1 import java.io.StringWriter;
 2 import java.util.HashMap;
 3 import java.util.Properties;
 4 
 5 import org.apache.velocity.Template;
 6 import org.apache.velocity.VelocityContext;
 7 import org.apache.velocity.app.VelocityEngine;
 8 import org.apache.velocity.runtime.resource.loader.ClasspathResourceLoader;
 9 
10 
11 public class Emailer
12 {
13     /**
14      * Field description
15      *
16      * @since 1.0
17      */
18     VelocityEngine engine = new VelocityEngine();
19 
20     /**
21      * Constructor description.
22      *
23      * @throws Exception Description
24      */
25     public Emailer() throws Exception
26     {
27         configure(engine);
28     }
29 
30     /**
31      * "Sends" (actually writes to System.out for demonstration  purposes) a
32      * receipt e-mail for the specified order.
33      *
34      * @param order Description
35      */
36     public void sendReceipt(Order order) throws Exception
37     {
38         Template template = engine.getTemplate("email.vm");
39         VelocityContext context = createContext();
40         context.put("order", order);
41 
42         StringWriter writer = new StringWriter();
43         template.merge(context, writer);
44         writer.close();
45         System.out.println("To: " + order.getCustomer().getEmail());
46         System.out.println("Subject: " + context.get("subject"));
47         System.out.println(writer.getBuffer());
48     }
49 
50     /**
51      * Configures the engine to use classpath to find templates
52      *
53      * @param engine Description
54      */
55     private void configure(VelocityEngine engine) throws Exception
56     {
57         Properties props = new Properties();
58         props.setProperty(VelocityEngine.RESOURCE_LOADER, "classpath");
59         props.setProperty("classpath." + VelocityEngine.RESOURCE_LOADER +
60                           ".class",
61                           ClasspathResourceLoader.class.getName());
62         engine.init(props);
63     }
64     /**
65       * Creates a Velocity context and adds a formatter tool
66       * and store information.
67       */
68      private VelocityContext createContext() {
69        VelocityContext context = new VelocityContext();
70        context.put("formatter", new Formatter());
71 
72        HashMap store = new HashMap();
73        store.put("name", "Amazon.com Bookstore");
74        store.put("url", "http://amazon.comm");
75 
76        context.put("store", store);
77        return context;
78      }
79 }
80