推荐回答(2个)
JSP页面是一种包含了静态数据和JSP元素两种类型的文本的文本文档。静态数据可以用任何基于文本的格式来表示,比如:HTML或者XML。JSP是一种混合了静态内容和动态产生的内容的技术。
JSP 页面的扩展名为 .jsp 或.jspx,web 服务器通过此扩展名通知 JSP 引擎处理该页面中的元素。通过部署描述文件 web.xml,也可使用其他扩展名和 JSP 引擎联系。
JSP 规范里描述了 JSP 页面的确切格式。
通过JSP 引擎解释 JSP 页面中的标签,生成所需内容。例如,调用一个 bean 来访问一个使用JDBC API 的数据库或者是包含一个文件。然后 JSP 引擎把返回的结果以 HTML(或XML)页面的形式发送到浏览器。实质上是把生成内容的业务逻辑封装在服务器端处理的标签和 beans 中。
JSP 页面通常被编译成 Java 平台 servlet 类。因此,JSP 页面的运行需要有能支持 Java 平台 servlet 规范的 Java 虚拟机。
JSP 页面实际上只是在第一次被调用的时候被编译一次。页面被编译成 Java Servlet 类 ,并驻留在服务器内存中,这样以后调用该页面时将很快。
有关JSP 的 语法和参考 可以到我们的网站上浏览和下载。
当然,JSP 规范支持 XML 文档的创建。对于简单的 XML 文档生成,XML 标签将以静态的部分包含在 JSP 页面中。动态的 XML 生成则需要使用 bean 组件或者自定义标签来实现。参阅白皮书 Developing XML Solutions with JavaServer Pages Technology (PDF)可以获得更多的细节。
JSP 2.0 规范描述了 JSP 页面和 XML 文档之间的映射。通过该映射可以使用 XML 工具来生成和处理 JSP 页面。
JSP 规范包括了标准的标签,用于使用和处理 bean。使用 useBean 标签生成一个特定 JavaBeans 的实例。如果这个类的实例已经存在,则直接使用。否则,创建一个新的实例。setProperty 和 getProperty 标签允许您操作给定对象的属性。
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