Email (electronic mail) is an effective medium to reach out to masses. In application, a need may arise to use email as mean of communicating with customers. A notification mail has to be send when someone post comment or transaction has been successfully completed etc.
A simple email service can be prepared within application with few steps. All we need is, mail sender service and a template.
Dependencies
commons-codec-1.6.jar
commons-collections-3.2.1.jar
commons-lang-2.5.jar
mail-1.4.4.jar
spring-context-support-3.2.2.RELEASE.jar
spring-core-3.2.3.RELEASE.jar
velocity-1.7.jar
Complete Code:
final String fromEmail = "from@gmail.com";
final String toEmail = "to@gmail.com";
private JavaMailSender javaMailSender;
public String templateSetup(Map<String, Object> properties, String templateName){
final VelocityEngine velocityEngine = new VelocityEngine();
velocityEngine.setProperty(RuntimeConstants.RESOURCE_LOADER, "classpath");
velocityEngine.setProperty("classpath.resource.loader.class", ClasspathResourceLoader.class.getName());
velocityEngine.init();
VelocityContext context = new VelocityContext();
context.put("date", new Date());
final Template template = velocityEngine.getTemplate(templateName);
StringWriter writer = new StringWriter();
template.merge(context, writer);
return VelocityEngineUtils.mergeTemplateIntoString(velocityEngine, template.getName(), "UTF-8", properties);
}
public JavaMailSender serverSetup(String password){
JavaMailSenderImpl impl = new JavaMailSenderImpl();
impl.setHost("smtp.gmail.com");
impl.setPort(587);
impl.setUsername("from@gmail.com");
impl.setPassword(password);
Properties mailProp = new Properties();
mailProp.setProperty("mail.smtp.auth", "true");
mailProp.setProperty("mail.smtp.starttls.enable", "true");
impl.setJavaMailProperties(mailProp);
javaMailSender = impl;
return javaMailSender;
}
public void sendMail(String password, final String templateName, final String subject) throws Exception {
final Map<String, Object> properties = new HashMap<String, Object>();
properties.put("message", "Hello world!");
MimeMessagePreparator p = new MimeMessagePreparator() {
@Override
public void prepare(MimeMessage mimeMessage) throws Exception {
MimeMessageHelper message = new MimeMessageHelper(mimeMessage, true);
message.setTo(toEmail);
message.setFrom(new InternetAddress(fromEmail));
message.setSubject(subject);
message.setText(templateSetup(properties, templateName), true);
}
};
javaMailSender.send(p);
}
public static void main(String[] args) {
MimeMailSender mail = new MimeMailSender();
String password = "";
try {
System.out.print("Enter your password : ");
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
password = br.readLine().trim();
mail.serverSetup(password);
br.close();
mail.sendMail(password, "user.vm","This is test");
} catch (Exception e) {
e.printStackTrace();
}
}
Template : user.vm
<html>
<head>
</head>
<body>
<div>${message}</div>
</body>
</html>