12 javaIO流---文件拷贝【字节流实现】

public class FileCopy {
    public static void main(String[] args) {
        //    任务要求：完成文件拷贝
//        将E盘aba目录下的a.txt文件拷贝到 abb目录下
        FileInputStream fileInputStream = null;
        FileOutputStream fileOutputStream = null;
        //定义路径
        String path1 = "E:/aba/a.txt";
        String path2 = "E:/abb/b.txt";
        try {
//            创建对象
            fileInputStream = new FileInputStream(path1);
            fileOutputStream = new FileOutputStream(path2);
//            读取文件
//                定义一个字节数组,提高读取效率
            byte buf []= new byte[1024];
            int readLend = 0;
            while ((readLend=fileInputStream.read(buf)) != -1){
//                读取到后就写入path2，通过fileOutputStream写
                fileOutputStream.write(buf,0,readLend);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
        finally {
            try {
                if (fileInputStream != null){
//                    关闭输入流资源                    
                    fileInputStream.close();
                }
                if (fileOutputStream != null){
//                    关闭输出流资源                    
                    fileOutputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        }
    }