自动更新系统的开发

自动更新系统的开发
 
摘要：在Internet迅猛发展的今天，自动更新系统有着极其重要的作用。随便看看我们身边的'产品，几乎都有自动更新这个系统，例如Windows Update，杀毒软件的自动升级，网络游戏的经常更新等等。这是我们最为常见的自动更新。所以从各个方面看来，自动更新系统都有着不可估量的价值。                           
本文首先对整个系统作了介绍，然后重点介绍了了文件从不同服务器上下载的方法以及文件下载技术和文件下载的具体实现方法。在各种网络情况下系统如何选择FTP、HTTP、UDP等网络协议进行下载。并在下载过程中，根据网络的实现情况用不同的技术（如多线程技术、传送压缩文件、实现断点传送等）进行自动下载文件。

关键词 自动更新；网络协议；多线程；断点传送
 
The Development of Automatic Updating Controls
 
ABSTRACT：In Internet swift and violent development today, renews the system to have automatically the extremely vital role. Has a look we side product casually, nearly all has renews this system automatically, for example Windows Update, anti-virus software automatic promotion, network game frequent renewal and so on. This is we most common automatic renewal. Therefore looked like from each aspect, renews the system all to have automatically the inestimable value.                         
This article first has made the introduction to the overall system, then introduced with emphasis the document the method as well as the document downloading technology and document downloading which downloaded from the different server concrete realization method. Does the system choose network protocols and so on the FTP, HTTP, UDP how in each kind of network situation carries on downloading. And in the downloading process, according to the network realization situation with the different technology (for example multi-thread technology, transmission compressed file, realizes break point transmission and so on) to carry on the automatic downloading document.

Key words: Automatic renewal; Network protocol; Multithreading; Break point transmission