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| <h1>Guestbook</h1> |
| </header> |
| <section class="l-one-third right"> |
| <div id="toc" class="toc"><div id="toc-title"><h2>Table of Contents</h2></div><ul><li class="toc--level-1 toc--section-1"><a href="#commentjava"><span class="toc-number">1</span> <span class="toc-text">Comment.java</span></a></li><li class="toc--level-1 toc--section-2"><a href="#guestbookjava"><span class="toc-number">2</span> <span class="toc-text">GuestBook.java</span></a></li><li class="toc--level-1 toc--section-3"><a href="#guestbookhtml"><span class="toc-number">3</span> <span class="toc-text">GuestBook.html</span></a></li><li class="toc--level-1 toc--section-4"><a href="#guestbookapplicationjava"><span class="toc-number">4</span> <span class="toc-text">GuestBookApplication.java</span></a></li><li class="toc--level-1 toc--section-5"><a href="#webxml"><span class="toc-number">5</span> <span class="toc-text">web.xml</span></a></li></ul></div> |
| </section> |
| <section class="l-two-third left"> |
| <p>The GuestBook application allows users to enter comments that appear on a |
| page like a weblog. Drawing the list of comments is very easy with the Wicket |
| <code class="language-plaintext highlighter-rouge">ListView</code> component. This example also gives an impression of what form |
| handling is like.</p> |
| <p><img src="guestbook.png" alt="Guestbook screenshot" /></p> |
| <p>As with all examples, you have to put all files in the same package |
| directory. This means putting the markup files and the java files next to one |
| another. It is possible to alter this behavior, but that is beyond the scope |
| of this example.</p> |
| <h2 id="commentjava">Comment.java</h2> |
| <p>The Comment POJO model is very straightforward:</p> |
| <figure class="highlight"><pre><code class="language-java" data-lang="java"><span class="kn">package</span> <span class="nn">org.apache.wicket.examples.guestbook</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.Date</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.IClusterable</span><span class="o">;</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">Comment</span> <span class="kd">implements</span> <span class="nc">IClusterable</span> <span class="o">{</span> |
| <span class="kd">private</span> <span class="nc">String</span> <span class="n">text</span><span class="o">;</span> |
| <span class="kd">private</span> <span class="nc">Date</span> <span class="n">date</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">Date</span><span class="o">();</span> |
| <span class="kd">public</span> <span class="nf">Comment</span><span class="o">()</span> <span class="o">{</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="nf">Comment</span><span class="o">(</span><span class="kd">final</span> <span class="nc">Comment</span> <span class="n">comment</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">this</span><span class="o">.</span><span class="na">text</span> <span class="o">=</span> <span class="n">comment</span><span class="o">.</span><span class="na">text</span><span class="o">;</span> |
| <span class="k">this</span><span class="o">.</span><span class="na">date</span> <span class="o">=</span> <span class="n">comment</span><span class="o">.</span><span class="na">date</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="nc">String</span> <span class="nf">getText</span><span class="o">()</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="n">text</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="kt">void</span> <span class="nf">setText</span><span class="o">(</span><span class="nc">String</span> <span class="n">text</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">this</span><span class="o">.</span><span class="na">text</span> <span class="o">=</span> <span class="n">text</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="nc">Date</span> <span class="nf">getDate</span><span class="o">()</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="n">date</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="kt">void</span> <span class="nf">setDate</span><span class="o">(</span><span class="nc">Date</span> <span class="n">date</span><span class="o">)</span> <span class="o">{</span> |
