java--IO--资源拷贝

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
public class test{
        public static void main(String[]args) throws Exception{
               String sourceFilePath="C:\\Users\\wuxueping\\Desktop\\1.jpg";
               String destFilePath="C:\\Users\\wuxueping\\Desktop\\2.jpg";
               copyFile(sourceFilePath,destFilePath);
        }
        public static void copyFile(String sourceFilePath,String destFilePath) throws Exception{
       File sourceFile=new File(sourceFilePath);
       File destFile=new File(destFilePath);
       InputStream in=new FileInputStream(sourceFile);
       OutputStream out=new FileOutputStream(destFile);
       int len=0;
       byte[]data=new byte[1024];
       long start=System.currentTimeMillis();
       while((len=in.read(data))!=-1){
               out.write(data,0,len);
       }
       long end=System.currentTimeMillis();
       System.out.println("共耗时："+(end-start)+"毫秒");
        }
}