怎么在Java中使用JTree树状组件

怎么在Java中使用JTree树状组件？相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

一、简单样式

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) {    // 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 - www.jb51.net");    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;public class TreeCellRenderer extends DefaultTreeCellRenderer{  private static final long  serialVersionUID  = 1L;    @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 - www.jb51.net");    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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