Mixing Static Data with Scriptlets for Compound Statements

JSP Tutorials - Herong's Tutorial Examples

∟Mixing Static Data with Scriptlets for Compound Statements

This section provides a tutorial example on how to mix static data with scriptlets to form Java compound statements like 'if', or 'while'.

One thing interested the most in writing JSP scriptlets is how you can mix static data and scriptlets together to form compound Java statements like "if" or "while" statements. Here is a simple example:

<html><body>
<!-- Mixed_Scripting.jsp
   Copyright (c) 2002 HerongYang.com. All Rights Reserved.
-->
<pre>
Mixed "if" statement:
<% java.util.Calendar now = java.util.Calendar.getInstance();
   if (now.get(java.util.Calendar.AM_PM) == java.util.Calendar.AM) {
%>
Good Morning
<% } else { %>
Good Afternoon
<% } %>
</pre>
</body></html>

My guess is that the converted Java class should have the following code fragment:

   java.util.Calendar now = java.util.Calendar.getInstance();
   if (now.get(java.util.Calendar.AM_PM) == java.util.Calendar.AM) {
      out.write("Good Morning");
   } else {
      out.write("Good Afternoon");
   }

If you deploy the JSP page, Mixed_Scripting.jsp, to Tomcat, and visit it with a browser, Tomcat will convert it to: Mixed_005fScripting_jsp.java:

...
out.write("<html><body>\r\n");
out.write("<!-- Mixed_Scripting.jsp\r\n");
out.write(
   "   Copyright (c) 2002 HerongYang.com. All Rights Reserved.\r\n");
out.write("-->\r\n");
out.write("<pre>\r\n");
out.write("Mixed \"if\" statement:\r\n");
 java.util.Calendar now = java.util.Calendar.getInstance();
   if (now.get(java.util.Calendar.AM_PM) == java.util.Calendar.AM) {

out.write("\r\n");
out.write("Good Morning\r\n");
 } else {
out.write("\r\n");
out.write("Good Afternoon\r\n");
 }
out.write("\r\n");
out.write("</pre>\r\n");
out.write("</body></html>\r\n");
...