用两种方法实现文件的拷贝功能。 ①用FileInputStream/FileOutputStream ②用BufferedInputStream/BufferedOutputStream

以下是两种实现文件拷贝功能的方法：

1.使用FileInputStream/FileOutputStream：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        try {
            FileInputStream input = new FileInputStream("source.txt");
            FileOutputStream output = new FileOutputStream("target.txt");
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = input.read(buffer)) != -1) {
                output.write(buffer, 0, bytesRead);
            }
            input.close();
            output.close();
            System.out.println("文件拷贝成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

2.使用BufferedInputStream/BufferedOutputStream：

import java.io.*;

public class FileCopy {
    public static void main(String[] args) {
        try {
            BufferedInputStream input = new BufferedInputStream(new FileInputStream("source.txt"));
            BufferedOutputStream output = new BufferedOutputStream(new FileOutputStream("target.txt"));
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = input.read(buffer)) != -1) {
                output.write(buffer, 0, bytesRead);
            }
            input.close();
            output.close();
            System.out.println("文件拷贝成功！");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}