Conditional content in JSP page (original) (raw)

With this example we are going to see how to create a conditional content in a JSP page. JavaServer Pages (JSP) is a server-side programming technology that enables the creation of dynamic, platform-independent method for building Web-based applications. JSP have access to the entire family of Java APIs, including the JDBC API to access enterprise databases. In short, to create an if-then-else statement in a jsp page one should follow these steps:

Create a jsp page that begins with the <%code fragment%> scriptlet. It can contain any number of JAVA language statements, variable or method declarations, or expressions that are valid in the page scripting language.
Keep any html tags in the page outside the scriptlet.
Create the java if-then-else statement inside the scriptlet, but close the scriptlet at each line. HTML text can be included between scriptlet tags.

An example of a conditional content in a jsp page is below:

ConditionalContent.jsp

<%@ page language="java" contentType="text/html;charset=UTF-8" %>

Java Code Geeks Snippets - Condition Content in JSP Page

<%
    if ("myvalue".equals(request.getParameter("myparam"))) {
%>
    This will be printed if parameter myparam equals with myvalue
<%
    } 
    else {
%>
    This will be printed if parameter myparam DOES NOT equal with myvalue
<%
    }
%>

URL:

http://localhost:8080/jcgsnippets/ConditionalContent.jsp?myparam=myvalue

Output:

This will printed if parameter myparam equals with myvalue

This was an example on how to create a conditional content in a JSP page.

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.