example: public class: HelloServlet

example
public class: HelloServlet [javadoc | source]

java.lang.Object
   javax.servlet.GenericServlet
      javax.servlet.http.HttpServlet
         example.HelloServlet

All Implemented Interfaces:
Serializable, Servlet, ServletConfig

This Servlet does not do anything useful, just prints "Hello World!". The intent is to help you to get started if you want to build your own Controller servlet that uses FreeMarker for the View. For more advanced example, see the 2nd Web application example.

Method from example.HelloServlet Summary:
doGet, init

Methods from javax.servlet.http.HttpServlet:
service

Methods from javax.servlet.GenericServlet:
destroy, getInitParameter, getInitParameterNames, getServletConfig, getServletContext, getServletInfo, getServletName, init, init, log, log, service

Methods from java.lang.Object:
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method from example.HelloServlet Detail:
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws IOException, ServletException { // Build the data-model Map root = new HashMap(); root.put("message", "Hello World!"); // Get the templat object Template t = cfg.getTemplate("test.ftl"); // Prepare the HTTP response: // - Use the charset of template for the output // - Use text/html MIME-type resp.setContentType("text/html; charset=" + t.getEncoding()); Writer out = resp.getWriter(); // Merge the data-model and the template try { t.process(root, out); } catch (TemplateException e) { throw new ServletException( "Error while processing FreeMarker template", e); } }
public void init() { // Initialize the FreeMarker configuration; // - Create a configuration instance cfg = new Configuration(); // - Templates are stoted in the WEB-INF/templates directory of the Web app. cfg.setServletContextForTemplateLoading( getServletContext(), "WEB-INF/templates"); // In a real-world application various other settings should be explicitly // set here, but for the sake of brevity we leave it out now. See the // "webapp2" example for them. }

Method from example.HelloServlet Detail:

 protected  void doGet(HttpServletRequest req,
    HttpServletResponse resp) throws IOException, ServletException {
        
        // Build the data-model
        Map root = new HashMap();
        root.put("message", "Hello World!");
        // Get the templat object
        Template t = cfg.getTemplate("test.ftl");
        // Prepare the HTTP response:
        // - Use the charset of template for the output
        // - Use text/html MIME-type
        resp.setContentType("text/html; charset=" + t.getEncoding());
        Writer out = resp.getWriter();
        // Merge the data-model and the template
        try {
            t.process(root, out);
        } catch (TemplateException e) {
            throw new ServletException(
                    "Error while processing FreeMarker template", e);
        }
}

 public  void init() {
        // Initialize the FreeMarker configuration;
        // - Create a configuration instance
        cfg = new Configuration();
        // - Templates are stoted in the WEB-INF/templates directory of the Web app.
        cfg.setServletContextForTemplateLoading(
                getServletContext(), "WEB-INF/templates");
        // In a real-world application various other settings should be explicitly
        // set here, but for the sake of brevity we leave it out now. See the
        // "webapp2" example for them.
}