本文翻译自新近Wrox出版社出版的，由Peter van de Put所著的《Professional.iOS.Programming》。该书题材比较新颖，结构合理，是一本不错的IOS开发书籍。本文译自该书第八章《Using FTP》。本文开放使用，不局限于转载、修改、增删，引用，请保留出处说明。禁止任何商业用途。欢迎任何修改建议。

本章有哪些内容？

Ø  理解文件传输协议

Ø  开发一个简单FTP客户端

Ø  实现网络流（Network streams）

WROX.COM CODE DOWNLOADS FOR THIS CHAPTER

The wrox.com code downloads for thischapter are found at www.wrox.com/go/proiosprog on the Download Code tab. Thecode is in the Chapter 8 download and individually named according to the namesthroughout the chapter.

在第七章，你已经学习了网络部分，包括从web服务器下载文件，向RESTful和SOAP服务器发送post请求。在某些情况下，你可能还需要处理视频之类的大文件，下载到你的应用或者上传到服务器进行处理。

你可以将图片或者PDF文件编码成base64字符串，然后发送给服务器，但是这不是十分高效、迅速的方法。创建base64字符串需要花费很长时间，然后你仍然要传输这些数据。

文件传输协议FTP是一个用于FTP服务器和客户端之间进行通信的协议。

开发一个FTP客户端

为IOS应用开发一个FTP客户端的同时，你应当了解一些FTP协议的基本要素。客户端使用预先确定端口上的Internet连接来创建到服务器的连接。默认地，一个FTP系统配置使用以下端口：

Ø  端口20用于服务器创建到客户端的连接

Ø  端口21用于客户端创建到服务器的连接^注

译注：控制连接以通常的客户服务器方式建立。服务器以被动方式打开众所周知的用于F T P 的端口(21),等待客户的连接。客户则以主动方式打开TCP端口21,来建立连接。控制连接始终等待客户与服务器之间的通信。该连接将命令从客户传给服务器, 并传回服务器的应答。

FTP服务器的配置可以有所不同，所以你同意FTP服务器管理员关于使用那个端口就很重要了。

除了对某个端口号用于建立网络流达成一致外，FTP协议预定义了交换的命令，因此客户端可以告诉服务器它需要什么，反过来也一样。最常用的命令包括：

Ø  open：打开一个连接

Ø  close：关闭一个连接

Ø  get：从服务器拷贝一个文件到客户端（下载）

Ø  mget：从服务器拷贝多份文件到客户端（下载）

Ø  put：从客户端拷贝一个文件到服务端（上传）

Ø  mput：从客户端拷贝多份文件到服务端（上传）

Ø  delete：从当前远端目录删除一个文件

Ø  cd：改变服务器上的目录（由客户端发起）

Ø  lcd：改变客户端上的目录

Ø  mkdir或者mkd：在服务端创建一个目录（由客户端发起）

如果你以前从来没用过FTP客户端，你可以从http://filezilla-project.org/下载FileZilla项目。FileZilla是一个开源的FTP客户端和服务端，可用于分析在客户端和服务端两者之间交换的特定的命令。

根据你应用的需求，你有两个基本的选项要考虑。如果你仅仅是从FTP服务端上传或者下载文件，你可以使用由CFNetwork提供的高层API。这个方案能力有限，确定地说不是一个完整的FTP客户端。

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