用java实现简易日记本
package com.MyDiary;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import javax.swing.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.DefaultMutableTreeNode;
public class DiaryFrame extends JFrame
{
//JTree 声明为静态 ， 一个即可
static JTree tree = null;
//根节点root ，只有一个即可
static DefaultMutableTreeNode root = new DefaultMutableTreeNode("MY Diary");
//集合nodes保存根节点root上的子节点，每个子节点简称为一个日记本
//用泛型指明集合中的元素DefaultMultableTreeNode类型数据
static ArrayList
JTextArea jta = new JTextArea(20,30);
//空菜单条menu
MenuBar menu = null;
//三个菜单m1,m2,m3
Menu m1,m2,m3;
//菜单选项
MenuItem m1a,m1b,m1c,m1d,m2a,m2b,m3a,m3b,pma,pmb,pmc;
//弹出式菜单pMenu，
PopupMenu pMenu = null;
//保存和删除按钮
JButton bSave ,bDel;
//日记类Diary的引用
Diary diary = null;
//界面初始化
public void launchFrame()
{
int width = 640,height = 480;
setTitle("MyDiary");
setSize(width,height);
//设置软件呈现的位置在屏幕中间
setLocation((int)(Toolkit.getDefaultToolkit().getScreenSize().getWidth()-width)/2,(int)(Toolkit.getDefaultToolkit().getScreenSize().getHeight()-height)/2);
//关闭窗口
setDefaultCloseOperation(EXIT_ON_CLOSE);
//初始化菜单条，菜单和菜单选项
menu = new MenuBar();
pMenu = new PopupMenu();
m1 = new Menu("file");
m2 = new Menu("edit");
m3 = new Menu("help");
m1a = new MenuItem("new diary");
//设置快捷键
m1a.setShortcut(new MenuShortcut(KeyEvent.VK_N));
m1b = new MenuItem("save diary");
m1b.setShortcut(new MenuShortcut(KeyEvent.VK_S));
m1c = new Menu("del diary");
m1c.setShortcut(new MenuShortcut(KeyEvent.VK_D));
m1d = new MenuItem("exit System");
m1d.setShortcut(new MenuShortcut(KeyEvent.VK_Q));
m1.add(m1a);
m1.addSeparator();
m1.add(m1b);
m1.add(m1c);
m1.add(m1c);
m1.addSeparator();
m1.add(m1d);
menu.add(m1);
m2a = new MenuItem("copy");
m2a.setShortcut(new MenuShortcut(KeyEvent.VK_C));
m2b = new MenuItem("paste");
m2b.setShortcut(new MenuShortcut(KeyEvent.VK_V));
m2.add(m2a);
m2.add(m2b);
menu.add(m2);
m3a = new MenuItem("关于主题");
m3b = new MenuItem("使用手册");
m3.add(m3a);
m3.add(m3b);
menu.add(m3);
pma = new MenuItem("new diary");
pmb = new MenuItem("del diary");
pmc = new MenuItem("rename");
pMenu.add(pma);
pMenu.addSeparator();
pMenu.add(pmb);
pMenu.addSeparator();
pMenu.add(pmc);
//添加菜单条
this.setMenuBar(menu);
//用根节点root初始化JTree
tree = new JTree (root);
JScrollPane jsp1 = new JScrollPane(tree);
JPanel jp = new JPanel();
jp.setLayout(new BorderLayout());
JScrollPane jsp2 = new JScrollPane(jta);
jp.add(jsp2,BorderLayout.CENTER);
JPanel bottom= new JPanel();
bSave = new JButton("save");
bDel = new JButton("Del");
bottom.add(bSave);
bottom.add(bDel);
jp.add(bottom,BorderLayout.SOUTH);
//JSpliPane将容器分割向左右两部分
JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT,jsp1,jp);
//添加一个默认日记本“生活日记 ”
DefaultMutableTreeNode n = new Diary("生活日记");
nodes.add(n);
//监听类，用于监听JTree和JButton
MyListener listener = new MyListener();
tree.addTreeSelectionListener(listener);
//调用初始化JTree的方法
initTree();
bSave.addActionListener(listener);
bDel.addActionListener(listener);
//菜单的监听类
MenuListener menuListener = new MenuListener();
m1.addActionListener(menuListener);
m2.addActionListener(menuListener);
m3.addActionListener(menuListener);
this.getContentPane().add(splitPane);
this.setVisible(true);
}
//JTree节点的初始化方法，用于完成树上节点的添加工作
private static void initTree()
{
//将节点集合中的节点，全部添加到树上
Iterator
while(it.hasNext())
{
DefaultMutableTreeNode n = it.next();
root.add(n);
}
tree.updateUI();
tree.repaint();
}
//内部类，菜单监听
class MenuListener implements ActionListener
{
DiaryFrame df = new DiaryFrame();
public void actionPerformed(ActionEvent e)
{
//获取用户操作的菜单名称
String label = ((MenuItem)e.getSource()).getLabel();
if(label.equals("file"))
{
//根据用户选择的菜单项，实现不同功能
if(e.getActionCommand().equals("new diary"))
{
//输入对话框，对新建的日记本命名
String value = new JOptionPane().showInputDialog(df,"请输入新建的日记本名称");
//以用户输入的日记本名，新建具有日记本功能的节点】
DefaultMutableTreeNode node = new Diary(value);
//将节点添加到集合
nodes.add(node);
//重新初始化一次节点
DiaryFrame.initTree();
}
}
else if(label.equals("edit"))
{
//对“编辑”菜单的处理
}
else