| <span class="k">this</span><span class="o">.</span><span class="na">date</span> <span class="o">=</span> <span class="n">date</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="kd">public</span> <span class="nc">String</span> <span class="nf">toString</span><span class="o">()</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="s">"[Comment date = "</span> <span class="o">+</span> <span class="n">date</span> <span class="o">+</span> <span class="s">", text = "</span> <span class="o">+</span> <span class="n">text</span> <span class="o">+</span> <span class="s">"]"</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre></figure> |
| <h2 id="guestbookjava">GuestBook.java</h2> |
| <p>In the file <code class="language-plaintext highlighter-rouge">GuestBook.java</code> we have put the Java component code for the |
| guestbook page. This is the homepage for the guestbook application. The page |
| consists of a form for entering new items to the guestbook and a list of |
| repeating markup for showing the guestbook entries.</p> |
| <p>The <code class="language-plaintext highlighter-rouge">GuestBook</code> constructor adds a <code class="language-plaintext highlighter-rouge">CommentForm</code> and a <code class="language-plaintext highlighter-rouge">ListView</code> of |
| the comments. Notice how the model is passed in as the second argument to the |
| <code class="language-plaintext highlighter-rouge">ListView</code> constructor.</p> |
| <p>Then as the view renders, the <code class="language-plaintext highlighter-rouge">populateItem</code> method is called passing in a |
| <code class="language-plaintext highlighter-rouge">ListItem</code> container for the current row in the list.</p> |
| <p>The implementation below obtains the <code class="language-plaintext highlighter-rouge">Comment</code> POJO from the list item and |
| adds label components for the date and text of the <code class="language-plaintext highlighter-rouge">Comment</code>. This is all |
| accomplished in just a few lines of code.</p> |
| <figure class="highlight"><pre><code class="language-java" data-lang="java"><span class="kn">package</span> <span class="nn">org.apache.wicket.examples.guestbook</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.ArrayList</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.Collections</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.Date</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">java.util.List</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.commons.lang.StringUtils</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.examples.WicketExamplePage</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.basic.Label</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.basic.MultiLineLabel</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.form.Form</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.form.TextArea</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.form.TextField</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.list.ListItem</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.markup.html.list.PropertyListView</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.model.CompoundPropertyModel</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.util.value.ValueMap</span><span class="o">;</span> |
| <span class="kd">public</span> <span class="kd">final</span> <span class="kd">class</span> <span class="nc">GuestBook</span> <span class="kd">extends</span> <span class="nc">WicketExamplePage</span> <span class="o">{</span> |
| <span class="cm">/** A global list of all comments from all users across all sessions */</span> |
| <span class="kd">private</span> <span class="kd">static</span> <span class="kd">final</span> <span class="nc">List</span><span class="o"><</span><span class="nc">Comment</span><span class="o">></span> <span class="n">commentList</span> <span class="o">=</span> <span class="nc">Collections</span><span class="o">.</span><span class="na">synchronizedList</span><span class="o">(</span><span class="k">new</span> <span class="nc">ArrayList</span><span class="o"><</span><span class="nc">Comment</span><span class="o">>());</span> |
| <span class="cm">/** |
| * Constructor that is invoked when page is invoked without a session. |
| */</span> |
| <span class="kd">public</span> <span class="nf">GuestBook</span><span class="o">()</span> <span class="o">{</span> |
| <span class="c1">// Add comment form</span> |
| <span class="n">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">CommentForm</span><span class="o">(</span><span class="s">"commentForm"</span><span class="o">));</span> |
| <span class="c1">// Add commentListView of existing comments</span> |
| <span class="n">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">PropertyListView</span><span class="o"><</span><span class="nc">Comment</span><span class="o">>(</span><span class="s">"comments"</span><span class="o">,</span> <span class="n">commentList</span><span class="o">)</span> <span class="o">{</span> |
