I梧 州 学 院毕 业 论 文论文题目 局域网内多媒体教学系统的研究与实现 系 别 计算机与电子信息工程系 专 业 计算机科学与技术 班 级 学 号 学生姓名 指导教师（签名） 完成时间 2009 年 5 月II摘要随着我国计算机科学技术的迅速发展，多媒体教学已经成为现代教育的重要组成部分，教育信息化势在必行，网络多媒体教学正在逐渐成为主流的教育形式。网络多媒体教学为学习者提供了更为丰富、优质的学习资源，对提高教学质量、转变教学观念以及推进全民教育产生积极影响。本课题针对本校计算机教室的教学和管理需要，设计并实现了一个局域网内多媒体教学系统。在屏幕广播功能上，采用 java.util.Robot 类来进行全屏捕捉，捕捉后的桌面图片以 JPEG 的格式进行存储，并在存储的过程中进行了快速压缩，在确保图片质量的同时降低传输的信息量，解决了现有的商业化网络教学系统广播时网速卡的问题；在屏幕录制功能上，采用 Robot 类来完成对屏幕的捕获；在多媒体数据压缩技术上，根据不同的媒体信息的特性采用了不同的压缩方式；在提交作业功能上，通过应用层协议，用 UDP 方式把要上交的作业高效率地传到教师端。本系统实现了屏幕广播、屏幕录制、屏幕回放、教师端发布作业和学生端提交作业等功能, 并且测试结果表明，本系统取得了广播延时小、发送文件速度快、系统运行稳定的效果。关键词：局域网 多媒体教学系统 屏幕广播 屏幕录制IIIThe research and implement of Multimedia Teaching System on local area networkAbstractAlong with the rapid development of computer science technology in our country， the multimedia teaching already became the important constituent of the modern education，the education informationization imperative, the network multimedia teaching were becoming the gradually education form of the mainstream.The network multimedia teaching have provided richly, the high quality study resources for the learner, to improves the quality of teaching, the transformation teaching idea as well as advances to educate all the people has the positive influence.This topic in view of the school computer engine room teaching and the management need, designed and has realized in a local area network the multimedia teaching system.In the function of the screen broadcast,use the java.util.Robot to carries on entire screen capture, after the capture tabletop image carries on the memory by the JPEG form, and has carried on the fast compression in the memory process, while guarantees the quality of picture to reduce the transmission the information content, has solved when the existing commercialization network teaching system broadcast network card question; In the function of screen transcribing,use in Java JDK1.4 the Robot to complete to the screen capture; In the multimedia data compression technology, has selected the different compression method according to the different media information characteristic; In the submission job function, through the application layer agreement, the work high efficiency which must deliver passes to the teacher with the UDP way to send.This system has completed the screen broadcast, screen transcribing, screen playbacking， the teacher is held announcing school assignment and the student is held submitting school assignment and so on.and indicated of the test result, this system has obtained the broadcast time delay slightly, the transmission document fast, the system movement stable effect.Keyword: Local Area Network Multimedia Teaching System ScreenbroadcastScreenbranscribingIV目录第一章 绪论 .11.1 开发背景 .11.2 当前多媒体教学系统技术现状 .11.3 选题的意义 .31.4 课题目标 .3第二章 系统开发于相关技术 .52.1 Java 语言与开发工具 .52.2 本系统采用的图像压缩算法 .5第三章 多媒体教学平台的设计 .73.1 需求分析 .73.2 系统基本结构 .83.3 协议设计的模型 .9第四章 多媒体教学平台的实现 .114.1 屏幕录制 .114.2 屏幕播放 .134.3 教师机与学生机的连接 .144.4 屏幕广播 .164.5 教师端发布作业 .214.6 学生端提交作业 .24第五章 软件测试过程 .