基础深化和提高-IO流技术学习大全

package com.tong; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; public class TestFileByteBuffer { public static void main(String[] args) { long time1 = System.currentTimeMillis(); copyFile("d:/1.jpg","d:/2.jpg"); long time2 = System.currentTimeMillis(); System.out.println(time2 - time1); } /** * * @param source 源文件 * @param destination 目的地文件 */ public static void copyFile(String source,String destination ){ //“后开先关”，try-with-resource按照IO流对象被创建的顺序的逆序来关闭 try(FileInputStream fis = new FileInputStream(source); FileOutputStream fos = new FileOutputStream(destination)){ //创建字节缓冲区 byte[] buffer = new byte[1024]; int temp = 0; while((temp = fis.read(buffer)) != -1){ fos.write(buffer,0,temp); } //将数据从内存中写出到磁盘中 fos.flush(); }catch(IOException e){ e.printStackTrace(); } } }