filechooserdemo.java

一个简单的文本编辑器,模趽msword写的哈!

package chapter14;
import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
import java.io.*;

public class Filechooserdemo implements ActionListener{
    JFrame f=null;
    JLabel label=null;
    JTextArea textarea=null;
     JFileChooser filechooser=null;
     public Filechooserdemo(){
    	 f=new JFrame("filechooser example");
    	 textarea=new JTextArea();
    	 JScrollPane scrollpane=new JScrollPane(textarea);
    	 JPanel panel=new JPanel();
    	 JButton button1=new JButton("new");
    	 button1.addActionListener(this);
    	 JButton button2=new JButton("save");
    	 button2.addActionListener(this);
    	 panel.add(button1);
    	 panel.add(button2);
    	 label=new JLabel();
    	 filechooser=new JFileChooser("E://");
    	 Container contentpane=f.getContentPane();
    	 contentpane.add(label,BorderLayout.NORTH);
    	 contentpane.add(scrollpane,BorderLayout.CENTER);
    	 contentpane.add(panel,BorderLayout.SOUTH);
    	 f.pack();
    	 f.setVisible(true);
    	 f.addWindowListener(new WindowAdapter(){
    		 public void windowClosing(WindowEvent e){
    			 System.exit(0);
    		 }
    	 });
     }
	public static void main(String[] args) {
	    new Filechooserdemo();

	}
	public void actionPerformed(ActionEvent e){
		File file=null;
		int result;
		if(e.getActionCommand().equals("new")){
			filechooser.setApproveButtonText("ok");
			filechooser.setDialogTitle("open new file");
			result=filechooser.showOpenDialog(f);
			textarea.setText("");
			if(result==filechooser.APPROVE_OPTION){
				file=filechooser.getSelectedFile();
				label.setText("the file you chooser is:"+file.getName());
			}
			else if(result==filechooser.CANCEL_OPTION){
				label.setText("you don not chooser file");
			}
			FileInputStream fileinput=null;
			if(file!=null){
				try {
					fileinput=new FileInputStream(file);
				} catch (FileNotFoundException e1) {
					e1.printStackTrace();
				}
				int readbyte;
				try {
					while((readbyte=fileinput.read())!=-1){
						textarea.append(String.valueOf((char)readbyte));
					}
				} catch (IOException e1) {
					e1.printStackTrace();
				} finally{
					try {
						fileinput.close();
					} catch (IOException e1) {
						e1.printStackTrace();
					}
				}
				
			}
		}
		if(e.getActionCommand().equals("save")){
			result=filechooser.showSaveDialog(f);
			file=null;
			String filenane;
			if(result==filechooser.APPROVE_OPTION){
				file=filechooser.getSelectedFile();
				label.setText("the file name you save is"+file.getName());
			}
			else if(result==filechooser.CANCEL_OPTION){
				label.setText("yon don not have saved any file");
			}
			OutputStreamWriter fileoutput=null;
			try {
				fileoutput=new OutputStreamWriter(new FileOutputStream(file));
			} catch (FileNotFoundException e1) {
				e1.printStackTrace();
			}
			String content=textarea.getText();//这个与textpane中得document.gettext()中得参数不一样得。
		    try {
				fileoutput.write(String.valueOf(content.getBytes()));
			} catch (IOException e1) {
				e1.printStackTrace();
			}
			finally{
				try {
					fileoutput.close();
				} catch (IOException e1) {
					e1.printStackTrace();
				}
			}
		}
	}

}