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POBest practices of implementation of front controller using java servlets
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  1. POBest practices of implementation of front controller using java servlets
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    copied!<p>Suppose we have some project with next structure: </p> <pre> web articles main.jsp sidearts.jsp central.jsp forum main.jsp css js WEB-INF web.xml </pre> <p>Note that we don't have front controller at this point yet.</p> <p>After deploying with some facet (let it be 'asdf') we can access our pages using next URLs:</p> <pre> http://localhost:8080/asdf/articles/main.jsp http://localhost:8080/asdf/forum/main.jsp and so on.. </pre> <p>main.jsp generates some html and includes sidearts.jsp (by means of jstl c:import or any other way)</p> <p>And what will happen after adding front controller?</p> <p>Suppose we have servlet ArticlesController which is responsible for dispatching <br> some requests and which has next mapping: </p> <pre><code>&lt;servlet&gt; &lt;servlet-name&gt;ArtsController&lt;/servlet-name&gt; &lt;servlet-class&gt;org.forstackoverflow.ArticlesController&lt;/servlet-class&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;ArtsController&lt;/servlet-name&gt; &lt;url-pattern&gt;/articles/*&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; </code></pre> <p>Now when we request URL <code>http://localhost:8080/asdf/articles/main</code>, ArticlesController handles this request and try to include articles/main.jsp. And at this point infinity cycle starts because /articles/* is mapped to ArtsController.</p> <p>What is the correct solution of described problem?</p> <p>My variants are:</p> <p>1) make mappings for all jsp-files (I don't think that it is acceptible)</p> <p>2) change directories names (articles->arts); but then we get lots of new URLs (like <code>http://localhost:8080/asdf/arts/main.jsp</code>) and I think that it can be a source of bugs. </p>
 

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