文档介绍：摘要
的应用中,数据库和Web 技术的结合是传统MIS (Intrant) 环境的关键, 已有不少厂商推出了各自的产品,但这些产品基本上是实现数据的html 格式输出。在实际应用中,我们经常需要把数据以统计图的形式表现出来,例如股票行情曲线图的输出。传统的方法是把统计图作为一个图形文件放到Web 服务器的目录中。这种做法虽然简单,但有明显的局限性:一是图形文件要占用较大存储空间;二是难以适应灵活复杂的查询要求;三是图形文件随数据库的变化而更新,加重了服务器的负担,也容易造成图形和数据库的不一致。所以本论文讨论APPLET的统计图形的实现,本次主要实现Applet的统计图形:饼形图,柱形(直方)图,线段图,趋势图,甘特图等。
关键词:Applet 统计图形 Java
Abstract:In and applications, databases and Web technology is bination of traditional MIS system migration to the (Intrant) the key to the environment, many manufacturers have launched their own products, but these products are basically the html format for data output . In practical application, we often need to statistical data to map out the forms, such as stock quotes curve of the output. The traditional method is to charts as a graphic file into the Web server directory. While this approach simple, but there are obvious limitations: First, graphics files needed to take up more storage space and the other is difficult to adapt to demands for flexibility in plex; Third, graphics file with the changes in the database updated, adding to the burden on the server , But also easy for the graphics and database inconsistencies. Therefore, the present papers on the statistical graphics APPLET the realization of this main Applet statistical graphics: the pie-shaped map, cylindrical (DSS side) plans, the line map, trends Gantt, and so on.
Keyword:Applet ;Statistics graphics; Java
目录
基于APPLET的统计图形的实现 1
1引言 1
2浏览器/服务器架构中的applet技术 2
2
创建Applet 3
Applet的生命周期 3
4
Applet传递参数 4
4
3. 1 Java虚拟机 6
2. 1. 1 Java虚拟机是什么 6
2. 1. 2 Java虚拟机的生命周期 7
2. 1. 3 Java虚拟机的体系结构 7
4. 统计图概述 11
12
13
14
5 Applet统计图形实现 17
研究展望 19
参考文献 20
基于APPLET的统计图形的实现
1引言
随着互联网技术的高速发展及信息时代的到来,上获得大量的信息,Web数据库的引入更加丰富了网上资源,同时使人们特别是企业单位能够从Web数据库服务器中获得更有价值、更及时、更结构化的信息。然而当这种信息以Web页面的形式反馈给用户时,如何才能使Web页面更加生动,有更好的交互性,更加满足用户的具体需求呢? Java Applet技术正是解决这个问题的最有力的工具之一,它可以嵌