JSP EL Implicit Objects
Apart from operators, JSP also provide expression language implicit objects. The role of these implicit objects is to get the attribute associated with various object. Here, is the list of expression language implicit objects with their purposes.
|
Implicit Object |
Description |
|
requestScope |
Fetches the attribute associated with request object. |
|
sessionScope |
Fetches the attribute associated with session object. |
|
pageScope |
It provides the attribute associate within pageScope. |
|
applicationScope |
Fetches the attribute associated with application object. |
|
param |
It retrieves the single value associated with request parameter. |
|
paramValues |
It retrieves the array of values associated with request parameter. |
|
header |
It retrieves the single value associated with header parameter. |
|
headerValues |
It retrieves the array of values associated with header parameter. |
|
cookie |
It is used to get the value of cookies. |
|
initParam |
It is used to map an initialize parameter. |
|
pageContext |
The role of this object is similar to JSP pageContext implicit object. |
Example of Expression Language Implicit Object
This example shows the way of using various expression language implicit objects.
index.jsp
<% request.setAttribute("Tutorial", "Java"); application.setAttribute("Tutorial", "Python"); request.getSession().setAttribute("Tutorial", "PHP"); %> Host name: ${header["host"]}
Path name: ${pageContext.request.contextPath}
Tutorials:
${requestScope.Tutorial}
${applicationScope.Tutorial}
${sessionScope.Tutorial}
Output:
