InputStream:定义了字节输入流的抽象类

OutputStream:定义了字节输出流的抽象类;该类所有方法返回void值

FileInputStream:继承InputStream

FileOutputStream:继承OutputStream

package com.tanlei.InputOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;public class FileInputOutputStream {   public static void main(String[] args) {    try {        FileUtil.copyFile(new File("C:\\zhangsan\\tanlei.txt"), new File("D:\\zhangsan.txt"));    } catch (IOException e) {        // TODO Auto-generated catch block        e.printStackTrace();    }}}class FileUtil{    public  static  void  copyFile(File src,File dst) throws IOException {        FileInputStream fis=new FileInputStream(src);        FileOutputStream fos=new FileOutputStream(dst);        long time=System.currentTimeMillis();        int data=-1;        while ((data=fis.read())!=-1) {            fos.write(data);        }        fos.close();        long time2=System.currentTimeMillis();        System.out.println("共花费+"+(time2-time));    }}

缓冲区优化

read(byte[] b) 方法

byte[] buf=new byte[1024*1024];//创建一个1M大小的缓冲区,用来存放输入流中的字节数        long time=System.currentTimeMillis();        int data=0;//用来保存实际读到的字节数        while ((data=fis.read(buf))!=-1) {            fos.write(buf,0,data);        }        fos.close();        long time2=System.currentTimeMillis();        System.out.println("共花费+"+(time2-time));