基于DWR的正向和逆向Ajax技术研究及应用
DWR是一个Java库，它尽可能简单地使在服务器Java和在浏览器的javascript进行互动和相互调用。DWR的主要特点是逆向Ajax技术，使服务器能主动向Web客户端的特定页面发送消息，而不是等待请求再相应请求的工作模式。这种工作模式对于拥有大量Web客户端的系统具有高效、简便的特点，其中最典型的是消息推送。
基于DWR的正向和逆向Ajax技术主要应用在web聊天室和紧急消息推送两个方面。通过DWR技术，服务器很好的将消息或者数据即时推送给客户端，而不再要通过客户端不断的刷新页面访问服务器端是否有新的消息和数据。
关键词 web，DWR，javascript，聊天，即时推送，服务器
毕业设计说明书（毕业论文）外文摘要
Title Forward and reverse Ajax-based technology research and application of DWR
Abstract
Traditional model of Web system client makes a request, the server response manner, the server can not take the initiative to send a request (message) to the client. This approach does not meet the needs of many real-world applications, a good solution to this problem based on DWR Reverse Ajax techniques.
DWR is a Java library that enables Java on the server and JavaScript in a browser to interact and call each other as simply as possible. DWR's main features is the reverse Ajax technology, the server can take the initiative to send a message to the client's specific Web page, rather than wait mode request then the corresponding request. This mode has a large number of Web clients for a system with high efficiency, convenient features, the most typical is the message push.
Based on the forward and reverse DWR Ajax technology is mainly used in two ways which the web chat rooms and emergency message push. By DWR technology, the server will be push the message or data to the client, rather than to constantly refresh the page to access the server through the client if there is new information and data.
Keywords Web , DWR , javascript,Chat message , Push , Server
目 次
1 绪论 1
1.1 研究背景 1
1.2 研究内容 1
1.3 论文组织结构 2
2 相关技术研究 3
2.1 “服务器推”技术 3
2.2 struts2框架技术 7
2.3 iBATIS技术 9
2.4 本章小结 9
3 DWR技术研究 10
3.1 DWR入门配置 11
3.2 简单实例研究分析 13
3.3 本章小结 16
4 应用实例 16
4.1 需求分析 17
4.1.1 web即时消息推送系统需求 17
4.1.2 功能模块 18
4.2 方案设计 21
4.2.1 概要设计 21
4.2.2 详细设计 21
4.2.3 数据库设计 22
4.3 系统实现与测试 23
4.3.1 DWR配置 23
4.3.2 DWR推送消息实现 24
4.3.3 测试结果 31