java复制文件方法

import java.io.*;
import java.util.*;

public class test
{
        public static void main(String args[]) throws Exception
        {
                File file1 = new File("a.out");
                File file2 = new File("b.out");
                file2.createNewFile();
                FileInputStream in = new FileInputStream(file1);
                FileOutputStream out = new FileOutputStream(file2);

                while (true)
                {
                        try
                        {
                                byte[] data = new byte[1024];
                                int nread;

                                nread = in.read(data, 0, 1024);
                                out.write(data, 0, nread);
                        }
                        catch(Exception e)
                        {
                                break;
                        }
                }

                in.close();
                out.close();
        }
}