePath("Image/2.jpg");
group1.add(new DefaultMutableTreeNode(node2));
TreeNode node3 = new TreeNode();
node3.setName("上官飛兒");
node3.setNickName("飛兒");
node3.setImagePath("Image/3.jpg");
group1.add(new DefaultMutableTreeNode(node3));
DefaultMutableTreeNode group2 = new DefaultMutableTreeNode("銷售部");
TreeNode node4 = new TreeNode();
node4.setName("上官婉兒");
node4.setNickName("婉兒");
node4.setImagePath("Image/4.jpg");
group2.add(new DefaultMutableTreeNode(node4));
TreeNode node5 = new TreeNode();
node5.setName("上官巧兒");
node5.setNickName("巧兒");
node5.setImagePath("Image/5.jpg");
group2.add(new DefaultMutableTreeNode(node5));
DefaultMutableTreeNode root = new DefaultMutableTreeNode();
root.add(group1);
root.add(group2);
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
final JTree tree = new JTree(root);
tree.setCellRenderer(new TreeCellRenderer());
tree.putClientProperty("JTree.lineStyle", "None");
tree.setRootVisible(true);
JFrame frame = new JFrame("JTreeDemo - www.jb51.net");
frame.add(tree);
frame.setSize(300, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// 添加選擇事件
tree.addTreeSelectionListener(new TreeSelectionListener()
{
@Override
public void valueChanged(TreeSelectionEvent e)
{
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
if (node == null){
return;
}//if
Object object = node.getUserObject();
if(object instanceof TreeNode)
{
TreeNode user = (TreeNode) object;
System.out.println("你點擊了：" + user.toString());
}
else if(object instanceof String)
{
String text = (String)object;
System.out.println("你點擊了：" + text);
}
}
});
}
}看完上述內容，你們掌握怎么在Java中使用JTree樹狀組件的方法了嗎？如果還想學到更多技能或想了解更多相關內容，歡迎關注億速云行業資訊頻道，感謝各位的閱讀！
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