<jsp:useBean id="user" class="comawljspbookch03UserInfoBean" scope="session"/> in Java

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<jsp:useBean id="user" class="comawljspbookch03UserInfoBean" scope="session"/>
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<center><h2>Java News Today: Welcome!</h2></center>
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<div class="left"> Hello <jsp:getProperty name="user" property="name"/>! </div>
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To prepare further for customization, a link will also be added to the left navigation bar With the addition of the link and the quiz, the front page is starting to look like a real site It is shown in Figure 32 Figure 32 The new JNT home page
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It is also possible to use custom values in the style sheet: for example, to change the color behind the navigation bar and header This is illustrated in Listing 315 Listing 315 The style sheet, with a bean property
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<jsp:useBean id="user" class="comawljspbookch03UserInfoBean" scope="session"/>
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TABLEform { border-style: groove; border-color: #004400; }
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TDlabel { border-style: solid; border-width: 1px; border-color: #00aa00; background: #<jsp:getProperty name="user" property="bannerColor"/>; color: #000000; padding-right: 5px }
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TDborders { background: #<jsp:getProperty name="user" property="bannerColor"/>; }
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There is one small catch to changing the colors The little corner bit, which is used to give the site a slightly smoother look, is an image, and its color is not controlled by the style sheet It will therefore look noticeably out of place if the colors are changed This could be solved by making part of the image transparent in a clever way, but it is also possible to generate the image dynamically so that its colors match the site The advantage of the latter technique is that it makes it possible to handle an image with multiple different colors that all need to match colors on the site The disadvantage is that this requires some advanced techniques, and so it will not be possible to discuss this until 14 Difficulties with the image aside, it is already possible for the user to modify these values, thanks to the fact that the bean is in the session scope Setting new values can be done by providing a simple form that will set the name and color attributes Because the bean is in the session scope, these values, once set by such a form, will remain set until the session expires or the user changes them Listing 316 shows the customization form, and the page as seen in a browser is shown in Figure 33 Figure 33 The JNT customization page
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Listing 316 The customization form
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<jsp:include page="topjsp"/>
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<table class="form"> <form action="customize_handlerjsp" method="post"> <tr> <td class="label">Background color:</td> <td><input type="text" name="bgColor"></td> </tr>
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<tr> <td class="label">Banner color:</td> <td><input type="text" name="bannerColor"></td> </tr>
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<tr> <td class="label">Text color:</td> <td><input type="text" name="textColor"></td> </tr>
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<tr> <td class="label">Your name:</td> <td><input type="text" name="name"></td> </tr>
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<tr> <td colspan="2" align="right"> <input type="submit" name="go" value="Set Preferences"> </td> </tr> </form> </table>
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<jsp:include page="bottomjsp"/>
This is yet another standard HTML form As expected, the fun happens on the receiving page, which simply sets the bean and notifies the user that his or her preferences have been changed This is shown in Listing 317 Listing 317 The customization handler
<jsp:include page="topjsp"/>
<jsp:useBean id="user" class="comawljspbookch03UserInfoBean" scope="session"/>
<jsp:setProperty name="user" property="*"/>
Your preferences have been set!
<jsp:include page="bottomjsp"/>
These three examples should demonstrate how easy it is to use beans in order to make sites dynamic On one page, the bean is simply used to display values Another page has a very simple form that sends values to the bean in order to change these values Finally,
a third page uses a single jsp:setProperty tag to do the setting From then on, the new values will be available to the first page Finally, to tie it all together, a link to the customization page can be added to the navigation bar, as shown in Listing 318 Listing 318 Adding a link to the customization page
<jsp:include page="topjsp"/>
<jsp:useBean id="user" class="comawljspbookch03UserInfoBean" scope="session"/>
<jsp:setProperty name="user" property="*"/>
Your preferences have been set!
<jsp:include page="bottomjsp"/>
Although customization is proceeding nicely, things are not looking as good for the quiz Unfortunately, it is not yet possible to write the result page, which will state whether the user's guess was correct This will require one of those conditionals mentioned earlier and so will have to wait for the next chapter For the moment, however, it is possible to create a page that will at least tell the user what the right answer is, along with the user's guess This is shown in Listing 319 and illustrated in Figure 34 Figure 34 The placeholder quiz result page