| <span class="nd">@Override</span> |
| <span class="kd">public</span> <span class="kt">void</span> <span class="nf">populateItem</span><span class="o">(</span><span class="kd">final</span> <span class="nc">ListItem</span><span class="o"><</span><span class="nc">Comment</span><span class="o">></span> <span class="n">listItem</span><span class="o">)</span> <span class="o">{</span> |
| <span class="n">listItem</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">Label</span><span class="o">(</span><span class="s">"date"</span><span class="o">));</span> |
| <span class="n">listItem</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">MultiLineLabel</span><span class="o">(</span><span class="s">"text"</span><span class="o">));</span> |
| <span class="o">}</span> |
| <span class="o">}).</span><span class="na">setVersioned</span><span class="o">(</span><span class="kc">false</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="cm">/** |
| * A form that allows a user to add a comment. |
| */</span> |
| <span class="kd">public</span> <span class="kd">final</span> <span class="kd">class</span> <span class="nc">CommentForm</span> <span class="kd">extends</span> <span class="nc">Form</span><span class="o"><</span><span class="nc">ValueMap</span><span class="o">></span> <span class="o">{</span> |
| <span class="kd">public</span> <span class="nf">CommentForm</span><span class="o">(</span><span class="kd">final</span> <span class="nc">String</span> <span class="n">id</span><span class="o">)</span> <span class="o">{</span> |
| <span class="c1">// Construct form with no validation listener</span> |
| <span class="kd">super</span><span class="o">(</span><span class="n">id</span><span class="o">,</span> <span class="k">new</span> <span class="nc">CompoundPropertyModel</span><span class="o"><</span><span class="nc">ValueMap</span><span class="o">>(</span><span class="k">new</span> <span class="nc">ValueMap</span><span class="o">()));</span> |
| <span class="c1">// this is just to make the unit test happy</span> |
| <span class="n">setMarkupId</span><span class="o">(</span><span class="s">"commentForm"</span><span class="o">);</span> |
| <span class="c1">// Add text entry widget</span> |
| <span class="n">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">TextArea</span><span class="o"><</span><span class="nc">String</span><span class="o">>(</span><span class="s">"text"</span><span class="o">).</span><span class="na">setType</span><span class="o">(</span><span class="nc">String</span><span class="o">.</span><span class="na">class</span><span class="o">));</span> |
| <span class="c1">// Add simple automated spam prevention measure.</span> |
| <span class="n">add</span><span class="o">(</span><span class="k">new</span> <span class="nc">TextField</span><span class="o"><</span><span class="nc">String</span><span class="o">>(</span><span class="s">"comment"</span><span class="o">).</span><span class="na">setType</span><span class="o">(</span><span class="nc">String</span><span class="o">.</span><span class="na">class</span><span class="o">));</span> |
| <span class="o">}</span> |
| <span class="cm">/** |
| * Show the resulting valid edit |
| */</span> |
| <span class="nd">@Override</span> |
| <span class="kd">public</span> <span class="kd">final</span> <span class="kt">void</span> <span class="nf">onSubmit</span><span class="o">()</span> <span class="o">{</span> |
| <span class="nc">ValueMap</span> <span class="n">values</span> <span class="o">=</span> <span class="n">getModelObject</span><span class="o">();</span> |
| <span class="c1">// check if the honey pot is filled</span> |
| <span class="k">if</span> <span class="o">(</span><span class="nc">StringUtils</span><span class="o">.</span><span class="na">isNotBlank</span><span class="o">((</span><span class="nc">String</span><span class="o">)</span><span class="n">values</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="s">"comment"</span><span class="o">)))</span> <span class="o">{</span> |
| <span class="n">error</span><span class="o">(</span><span class="s">"Caught a spammer!!!"</span><span class="o">);</span> |
| <span class="k">return</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="c1">// Construct a copy of the edited comment</span> |
| <span class="nc">Comment</span> <span class="n">comment</span> <span class="o">=</span> <span class="k">new</span> <span class="nc">Comment</span><span class="o">();</span> |
