Home Database Mysql Tutorial JSP的内部对象_MySQL

JSP的内部对象_MySQL

Jun 01, 2016 pm 02:07 PM
jsp use internal Can access object Web page ask


最后一个与JSP语法有关的组件叫做内部对象.在JSP小型指令文件内,你可以存取这些内部对象来与执行JSP网页的servlet环境相互作用。许多对内部对象的存取应该要简化。然而,这些是范例,它们的存取都是可接受的,要完整的利用内部对象设定则需要对最新的Java Servlet API有所了解。

   下表列出你可以使用的内部对象。


   内部对象说明


   request   客户端请求,此请求会包含来自GET/POST请求的参数

   response  网页传回客户端的响应

   pageContext 网页的属性是在这里管理

   session   与请求有关的会话

   application servlet正在执行的内容

   out     用来传送响应的输出流

   config   servlet的架构对象

   page    JSP网页本身

   exception  针对错误网页,未捕捉的例外

   那么,这些是做什么的,而你应该如何使用它们呢?基本上,在你的小型指令文件里,你可以使用它们来存取执行JSP程序代码的servlet。为了避免谈论到太多Servlet API 的细节,让我们来检视一些你可以利用它们来做的事: 

   不必使用表达式,你可以直接存取内部out对象来打印一些东西到response:

   . 

   不必直接传送参数到JavaBean,你可以藉由请求对象来取得参数的值:

   。

   当你以JSP写了许多的应用程序之后,如果你建立了JavaBeans或者发现你自己将太多的Java原始码放入你的JSP档案,你需要建立支持的Java类别,这样可以鼓励重复使用并且降低JSP网页转换时所需要的时间。当你需要建立Java类别时,你必须:

   将JDSWK的安装目录\bin目录加到你的PATH。在你的autoexec.bat档案的PATH行的最后,加入C:\1.2.2\bin; 。

   以下面的指令将JAR档案复制到\jre\lib\ext目录:

   copy c:\jswdk-1.0.1\lib\servlet.jar c:\jdk1.2.2\jre\lib\ext.

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