Java输入输出1文件复制

编写一个程序将当前目录中的a.txt文件中的内容复制到b.txt中。

import java.io.*;public class Main {public static void main(String[] args) {String oldPath="c://a.txt";String newPath="c://b.txt";try {int bytesum = 0;int byteread = 0;File oldfile = new File(oldPath);if (oldfile.exists()) { //文件存在时InputStream inStream = new FileInputStream(oldPath); //读入原文件FileOutputStream fs = new FileOutputStream(newPath);byte[] buffer = new byte[1444];int length;while ( (byteread = inStream.read(buffer)) != -1) {bytesum += byteread; //字节数 文件大小System.out.println(bytesum);fs.write(buffer, 0, byteread);}inStream.close();}}catch (Exception e) {System.out.println("复制单个文件操作出错");e.printStackTrace();}}}