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

package com.springbootemaildemo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.scheduling.annotation.EnableScheduling;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
/**
 * 引入了一個注解@EnableSwagger2來啟動swagger注解。（啟動該注解使得用在controller中的swagger注解生效， 覆蓋的范圍由@ComponentScan的配置來指定，
 * 這里默認指定為根路徑”com.springboot”下的所有controller）
 * 也可以單獨寫衣swaggerConfigura
 */
@EnableScheduling //啟動定時任務
@EnableSwagger2 //啟動swagger注解
@SpringBootApplication
public class MailApplication {
  public static void main(String[] args) {
    SpringApplication.run(MailApplication.class, args);
  }
}

package com.springbootemaildemo.job;

import com.springbootemaildemo.send.SendMail;
import com.springbootemaildemo.send.TenSenvenMail;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.scheduling.annotation.EnableScheduling;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Component;

import javax.annotation.Resource;

@Component
@EnableScheduling
public class MailJob {
  private static final Logger logger = LoggerFactory.getLogger(MailJob.class);

  @Resource
  SendMail sendMail;

  @Resource
  TenSenvenMail tenSenvenMail;

  //@Scheduled(cron = "0/5 * * * * ?")
  //或直接指定時間間隔，例如：100秒
  // @Scheduled(fixedRate=100000)
  //早晨7點
  @Scheduled(cron = "0 0 7 * * ?")
  public void sendJob() {
    String bodyTen = "早安哇,太陽出來啦，記得開心喲";
    String bodyWen = "記得開心喲";
    logger.info("定時任務開始..........................");
    sendMail.sendWen(bodyWen);
    tenSenvenMail.sendTen(bodyTen);
    logger.info("定時任務結束..........................");
  }
}

package com.springbootemaildemo.send;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;

import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;
import java.util.Date;
import java.util.Properties;


@Component
public class SendMail {
  private static final Logger logger = LoggerFactory.getLogger(SendMail.class);

  public void sendWen(String body) {
    logger.info("開始發送..................");
    String from = "212212@qq.com";
    String to = "5456456@qq.com";
    String subject = "HAPPY";
    String smtpHost = "smtp.qq.com";
    Properties props = new Properties();
    props.setProperty("mail.transport.protocol", "smtp"); // 使用的協議（JavaMail規范要求）
    props.setProperty("mail.smtp.host", smtpHost); // 發件人的郵箱的 SMTP服務器地址
    props.setProperty("mail.smtp.auth", "true"); // 請求認證，參數名稱與具體實現有關

    // 創建Session實例對象
    Session session = Session.getDefaultInstance(props);
    // 創建MimeMessage實例對象
    MimeMessage message = new MimeMessage(session);
    // 設置發件人
    try {
      message.setFrom(new InternetAddress(from));
      // 設置收件人
      message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
      // 設置發送日期
      message.setSentDate(new Date());
      // 設置郵件主題
      message.setSubject(subject);
      // 設置純文本內容的郵件正文
      message.setText(body);
      // 保存并生成最終的郵件內容
      message.saveChanges();
      // 設置為debug模式, 可以查看詳細的發送 log
      session.setDebug(true);
      // 獲取Transport對象
      Transport transport = session.getTransport("smtp");
      // 第2個參數需要填寫的是QQ郵箱的SMTP的授權碼，什么是授權碼，它又是如何設置？
      transport.connect(from, "ipeiquufachheefg");
      // 發送，message.getAllRecipients() 獲取到的是在創建郵件對象時添加的所有收件人, 抄送人, 密送人
      transport.sendMessage(message, message.getAllRecipients());
      logger.info("發送完成");
      transport.close();
    } catch (MessagingException e) {
      e.printStackTrace();
    }
  }
}