What is the el in JSP?

The EL (Expression Language) in the JSP is used to access the data stored in the JavaBeans along with implicit objects like requests, sessions, etc. It uses arithmetic and logical expressions to compute the accessed data. JSP supports data types such as integers, float, string, Boolean, and null.

Syntax

${EL expression} 

Example

<jsp:setProperty name = "area" property = "parameter"  
   areaOfCircle = "${3.14*area.radius*area.radius}"/> //here . is used to access a property of the entry 

Expression Language supports most of the arithmetic and Logical operators for basic computation along with special operators like ‘.’ to access a property, ‘[]’ to access an array or list, and ‘()’ to group expression.

Functions can also be created using the JSP EL

Syntax

${ns:func(param1, param2, ...)}  //ns is the function namespace and func is the name of the function.