| <span class="c1">// Set date of comment to add</span> |
| <span class="n">comment</span><span class="o">.</span><span class="na">setDate</span><span class="o">(</span><span class="k">new</span> <span class="nc">Date</span><span class="o">());</span> |
| <span class="n">comment</span><span class="o">.</span><span class="na">setText</span><span class="o">((</span><span class="nc">String</span><span class="o">)</span><span class="n">values</span><span class="o">.</span><span class="na">get</span><span class="o">(</span><span class="s">"text"</span><span class="o">));</span> |
| <span class="n">commentList</span><span class="o">.</span><span class="na">add</span><span class="o">(</span><span class="mi">0</span><span class="o">,</span> <span class="n">comment</span><span class="o">);</span> |
| <span class="c1">// Clear out the text component</span> |
| <span class="n">values</span><span class="o">.</span><span class="na">put</span><span class="o">(</span><span class="s">"text"</span><span class="o">,</span> <span class="s">""</span><span class="o">);</span> |
| <span class="o">}</span> |
| <span class="o">}</span> |
| <span class="cm">/** |
| * Clears the comments. |
| */</span> |
| <span class="kd">public</span> <span class="kd">static</span> <span class="kt">void</span> <span class="nf">clear</span><span class="o">()</span> <span class="o">{</span> |
| <span class="n">commentList</span><span class="o">.</span><span class="na">clear</span><span class="o">();</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre></figure> |
| <p>When the <code class="language-plaintext highlighter-rouge">CommentForm</code> is submitted, the <code class="language-plaintext highlighter-rouge">onSubmit()</code> method is called. |
| Notice that nothing gets the value of the <code class="language-plaintext highlighter-rouge">TextArea</code> that was added in the |
| <code class="language-plaintext highlighter-rouge">CommentForm</code> constructor. This is because the comment is the model and the |
| third parameter to the <code class="language-plaintext highlighter-rouge">TextArea</code> constructor specified the property of the |
| model to update. So all <code class="language-plaintext highlighter-rouge">onSubmit()</code> has to do is create a new comment from |
| the model that was updated and add it to the comment list. When the page |
| redraws, the new list will be rendered.</p> |
| <p>We use a synchronized list as our shared static model used by <code class="language-plaintext highlighter-rouge">commentListView</code> |
| (<code class="language-plaintext highlighter-rouge">commentList</code>) to ensure that it is only updated by one thread at a time. |
| Remember, this is a multi-user application with a shared model!</p> |
| <p>Finally, you may notice the call to <code class="language-plaintext highlighter-rouge">commentListView.modelChanged()</code>. This |
| informs the list view that its model has been modified. In more advanced |
| usage scenarios, this would allow Wicket to expire stale pages accessed with |
| the browser’s back button.</p> |
| <h2 id="guestbookhtml">GuestBook.html</h2> |
| <p>In the HTML below, notice the way that the <code class="language-plaintext highlighter-rouge">TextArea</code> component is being |
| nested inside the <code class="language-plaintext highlighter-rouge">CommentForm</code>. Wicket is able to keep everything straight |
| because the Java <code class="language-plaintext highlighter-rouge">Component.add()</code> calls have to result in the same nesting |
| structure as the HTML.</p> |
| <p>Finally, notice the <code class="language-plaintext highlighter-rouge"><wicket:remove></code> block. This is simply markup that is |
| there for previewing purposes only. When the page renders, it is stripped |
| out.</p> |
| <figure class="highlight"><pre><code class="language-html" data-lang="html"><span class="nt"><html</span> <span class="na">xmlns:wicket=</span><span class="s">"http://wicket.apache.org/"</span><span class="nt">></span> |
| <span class="nt"><head></span> |
| <span class="nt"><title></span>Wicket Examples - guestbook<span class="nt"></title></span> |
| <span class="nt"><link</span> <span class="na">rel=</span><span class="s">"stylesheet"</span> <span class="na">type=</span><span class="s">"text/css"</span> <span class="na">href=</span><span class="s">"style.css"</span><span class="nt">/></span> |
| <span class="nt"></head></span> |
| <span class="nt"><body></span> |
| <span class="nt"><span</span> <span class="na">wicket:id=</span><span class="s">"mainNavigation"</span><span class="nt">/></span> |
