今天的作业 java IO练习，一个山寨记事本，没什么技术含量

/*
* 2011 08 29 java IO操作小练习
* Notepad 山寨记事本
*
×很多人都写过的东西，没记错的话已经是第二次写了吧，没什么技巧，也没什么算法，纯属熟悉程序的练手，一直想写一个完整的，还是先把作业交了再说吧
×一直想把程序尽量规范起来，希望能进步快点
× blog:blog.youkuaiyun.com/hack2me
* blog: youngershen.com/blog 需要翻墙
* email:younger.x.shen@gmail.com
*/




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

public class NotePad extends JFrame{

		private  JMenu menu = null;
		private  JMenuBar bar = null;
		private  JMenuItem open = null;
		private  JMenuItem save = null;
		private  JMenuItem saveAs = null;
		private  JTextArea editArea = null;

		private BufferedReader reader = null;
		private BufferedWriter writer = null;
		private ArrayList<String> dumpString = new ArrayList<String>();
		private String fileName = null;
		private String buffer = null;
		private JFileChooser chooser = new JFileChooser();
		private File currentFile = null;
		private ArrayList<String> currentText = new ArrayList<String>();

		//成员初始化
		public NotePad(){
		
			super("NotePad By Younger.shen 20110829");
			menu = new JMenu("菜单");
			bar = new JMenuBar();
			open = new JMenuItem("打开");
			save = new JMenuItem("保存");
			saveAs = new JMenuItem("另存为");
			editArea = new JTextArea();
			setDefaultCloseOperation(EXIT_ON_CLOSE);
			
			initUI();
			getInit();
		}
	
		//事件初始化
		private void getInit(){
			
				saveAs.addActionListener(new ActionListener(){
	
							public void actionPerformed(ActionEvent e){
					
							System.out.println("click the save button");
							chooser.setDialogTitle("保存文件");
							chooser.setDialogType(JFileChooser.SAVE_DIALOG);
							chooser.setCurrentDirectory(new File("./"));
							int flag = 0;
							
							try{
							
								 flag = chooser.showSaveDialog(null);
							
							}catch (HeadlessException ex){

								System.out.println("保存文件错误");
							}
						
							if(JFileChooser.APPROVE_OPTION == flag){
						
								File temp = chooser.getSelectedFile();
								fileName = temp.getName();
								dumpToFile();
						
							}
						}
					});

			save.addActionListener(new ActionListener(){
			
					public void actionPerformed(ActionEvent e){
					
					//add later	
					}
				
			});
			open.addActionListener(new ActionListener(){
			
			
					public void actionPerformed(ActionEvent e){
					
						chooser.setDialogTitle("打开文件");
						chooser.setDialogType(JFileChooser.OPEN_DIALOG);
						int flag = 0;

						chooser.setCurrentDirectory(new File("./"));
						try{
							
							 flag = chooser.showOpenDialog(null);
						}catch (HeadlessException ex){

							System.out.println("保存文件错误");
						}
						if(JFileChooser.APPROVE_OPTION == flag){
						
							currentFile = chooser.getSelectedFile();
							fileName = currentFile.getName();
							ArrayList<String> t = openFile(fileName);

							for(int i=0;i<t.size();i++){
						
									editArea.append(t.get(i));
									editArea.append("\n");
							}
						}
					}
			});
		}
		
		//文件打开操作
		private ArrayList<String> openFile(String name ){
		
			
			try{
			
				reader = new BufferedReader(new FileReader(name));

				String temp = reader.readLine();

				while(temp != null){
		

					currentText.add(temp);

					temp = reader.readLine();
		
				}
				

		
		}catch(IOException e){
			
			
				System.out.println(e.toString());


			}finally{
			
					if(reader!=null){

						try{
						
								reader.close();

						}catch(IOException e){
						
							System.out.println("IO Error");
						}
					}
			
			}
				
				
		return currentText;
		
		
		}
		//UI初始化
		private void initUI(){
		

			bar.add(menu);
			menu.add(open);
			menu.add(save);
			menu.add(saveAs);
			setJMenuBar(bar);
			setLayout(null);
			add(editArea);
			editArea.setBounds(0,0,400,300);
			setVisible(true);
			setResizable(false);
			setSize(400,300);
			add(chooser);

		

			editArea.setEnabled(true);
			
			JScrollPane jScrollPane = null;	
			JPanel jContentPane = new JPanel();
			jScrollPane = new JScrollPane();
			jContentPane.setLayout(null);
            jContentPane.add(jScrollPane, null);
            jScrollPane.setBounds(new Rectangle(0, 2, 400, 300));
            jScrollPane.setViewportView(editArea);
			setContentPane(jContentPane);
				
}

		//聚集字符串的工具方法
		private void gatherString(){
	
				
				buffer = editArea.getText();
		
		}
	
		
	//保存成文件
	public void dumpToFile(){
	
		
		gatherString();

	try{
			writer = new BufferedWriter(new FileWriter(fileName,true));
	
	
	
			writer.write(buffer,0,buffer.length());
			writer.write("\r");
			writer.write("\n");
	
			writer.flush();
		
	}catch(IOException e){
	
	
			System.out.println("dump error");
	
	}finally{
	
		try{

			writer.close();
		
		}catch(IOException e){
		
			System.out.println("IO Error");	
		}
	}
}

	//主方法这个不用看了
	public static void main(String[] args){
	
	
		new NotePad();
	}

}