树形菜单记事本

引用

import javax.swing.*;
import javax.swing.tree.*;
import javax.swing.event.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;

class Remember extends JFrame implements TreeSelectionListener,ActionListener
{
JTree tree=null;
JTextArea text=new JTextArea(20,20);
int i=0;
DefaultMutableTreeNode root;
JButton b_save=new JButton("保存日记");
JButton b_del=new JButton("删除日记");
DefaultMutableTreeNode month[]=new DefaultMutableTreeNode[13];


Remember()
{
  Container con=getContentPane();
  DefaultMutableTreeNode root=new DefaultMutableTreeNode("日历记事本");
  for(i=1;i<=12;i++)
  {
   month=new DefaultMutableTreeNode(""+i+"月");
   root.add(month);
  }
  for(i=1;i<=12;i++)
  {
   if(i==1||i==3||i==5||i==7||i==8||i==10||i==12)
   {
    for(int j=1;j<=31;j++)
    month.add(new DefaultMutableTreeNode(j+"日"));
   }
   else if(i==4||i==6||i==9||i==11)
   {
    for(int j=1;j<=30;j++)
     month.add(new DefaultMutableTreeNode(j+"日"));
   }
   else
   {
    for (int j=1;j<=28;j++)
     month.add(new DefaultMutableTreeNode(j+"日"));
   }
  }
 
  b_save.addActionListener(this);
  b_del.addActionListener(this);
  tree=new JTree(root);
  JPanel p=new JPanel();
  p.setLayout(new BorderLayout());
  JScrollPane scrollpane_1=new JScrollPane(text);
  p.add(scrollpane_1,BorderLayout.CENTER);
  JPanel p_1=new JPanel();
  p_1.add(b_save);
  p_1.add(b_del);
  p.add(p_1,BorderLayout.NORTH);
  JScrollPane scrollpane_2=new JScrollPane(tree);
  JSplitPane splitpane=new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,true,scrollpane_2,p);
  tree.addTreeSelectionListener(this);
  con.add(splitpane);
  setVisible(true);
  setBounds(70,80,460,320);
  setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
public void valueChanged(TreeSelectionEvent e)
{
  text.setText(null);
  if(e.getSource()==tree)
  {
   DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
         if(node.isLeaf())
         {
          String str=node.toString();
          for(int i=0;i<=12;i++)
          {
           if(node.getParent()==month)
           {
            try{
             String temp=null;
             File f=new File(node.getParent().toString()+str+".txt");
             FileReader file=new FileReader(f);
             BufferedReader in=new BufferedReader(file);
             while((temp=in.readLine())!=null)
               text.append(temp+'\n');
             file.close();
             in.close();
            }
            catch(Exception el){}
           }
          }
         }
  }
}
public void actionPerformed(ActionEvent e)
{
  if(e.getSource()==b_save)
  {
   DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
   String str=node.toString();
   if(node.isLeaf())
   {
    try
    {
     File f=new File(node.getParent().toString()+str+".txt");
     FileWriter tofile=new FileWriter(f);
     BufferedWriter out=new BufferedWriter(tofile);
     out.write(text.getText(),0,(text.getText()).length());
     out.flush();
     tofile.close();
     out.close();
    }
    catch(Exception el){}
   }
  }
  else if(e.getSource()==b_del)
  {
   DefaultMutableTreeNode node=(DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
   String str=node.toString();
   if(node.isLeaf())
   {
    File f=new File(node.getParent().toString()+str+".txt");
    f.delete();
   }
  }
}
}


public class Example17_13 {

public static void main(String[] args) {
  // TODO Auto-generated method stub
        Remember win=new Remember();
        win.validate();
}
}

树状的记事本，可以实现每天的记事与日记，树状查找与删除！