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Java > Open Source Codes > example > HelloServlet


1 package example;
2
3 import java.util.*;
4 import java.io.*;
5 import javax.servlet.*;
6 import javax.servlet.http.*;
7 import freemarker.template.*;
8
9 /**
10  * This Servlet does not do anything useful, just prints "Hello World!". The
11  * intent is to help you to get started if you want to build your own Controller
12  * servlet that uses FreeMarker for the View. For more advanced example, see the
13  * 2nd Web application example.
14  */
15 public class HelloServlet extends HttpServlet {
16     private Configuration cfg;
17     
18     public void init() {
19         // Initialize the FreeMarker configuration;
20 // - Create a configuration instance
21 cfg = new Configuration();
22         // - Templates are stoted in the WEB-INF/templates directory of the Web app.
23 cfg.setServletContextForTemplateLoading(
24                 getServletContext(), "WEB-INF/templates");
25         // In a real-world application various other settings should be explicitly
26 // set here, but for the sake of brevity we leave it out now. See the
27 // "webapp2" example for them.
28 }
29     
30     protected void doGet(HttpServletRequest req, HttpServletResponse resp)
31         throws ServletException, IOException {
32         
33         // Build the data-model
34 Map root = new HashMap();
35         root.put("message", "Hello World!");
36         
37         // Get the templat object
38 Template t = cfg.getTemplate("test.ftl");
39         
40         // Prepare the HTTP response:
41 // - Use the charset of template for the output
42 // - Use text/html MIME-type
43 resp.setContentType("text/html; charset=" + t.getEncoding());
44         Writer out = resp.getWriter();
45         
46         // Merge the data-model and the template
47 try {
48             t.process(root, out);
49         } catch (TemplateException e) {
50             throw new ServletException(
51                     "Error while processing FreeMarker template", e);
52         }
53     }
54 }
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