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<h1>CDI @SessionScoped</h1>
</div>
</div>
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<div class="row">
<div class="col-md-12">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph">
<p>Este exemplo mostra o uso da anotação <code>@SessionScoped</code> para objetos injetados. Um objeto que é definido
como <code>@SessionScoped</code> é criado para cada HTTPSession e é compartilhado por todos os beans que o injetam
através do mesmo HTTPSession.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_execute_a_aplicação">Execute a aplicação:</h2>
<div class="sectionbody">
<div class="literalblock">
<div class="content">
<pre>mvn clean install tomee:run</pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_exemplo">Exemplo</h2>
<div class="sectionbody">
<div class="paragraph">
<p>Este exemplo tem um endpoint em que um usuário fornece um <code>name</code> no parâmetro da requisição, que é
persistido como um field em um session scoped bean chamado <code>SessionBean</code> e então é recuperado por outro
endpoint.</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_requisição">Requisição</h2>
<div class="sectionbody">
<div class="paragraph">
<p>GET <a href="http://localhost:8080/cdi-session-scope/set-name?name=Puneeth" class="bare">http://localhost:8080/cdi-session-scope/set-name?name=Puneeth</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_resposta">Resposta</h2>
<div class="sectionbody">
<div class="paragraph">
<p><code>done, go to /name servlet</code></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_requisição_2">Requisição</h2>
<div class="sectionbody">
<div class="paragraph">
<p>GET <a href="http://localhost:8080/cdi-session-scope/name" class="bare">http://localhost:8080/cdi-session-scope/name</a></p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_resposta_2">Resposta</h2>
<div class="sectionbody">
<div class="paragraph">
<p>name = {Puneeth}</p>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_sessionbean">SessionBean</h2>
<div class="sectionbody">
<div class="paragraph">
<p>A anotação <code>@SessionScoped</code> especifica que este bean tem escopo de sessão, então haverá apenas uma
instância dessa classe associada a uma HTTPSession particular.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@SessionScoped
public class SessionBean implements Serializable {
private String name;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_inputservlet">InputServlet</h2>
<div class="sectionbody">
<div class="paragraph">
<p><code>InputServlet</code> é um servlet genérico que é mapeado pela url <code>/set-name</code>. O bean de escopo de sessão
<code>SessionBean</code> foi injetado neste servlet, e o parâmetro de entrada da requisição sera atribuído ao field
<code>name</code> do bean.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@WebServlet(name = "input-servlet", urlPatterns = {"/set-name"})
public class InputServlet extends HttpServlet {
@Inject
private SessionBean bean;
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp
throws ServletException, IOException {
final String name = req.getParameter("name");
if (name == null || name.isEmpty()) {
resp.getWriter().write("please add a parameter name=xxx");
} else {
bean.setName(name);
resp.getWriter().write("done, go to /name servlet");
}
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_answerbean">AnswerBean</h2>
<div class="sectionbody">
<div class="paragraph">
<p>O bean <code>AnswerBean</code> tem escopo de requisição com um <code>SessionBean</code> injetado. Ele contem um método
<code>@PostConstruct</code> em que o valor do campo <code>name</code> do <code>SessionBean</code> é recuperado e atribuído ao campo <code>value</code>.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">public class AnswerBean {
@Inject
private SessionBean bean;
private String value;
@PostConstruct
public void init() {
value = '{' + bean.getName() + '}';
}
public String value() {
return value;
}
}</code></pre>
</div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_outputservlet">OutputServlet</h2>
<div class="sectionbody">
<div class="paragraph">
<p><code>OutputServlet</code> é outro servlet com o <code>AnswerBean</code> injetado. Quando <code>/name</code> é chamado o valor do <code>AnswerBean</code>
é lido e escrito na resposta.</p>
</div>
<div class="listingblock">
<div class="content">
<pre class="highlight"><code class="language-java" data-lang="java">@WebServlet(name = "output-servlet", urlPatterns = {"/name"})
public class OutputServlet extends HttpServlet {
@Inject
private AnswerBean bean;
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
final String name = bean.value();
if (name == null || name.isEmpty()) {
resp.getWriter().write("please go to servlet /set-name please");
} else {
resp.getWriter().write("name = " + name);
}
}
}</code></pre>
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