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摘 要
</p>
<p>
即时通讯系统，为两个或多个终端提供通讯服务，
允许两人或者多人通过网络即时传递文字、图片、语音甚至视频，进行信息交流。
通俗的来讲它就是在线聊天，交流的软件。
目前最流行的有 MSN、QQ、UC等。
这些都具有很强的商业化特点。
在现有网络基础上，研究一个安全的、私有的、本区域化的即时通讯工具，
非常有必要。
<a href="results/0_1_7.html" target="resultFrame">
<span class="autotype">Java语言，是目前最为流行的软件开发语言之一，</span>
</a>
它有着简单易用、高性能、跨平台的特点。
本系统采用Java语言和Eclipse为基本开发环境，使用软件重构开发方法，
<a href="results/0_1_10.html" target="resultFrame">
<span class="autotype">对原有系统设计进行了优化，</span>
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利用局域网通信机制的原理（即通过直接继承Thread类来建立多线程），
<a href="results/0_1_12.html" target="resultFrame">
<span class="autotype">实现了网络聊天服务器程序和网络聊天客户程序。</span>
</a>
<a href="results/0_1_13.html" target="resultFrame">
<span class="autotype">Java通过网络通用编程方法——Socket套接字，来建立服务器，</span>
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使得服务器能读取并且应答、转发客户端发来信息。
<a href="results/0_1_15.html" target="resultFrame">
<span class="autotype">Eclipse通过与服务器建立连接，能够实现客户端与客户端的信息交流。</span>
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<p>
本文首先通过局域网聊天软件的背景，研究意义和可行性进行分析，
<a href="results/0_2_1.html" target="resultFrame">
<span class="autotype">展现了局域网聊天软件的前景；</span>
</a>
<a href="results/0_2_2.html" target="resultFrame">
<span class="autotype">然后通过需求分析阐述了本系统的总体结构和需要实现的功能；</span>
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通过对系统的详细设计对系统的总体架构和功能模块进行了具体规划和具体设计；
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<span class="autotype">根据系统的设计建立数据库，创建表；</span>
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通过系统实现的介绍，对该系统具体功能模块的实现过程作一个详细的说明。
<a href="results/0_2_6.html" target="resultFrame">
<span class="autotype">本系统从头到尾，都严格遵循软件开发的基本过程。</span>
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<a href="results/0_3_0.html" target="resultFrame">
<span class="autotype">关键词： 局域网 聊天 Socket 文件传输</span>
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<p>
Abstract
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<p>
Instant messaging is a terminal service
that allows two or more people to use the network instant messaging,
images, voice messages and even video communication. Colloquially,
it is the software of online chatting and communication.
The most popular are MSN, QQ, UC, etc.
These are all very commercial characteristics.
On the basis of the existing network, it is necessary to study a secure,
<a href="results/0_5_7.html" target="resultFrame">
<span class="autotype"> private and regional instant communication tool.</span>
</a>
Java is the more basic and popular development language we currently use,
and it has a simple and easy-to-use feature and performance.
Using Java language and eclipse as the basic development environment,
application refactoring development methods, optimize the system design,
by using the principle of LAN communication mechanism (that is,
through direct inheritance Thread class to build a multi-threaded),
<a href="results/0_5_14.html" target="resultFrame">
<span class="autotype"> implements the network chat server and network chat client program.</span>
</a>
Java sets up the server through Socket sockets,
enabling the server to read and forward messages from the client,
while also refreshing the user list.
Eclipse enables the client to communica
te with the client by establishing a connection with the server.
</p>
<p>
Firstly,
<a href="results/0_6_1.html" target="resultFrame">
<span class="autotype"> this paper analyzes the significance and feasibility of LAN chat software,</span>
</a>
and presents the prospects of LAN chat software.
<a href="results/0_6_3.html" target="resultFrame">
<span class="autotype"> Then the overall structure of the syste</span>
</a>
m and the functions that need to be real
ized are explained by demand analysis.
Through the detailed design of the system,
the overall structure and function modu
les of the system are specifically planned and designed.
Establish database according to system design, create table;
<a href="results/0_6_10.html" target="resultFrame">
<span class="autotype"> Through the introduction of system implementation,</span>
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the realization process of the specific
<a href="results/0_6_12.html" target="resultFrame">
<span class="autotype"> function module of the system is described in detail.</span>
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The system strictly follows the basic p
rocess of software development from beginning to end.
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<p>
Key words: LAN chat Socket file transfer.
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<p>
绪 论
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<p>
1.1课题研究的背景和意义
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<p>
1.1.1课题背景
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<p>
<a href="results/0_11_0.html" target="resultFrame">
<span class="autotype">即时通讯是指能够即时发送�
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