[Spring] Email 발송하기

 최근에 임의로 채번된 비밀번호를 발송하기 위한 메일링 서비스를 제작하면서 한번 작성해볼까 합니다. 저는 일단 Gmail 계정 기준으로 했지만, SMTP설정에 따라 다르게 발송 가능합니다.

 

1. Gmail 계정 준비하기

 - 따로 쓸 말이 없네요

 

2. Gmail SMTP 보안 설정

 - myaccount.google.com/security?gar=1

 

3. 관련 Libriary 설정

 - pom.xml

        <!-- Mail -->
        <dependency>
            <groupId>javax.mail</groupId>
            <artifactId>mail</artifactId>
            <version>1.4.7</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-context-support</artifactId>
            <version>${org.springframework-version}</version>
        </dependency>

 

4. Properties 설정

 - WEB-INF > config > email.properties

email.account=이메일주소@gmail.com
email.password=비밀번호

 

 - WEB-INF > config > email-config.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:context="http://www.springframework.org/schema/context"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
                        http://www.springframework.org/schema/beans/spring-beans.xsd
                        http://www.springframework.org/schema/context
                        http://www.springframework.org/schema/context/spring-context-4.2.xsd">
 
    <context:property-placeholder location="/WEB-INF/config/email.properties"/>
 
    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="smtp.gmail.com" />
        <property name="port" value="465" />
        <property name="username" value="${email.account}" />
        <property name="password" value="${email.password}" />
        
        <property name="javaMailProperties">
            <props>
                <prop key="mail.transport.protocol">smtp</prop>
                <prop key="mail.smtp.auth">true</prop>
                <prop key="mail.smtp.socketFactory.class">javax.net.ssl.SSLSocketFactory</prop>
                <prop key="ail.smtp.starttls.enable">true</prop>
                <prop key="mail.debug">true</prop>
            </props>
        </property>
    </bean>
</beans>

 

5. Handler 작성

import java.io.UnsupportedEncodingException;

import javax.activation.DataSource;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
 
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
 
public class MailHandler {
    private JavaMailSender mailSender;
    private MimeMessage msg;
    private MimeMessageHelper msgHelper;
 
    public MailHandler(JavaMailSender mailSender) throws MessagingException {
        this.mailSender = mailSender;
        msg = this.mailSender.createMimeMessage();
        msgHelper = new MimeMessageHelper(msg, true, "UTF-8");
    }
    
    // Email Title
    public void setSubject(String subject) throws MessagingException {
        msgHelper.setSubject(subject);
    }
    
    // Email Content(Text)
    public void setText(String htmlContent) throws MessagingException {
        msgHelper.setText(htmlContent, true);
    }
    
    // Sender Info
    public void setFrom(String email, String name) throws UnsupportedEncodingException, MessagingException {
        msgHelper.setFrom(email, name);
    }
    
    // Recipient Info
    public void setTo(String email) throws MessagingException {
        msgHelper.setTo(email);
    }
    
    public void addInline(String cotentId, DataSource dataSource) throws MessagingException {
        msgHelper.addInline(cotentId, dataSource);
    }
    
    public void send() {
        try {
            mailSender.send(msg);
        }catch (Exception e) {
            e.printStackTrace();
        }
    }
}

 

5. 메일링 서비스 사용

@Controller
public class RestfulController extends FrontendController{
    @Inject private JavaMailSender mailSender;
    
    /**
     * 메일발송
     * @return
     */
    @RequestMapping(value="sendMail", method=RequestMethod.GET)
    public HashMap<String, Object> sendMail(){
        HashMap<String, Object> result = new HashMap<String, Object>();

		this.sendEmail("받는사람@gmail.com", "메일제목", "메일내용");
        
        return result;
    }
	
    private void sendEmail(String emailAddr, String title, String contents) {
        try {
            //메일 전송
            MailHandler sendMail = new MailHandler(mailSender);
            sendMail.setSubject(title);
            sendMail.setText(contents);
            
            sendMail.setFrom("이메일@gmail.com", "발송자 이름");
            sendMail.setTo(emailAddr);
            sendMail.send();
        }catch(Exception e) {
            e.printStackTrace();
        }
    }
}