自己写的javaGUI记事本

最新推荐文章于 2021-02-25 07:49:23 发布

原创最新推荐文章于 2021-02-25 07:49:23 发布 · 455 阅读

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CC 4.0 BY-SA版权

文章标签：

#java GUI 记事本 IO流

本文介绍了一个使用Java Swing实现的简易记事本程序。该程序包括文件打开与保存功能，并利用JFileChooser进行文件选择。通过BufferedReader和FileWriter实现了文本读写。

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package com.wql.www;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import java.io.*;

public class MyNotePad extends JFrame{

public static void main(String[] args) {

new MyNotePad();

}

JTextArea jta = null;
JMenuBar jmb = null;
JMenu jm = null;
JMenu jm2 = null;
JMenu jm3 = null;
JMenuItem jmi_1 = null;
JMenuItem jmi_2 = null;
public MyNotePad(){
  //添加组件
  this.addComponent();
  //添加监听
  this.addActionListener();

  this.setTitle(this.getTitle());
  this.setDefaultCloseOperation(EXIT_ON_CLOSE);
  this.setSize(800, 600);
  this.setVisible(true);
}

//添加监听
public void addActionListener(){
  jmi_1.addActionListener(new Jmi1Listener());
  jmi_2.addActionListener(new Jmi2Listener());
}
//打开菜单
class Jmi1Listener implements ActionListener{
  @Override
  public void actionPerformed(ActionEvent e) {
   JFileChooser jfc = new JFileChooser();
   jfc.showOpenDialog(null);
   jfc.setVisible(true);
   Jmi1Io(jfc);
  }
}
//保存菜单
class Jmi2Listener implements ActionListener{
  @Override
  public void actionPerformed(ActionEvent e) {
   JFileChooser jfc = new JFileChooser();
   jfc.showSaveDialog(null);
   jfc.setVisible(true);
   Jmi2Io(jfc);

  }
}

public void Jmi1Io(JFileChooser jfc){
  String fileName = jfc.getSelectedFile().getAbsolutePath();
  this.setTitle(fileName);
  FileReader fr = null;
  BufferedReader br = null;
  String tempStr = "";
  String str = "";
  try {
   fr = new FileReader(fileName);
   br = new BufferedReader(fr);
   while((tempStr = br.readLine()) != null){
    str += tempStr + "\r\n";
   }
   jta.setText(str);
  } catch (Exception e) {
   e.printStackTrace();
  }finally {
   try {
    br.close();
    fr.close();
   } catch (Exception e2) {
    e2.printStackTrace();
   }
  }
}
public void Jmi2Io(JFileChooser jfc){
  String fileName = jfc.getSelectedFile().getAbsolutePath();
  FileWriter fw = null;
  BufferedWriter bw = null;
  String str = "";
  try {
   fw = new FileWriter(fileName);
   bw = new BufferedWriter(fw);
   str = jta.getText();
   bw.write(str);
  } catch (Exception e) {
   e.printStackTrace();
  }finally{
   try {
    bw.close();
    fw.close();
   } catch (Exception e2) {
    e2.printStackTrace();
   }
  }
}

//添加组件
public void addComponent(){
  jta = new JTextArea();
  jmb = new JMenuBar();
  jm = new JMenu("文件");
  jm2 = new JMenu("编辑");
  jm3 = new JMenu("关于");
  jmi_1 = new JMenuItem("打开");
  jmi_2 = new JMenuItem("保存");
  this.setTitle("记事本");
  this.setJMenuBar(jmb);
  jmb.add(jm);
  jmb.add(jm2);
  jmb.add(jm3);
  jm.add(jmi_1);
  jm.add(jmi_2);
  this.add(jta);
}
}