java利用Swing和IO流实现记事本保存和读取文件

需求：用swing编写一个简易的记事本界面

           用IO流完成保存文件和读取文件的操作

package Chapter06;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;


public class Notepad extends Jframe implements ActionListener {
    //创建组件
    JMenu jm1;
    JMenuBar jmb1;
    Jtextarea jta;
    JMenuItem jmi1;
    JMenuItem jmi2;

    //构造方法实现界面生成
    public Notepad(){
        //创建jta
        jta = new Jtextarea();
        jmb1 = new JMenuBar();
        this.add(jta);
        jm1 = new JMenu("文件");
        this.setJMenuBar(jmb1);
        jmb1.add(jm1);

        jmi1 = new JMenuItem("打开文件");
        jmi1.setActionCommand("open");
        jmi1.addActionListener(this);
        jmi2 = new JMenuItem("保存文件");
        jmi2.setActionCommand("save");
        jmi2.addActionListener(this);

        jm1.add(jmi1);
        jm1.add(jmi2);

        this.setTitle("记事本");
        this.setSize(600,400);
        this.setLocation(400,300);
        this.setVisible(true);
        this.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);
    }
    //本类进行事件处理
    @Override
    public void actionPerformed(ActionEvent e){
        if(e.getActionCommand().equals("save")){
            String filename = "D:\IDEA代码\Home_Work\src\Chapter06\a.txt";
            FileWriter fw = null;
            BufferedWriter bw = null;
            try{
                fw = new FileWriter(filename);
                bw = new BufferedWriter(fw);
                String str = this.jta.getText();
                bw.write(this.jta.getText());
                System.out.println("写入文件成功!");
            }catch(Exception e1){
                e1.printStackTrace();
            }finally {
                try{
                    bw.close();
                    fw.close();
                }catch (IOException e2){
                    e2.printStackTrace();
                }
            }

        }else if(e.getActionCommand().equals("open")){
            String filename = "D:\IDEA代码\Home_Work\src\Chapter06\a.txt";
            FileReader fr = null;
            BufferedReader br = null;

            try{
                fr = new FileReader(filename);
                br = new BufferedReader(fr);
                String line = null;
                String add = "";
                while((line = br.readLine())!=null){
                    add += line + "n";
                }
                this.jta.setText(add);
                System.out.println("读取文件成功!");
            }catch (IOException e1){
                e1.printStackTrace();
            }finally {
                try{
                    br.close();
                    fr.close();
                }catch(IOException e2){
                    e2.printStackTrace();
                }
            }
        }
    }
}
package Chapter06;
//测试类
public class Test {
    public static void main(String[] args) {
        Notepad np = new Notepad();
    }
}

代码敲的不容易，给个三连再走吧！