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<html>
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<head> <title>Java News Today: Welcome!</title> </head>
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<body>
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<jsp:include page="headerjsp"/> <hr>
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<jsp:include page="navigationjsp"/> <hr>
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<%-- The contents of each page go here --%> </body>
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</html>
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Note that there are a lot of HTML elements It would be a real pain to have to rewrite them for every page on the site Fortunately, the jsp:include tag can once again come to the rescue The idea is that everything above the content can be placed in one file and everything below in another, and then each new page can be created as simply as writing
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the content and including two files This final version of the JNT home page is shown in Listing 26 Listing 26 The final version of the index page
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<%@ page errorPage="errorjsp" %>
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<jsp:include page="topjsp"/>
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Content goes here!
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<jsp:include page="bottomjsp"/>
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Now that's what a JSP should look like! For the sake of completeness, topjsp is shown in Listing 27 and bottomjsp in Listing 28 Listing 27 The top part of the page
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<%@ page errorPage="errorjsp" %>
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<html> <head> <link rel="StyleSheet" href="stylejsp" TYPE="text/css" media="screen"> <title>Java News Today: Welcome!</title> </head>
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<body>
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<table width="100%" border="0" cellspacing="0" cellpadding="0">
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<tr> <td width="15%" class="borders">
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<%-- Big Empty Corner --%> </td>
<td width="20" class="borders"> <%-- Little buffer for the curvy bit --%> <img src="1x1gif"> </td>
<td class="borders"> <%-- start header --%> <jsp:include page="headerjsp"/> <%-- end header --%> </td> </tr>
<tr> <td width="15%" class="borders"></td> <td width="20" height="20"> <%-- The curvy bit --%> <img src="corner20x20gif"> </td> <td><img src="1x1gif"></td> </tr>
<tr> <td width="15%" class="borders" valign="top"> <%-- start navigation --%> <jsp:include page="navigationjsp"/> <%-- end navigation --%> </td> <td width="20"><img src="1x1gif"></td>
<td valign="top" align="left">
Listing 28 The bottom of the page
</td> </tr>
</table> </body> </html>
Topjsp includes headerjsp and navigationjsp, but it is perfectly OK for an included JSP to include yet other ones One problem with the way this page has been split up is that the title tag is currently hard-coded in topjsp, and the page banner is likewise hard-coded in headerjsp This is quite easy to fix but requires a tag that has not been introduced yet and so will have to wait until 4 It is also worth pointing out that this page uses a style sheet to set various visual attributes of the page This in itself is not unusual; most Web sites do the same thing However, note that the style sheet being used is not a regular css file but another JSP! This will turn out to be very important when tackling customization, as it will allow the style sheet itself to be generated dynamically! For the moment, this file is static and pretty small but is shown in Listing 29 for those interested Listing 29 The style sheet
TABLEform { border-style: groove; border-color: #004400; }
TDlabel { border-style: solid; border-width: 1px; border-color: #00aa00; background: #00AA00; color: #000000; padding-right: 5px }
TDform { border-style: solid; border-width: 1px; border-color: #004400;}
TDborders { background: #66ffff; }
DIVbordered { border-style: groove; border-color: #004400; }
All versions of the index page now use the page directive to link to a custom error page, and this error page is shown in Listing 210 Listing 210 The error page
<%@ page isErrorPage="true" %>
<html>
<head> <title>Java News Today: Error</title> </head>
<body>
We're sorry, but an error occurred while building your page We will try to fix this problem shortly; in the meantime please return to the <a href="indexjsp">JNT home page</a>
</body>
</html>
Apart from the page directive at the top, this looks just like any other JSP This is only a very bare-bones example; a more realistic error page would include the same header and navigation elements that the index page used, so as to make it look more like a regular page on the site In addition, a sophisticated error page could do something like notify the site administrator that an error had occurred Unfortunately, doing something like this requires many features that have not yet been discussed, and so it will have to wait until 14
27 Summary and Conclusions
This chapter started down the exciting road of writing JSPs The two phases of a JSP's existence were discussed: the translation phase, in which JSP code is turned into a Java servlet, and the request phase, in which the servlet is run to produce HTML So far, we have not even begun to scratch the surface of what JSPs can do The next chapter starts looking at some of the things that can be done at request time, which is when the doorway to dynamic content really opens