Spring Mail

Spring Mail

2020/04/14 (新增連結)

基本概念

Spring Mail是基於JavaMail，可以利用JavaMail透過SMTP送出email，也可以利用pop3或imap去mail server讀取email。我們最常使用的就是利用SMTP送出email，以下就只提供SMTP這部份的範例。

設定

pom.xml需要:

   <dependency>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-mail</artifactId>
  </dependency>

application.properties (以gmail為例)

spring.mail.host = smtp.gmail.com
spring.mail.username = xxxx@gmail.com
spring.mail.password = xxxx
send.from.email= xxxx@gmail.com
spring.mail.properties.mail.smtp.auth = true;
spring.mail.properties.mail.smtp.starttls.enable = true
spring.mail.properties.mail.smtp.ssl.enable = true
spring.mail.properties.mail.socketFactory.port=587
spring.mail.properties.mail.socketFactory.class=javax.net.ssl.SSLSocketFactory
spring.mail.properties.mail.socketFactory.fallback=false
spring.mail.smtp.port= 587
package com.example.demo.controller;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import com.example.demo.service.MailService;

@Controller
public class MailController {
  @Autowired
 private MailService mailService;
 
 @GetMapping("/")
 @ResponseBody
 public String hello(){
  mailService.prepareAndSend("053792@fju.edu.tw","Sample mail subject");
  return "Mail sent";
 }
 

}

MailService.java

package com.example.demo.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.MailException;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.mail.javamail.MimeMessagePreparator;
import org.springframework.stereotype.Service;

@Service
public class MailService {
 
    private JavaMailSender mailSender;
 
    @Autowired
    public MailService(JavaMailSender mailSender) {
        this.mailSender = mailSender;
    }
 
    public void prepareAndSend(String recipient, String message) {
       MimeMessagePreparator messagePreparator = mimeMessage -> {
             MimeMessageHelper messageHelper = new MimeMessageHelper(mimeMessage);
             messageHelper.setFrom("jitsung.wu@gmail.com");
             messageHelper.setTo(recipient);
             messageHelper.setSubject(message);
             messageHelper.setText(message);
         };
         try {
             mailSender.send(messagePreparator);
             //System.out.println("sent");
         } catch (MailException e) {
             //System.out.println(e);
             // runtime exception; compiler will not force you to handle it
         }
    }
 
}

參考資料