简易java文本编辑器续

最新推荐文章于 2023-09-09 11:03:14 发布

lxy1981

最新推荐文章于 2023-09-09 11:03:14 发布

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分类专栏： java 文章标签：文本编辑 java file exception import string

本文链接：https://blog.youkuaiyun.com/lxy1981/article/details/2419284

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本文介绍了一个使用Java Swing构建的简易文本编辑器，该编辑器具备基本的文件操作功能，如打开、保存及另存为等，并实现了文件路径的选择与文件内容的读写。

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
/**
* Title: 
*
* Description: 
*
* Copyright: Copyright (c) 2008
*
* Company: 
*
* @author not attributable
* @version 1.0
*/
public class Editer extends JFrame implements ActionListener{
 JFrame f;
 JMenuItem menuItemOpen,menuItemSave,menuItemSaveAs,menuItemQuit;
 JTextArea jtTet;
 String directory = "E://";
 String fileName="未命名.txt";

    public Editer() {
        super();
        setTitle(fileName+"--Editer");
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setJMenuBar(createJMenuBar());
        jtTet = new JTextArea(25,40);
        JScrollPane p = new JScrollPane(jtTet);
        getContentPane().add(p);
        setSize(500,500);
        setLocation(200,250);
        setDefaultLookAndFeelDecorated(true);
        setVisible(true);
    }

    public JMenuBar createJMenuBar(){
        JMenuBar file = new JMenuBar();
        JMenu begin = new JMenu("文件");
        menuItemOpen= new JCheckBoxMenuItem("打开");
        begin.add(menuItemOpen);
        menuItemSave = new JCheckBoxMenuItem("保存");
         begin.add(menuItemSave);
         menuItemSaveAs = new JCheckBoxMenuItem("另存为");
         begin.add(menuItemSaveAs);
        menuItemQuit = new JCheckBoxMenuItem("退出");
         begin.add(menuItemQuit);
         menuItemOpen.addActionListener(this);
         menuItemSave.addActionListener(this);
         menuItemSaveAs.addActionListener(this);
         menuItemQuit.addActionListener(this);
         file.add(begin);
         JMenu help = new JMenu("帮助");
         file.add(help);
        return file;
    }

//此处加入代码
//实现将文件内容读取到文本编辑器中

//解决java回车换行问题，防止写入错误
    public void openFile(File openFile){
     try{
       String text ;
       BufferedReader in = new BufferedReader(new FileReader(openFile));
       while((text=in.readLine())!=null){
           jtTet.append(text);
           jtTet.append("/r/n");
            }
            in.close();
        }catch(IOException ex){
                 System.out.println("io exception!");
        }

}

    //此处加入代码
    //实现将文本编辑器中内容写入到文件中
    public void saveFile(File openFile){
          try{
             // BufferedWriter out = new BufferedWriter(new FileWriter(
             //              openFile));
             FileWriter out = new FileWriter(openFile);
             out.write(jtTet.getText());
              out.close();
                }catch(IOException ex){
                    System.out.println("io exception!");
           }

}

public void actionPerformed(ActionEvent e){

if(e.getSource() == menuItemOpen){

            FileDialog myFileDialog = new FileDialog(this,"打开",FileDialog.LOAD);
            myFileDialog.setLocation(250,250);
            myFileDialog.setDirectory(directory);
            myFileDialog.show();

            directory = myFileDialog.getDirectory();
            fileName = myFileDialog.getFile();
            myFileDialog.dispose();

jtTet.setText("");

            File openFile = new File(directory,fileName);
            if(! openFile.exists()){
                JOptionPane.showMessageDialog(null,"文件不存在！");
            }
            else
            {
                setTitle(fileName+"--Editer");
                openFile(openFile);

            }
       }
        if(e.getSource() == menuItemSave){

File openFile = new File(directory,fileName);
saveFile(openFile);

}
if(e.getSource() == menuItemSaveAs){

            FileDialog myFileDialog = new FileDialog(this,"另存为",FileDialog.SAVE);
            myFileDialog.setLocation(250,250);
            myFileDialog.setDirectory(directory);
            myFileDialog.show();

directory = myFileDialog.getDirectory();
fileName = myFileDialog.getFile();

myFileDialog.dispose();

            File openFile = new File(directory,fileName);
            saveFile(openFile);
            setTitle(fileName+"--Editer");

}

        if(e.getSource() == menuItemQuit){
           System.exit(0);
        }
    }

    public static void main(String[] args) {
       Editer f = new Editer();
    }