本文实例讲述了Java Swing树状组件JTree用法。分享给大家供大家参考，具体如下：

一、简单样式

先看运行效果：

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) { // 创建没有父节点和子节点、但允许有子节点的树节点，并使用指定的用户对象对它进行初始化。 // public DefaultMutableTreeNode(Object userObject) DefaultMutableTreeNode group1 = new DefaultMutableTreeNode("软件部"); TreeNode node1 = new TreeNode(); node1.setName("王雨"); node1.setNickName("漫天飞舞"); group1.add(new DefaultMutableTreeNode(node1)); TreeNode node2 = new TreeNode(); node2.setName("陈梦"); node2.setNickName("梦"); group1.add(new DefaultMutableTreeNode(node2)); TreeNode node3 = new TreeNode(); node3.setName("上官飞儿"); node3.setNickName("飞儿"); group1.add(new DefaultMutableTreeNode(node3)); DefaultMutableTreeNode group2 = new DefaultMutableTreeNode("销售部"); TreeNode node4 = new TreeNode(); node4.setName("上官婉儿"); node4.setNickName("婉儿"); group2.add(new DefaultMutableTreeNode(node4)); TreeNode node5 = new TreeNode(); node5.setName("上官巧儿"); node5.setNickName("巧儿"); group2.add(new DefaultMutableTreeNode(node5)); DefaultMutableTreeNode top = new DefaultMutableTreeNode("职员管理"); top.add(group1); top.add(group2); final JTree tree = new JTree(top); JFrame f = new JFrame("JTreeDemo - "); f.add(tree); f.setSize(300, 300); f.setVisible(true); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); // 添加选择事件 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("你选择了：" + 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; } // 重点在toString，节点的显示文本就是toString public String toString() { return name + "["+nickName+"]"; }}

二、图标样式

运行效果：

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; } // 重点在toString，节点的显示文本就是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;/** * 自定义树描述类,将树的每个节点设置成不同的图标 * */public class TreeCellRenderer extends DefaultTreeCellRenderer{ private static final long serialVersionUID = 1L; /** * 重写父类DefaultTreeCellRenderer的方法 */ @Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean isLeaf, int row,boolean hasFocus) { // 选中 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) { // 创建没有父节点和子节点、但允许有子节点的树节点，并使用指定的用户对象对它进行初始化。 // public DefaultMutableTreeNode(Object userObject) DefaultMutableTreeNode group1 = new DefaultMutableTreeNode("软件部"); TreeNode node1 = new TreeNode(); node1.setName("王雨"); node1.setNickName("漫天飞舞"); node1.setImagePath("Image/1.jpg"); group1.add(new DefaultMutableTreeNode(node1)); TreeNode node2 = new TreeNode(); node2.setName("陈梦"); node2.setNickName("梦"); node2.setImagePath("Image/2.jpg"); group1.add(new DefaultMutableTreeNode(node2)); TreeNode node3 = new TreeNode(); node3.setName("上官飞儿"); node3.setNickName("飞儿"); node3.setImagePath("Image/3.jpg"); group1.add(new DefaultMutableTreeNode(node3)); DefaultMutableTreeNode group2 = new DefaultMutableTreeNode("销售部"); TreeNode node4 = new TreeNode(); node4.setName("上官婉儿"); node4.setNickName("婉儿"); node4.setImagePath("Image/4.jpg"); group2.add(new DefaultMutableTreeNode(node4)); TreeNode node5 = new TreeNode(); node5.setName("上官巧儿"); node5.setNickName("巧儿"); 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 - "); frame.add(tree); frame.setSize(300, 300); frame.setVisible(true); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ // 添加选择事件 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("你点击了：" + user.toString()); } else if(object instanceof String) { String text = (String)object; System.out.println("你点击了：" + text); } } }); }}

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