JSP Scriptlets Example
In this section, we will understand Scriptlets with the help of an Example.
In this section, we will understand Scriptlets with the help of an Example.JSP Scriptlets Example
In this section, we will understand Scriptlets with the help of an Example. JSP allows you embed java code inside JSP page. The java code is written inside <% and %> , This block is known as Scriplets. Scriplets is executed every time a JSP page is invoked.The syntax to declare JSP Scriplets to include valid Java code is:
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<% Java code %> |
Scriptlets can't generate HTML itself . Using "out" variable , it can generate HTML. This variable does not need to be declared. It is already predefined for Scriptlets, along with some other variables. The "out" variable is of type "javax.servlet.jsp.JspWriter".
Scriptlets Example
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<HTML> <BODY> <% // This scriptlet declares and initializes "date" System.out.println( "Evaluating date now" ); java.util.Date date = new java.util.Date(); %> Hello! The time is now <% // This scriptlet generates HTML output out.println( String.valueOf( date )); %> </BODY> </HTML>
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Output
Predefined Scriptlet variable "request"
The JSP "request" variable is used to obtain information from the request as sent by the browser. For instance, you can find out the name of the client's host (if available, otherwise the IP address will be returned.) Let us modify the code as shown :
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<HTML> <BODY> <% // This scriptlet declares and initializes "date" System.out.println( "Evaluating date now" ); java.util.Date date = new java.util.Date(); %> Hello! The time is now <% out.println( date ); out.println( "<BR>Your machine's address is " ); out.println( request.getRemoteHost()); %> </BODY> </HTML>
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OUTPUT
A similar variable is "response". This can be used to affect the response being sent to the browser. For instance, you can call response.sendRedirect( anotherUrl ) to send a response to the browser that it should load a different URL
