copyFile

   public static void copyFile(String srcPath, String destPath){
        //1.创建文件
        File src = new File(srcPath);
        File dest = new File(destPath);

        //2.选择流
        InputStream is = null;
        OutputStream os = null;
        try {
            is = new FileInputStream(src);
            os = new FileOutputStream(dest);
            //3.操作
            byte[] flush = new byte[1024];
            int len = -1;//接收长度
            while((len = is.read(flush))!= -1){
                os.write(flush,0,len);
            }
            os.flush();
        }catch (FileNotFoundException e) {
            e.printStackTrace();
        }catch (IOException e){
            e.printStackTrace();
        }finally {
            try {
                //4.释放资源
                if(os!=null)
                    os.close();
            }catch (IOException e){
                e.printStackTrace();
            }
            try {
                if(is!=null)
                    is.close();
            }
            catch (IOException e){
                e.printStackTrace();
            }
        }
    }