请编写程序，分别使用字节流和字符流拷贝一个文本文件。要求如下： 1.使用FileInputStream、FileOutputStream和FileReader、FileWriter分别进行拷贝。 2.使用字节流拷贝时，定义一个长度为1024的字节数组作为缓冲区；使用字符流进行拷贝时，使用BufferedReader和BufferedWriter包装流进行包装。

使用字节流拷贝：

import java.io.*;

public class FileCopyByteStream {
    public static void main(String[] args) {
        String sourcePath = "source.txt";
        String destPath = "dest.txt";

        try {
            FileInputStream fis = new FileInputStream(sourcePath);
            FileOutputStream fos = new FileOutputStream(destPath);

            byte[] buffer = new byte[1024];
            int len;
            while ((len = fis.read(buffer)) != -1) {
                fos.write(buffer, 0, len);
            }

            fis.close();
            fos.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

使用字符流拷贝：

import java.io.*;

public class FileCopyCharStream {
    public static void main(String[] args) {
        String sourcePath = "source.txt";
        String destPath = "dest.txt";

        try {
            FileReader fr = new FileReader(sourcePath);
            BufferedReader br = new BufferedReader(fr);

            FileWriter fw = new FileWriter(destPath);
            BufferedWriter bw = new BufferedWriter(fw);

            char[] buffer = new char[1024];
            int len;
            while ((len = br.read(buffer)) != -1) {
                bw.write(buffer, 0, len);
            }

            br.close();
            bw.close();

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}