GO语言学习：使用io.copyN实现网络文件传输

一. 首先先看一下io.copy的定义： func CopyN func CopyN(dst Writer, src Reader, n int64) (written int64, err error) CopyN copies n bytes (or until an error) from src to dst. It returns the number of bytes copied and the earliest error encountered while copying. O...阅读全文