帮忙编写一个Java的文本写入和读出的程序,要有可视化的窗口
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发布时间：2022-04-29 19:03
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时间：2022-06-20 05:39
Java源程序：
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.io.*;
public class GUIRWFile extends JFrame implements ActionListener {
JTextArea txtMessage;
JButton btnRead, btnWrite;
public GUIRWFile() {
super("文本读写");
txtMessage = new JTextArea(15, 30);
btnRead = new JButton("读取");
btnWrite = new JButton("写入");
this.setLayout(new FlowLayout());
this.add(new JLabel("文件内容："));
this.add(txtMessage);
this.add(btnRead);
this.add(btnWrite);
btnRead.addActionListener(this);
btnWrite.addActionListener(this);
this.setSize(400, 400);
this.setVisible(true);
this.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
}
public static void main(String[] args) {
new GUIRWFile();
}
@Override
public void actionPerformed(ActionEvent e) {
JButton btn = (JButton)e.getSource();
String fileName = "D:\\test.txt";
if(btn.getText().equals("读取")){
try{
InputStream is = new FileInputStream(fileName);
BufferedReader br = new BufferedReader(new InputStreamReader(is));
String line = null;
StringBuffer buffer = new StringBuffer();
while((line = br.readLine()) != null){
buffer.append(line + "\n");
}
txtMessage.setText(buffer.toString());
br.close();
is.close();
}
catch(Exception ex){
JOptionPane.showMessageDialog(this, "系统I/O错误！");
}
}
else if(btn.getText().equals("写入")){
try{
String msg = txtMessage.getText();
OutputStream os = new FileOutputStream(fileName);
PrintStream ps = new PrintStream(os);
ps.print(msg);
ps.close();
os.close();
}
catch(Exception ex){
JOptionPane.showMessageDialog(this, "系统I/O错误！");
}
}
}
}
运行测试：
