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JSP application is computer program designed for specific task and solution. This application can contain JSP, Servlet, xml, class files, and jar files. Suppose a shopping store has a software to sale, buy, purchase, shipping products, payments, upload new products, all these belongs to single store. This single unit is called application. All files (JSP) work together to perform specific task.
The application object is used to store and retrieve from any page of JSP or any where in application scope. This is something like session object, but session object is made for per user. And no other user can access session object of other user. Application object is available to all, can be access by all users, because it is single object.
Store and Retrieve Application Variables
JSP use in application objects ServletContext object. This object also contain values of session object and available to all. Another one is application object. We will see in example of this application object in JSP
applicationObject.jsp
<%@ page language="java" import="java.sql.*" %>
<%
String parameterValue="This is application object";
getServletContext().setAttribute("ApplicationValue","This is my Name");
String getValueApplcation=(String)getServletContext().getAttribute("ApplicationValue");
application.setAttribute("ApplcationVariable",parameterValue);
String getApplicationVariable=(String)application.getAttribute("ApplcationVariable");
%>
<html>
<head>
<title>Applcation object in JSP</title>
</head>
<body>
The value of getting getServletContext application object <%=getValueApplcation%><br>
This is application object :<%=getApplicationVariable%>
</body>
</html>
Application object handling is same as session object handling. This is done by servlet container
| Method |
Return |
Description |
| equals(Object obj) |
Objects |
Matching objects |
| getAttribute(String str) |
Objects |
Getting value through application objects |
| getAttributeNames() |
Enumeration |
an Enumeration of attribute names |
| getContext(String str) |
ServletContext |
|
| getContextPath() |
String |
|
| getInitParameter(String str) |
String |
|
| getInitParameterNames() |
Enumeration |
|
| getMajorVersion() |
int |
|
| getMimeType(String str) |
String |
|
| getMinorVersion() |
int |
|
| getNamedDispatcher(String str) |
RequestDispatcher |
|
| getRealPath(String str) |
String |
|
| getRequestDispatcher(String str) |
RequestDispatcher |
|
| getResource(String str) |
URL |
|
| getResourceAsStream(String str) |
InputStream |
|
| getResourcePaths(String str) |
Set |
|
| log(String str) |
void |
|
| log(String str, Throwable t) |
void |
|
| removeAttribute(String str) |
void |
|
| setAttribute(String str, Object obj) |
void |
|
| toString() |
String |
|
|
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