[轉]JTree用法及JTree使用經驗總結

時間 2019-12-11

原文原文鏈接

import  java.awt.Dimension;
import  java.awt.Color;
import  javax.swing.JFrame;
import  javax.swing.JPanel;
import  javax.swing.JScrollPane;
import  javax.swing.JTree;
import  javax.swing.BoxLayout;
import  javax.swing.tree.TreePath;
import  javax.swing.tree.DefaultMutableTreeNode;
import  javax.swing.tree.DefaultTreeModel;
/* 
JTree的構造函數:
JTree()
JTree(Hashtable value)
JTree(Object[] value)//只有這個構造函數能夠建立多個根結點
JTree(TreeModel newModel)
JTree(TreeNode root)
JTree(TreeNode root, boolean asksAllowsChildren)
JTree(Vector value)

*/ 
public   class  JTreeDemo
{
  public   static   void  main (String[] args)
 {


   // 構造函數：JTree() 
  JTree example1  =   
new  JTree();

 

  
   // 構造函數：JTree(Object[] value) 
  Object[] letters =  { 
" a " 
,  " b 
" ,  " 
c " ,  
" d " 
,  " e 
" };
  JTree example2  =   
new  JTree (letters);

 


   // 構造函數：JTree(TreeNode root)(TreeNode空)
   // 用空結點建立樹 
  DefaultMutableTreeNode node1  =   
new  DefaultMutableTreeNode(); // 定義樹結點 
  JTree example3  =   
new  JTree (node1); // 用此樹結點作參數調用 JTree的構造函數建立含有一個根結點的樹

 


   // 構造函數：JTree(TreeNode root)(同上,只是TreeNode非空)
   // 用一個根結點建立樹 
  DefaultMutableTreeNode node2  =   
new  DefaultMutableTreeNode( " Color 
" );
  JTree example4  =   
new  JTree (node2); // 結點不能夠顏色,默認爲白麪黑字 
  example4.setBackground (Color.lightGray);

 


   // 構造函數：JTree(TreeNode root, boolean asksAllowsChildren)(同上,只是TreeNode又有不一樣)
   // 使用DefaultMutableTreeNode類先用一個根結點建立樹，設置爲可添加孩子結點,再添加孩子結點 
  DefaultMutableTreeNode color  =   
new  DefaultMutableTreeNode( " Color 
" ,  true );
  DefaultMutableTreeNode gray  =   
new  DefaultMutableTreeNode ( " Gray 
" );
  color.add (gray);
  color.add ( 
new  DefaultMutableTreeNode ( " Red 
" ));
  gray.add ( new  DefaultMutableTreeNode ( " Lightgray " ));
  gray.add ( new  DefaultMutableTreeNode ( " Darkgray " ));
  color.add ( new  DefaultMutableTreeNode ( " Green 
" ));
  JTree example5  =   
new  JTree (color);
  
  
  
  
   // 構造函數：JTree(TreeNode root)(同上,只是TreeNode非空)
   // 經過逐個添加結點建立樹 
  DefaultMutableTreeNode biology  =   
new  DefaultMutableTreeNode ( " Biology " );
  DefaultMutableTreeNode animal  =   
new  DefaultMutableTreeNode ( " Animal 
" );
  DefaultMutableTreeNode mammal  =   
new  DefaultMutableTreeNode ( " Mammal 
" );
  DefaultMutableTreeNode horse  =   
new  DefaultMutableTreeNode ( " Horse 
" );
  mammal.add (horse);
  animal.add (mammal);
  biology.add (animal);
  JTree example6  
=   new  JTree (biology);
  horse.isLeaf();
  horse.isRoot();
  
  


   // 構造函數:JTree(TreeModel newModel)
   // 用DefaultMutableTreeNodel類定義一個結點再用這個結點作參數定義一個用DefaultTreeMode
   // 建立一個樹的模型,再用JTree的構造函數建立一個樹 
  
  DefaultMutableTreeNode root  =   
new  DefaultMutableTreeNode ( " Root1 
" );
  DefaultMutableTreeNode child1  =   
new  DefaultMutableTreeNode ( " Child1 
" );
  DefaultMutableTreeNode child11  =   
new  DefaultMutableTreeNode ( " Child11 " );
  DefaultMutableTreeNode child111  =   
new  DefaultMutableTreeNode ( " Child111 " );
  root.add (child1); child1.add (child11); child11.add (child111);
  
  
  
  DefaultTreeModel model  
=   new  DefaultTreeModel (root);
  
  JTree example7  
=   new  JTree (model);

 

