A language used to write expressions that access the properties of JavaBeans components. EL expressions can be used in static text and in any standard or custom tag attribute that can accept an expression.
In Advanced Java, the correct answer to the question “What is JSP expression language?” is as follows:
JSP (JavaServer Pages) expression language (EL) is a scripting language used in JavaServer Pages to simplify the accessibility of objects and properties. It provides a way to embed Java-like expressions within HTML or XML code. The expressions are evaluated, converted to strings, and inserted in the place where the expression appears in the JSP page.
JSP EL helps in separating the presentation layer from the business logic by allowing developers to access data stored in JavaBeans components, request, session, and application scopes, among other objects, directly within the JSP pages.
Here’s a brief example of using JSP EL to display the value of a JavaBean property in a JSP page:
<%@ page import="com.example.UserBean" %>
<html>
<head>
<title>JSP Expression Language Example</title>
</head>
<body>
<h1>Welcome, ${userBean.userName}!</h1>
</body>
</html>
In this example, ${userBean.userName} is a JSP expression language expression that retrieves the userName property from a JavaBean named userBean. The JSP engine evaluates this expression at runtime and replaces it with the actual value of the property.