计算机专业 毕业论文)基于Java的HTTP断点续传的设计与实现.doc

 PAGE \* MERGEFORMAT 1 基于Java的HTTP断点续传的设计与实现 【摘 要】随着计算机技术的发展和网络的扩大，现在人们下载的需求也越来越大，希望坐在电脑面前点一点鼠标就可以完成下载，但是目前的下载软件往往差强人意，要么下载速度过慢，要么就是在遇到突发性情况（如停电或网络断开链接），使得下载不得不从新开始，让人们头痛不已。 Java语言的一大特性就是内置对多线程的支持。多线程是指同时存在几个执行体，按几条不同的执行线索共同工作的情况，它使得编程人员可以很方便地开发出具有多线程功能、能同时处理多个任务的功能强大的应用程序。一些同时运行的线程需要共享数据，因此每个线程就必须要考虑其它与它一起共享数据的线程的状态与行为，这就是线程安全的问题。 为了对Java多线程与线程安全机制进行研究与实践以及对HTTP协议的研究，特此设计一个基于HTTP 协议的支持多线程断点续传的下载程序。此下载程序由下载任务模块、设置模块以及系统帮助模块组成。 【关键字】断点续传 java多线程机制 资源下载 Based on Java HTTP breakpoint continuingly design and implementation 【Abstract 】With the development of computer technology and expansion of network, demand for download is increasing now, people hope that the download completed by clicked the mouse sitting in front of the computer , but download software is often unsatisfactory for now, or downloads too slowly, or suffer the sudden circumstances (power failure or network disconnect), the task for download have to start afresh, make people worried. In real world, many processes have the characteristic that multi-strip clue act at the same time. The Java language has a major characteristic of embedded multithread support. Multithreading is the status that exist several implementation body at the same time, according to several different clues to the implementation of the joint work, It means that programmers can easily produce more threads development functions, It can also deal with a number of tasks powerful application. Running some of the threads need to share data, So each thread must consider other with it to share the data with the state of the thread, This is the thread safety. To Java multithreading and security mechanisms to conduct research and practice, Design hereby Http agreement on the support multithreading download procedures. This download procedures comprises of downloading task module, setting module and helping system module. 【Keywords】 Broken/Resume Multithreading Resources Download 目 录  TOC \o 1-3 \h \z \u   HYPERLINK \l _Toc26416790