字节流FileInputStream FileOutputStream四种读写，包装流BufferedOutputStream BufferedInputSream 缓冲区默认8192字节

package test03;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class Streamtest {
    public static void main(String[] args) throws IOException {
        long start = System.currentTimeMillis();
        //test1();//2421
        //test2();//8
//        test3();//52
        test4();//6
        System.out.println(System.currentTimeMillis()-start);
    }
    //基本字节流,一次读写一个字节
    public static  void test1() throws IOException {
        //封装源文件
        FileInputStream fis = new  FileInputStream("G:/Lighthouse.jpg");
        //封装目标文件
        FileOutputStream fos = new FileOutputStream("G:/demo/lighthouse01.jpg");
        //读写
        int b = 0;
        while((b = fis.read())!=-1) {
            fos.write(b);
        }
        //关闭资源
        fis.close();
        fos.close();
    }
    //基本字节流   一次一个字节数组
    public static void test2() throws IOException {
        FileInputStream fis = new FileInputStream("G:/Lighthouse.jpg");
        FileOutputStream fos = new FileOutputStream("G:/demo/lighthouse02.jpg");
        
        //读写
        int len =0;
        byte[] bys = new byte[1024];
        while((len = fis.read(bys))!=-1) {
            fos.write(bys);
        }
        //关闭资源
        fis.close();
        fos.close();
    }
    //缓冲字节流 一次一个字节
    public static void test3() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("G:/Lighthouse.jpg"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("G:/demo/lighthouse03.jpg"));
        //读写
        int b = 0;
        while((b = bis.read())!=-1) {
            bos.write(b);
        }
        bis.close();
        bos.close();
        
    }
    //缓冲字节流 一次一个字节数组
    public static void test4() throws IOException {
        BufferedInputStream bis = new BufferedInputStream(new FileInputStream("G:/Lighthouse.jpg"));
        BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream("G:/demo/lighthouse04.jpg"));
        //读写
        int len = 0;
        byte[] bys = new byte [1024];
        while((len = bis.read(bys))!=-1) {
            bos.write(bys);
        }
        bis.close();
        bos.close();
        
                
        
    }
    
}