InputStream:定義了字節輸入流的抽象類

OutputStream:定義了字節輸出流的抽象類;該類所有方法返回void值

FileInputStream:

FileOutputStream:

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("共花費+"+(time2-time));
    }
}

緩沖區優化

 read(byte[] b) 方法

byte[] buf=new byte[1024*1024];//創建一個1M大小的緩沖區,用來存放輸入流中的字節數
        long time=System.currentTimeMillis();
        int data=0;//用來保存實際讀到的字節數
        while ((data=fis.read(buf))!=-1) {
            fos.write(buf,0,data);
        }
        fos.close();
        long time2=System.currentTimeMillis();
        System.out.println("共花費+"+(time2-time));

(四)IO流之InputStream和OutputStream