Spring - Sending E-Mail with MailSender

Sending email using Spring "org.springframework.mail.javamail.JavaMailSenderImpl" class simplifies the process with JavaMail API. Below example will give step by step to send email by using Gmail SMTP server configurations.

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 <modelVersion>4.0.0</modelVersion>
 <groupId>org.springframework.samples</groupId>
 <artifactId>SendingEmail</artifactId>
 <version>0.0.1-SNAPSHOT</version>

 <dependencies>

  <!-- Spring framework -->
  <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring</artifactId>
   <version>2.5.6.SEC03</version>
  </dependency> 

  <!-- Java Mail API -->
  <dependency>
   <groupId>javax.mail</groupId>
   <artifactId>mail</artifactId>
   <version>1.4.3</version>
  </dependency>

 </dependencies>
</project>

email.xml

<beans xmlns="http://www.springframework.org/schema/beans"
 xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 xsi:schemaLocation="http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd">

 <bean id="emailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
  <property name="host" value="smtp.gmail.com" />
  <property name="port" value="587" />
  <property name="username" value="USERNAME" />
  <property name="password" value="PASSWORD" />

  <property name="javaMailProperties">
   <props>
    <prop key="mail.smtp.auth">true</prop>
    <prop key="mail.smtp.starttls.enable">true</prop>
   </props>
  </property>
 </bean>

 <bean id="emailBean" class="com.app.email.Mailer">
  <property name="emailSender" ref="emailSender" />
 </bean>

</beans>

Mailer.java

package com.app.email;

import org.springframework.mail.MailSender;
import org.springframework.mail.SimpleMailMessage;

public class Mailer {

 private MailSender emailSender;
 
 //Setter for emailSender
 public void setEmailSender(MailSender emailSender) {
  this.emailSender = emailSender;
 }
 
 //Method to send email
 public void sendMail(String from, String to, String subject, String msg) {

  SimpleMailMessage simpleMsg = new SimpleMailMessage();
  
  simpleMsg.setFrom(from);
  simpleMsg.setTo(to);
  simpleMsg.setSubject(subject);
  simpleMsg.setText(msg);
  
  //Finally sending email using MailSender
  emailSender.send(simpleMsg); 
 }
}

SendEmail.java

package com.app.email;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class SendEmail {

 public static void main(String[] args) {

  String from = "from@gmail.com";
  String to = "to@gmail.com";
  String subject = "Hello World !";
  String msg = "Hello World, How are you ???";

  ApplicationContext context = new ClassPathXmlApplicationContext("email.xml");

  try {
   Mailer mailer = (Mailer) context.getBean("emailBean");
   mailer.sendMail(from, to, subject, msg);

  } catch (Exception e) {
   e.printStackTrace();
  }
 }
}