jtest.java

利用触发事件实现文件输入输出功能

import javax.swing.JButton;
import javax.swing.JTextArea;
import java.awt.Container;
import javax.swing.JFrame;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.Scanner;
import javax.swing.JScrollPane;
public class Jtest extends JFrame {
	JButton b1;
	JButton b2;
	JTextArea ta;
	JScrollPane sp;
	public Jtest()
	{
		super("测试程序");
		b1=new JButton("读取数据");
		b2=new JButton("写入数据");
		ta=new JTextArea(5,8);
		sp=new JScrollPane(ta);
		Container c=getContentPane();
		c.setLayout(new FlowLayout());
		c.add(b1);
		c.add(b2);
		c.add(sp);
		
		b1.addActionListener(new ActionListener()
		{
			Scanner in=new Scanner(System.in);
			String name=in.nextLine();
			public void actionPerformed(ActionEvent e)
			{
				int temp;
				int count=0;
				try{
				DataInputStream f=new DataInputStream(new FileInputStream(name));
				temp=f.readInt();
				while(count<10)
				{
					
					ta.setText(String.valueOf(temp));
					count++;
				}
				}catch(IOException e1)
				{
					e1.printStackTrace();
				}
			}	
		}
		);
		b2.addActionListener(new ActionListener()
		{
			public void actionPerformed(ActionEvent e)
			{
				String s=ta.getText();
				try{
					DataOutputStream f=new DataOutputStream(new FileOutputStream("out.txt",true));
					f.writeBytes(s);
				}catch(IOException e1)
				{
					e1.printStackTrace();
				}
				
			
			}
		}
		);
		
	}
	
	public static void main(String args[])
	{
		Jtest test=new Jtest();
		test.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		test.setSize(300, 200);
		test.setVisible(true);
	}

}