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<document>  <header>    <product>resin</product>    <title>Dependency-injection servlet configuration</title>    <type>tutorial</type>    <description>      <p>      Resin allows servlets to be configured using dependency injection.      </p>    </description>    <tutorial-startpage>hello</tutorial-startpage>  </header>  <body>    <summary/><s1><p>With Resin, servlets can use Java Bean-style configuration.  A "Java Bean"is just a Java class that follows a simple set of rules.  Each configurationparameter <var>foo</var> has a corresponding setter method<code>setFoo</code> with a single argument for the value.  Resin canlook at the class using Java's reflection and find the <code>setFoo</code>method.  Because Resin can find the bean-style setters from looking at theclass, it can configure those setters in a configuration filelike the web.xml.</p></s1><s1 title="Files in this tutorial"><deftable><tr><td><viewfile-link file="WEB-INF/web.xml"/>    </td><td>Configures the Servlet with bean-style init</td></tr><tr><td><viewfile-link file="WEB-INF/classes/test/HelloServlet.java"/>    </td><td>The servlet implementation.</td></tr></deftable></s1><s1 title="HelloServlet"><p>The following <code>HelloServlet</code> servlet is a trivial bean-styleservlet.  Instead of hardcoding the "Hello, world" string, it lets theweb.xml configure the string as <var>greeting</var>.  To make that work,<code>HelloWorld</code> adds a bean-style <code>setGreeting(String)</code>jmethod.<example title="WEB-INF/classes/test/HelloServlet.java">package test;import java.io.*;import javax.servlet.http.*;import javax.servlet.*;public class HelloServlet extends HttpServlet {  private String _greeting = "Default";  public void setGreeting(String greeting)  {    _greeting = greeting;  }  public void doGet (HttpServletRequest req,                     HttpServletResponse res)    throws ServletException, IOException  {    PrintWriter out = res.getWriter();    out.println(_greeting);    out.close();  }}</example></p></s1><s1 title="Configuration"><p>The <a config-tag="servlet"/> configuration sets the <var>greeting</var> propertyinside an <a config-tag="init/servlet"/> tag.  After Resin instantiates the servlet object,it looks at the configuration file for any &lt;init&gt; section.  Resin thencalls a <code>setXXX</code> method for each <var>&lt;xxx&gt;</var> tag in&lt;init&gt;.  In this case, Resin will call <code>setGreeting</code></p><p>Resin will perform any type conversion necessary, so you can useintegers and doubles as well as strings.  After Resin calls the <code>setXXX</code> methods, it will call the <code>init(ServletConfig)</code> method.</p><p>When Resin initializes the servlet, it will makethe following calls:</p><ol><li><code>servlet = new test.HelloServlet();</code></li><li><code>servlet.setGreeting("Hello, World!");</code></li><li><code>servlet.init(servletConfig);</code></li></ol><example title="WEB-INF/web.xml">&lt;web-app xmlns="http://caucho.com/ns/resin"&gt;  &lt;servlet servlet-name="hello"            servlet-class="test.HelloServlet"&gt;    &lt;init&gt;      &lt;greeting&gt;Hello, World!&lt;/greeting&gt;    &lt;/init&gt;  &lt;/servlet&gt;  &lt;servlet-mapping url-pattern="/hello"            servlet-name="hello"/&gt;&lt;/web-app&gt;</example></s1>  </body></document>
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