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Note the use of the fmt:formatDate tag from the previous chapter to format the date The comment portion appears below the article contents and shows the list of available comments, along with a form to add an additional one, as shown in Listing 59 Listing 59 The comment section
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<hr width="80%"> <h2>Comments</h2>
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<c:forEach items="${articlecomments}" var="comment"> Posted by <c:out value="${commentauthor}"/> at <fmt:formatDate value="${commenttime}" pattern="MM/dd/yy hh:mm"/><br> <blockquote> <c:out value="${commenttext}"/> </blockquote><p> </c:forEach>
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<hr width="80%">
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<c:if test="${user5isLoggedIn}"> <h2>Comment on this article</h2> <form action="comment_resultjsp" method="post"> <input type="hidden" name="author" value="<c:out value="${user5name}"/>"> <input type="hidden" name="articleId" value="<c:out value="${articlearticleId}"/>">
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<textarea name="text" rows="10" cols="30"> </textarea><br> <input type="submit" name="Submit" value="submit"> </form> </c:if>
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Anyone may read existing comments, so the current set is displayed with a standard c:forEach tag Java News Today has decided that only logged-in users may add comments This encourages users to sign up with the site and makes it easier to ban users who abuse the system Consequently, the input form is wrapped in a c:if tag The browser view of this page for a user who has logged in is shown in Figure 54 Note that this page recognizes a logged-in user in three ways: The login form is gone, the user's name appears in the header, and the comment section is active Figure 54 The JNT article page
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One new feature to the form itself is that the name of the user is passed in a hidden variable, a common trick for transmitting data from one page to another Although it would certainly have been possible for the receiving page to set manually the user's name in the CommentBean from the UserInfoBean, providing that information through the form allows the receiving page simply to do one jsp: setProperty instead of having to get properties from multiple places The comment result page is much like other pages that have already been considered The heart of this page will simply set the values from the form into the bean in the standard way:
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<jsp:setProperty name="comment" property="*"/>
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The CommentBean is designed so that once all the fields have been set, the comment is correctly associated with an ArticleBean Once again, putting the complex logic in the model has made it very easy to create the view
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58 The Remaining Pages
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That pretty much wraps up the set of pages available at Java News Today, at least for now Two other pages were not mentioned because they do not include anything new, but for the sake of completeness, they will be discussed briefly All pages are available on the companion CD-ROM
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The front page, indexjsp, shows a list of the ten most recent stories This looks exactly like the section page except that the list comes from edition recentArticles instead of currentSectionarticles Finally, a page is available for the user to change preferences, which was already covered in Listings 316 and 317
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59 Summary and Conclusions
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This chapter conveyed how easy it is to put together a site using beans and the standard tag library Although Java News Today is still quite simple in both design and functionality, the principles used in this example are universal and will scale well in any site Although the JNT site itself is fairly dynamic, the data behind it is not There is no way to add new stories, user preferences will be lost when the session expires, and comments will be lost if the system is ever shut down The solution to all these problems is to have the beans communicate with a database, but before seeing how this is done, it will be necessary to discuss databases in general This is the topic of the next chapter
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510 Tags Learned in this
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Passes a parameter to a page or URL Parameters: name: The name of the parameter value: The value of the parameter; may be a script Body: None
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