Java缓冲流高效大文件的复制实例

public class BufferedDemo { public static void main(String[] args) throws FileNotFoundException { // 记录开始时间
long start = System.currentTimeMillis(); // 创建流对象
try ( BufferedInputStream bis = new BufferedInputStream(new FileInputStream("jdk8.exe")); BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("copy.exe")); ){ // 读写数据
int len; byte[] bytes = new byte[8*1024]; while ((len = bis.read(bytes)) != -1) { bos.write(bytes, 0 , len); } } catch (IOException e) { e.printStackTrace(); } // 记录结束时间
long end = System.currentTimeMillis(); System.out.println("缓冲流使用数组复制时间:"+(end - start)+" 毫秒"); } } // 缓冲流使用数组复制时间:666 毫秒