1.用到的類: JTree , ?DefaultMutableTreeNode, DefaultTreeCellRenderer

2.默認情況下節點顯示的是DefaultMutableTreeNode對象的setUserObject(Object obj)中obj的toString方法的返回值。

3.寫個類繼承DefaultTreeCellRenderer，重寫getTreeCellRendererComponent方法就可以了。

4.結果如圖：

5.代碼

1.User類

package lova.tree.pojo;

public class User {

private String account; //賬號

private String signature;//簽名

private String iconPath;//頭像路徑

public User(String account,String signature,String iconPath){

this.account = account;

this.signature = signature;

this.iconPath = iconPath;

}

public String getAccount() {

return account;

}

public void setAccount(String account) {

this.account = account;

}

public String getSignature() {

return signature;

}

public void setSignature(String signature) {

this.signature = signature;

}

public String getIconPath() {

return iconPath;

}

public void setIconPath(String iconPath) {

this.iconPath = iconPath;

}

public String toString(){

return " [ "+ account + "] " + signature;

}

}

2.Group類

package lova.tree.pojo;

public class Group {

private String name; //組名

public Group(String name){

this.name = name;

}

public String getName() {

return name;

}

public void setName(String name) {

this.name = name;

}

}

3.窗口類CustomTreeFrame

package lova.tree;

import java.awt.FlowLayout;

import javax.swing.JFrame;

import javax.swing.JTree;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeModel;

import lova.tree.pojo.Group;

import lova.tree.pojo.User;

/*

* 自定義JTree的顯示需要設置渲染器

* 寫個類繼承DefaultTreeCellRenderer，重寫getTreeCellRendererComponent方法即可

*/

public class CustomTreeFrame extends JFrame{

private static final long serialVersionUID = 1L;

private JTree tree;

public CustomTreeFrame(){

/*

* 換一種LookAndFeel

*/

try {

javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");

}catch(Exception e){

e.printStackTrace();

}

this.setTitle("Custom Tree Test");

this.setSize(600, 500);

this.setLayout(new FlowLayout(FlowLayout.LEFT));

this.createUI();

this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

this.setVisible(true);

}

public void createUI(){

//創建JTree

tree = new JTree();

//創建根節點

DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode();

rootNode.setUserObject(new Group("我的好友"));

User u1 = new User("seven","我叫龔順子!","G:/seven.jpg");

User u2 = new User("lova","lova-lova-lova-lova","G:/lena.jpg");

//節點默認顯示setUserObject(obj)中obj的toString方法的返回值

DefaultMutableTreeNode node1 = new DefaultMutableTreeNode(u1);

DefaultMutableTreeNode node2 = new DefaultMutableTreeNode(u2);

rootNode.add(node1);

rootNode.add(node2);

//創建Model

DefaultTreeModel model = new DefaultTreeModel(rootNode);

//設置Model

tree.setModel(model);

//設置JTree的渲染器

MyTreeCellRenderer renderer = new MyTreeCellRenderer();

tree.setCellRenderer(renderer);

//設置高度

tree.setRowHeight(45);

this.add(tree);

}

}

4.自定義的渲染類MyTreeCellRenderer

package lova.tree;

import java.awt.Component;

import java.awt.Dimension;

import java.awt.Image;

import javax.swing.ImageIcon;

import javax.swing.JTree;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeCellRenderer;

import lova.tree.pojo.Group;

import lova.tree.pojo.User;

public class MyTreeCellRenderer extends DefaultTreeCellRenderer {

private static final long serialVersionUID = 1L;

public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {

//將value強制轉型

DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;

String text = null; //要顯示的字符

ImageIcon icon = null;//要顯示的圖標

Object obj = node.getUserObject();

//判斷obj類型，若為User,則為子節點

if(obj instanceof User){

User user = (User) obj;

if(user.getSignature() != null){

text = user.getSignature();

}

//將圖標轉換為40*40尺寸的

if(user.getIconPath() != null){

icon = new ImageIcon(user.getIconPath());

Image img = icon.getImage();

img = img.getScaledInstance(40, 40, Image.SCALE_SMOOTH);

icon.setImage(img);

}

} //若obj類型是Group,則為根節點

else if(obj instanceof Group){

Group g = (Group) obj;

text = g.getName();

}

//若是子節點，則顯示圖標，根節點則不顯示

if(this.getParent() != tree.getModel().getRoot()){

this.setIcon(icon);

}

if(text != null){

this.setText(text);

}

//設置尺寸

this.setPreferredSize(new Dimension(300,40));

//設置字體

//this.setFont(new Font("宋體", Font.BOLD, 13));

//在設置了新的Look&Feel以后，下面代碼全部失效

//this.setTextNonSelectionColor(new Color(255,255,255));

//this.setTextSelectionColor(Color.red);

//this.setBackground(Color.WHITE);

//this.setBackgroundNonSelectionColor(Color.green);

//this.setBackgroundSelectionColor(Color.blue);

//this.setBorderSelectionColor(Color.red);

//

設置選中時的背景色

//if (selected) {

//if(row>0||leaf){

//this.setBackground(new Color(252,233,159));

//}

//

//} else {

//this.setBackground(new Color(255, 255, 255));

//

//}

return this;

}

}

5. 測試

public static void main(String[] args){

new CustomTreeFrame();

}

OK~ 希望對你有用

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