Use velocity templates to build email

pom.xml

@@ -38,6 +38,10 @@
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
 		</dependency>
+		<dependency>
+			<groupId>org.apache.velocity</groupId>
+			<artifactId>velocity</artifactId>
+		</dependency>
 		<dependency>
 			<groupId>org.scala-lang</groupId>
 			<artifactId>scala-library</artifactId>

src/main/java/es/urjc/code/dad/mail/batch/StudentItemProcessor.java

@@ -1,14 +1,19 @@
 package es.urjc.code.dad.mail.batch;
 
+import java.util.HashMap;
+import java.util.Map;
+
 import javax.mail.internet.MimeMessage;
 
+import org.apache.velocity.app.VelocityEngine;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.batch.item.ItemProcessor;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.core.io.FileSystemResource;
 import org.springframework.mail.javamail.JavaMailSender;
 import org.springframework.mail.javamail.MimeMessageHelper;
+import org.springframework.ui.velocity.VelocityEngineUtils;
 
 import es.urjc.code.dad.mail.batch.model.Student;
 
@@ -18,6 +23,8 @@ public class StudentItemProcessor implements ItemProcessor<Student, MimeMessage>
 
 	@Autowired
 	private JavaMailSender mailSender;
+	@Autowired
+	private VelocityEngine engine;
 	private String sender;
 	private String attachment;
 
@@ -32,10 +39,13 @@ public MimeMessage process(Student student) throws Exception {
 
 		MimeMessageHelper helper = new MimeMessageHelper(message, true);
 
-		helper.setSubject("Your code");
+		Map<String, Object> model = new HashMap<>();
+		model.put("name", student.getFullname());
+		model.put("code", student.getCode());
 		helper.setFrom(sender);
 		helper.setTo(student.getEmail());
-		helper.setText("This is your code: " + student.getCode() + ".\nFind instructions attached to this email.");
+		helper.setSubject(VelocityEngineUtils.mergeTemplateIntoString(engine, "email-subject.vm", "UTF-8", model));
+		helper.setText(VelocityEngineUtils.mergeTemplateIntoString(engine, "email-body.vm", "UTF-8", model));
 
 		log.info("Preparing message for: " + student.getEmail());
 

src/main/resources/templates/email-body.vm

@@ -0,0 +1,7 @@
+Hi, $name
+
+This is your code: $code
+
+Find instructions attached to this email.
+
+Regards.

src/main/resources/templates/email-subject.vm

@@ -0,0 +1 @@
+Your code