package Copy;

import java.io.BufferedInputStream;

import java.io.BufferedOutputStream;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.IOException;

/*

 * 文件复制方式，字节流，一个4个方式

 * 1.字节流读写单个字节

 * 2.字节流读写字节数组

 * 3.字节缓冲区读写单个字节

 * 4.字节缓冲区读写字节数组

 */

public class Copy {

    public static void main(String[] args) throws IOException {

        long s=System.currentTimeMillis();

        copy_4(new File("E:\\应用软件\\vm.exe"),new File("c:\\vm.exe"));

        long e=System.currentTimeMillis();

        System.out.println(e-s);

    }

    /*

     * 方法：实现文件复制

     *     4.字节流缓冲区流读写字节数组

     */

    public static void copy_4(File src,File desc)throws IOException{

        BufferedInputStream bis=new BufferedInputStream(new FileInputStream(src));

        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(desc));

        int len=0;

        byte[] bytes=new byte[1024];

        while((len=bis.read(bytes))!=-1){

            bos.write(bytes,0,len);

        }

        bos.close();

        bis.close();

    }

    /*

     *    方法：实现文件复制

     *     3，字节流缓冲区流读写单个字节

     */

    public static void copy_3(File src,File desc)throws IOException{

        BufferedInputStream bis=new BufferedInputStream(new FileInputStream(src));

        BufferedOutputStream bos=new BufferedOutputStream(new FileOutputStream(desc));

        int len=0;

        while((len=bis.read())!=-1){

            bos.write(len);

        }

        bos.close();

        bis.close();

    }

    /*

     * 方法:实现复制

     *     2.字节流读写字节数组

     */

    public static void copy_2(File src,File desc)throws IOException{

        FileInputStream fis=new FileInputStream(src);

        FileOutputStream fos=new FileOutputStream(desc);

        int len=0;

        byte[] bytes=new byte[1024];

        while((len=fis.read(bytes))!=-1){

            fos.write(bytes,0,len);

        }

        fos.close();

        fis.close();

    }

    /*

     * 方法：实现文件复制

     * 1.字节流读写单个字节

     */

    public static void copy_1(File src,File desc) throws IOException{

        FileInputStream fis=new FileInputStream(src);

        FileOutputStream fos=new FileOutputStream(desc);

        int len=0;

        while((len=fis.read())!=-1){

            fos.write( len);

        }

        fos.close();

        fis.close();

    }

}