| <span class="nt"><form</span> <span class="na">wicket:id=</span><span class="s">"commentForm"</span><span class="nt">></span> |
| Add your comment here: |
| <span class="nt"><p></span> |
| <span class="nt"><textarea</span> <span class="na">wicket:id=</span><span class="s">"text"</span><span class="nt">></span>This is a comment<span class="nt"></textarea></span> |
| <span class="nt"><input</span> <span class="na">type=</span><span class="s">"text"</span> <span class="na">wicket:id=</span><span class="s">"comment"</span> <span class="na">class=</span><span class="s">"nospam"</span> <span class="na">onfocus=</span><span class="s">"getElementById('formsubmit').focus();"</span><span class="nt">/></span> |
| <span class="nt"><p></span> |
| <span class="nt"><input</span> <span class="na">type=</span><span class="s">"submit"</span> <span class="na">value=</span><span class="s">"Submit"</span> <span class="na">id=</span><span class="s">"formsubmit"</span><span class="nt">/></span> |
| <span class="nt"></form></span> |
| <span class="nt"><p/></span> |
| <span class="nt"><span</span> <span class="na">wicket:id=</span><span class="s">"comments"</span><span class="nt">></span> |
| <span class="nt"><p></span> |
| <span class="nt"><span</span> <span class="na">wicket:id=</span><span class="s">"date"</span><span class="nt">></span>1/1/2004<span class="nt"></span><br></span> |
| <span class="nt"><span</span> <span class="na">wicket:id=</span><span class="s">"text"</span><span class="nt">></span>Comment text goes here.<span class="nt"></span></span> |
| <span class="nt"></p></span> |
| <span class="nt"></span></span> |
| <span class="nt"><wicket:remove></span> |
| <span class="nt"><p></span> |
| 1/2/2004<span class="nt"><br/></span> |
| More comment text here. |
| <span class="nt"></p></span> |
| <span class="nt"></wicket:remove></span> |
| <span class="nt"></body></span> |
| <span class="nt"></html></span></code></pre></figure> |
| <h2 id="guestbookapplicationjava">GuestBookApplication.java</h2> |
| <p>For completeness, we’ve included the <code class="language-plaintext highlighter-rouge">GuestBookApplication</code> class, and as a |
| final treat the modifications to the <code class="language-plaintext highlighter-rouge">web.xml</code> file.</p> |
| <figure class="highlight"><pre><code class="language-java" data-lang="java"><span class="kn">package</span> <span class="nn">org.apache.wicket.examples.guestbook</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.Page</span><span class="o">;</span> |
| <span class="kn">import</span> <span class="nn">org.apache.wicket.examples.WicketExampleApplication</span><span class="o">;</span> |
| <span class="kd">public</span> <span class="kd">class</span> <span class="nc">GuestBookApplication</span> <span class="kd">extends</span> <span class="nc">WicketExampleApplication</span> <span class="o">{</span> |
| <span class="kd">public</span> <span class="nf">GuestBookApplication</span><span class="o">()</span> <span class="o">{</span> |
| <span class="o">}</span> |
| <span class="nd">@Override</span> |
| <span class="kd">public</span> <span class="nc">Class</span><span class="o"><</span> <span class="o">?</span> <span class="kd">extends</span> <span class="nc">Page</span><span class="o">></span> <span class="nf">getHomePage</span><span class="o">()</span> <span class="o">{</span> |
| <span class="k">return</span> <span class="nc">GuestBook</span><span class="o">.</span><span class="na">class</span><span class="o">;</span> |
| <span class="o">}</span> |
| <span class="o">}</span></code></pre></figure> |
| <h2 id="webxml">web.xml</h2> |
| <p>Add the following two sections (servlet and servlet-mapping) to your web.xml |
| file for running this application.</p> |
| <figure class="highlight"><pre><code class="language-xml" data-lang="xml"><span class="nt"><filter></span> |
| <span class="nt"><filter-name></span>GuestBookApplication<span class="nt"></filter-name></span> |
| <span class="nt"><filter-class></span>org.apache.wicket.protocol.http.WicketFilter<span class="nt"></filter-class></span> |
| <span class="nt"><init-param></span> |
| <span class="nt"><param-name></span>applicationClassName<span class="nt"></param-name></span> |
| <span class="nt"><param-value></span>org.apache.wicket.examples.guestbook.GuestBookApplication<span class="nt"></param-value></span> |
| <span class="nt"></init-param></span> |
| <span class="nt"></filter></span></code></pre></figure> |
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