【年少的风】文件信息的读取与写入

 

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

public class FileGUI extends JFrame {
    JFrame frame = new JFrame();
    static Container container;
    JTextField tfPath;
    JTextArea taText;

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

    public void myFrame() {
        frame = new JFrame("读取和写入数据");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel1 = new JPanel();
        JPanel panel2 = new JPanel();

        taText = new JTextArea(15, 30);
        JLabel lable = new JLabel("文件所在目录：");
        tfPath = new JTextField(20);
        JButton btOpen = new JButton("打开");
        btOpen.addActionListener(new MyListener(this));
        JButton btSave = new JButton("保存");
        btSave.addActionListener(new MyListener(this));

        panel1.setLayout(new BorderLayout());
        panel1.add(taText);
        panel1.add(new JScrollPane(taText));

        panel2.add(lable);
        panel2.add(tfPath);
        panel2.add(btOpen);
        panel2.add(btSave);

        frame.add(panel1, BorderLayout.CENTER);
        frame.add(panel2, BorderLayout.SOUTH);

        frame.setSize(600, 400);
        frame.setVisible(true);
    }
}

class MyListener implements ActionListener {

    FileGUI f = new FileGUI();

    MyListener(FileGUI f) {
        this.f = f;
    }

    public void actionPerformed(ActionEvent e) {

        if (e.getActionCommand().equals("打开")) {
            JFileChooser chooser = new JFileChooser();
            int returnVal = chooser.showOpenDialog(FileGUI.container);

            if (returnVal == JFileChooser.APPROVE_OPTION) {

                String str = chooser.getSelectedFile().getPath();
                f.tfPath.setText(str);
                try {
                    File file = new File(str);
                    int num = (int) file.length();
                    char[] ch = new char[num];
                    FileReader fr = new FileReader(str);
                    while ((fr.read(ch)) != -1) {

                        String temp = new String(ch);
                        f.taText.setText(temp);
                    }
                    fr.close();
                } catch (Exception ee) {
                    f.taText.setText(ee.toString());
                }
            }
        }

        if (e.getActionCommand().equals("保存")) {

            String filePath = f.tfPath.getText();
            String fileContent = f.taText.getText();
            try {
                FileWriter fw = new FileWriter(filePath);
                fw.write(fileContent);
                JOptionPane.showMessageDialog(null, "数据写入成功", "成功提示对话框",
                        JOptionPane.INFORMATION_MESSAGE);
                f.taText.setText("");
                fw.close();
            } catch (Exception eee) {
                f.taText.setText(eee.toString());
            }
        }
    }
}