« int sumOfFirstIntegers = toInteger * (toInteger + 1 ) / 2; int sumByLoop = 0 ; for (int counter = 1; counter The sum of integers from 1 to by loop is: Notice that Listing 4-4 uses pieces of Java code as opposed to an entire method. Changing Listing 4-4 to use a declaration causes the JSP translator to generate an error, as shown in Listing 4-5. Listing 4-5: Tomcat reacts to using a JSP declaration where a scriptlet is called for Error: 500 Location: /examples/jsp/loutest/loutest.jspInternal Servlet Error: org.apache.jasper.JasperException: Unable to compile class forJSPD:tomcat32worklocalhost_8080%2Fexamples_0002fjsp_0002floutest_0002floutest_0002ejsploutest_jsp_0.java:24: Typeexpected. for (int counter = 1; counter
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<%-- Here's a JSP scriptlet with pieces of code --%> <% int toInteger = Integer.parseInt(request.getParameter("to") ) ; int sumOfFirstIntegers = toInteger * (toInteger + 1 ) / 2; if (sumOfFirstIntegers > 100000){ %> Big Number <% } else { %> Small Number <% } %> As you can see, the if statement is broken into pieces with some pieces as HTML and some as Java code. The requirement for a syntactically correct scriptlet is that all the pieces must form syntactically correct Java code. The following statement uses an implicit object called request: int toInteger = Integer.parseInt(request.getParameter(”to”) ); You pass the parameter by entering the name of the JSP with the parameter entry as shown here: http://localhost:8080/examples/jsp/loutest/loutest.jsp?to=50 You can code JSP scriptlets as XML tags, as follows: Java Code You see that JSP allows you, the JSP programmer, to use Java code in your JSP pages in interesting and flexible ways. However, you have additional capabilities that do not involve embedding Java code in your JSP page. JSP supports a variety of standard actions, which are covered in the next section.
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This entry was posted on Tuesday, January 15th, 2008 at 4:21 am and is filed under JSP and Java On The Edge. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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