【正文】 ............................. 1 課題的研究背景與意義 ........................................................................................... 1 課題的研究背景 .............................................................................................. 1 課題的研究意義 .............................................................................................. 1 可行性分析 ........................................................................................................... 2 技術(shù)可行性 ..................................................................................................... 2 操作可行性 ..................................................................................................... 2 2 相關(guān)基礎(chǔ)知識以及開發(fā)平臺 ........................................................................................... 2 JAVA 中的多線程與線程安全 ................................................................................... 3 Java 中的多線程 ................................................................................................ 3 Java 中的線程安全 ............................................................................................. 3 Http 協(xié)議簡介 .......................................................................................................... 4 斷點(diǎn)續(xù)傳原理 ......................................................................................................... 4 3 需求分析 ...................................................................................................................... 5 用戶需求分析 .......................................................................................................... 5 業(yè)務(wù)流分析 ............................................................................................................ 6 4. 系統(tǒng)設(shè)計 ..................................................................................................................... 7 系統(tǒng)設(shè)計要點(diǎn) ......................................................................................................... 7 系統(tǒng)總體功能結(jié)構(gòu) .................................................................................................. 7 ....................................................................................................................... 8 用戶界面實(shí)現(xiàn) .......................................................................................................... 8 下載任務(wù)實(shí)現(xiàn) ........................................................................................................11 下載任務(wù)類圖 ..................................................................................................11 下載任務(wù)順序圖 ............................................................................................ 12 下載任務(wù)具體實(shí)現(xiàn) .......................................................................................... 13 監(jiān)控下載信息設(shè)計 ................................................................................................ 18 監(jiān)控下載信息類圖 .......................................................................................... 18 監(jiān)控下載信息順序圖 ...................................................................................... 19 監(jiān)控下載信息實(shí)現(xiàn) .......................................................................................... 19 結(jié) 論 ........................................................................................................................ 22 參考文獻(xiàn) ........................................................................................................................ 23 致 謝 ........................................................................................................................ 25 聲 明 .............................................................................................. 錯誤 !未定義書簽。 關(guān)鍵詞 ： 多線程； 線程安全； 斷點(diǎn)續(xù)傳 The Practice of Java Multithreading and Thread Security Download Tool with Broken/Resume Function based on Abstract In real world, many processes have the characteristic that multistrip 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 prises of downloading task module, setting module and helping system module. With Http support of HttpClient, a subproject of Apache Jakarta Commons, it can download resources ing from web server. The procedure provides the Multithreaded broken/resume functionality, in the process of pletes downloading to use the multithread technology can greatly boost download speed. Keywords: Multithreading。通過 Apache Jakarta Commons 下的子項目 HttpClient 包對 Http 協(xié)議進(jìn)行支持，從而下載服務(wù)器端的資源。為了對 Java 多線程與線程安全機(jī)制進(jìn)行研究與實(shí)踐，特此設(shè)計 一個基于 Http 協(xié)議的支持多線程斷點(diǎn)續(xù)傳的下載 程序 。 多線程是指同時存在幾個執(zhí)行體，按幾條不同的執(zhí)行線