Using the input and output streams knowledge, copy files from the source file path to the destination path

com.itcast.demo02.InputStream Package ; 

Import a java.io.FileInputStream ; 
Import java.io.FileOutputStream ; 
Import java.io.IOException ; 

/ ** 
* @author newcityman 
* @date 2019/7/28 - 9:38 
* topics requirements: 
* using knowledge input and output streams, copying files from the source file path to the destination path 
* / 
public class Demo03InputStream { 
 public static void main (String [] args) throws IOException { 
 Long L = the System. with currentTimeMillis () ; 
FIS = FileInputStream new new FileInputStream ( "D: \\ festival task .docx") ; 
FileOutputStream fos =new FileOutputStream("F:\\1.docx");
 byte[] bytes = new byte[2048];
 int len = 0;
 while((len=fis.read(bytes))!=-1){
 fos.write(bytes,0,len);
 }
 fis.close();
 fos.close();
 long l1 = System.currentTimeMillis();
 System.out.println("总耗时："+(l1-l)+"毫秒");

 }
}