filedemo1.java

一个JAVA小程序

import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class FileDemo1 extends JFrame implements ActionListener
{
private JTextArea inputTextArea;
private JButton saveButton;
private JLabel label;
private FileOutputStream outFile;
public FileDemo1()
{
Container container=getContentPane();
container.setLayout(new FlowLayout());
label=new JLabel("输入你要保存的文本:");
label.setForeground(Color.red);
container.add(label,BorderLayout.NORTH);
inputTextArea=new JTextArea(" ",10,20);
inputTextArea.setEditable(true);
container.add(new JScrollPane(inputTextArea),BorderLayout.CENTER);
saveButton=new JButton("保存");
container.add(saveButton,BorderLayout.SOUTH);
saveButton.addActionListener(this);
setSize(300,300);
setVisible(true);
}
public void actionPerformed(ActionEvent event)
{
if(event.getSource()==saveButton)
{
try{
outFile=new FileOutputStream(new File("text.txt"));
outFile.write(inputTextArea.getText().getBytes(),0,inputTextArea.getText().length());
outFile.close();
JOptionPane.showMessageDialog(this,"已保存为text.txt文本文件!");
}
catch(IOException e)
{
JOptionPane.showMessageDialog(this,"Error when writing to file or closing the file !","Error",JOptionPane.ERROR_MESSAGE);
System.exit(1);
}
}
}
public static void main(String[] args)
{
FileDemo1 fileDemo1=new FileDemo1();
fileDemo1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}