获取邮箱授权码

打开POP3/SMTP服务
复制授权码

pom.xml导入依赖

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

修改application.yml

spring:
  mail:
    host: smtp.163.com
    username: 邮箱名
    password: 授权码
    port: 465
    protocol: smtp
    default-encoding: UTF-8
    properties:
      mail:
        smtp:
          ssl:
            enable: true
          socketFactory:
            port: 465
            class: javax.net.ssl.SSLSocketFactory
      debug: true

调用JavaMailSender发送邮件

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.springframework.util.ObjectUtils;

import java.util.Date;
import java.util.List;

@Service
public class MailServiceImpl {
    private static final Logger logger = LoggerFactory.getLogger(MailServiceImpl .class);
    /**
     * 注入邮件工具类
     */
    @Autowired(required = false)
    private JavaMailSender javaMailSender;

    @Value("${spring.mail.username}")
    private String sendMailer; // 发送者邮箱

	/**
	* receivers: 接收者邮箱
	*/
    @Override
    public void sendTextMailMessage(List<String> receivers, String subject, String content) {
        try {
            logger.info("发送：{} -> {}", sendMailer, receivers);
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(javaMailSender.createMimeMessage(), true);
            mimeMessageHelper.setFrom(sendMailer);
            mimeMessageHelper.setTo(receivers.toArray(String[]::new));
            //邮件主题
            mimeMessageHelper.setSubject(subject);
            //邮件内容
            mimeMessageHelper.setText(content);
            //邮件发送时间
            mimeMessageHelper.setSentDate(new Date());

            //发送邮件
            javaMailSender.send(mimeMessageHelper.getMimeMessage());
            logger.info("发送邮件成功：{} -> {}", sendMailer, receivers);
        } catch (Exception e) {
            logger.error("发送邮件失败：{} -> {}", sendMailer, receivers);
            logger.error("发送邮件失败", e);
            throw new BusinessException(LarkPassRestResultCode.ERROR, "发送邮件失败");
        }
    }
}