本文主要是對jsp中銀行對象的簡單介紹：
1.pageContext
2.pageScope，requestScope，sessionScope, applicationScope
3.param, paramValues
4.header, headerValues
5.cookie
6.initParam
1.pageContext :http://download.oracle.com/javaee/1.4/api/javax/servlet/jsp/PageContext.html#getRequest%28%29
2.pageScope，requestScope，sessionScope, applicationScope
這幾個對象是用來存取對應範圍之內的變數的值。
3.param和paramValues
提取rerquest對象中的值。
4.header, headerValues
去得request中header資訊。
5.cookie
6.initParam
去得web.xml中自訂的參數。例如在web.xml檔案中定義：
代碼：
<context-param><br /> <description>the author of the website</description><br /> <param-name>developer</param-name><br /> <param-value>jefferyxu</param-value><br /> </context-param>
如何使用？
<body><br /> the developer: ${ initParam.developer }<br /> </body>
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