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What is JSP Expression?

JSP Expression:

A JSP expression element contains a scripting language expression that is evaluated, converted to a String, and inserted where the expression appears in the JSP file.

Because the value of an expression is converted to a String, you can use an expression within a line of text, whether or not it is tagged with HTML, in a JSP file.

The expression element can contain any expression that is valid according to the Java Language Specification but you cannot use a semicolon to end an expression.

Following is the syntax of JSP Expression:

 <%= expression %>

You can write XML equivalent of the above syntax as follows:

Following is the simple example for JSP Expression:

<head><title>A Comment Test</title></head>
Today's date: <%= (new java.util.Date()).toLocaleString()%>

This would generate following result:
Today's date: 11-Sep-2010 21:24:25