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What is a Expression?
Expression in JSP is used to write the output on the stream. It has the following form :

<%= Java Expression %>

The Java expression is evaluated, converted to a string, and inserted in the page. This evaluation is performed at run-time and thus has full access to information about the request. For example, the following shows the date/time that the page was requested:

Current time is : <%= new java.util.Date() %>
Posted By: Name:Rajesh Kr URL: What is a Expression?