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package myio;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;public class IoDemo4 {public static void main(String[] args) throws IOException {FileInputStream fis = new FileInputStream("D:\\你的文件路径\\b.txt");FileOutputStream fos = new FileOutputStream("D:\\你的文件路径\\copy.txt");int b;while (( b = fis.read()) != -1){fos.write(b);}fis.close();fos.close();}
}

弊端和解决方法

FileInputStream一次只能读取一个字节，速度太慢

如果文件过大可以使用多个字节读取

package myio;import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;public class IoDemo4 {public static void main(String[] args) throws IOException {long sta = System.currentTimeMillis();FileInputStream fis = new FileInputStream("D:\\你的文件路径\\ceshi.mp3");FileOutputStream fos = new FileOutputStream("D:\\你的文件路径\\copy.mp3");int len;byte[] bytes = new byte[1024 * 1024 * 5];while ((len = fis.read(bytes)) != -1) {fos.write(bytes, 0, len);}fis.close();fos.close();long end = System.currentTimeMillis();System.out.println(end - sta);}
}