20頁 11600字 設(shè)計(jì)說明書+程序代碼

摘 要 2
Abstract 4
引 言 5
1 技術(shù)簡介 9
1.1 Java語言 9
1.1.4 分布性 10
1.3 Java中輸入/輸出流概念 12
1.5 JBuilder集成開發(fā)環(huán)境介紹 14
2 系統(tǒng)分析 17
2.1 可行性分析 17
2.2 開發(fā)工具 18
2.3 需求分析 18
3 系統(tǒng)詳細(xì)設(shè)計(jì) 19
3.1 系統(tǒng)的主要功能 20

摘 要
隨著計(jì)算機(jī)網(wǎng)絡(luò)技術(shù)的飛速發(fā)展，客戶/服務(wù)C/S(Client/Sersver)結(jié)構(gòu)成為開發(fā)FTP的網(wǎng)絡(luò)編程結(jié)構(gòu)，Java作為Web應(yīng)用程序的開
發(fā)技術(shù)也為更多的人所采用。
起初， FTP并不是應(yīng)用于IP網(wǎng)絡(luò)上的協(xié)議，而是ARPANET網(wǎng)絡(luò)中計(jì)算機(jī)間的文件傳輸協(xié)議， ARPANET是美國國防部組建的老網(wǎng)絡(luò)，于1960-1980年使用。在那時(shí)，F(xiàn)TP的主要功能是在主機(jī)間高速可靠地傳輸文件。目前FTP仍然保持其可靠性，即使在今天，它還允許文件遠(yuǎn)程存取。這使得用戶可以在某個(gè)系統(tǒng)上工作，而將文件存貯在別的系統(tǒng)。例如，如果某用戶運(yùn)行Web服務(wù)器，需要從遠(yuǎn)程主機(jī)上取得HTML文件和CGI程序在本機(jī)上工作，他需要從遠(yuǎn)程存儲(chǔ)站點(diǎn)獲取文件(遠(yuǎn)程站點(diǎn)也需安裝Web服務(wù)器)。當(dāng)用戶完成工作后，可使用FTP將文件傳回到Web服務(wù)器。采用這種方法，用戶無需使用Telnet
登錄到遠(yuǎn)程主機(jī)進(jìn)行工作，這樣就使Web服務(wù)器的更新工作變得如此的輕松。
和Internet上的許多環(huán)境一樣，完整的Java應(yīng)用環(huán)境實(shí)際上也是一個(gè)客戶機(jī)/服務(wù)器環(huán)境，更確切地說是瀏覽器/服務(wù)器模型（即Browser/Server模型，簡稱Web模型）。但與傳統(tǒng)的客戶機(jī)/服務(wù)器(C/S)的二層結(jié)構(gòu)不同，應(yīng)用Java的Web模型是由三層結(jié)構(gòu)組成的。傳
統(tǒng)的C/S結(jié)構(gòu)通過消息傳遞機(jī)制，由客戶端發(fā)出請求給服務(wù)器，服務(wù)器進(jìn)行相應(yīng)處理后經(jīng)傳遞機(jī)制送回客戶端。而在Web模型中，服務(wù)器一端被分解成兩部分：一部分是應(yīng)用服務(wù)器(Web服務(wù)器)，另一部分是數(shù)據(jù)庫服務(wù)器.

關(guān)鍵詞：
FTP；C/S；B/S；JAVA


Abstract
As the computer network technology is developing in a high speed. C/S (Client/Server) has become a FTP network programming structure. Java is
Used moer and more as a Web application program.
In the beginning, FTP was not be used in IP net protocol, but which is used in ARPANET network computers. ARPANET was an old network of the U.S. Department of Defense between 1960s and 1980s.At that period the main function of the FTP is transmitting documents reliably and in high speed between the master computers. At present, it also does very well, furthermore, it permits store or access in telecommuting today. So the users can work on onesystem and store the document in another. For example, someone use the
Web server, and need some HTML document and CGI program on his own computer, and want to acquire some documents, (the telnet need install Web server)When the user finished he can store the document to the Web server by the
FTP. In this way, the user can work without Telnet, which make the Web
server update more and more easier.
The whole Java circumstance actually is a C/S (Client/Server) like the other circumstances on the Internet, strictly to say, it is Browser/Server model (Web model). But it is different from the traditional C/S model that is two layers structure. The Web using Java is three layers structure. The traditional C/Sstructure transmits by the message mechanism. The Client sent a request, and
the Server sent to it after some corresponding manages. But in the Web modelthe Server is separated into two parts, one is the application Server (Web Server); another is database Server.

Keywords:
FTP;C/S;B/S;JAVA


參考文獻(xiàn)
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