tree2.java

该文件中包含有源代码及一部分的文档,该系统是一个小型的英语单词字典的系统.

package english;

import java.awt.*;
import javax.swing.tree.*;
import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;


public class Tree2 extends JPanel {
    DefaultMutableTreeNode root;
    DefaultMutableTreeNode node1;
    DefaultTreeModel model;
    BorderLayout borderLayout1 = new BorderLayout();
    JTree jTree1 = new JTree();
    JScrollPane jScrollPane1;
    Texts jpanel = new Texts(root);

    public Tree2(Texts jpanel) {
        try {
            this.jpanel = jpanel;
            jbInit();
        } catch (Exception exception) {
            exception.printStackTrace();
        }
    }

    private void jbInit() throws Exception {
        jTree1 = new JTree(this.gettreemodel());
        jScrollPane1 = new JScrollPane(jTree1);
        jTree1.addTreeSelectionListener(new Tree2_jTree1_treeSelectionAdapter(this));
        jScrollPane1.setHorizontalScrollBarPolicy(JScrollPane.
                HORIZONTAL_SCROLLBAR_AS_NEEDED);
        jScrollPane1.setVerticalScrollBarPolicy(JScrollPane.
                                                VERTICAL_SCROLLBAR_AS_NEEDED);
        this.add(jScrollPane1, java.awt.BorderLayout.CENTER);
        this.setLayout(borderLayout1);
        this.setPreferredSize(new Dimension(100, 290));
        this.add(jScrollPane1, java.awt.BorderLayout.CENTER);
        jScrollPane1.getViewport().add(jTree1);
    }

    public DefaultTreeModel gettreemodel(){
       root = new DefaultMutableTreeNode("选择故事");
       model = new DefaultTreeModel(root);
       try {
       Database db = new Database();
       ResultSet rs = db.query("select * from idiom_story order by name");
           while (rs.next()) {
                 node1 = new DefaultMutableTreeNode(rs.getString(1));
                 model.insertNodeInto(node1,root,root.getChildCount());
           }
       } catch (SQLException ex) {
           ex.printStackTrace();
       }
       return model;
   }

    public void jTree1_valueChanged(TreeSelectionEvent e) {
        String path = (String) e.getPath().toString();
        path = path.substring(path.lastIndexOf(",") + 1, path.length() - 1).trim();
        try {
            Database db = new Database();
            ResultSet rs = db.query("select * from idiom_story where name = '" +
                                    path + "'");
            if (rs.next()) {
                jpanel.jTextArea2.setText(rs.getString(2));
            }
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }

    public void repainttree(){
       jScrollPane1.remove(jTree1);
       jTree1 = new JTree(this.gettreemodel());
       jTree1.addTreeSelectionListener(new Tree2_jTree1_treeSelectionAdapter(this));
       jScrollPane1.getViewport().add(jTree1);
   }
}


class Tree2_jTree1_treeSelectionAdapter implements TreeSelectionListener {
    private Tree2 adaptee;
    Tree2_jTree1_treeSelectionAdapter(Tree2 adaptee) {
        this.adaptee = adaptee;
    }

    public void valueChanged(TreeSelectionEvent e) {
        adaptee.jTree1_valueChanged(e);
    }
}