{
//对帮助菜单的处理
}
}
}
//内部类，监听JTree节点选择和JButton
class MyListener implements ActionListener,TreeSelectionListener
{
DiaryFrame df = new DiaryFrame();
public void actionPerformed(ActionEvent e)
{
//根据不同的按钮，处理响应时间
//“保存按钮处理”
if(e.getSource() == bSave)
{
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
//节点node的名字
String str = node.toString();
//如果节点是叶节点，以“日记本名+月+日”为文件名，将日记文本写入文件
if(node.isLeaf())
{
BufferedWriter out = null;
try
{
//构造文件名
String fileName = node.getParent().getParent().toString()+node.getParent().toString()+str+".txt";
//构造文件
File file = new File(fileName);
//文本文件写入流
out = new BufferedWriter(new FileWriter(file));
out.write(jta.getText(),0,(jta.getText()).length());
out.flush();
new JOptionPane().showMessageDialog(df,"日记创建成功！");
}
catch (IOException err)
{
// TODO: handle exception
new JOptionPane().showMessageDialog(df,"日记创建失败！");
err.printStackTrace();
}
catch (Exception err)
{
// TODO: handle exception
err.printStackTrace();
}
finally
{
try
{
if(out != null)
out.close();
}
catch (IOException e1)
{
// TODO: handle exception
e1.printStackTrace();
}
}
}//删除按钮处理
}
else if(e.getSource() ==bDel)
{
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
String str = node.toString();
if(node.isLeaf())
{
BufferedWriter out = null;
try
{
//删除文件处理，先将预删除的文件名写入“del.bat”文件 ，在调用del()函数删除
String fileName = node.getParent().getParent().toString()+node.getParent().toString()
+str+".txt";
File file = new File(fileName);
out = new BufferedWriter(new FileWriter(new File("del.bat")));
String cmd = "del" + file.getAbsolutePath().toString();
out.write(cmd);
out.newLine();
out.flush();
jta.setText("文件已被删除");
//调用del()hanshu
del();
}
catch (IOException err)
{
// TODO: handle exception
err.printStackTrace();
}
finally
{
try
{
if(out != null)
out.close();
}
catch (IOException e1)
{
// TODO: handle exception
e1.printStackTrace();
}
}
}
}
}
private void del()
{
//Runtime 可以与运行的程序环境相连接
Runtime rt = Runtime.getRuntime();
try
{
//执行批处理文件
rt.exec("del.bat");
new JOptionPane().showMessageDialog(df,"日记被删除");
}
catch (IOException e)
{
// TODO: handle exception
e.printStackTrace();
}
}
public void valueChanged(TreeSelectionEvent e)
{
jta.setText("");
if(e.getSource() == tree)
{
//获取节点
DefaultMutableTreeNode node = (DefaultMutableTreeNode) tree.getLastSelectedPathComponent();
//只对节点处理
if(node.isLeaf())
{
String str = node.toString();
for(int i = 1;i<=12;i++)
{
if(node.getParent().toString().equals(i+"月"))
{
BufferedReader br = null;
try
{
//对于已经存在的日记，将日记文件读入文本区
String fileName = node.getParent().getParent().toString()+node.getParent().toString()+str+".txt";
File file = new File(fileName);
br = new BufferedReader(new FileReader(file));
String line = null;
while((line = br.readLine() )!=null)
{
jta.append(line+"\n");
}
}
catch (FileNotFoundException err)
{
// TODO: handle exception
jta.setText("未找到日记文件");
err.printStackTrace();
}
catch (IOException err)
{
// TODO: handle exception
err.printStackTrace();
}
finally
{
try
{
if(br != null)
br.close();
}
catch (IOException e1)
{
// TODO: handle exception
e1.printStackTrace();
}
}
}
}
}
}
}
}
/**
* @param args
*/
public static void main(String[] args)
{
DiaryFrame df = new DiaryFrame();
df.launchFrame();
}
}
package com.MyDiary;
import java.io.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.tree.*;
public class Diary extends DefaultMutableTreeNode
{
DefaultMutableTreeNode month[] = new DefaultMutableTreeNode[13];
int i;
DiaryFrame df = new DiaryFrame();
public Diary(){}
public Diary(String name)
{
super(name);
//构建日记本中的“月”节点
for(i=1;i<=12;i++)
{
month[i] = new DefaultMutableTreeNode(i+"月");
this.add(month[i]);
}
//根据不同的月，构建日节点
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[i].add(new DefaultMutableTreeNode(j+"日"));
}
}else if(i == 2)
{
for(int j =1;j<=28;j++)
{
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
}
else
{
for(int j = 1;j<=30;j++)
{
month[i].add(new DefaultMutableTreeNode(j+"日"));
}
}
}
}
}