  JPanel panel  
=   new  JPanel();
  panel.setLayout ( new  BoxLayout (panel, BoxLayout.X_AXIS));
  panel.setPreferredSize ( 
new  Dimension ( 700 ,  
400 ));
  panel.add ( new  JScrollPane (example1)); // JTree必須放在JScrollPane上 
  panel.add ( new  JScrollPane (example2));
  panel.add ( 
new  JScrollPane (example3));
  panel.add ( 
new  JScrollPane (example4));
  panel.add ( 
new  JScrollPane (example5));
  panel.add ( 
new  JScrollPane (example6));
  panel.add ( 
new  JScrollPane (example7));
  

 

  JFrame frame  
=   new  JFrame ( " JTreeDemo " );
  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
  frame.setContentPane (panel);
  frame.pack();
  frame.show();
 }
}

import java.awt.Dimension;
import java.awt.Color;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.BoxLayout;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
/*
JTree的構造函數:
JTree()
JTree(Hashtable value)
JTree(Object[] value)//只有這個構造函數能夠建立多個根結點
JTree(TreeModel newModel)
JTree(TreeNode root)
JTree(TreeNode root, boolean asksAllowsChildren)
JTree(Vector value)

*/
public class JTreeDemo
{
public static void main (String[] args)
{

   // 構造函數：JTree()
  JTree example1 = new JTree();


   // 構造函數：JTree(Object[] value)
  Object[] letters = { " a " , " b " , " c " , " d " , " e " };
  JTree example2 = new JTree (letters);

   // 構造函數：JTree(TreeNode root)(TreeNode空)
   // 用空結點建立樹
  DefaultMutableTreeNode node1 = new DefaultMutableTreeNode(); // 定義樹結點
  JTree example3 = new JTree (node1); // 用此樹結點作參數調用 JTree的構造函數建立含有一個根結點的樹

   // 構造函數：JTree(TreeNode root)(同上,只是TreeNode非空)
   // 用一個根結點建立樹
  DefaultMutableTreeNode node2 = new DefaultMutableTreeNode( " Color " );
  JTree example4 = new JTree (node2); // 結點不能夠顏色,默認爲白麪黑字
  example4.setBackground (Color.lightGray);

   // 構造函數：JTree(TreeNode root, boolean asksAllowsChildren)(同上,只是TreeNode又有不一樣)
   // 使用DefaultMutableTreeNode類先用一個根結點建立樹，設置爲可添加孩子結點,再添加孩子結點
  DefaultMutableTreeNode color = new DefaultMutableTreeNode( " Color " , true );
  DefaultMutableTreeNode gray = new DefaultMutableTreeNode ( " Gray " );
  color.add (gray);
  color.add ( new DefaultMutableTreeNode ( " Red " ));
  gray.add ( new DefaultMutableTreeNode ( " Lightgray " ));
  gray.add ( new DefaultMutableTreeNode ( " Darkgray " ));
  color.add ( new DefaultMutableTreeNode ( " Green " ));
  JTree example5 = new JTree (color);




   // 構造函數：JTree(TreeNode root)(同上,只是TreeNode非空)
   // 經過逐個添加結點建立樹
  DefaultMutableTreeNode biology = new DefaultMutableTreeNode ( " Biology " );
  DefaultMutableTreeNode animal = new DefaultMutableTreeNode ( " Animal " );
  DefaultMutableTreeNode mammal = new DefaultMutableTreeNode ( " Mammal " );
  DefaultMutableTreeNode horse = new DefaultMutableTreeNode ( " Horse " );
  mammal.add (horse);
  animal.add (mammal);
  biology.add (animal);
  JTree example6 = new JTree (biology);
  horse.isLeaf();
  horse.isRoot();



   // 構造函數:JTree(TreeModel newModel)
   // 用DefaultMutableTreeNodel類定義一個結點再用這個結點作參數定義一個用DefaultTreeMode
   // 建立一個樹的模型,再用JTree的構造函數建立一個樹

  DefaultMutableTreeNode root = new DefaultMutableTreeNode ( " Root1 " );
  DefaultMutableTreeNode child1 = new DefaultMutableTreeNode ( " Child1 " );
  DefaultMutableTreeNode child11 = new DefaultMutableTreeNode ( " Child11 " );
  DefaultMutableTreeNode child111 = new DefaultMutableTreeNode ( " Child111 " );
  root.add (child1); child1.add (child11); child11.add (child111);



  DefaultTreeModel model = new DefaultTreeModel (root);

  JTree example7 = new JTree (model);

