如何用 javaweb来写在线聊天应用.docx

如何用 javaweb来写在线聊天应用写这个玩意儿就是想练练手， 用户需要登陆才能在线聊天，不要依赖数据库， 不需要数据库的操作， 所有的数据都是保存在内存中， 如果服务器一旦重启，数据就没有了；登录界面：聊天界面：左侧是在线的用户列表， 右侧是聊天的内容， 内容的格式为 “作者 ： 内容”；点击button可以发布聊天信息；使用的是spring搭建的框架，基于tomcat的服务器；web.xml的配置如下：?xml?version=1.0?encoding=UTF-8??web-app?version=3.0??xmlns=/xml/ns/javaee??xmlns:xsi=/2001/XMLSchema-instance??xsi:schemaLocation=/xml/ns/javaee???/xml/ns/javaee/web-app_3_0.xsd??display-name/display-name??welcome-file-list??welcome-fileindex.htm/welcome-file??/welcome-file-list???servlet??servlet-nametest/servlet-name??servlet-classorg.springframework.web.servlet.DispatcherServlet/servlet-class??load-on-startup1/load-on-startup??/servlet???servlet-mapping??servlet-nametest/servlet-name??url-pattern*.htm/url-pattern??/servlet-mapping???listener??listener-classorg.springframework.web.context.ContextLoaderListener/listener-class??/listener???filter??filter-nameCharacterEncodingFilter/filter-name??filter-classcom.nono.Filter.CharacterEncodingFilter/filter-class??init-param??param-nameencoding/param-name??param-valueUTF-8/param-value??/init-param??/filter???filter??filter-nameSecurityServlet/filter-name??filter-classcom.nono.SecurityServlet/filter-class??/filter??filter-mapping??filter-nameSecurityServlet/filter-name??url-pattern*.htm/url-pattern??/filter-mapping????!--???使用Spring中的过滤器解决在请求和应答中的中文乱码问题??filter??filter-namecharacterEncodingFilter/filter-name??filter-classorg.springframework.web.filter.CharacterEncodingFilter/filter-class??init-param??param-nameencoding/param-name??param-valueutf-8/param-value??/init-param??init-param??强制转换编码(request和response均适用)???param-nameForceEncoding/param-name??param-valuetrue/param-value??/init-param??/filter??--???context-param??param-name??contextConfigLocation??/param-name??param-value??/WEB-INF/test-servlet.xml??/param-value??/context-param?/web-app?conteConfigLocation的配置为：?xml?version=1.0?encoding=UTF-8???beans?xmlns=/schema/beans??xmlns:xsi=/2001/XMLSchema-instance?xmlns:p=/schema/p??xmlns:context=/schema/context??xmlns:aop