JSP网络编程技术pdg
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JSP(Java Server Pages)是Java平台上的一个服务器端脚本语言,用于创建动态网页和Web应用程序。它结合了HTML代码、Java代码以及内置的JavaServer Pages指令,为开发人员提供了一个灵活且功能强大的工具来构建Web应用。JSP网络编程技术主要涵盖以下几个核心知识点: 1. **JSP基本结构**:JSP页面由HTML或XML标签、脚本元素(Scriptlets、Expressions和Declarations)以及JSP指令组成。Scriptlets是Java代码片段,用于执行业务逻辑;Expressions用于输出Java表达式的值;Declarations则用于声明变量或方法。 2. **JSP生命周期**:JSP页面在首次请求时被翻译成Servlet,然后编译为.class文件,接着服务器加载并实例化该Servlet,最后处理客户端的请求。这个过程包括了加载、初始化、服务、销毁四个阶段。 3. **JSP内置对象**:JSP提供了九个内置对象,包括request、response、session、application、out、pageContext、page、config和exception。这些对象直接对应于Servlet API中的类,极大地简化了开发过程。 4. **JSP动作标签**:JSP提供了多种动作标签,如<jsp:include>用于包含其他页面,<jsp:forward>用于将请求转发到另一个页面,<jsp:useBean>用于实例化Java Bean,以及<jsp:setProperty>和<jsp:getProperty>用于操作Bean的属性。 5. **EL(Expression Language)**:EL是一种轻量级的表达式语言,用于获取和设置JSP页面上的变量,它简化了对JavaBean属性的访问。EL表达式通常出现在`${}`之中。 6. **JSTL(JavaServer Pages Standard Tag Library)**:JSTL是一套标准的JSP标签库,提供了处理常见任务的标签,比如条件语句、循环、XML处理等,旨在减少Java代码的使用,提高可读性和可维护性。 7. **Servlet与JSP的关系**:Servlet是JSP的基础,JSP最终会被翻译成Servlet代码执行。Servlet负责处理请求和响应,而JSP则更专注于视图的展示。 8. **MVC(Model-View-Controller)模式**:在JSP开发中,常常与MVC模式结合,JSP作为View,Servlet作为Controller,Model通常由JavaBean或其他业务模型组件实现,实现业务逻辑与显示的分离。 9. **Web容器**:JSP需要运行在Web容器(如Tomcat、Jetty等)中,容器负责管理Servlet和JSP的生命周期,处理HTTP请求,并提供Java EE的相关服务。 10. **Web应用部署**:通过部署描述符web.xml,可以配置JSP和Servlet的行为,包括URL映射、初始化参数、过滤器和监听器等。 在"JSP网络编程技术pdg.rar"中,"说明.htm"可能是对JSP编程技术的详细解释,"readme.txt"可能包含有关压缩包的使用指南,而"JSP网络编程技术"可能是本书的主文件,提供了深入的理论知识和实践案例,帮助读者全面掌握JSP的使用技巧。学习这些内容,开发者能够熟练地构建基于JSP的高效、可扩展的Web应用程序。
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