  JPanel panel = new JPanel();
  panel.setLayout ( new BoxLayout (panel, BoxLayout.X_AXIS));
  panel.setPreferredSize ( new Dimension ( 700 , 400 ));
  panel.add ( new JScrollPane (example1)); // JTree必須放在JScrollPane上
  panel.add ( new JScrollPane (example2));
  panel.add ( new JScrollPane (example3));
  panel.add ( new JScrollPane (example4));
  panel.add ( new JScrollPane (example5));
  panel.add ( new JScrollPane (example6));
  panel.add ( new JScrollPane (example7));


  JFrame frame = new JFrame ( " JTreeDemo " );
  frame.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
  frame.setContentPane (panel);
  frame.pack();
  frame.show();
}
}java

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node

在實際開發過程當中會常常使用JTree組件，平時會遇到這樣或那樣的問題，在此將偶得一點經驗寫下來，與你們共享，但願對你們有所幫助。數組

private JTree jtNetDevice;//數組件申明
private JScrollPane jspTree;//滾動面板申明jsp

一、初始化
    DefaultMutableTreeNode rootNode = new DefaultMutableTreeNode("root");
    jtNetDevice = new JTree(rootNode);
    jtNetDevice.setAutoscrolls(true);
    getTreeSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);//設置單選模式
    jspTree = new JScrollPane();
    jspTree.getViewport().add(jtNetDevice, null);函數

二、三個常常使用的取值函數
private DefaultTreeModel getTreeModel(){
return (DefaultTreeModel)jtNetDevice.getModel();
}spa

private DefaultMutableTreeNode getRootNode(){
return (DefaultMutableTreeNode)getTreeModel().getRoot();
}

private TreeSelectionModel getTreeSelectionModel(){
return jtNetDevice.getSelectionModel();
}
code

三、根據node獲得path：
TreePath visiblePath = new TreePath(getTreeModel().getPathToRoot(node));開發

四、根據Path展開到該節點
jtNetDevice.makeVisible(visiblePath);get

五、根據path設定該節點選定
jtNetDevice.setSelectionPath(visiblePath);it

六、選中節點的方法
首先，根據節點獲得樹路徑，其中chosen爲須要選中的節點
TreePath visiblePath = new TreePath( ( (DefaultTreeModel) jtNetDevice.getModel()).
getPathToRoot(chosen));
而後根據Path選中該節點
jtNetDevice.setSelectionPath(visiblePath);

七、滾動到可見位置
jtNetDevice.scrollPathToVisible(visiblePath);

八、給JTree添加右鍵彈出菜單
void jtNetDevice_mouseReleased(MouseEvent e) {
    if (e.isPopupTrigger()) {
      jPopupMenu1.show(e.getComponent(), e.getX(), e.getY());//彈出右鍵菜單
    }
}

九、關於JTree的展開
   // If expand is true, expands all nodes in the tree.
   // Otherwise, collapses all nodes in the tree.
   public void expandAll(JTree tree, boolean expand) {
       TreeNode root = (TreeNode)tree.getModel().getRoot();

       // Traverse tree from root
       expandAll(tree, new TreePath(root), expand);
   }
   private 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);
       }
   }

十、如何遍歷JTree // 建立樹 JTree tree = new JTree(); // 添加樹節點...... // 遍歷全部節點 visitAllNodes(tree); // 僅遍歷展開的節點 visitAllExpandedNodes(tree); // Traverse all nodes in tree public void visitAllNodes(JTree tree) { TreeNode root = (TreeNode)tree.getModel().getRoot(); visitAllNodes(root); } public void visitAllNodes(TreeNode node) { // node is visited exactly once process(node); if (node.getChildCount() >= 0) { for (Enumeration e=node.children(); e.hasMoreElements(); ) { TreeNode n = (TreeNode)e.nextElement(); visitAllNodes(n); } } } // Traverse all expanded nodes in tree public void visitAllExpandedNodes(JTree tree) { TreeNode root = (TreeNode)tree.getModel().getRoot(); visitAllExpandedNodes(tree, new TreePath(root)); } public void visitAllExpandedNodes(JTree tree, TreePath parent) { // Return if node is not expanded if (!tree.isVisible(parent)) { return; } // node is visible and is visited exactly once TreeNode node = (TreeNode)parent.getLastPathComponent(); process(node); // Visit all children if (node.getChildCount() >= 0) { for (Enumeration e=node.children(); e.hasMoreElements(); ) { TreeNode n = (TreeNode)e.nextElement(); TreePath path = parent.pathByAddingChild(n); visitAllExpandedNodes(tree, path); } } }

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