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10.3 JSP Scriptlets

239

As an example of executing code that is too complex for a JSP expression,

Listing 10.2 presents a JSP page that uses the 

bgColor

 request parameter to

set the background color of the page. Some results are shown in Figures

10 2, 10 3, and 10 4. 

Listing 10.2 BGColor.jsp 

<%

String bgColor = request.getParameter("bgColor");

boolean hasExplicitColor;

if (bgColor != null) {

  hasExplicitColor = true;

} else {

  hasExplicitColor = false;

  bgColor = "WHITE";

}

%>

Color Testing

<%

if (hasExplicitColor) {

  out.println("You supplied an explicit background color of " +

              bgColor + ".");

} else {

  out.println("Using default background color of WHITE. " +

              "Supply the bgColor request attribute to try " +

              "a standard color, an RRGGBB value, or to see " +

              "if your browser supports X11 color names.");

}

%>

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