<dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-mail</artifactId>

  </dependency>

server.port=

spring.mail.host=smtp.qq.com

spring.mail.username=自己的qq邮箱

spring.mail.password=密码，不是登陆密码，是开启smtp的授权码

spring.mail.default-encoding=UTF-

spring.mail.port=

spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory

spring.mail.properties.mail.debug=true

package com.rocketmq.demo.Utils;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.core.io.FileSystemResource;

import org.springframework.mail.javamail.JavaMailSender;

import org.springframework.mail.javamail.MimeMessageHelper;

import org.springframework.stereotype.Component;

import javax.mail.internet.MimeMessage;

import java.io.File;

@Component

public class SendMailUtil {

    @Autowired

    JavaMailSender mailSender;

    /**

     * 发送文本消息

     * @param senderMail    发送者邮箱

     * @param receiveMail   接受者邮箱

     * @param subject   主题

     * @param text  主体内容

     * @return

     */

    public  String  sendMail(String senderMail,String receiveMail,String subject,String text){

        try {

            final MimeMessage message = this.mailSender.createMimeMessage();

            final MimeMessageHelper helper = new MimeMessageHelper(message);

            helper.setFrom(senderMail);//发送者邮箱

            helper.setTo(receiveMail);//接收者邮箱

            helper.setSubject(subject);

            helper.setText(text);

            this.mailSender.send(message);

            return "sucesss";

        } catch (Exception ex) {

            ex.printStackTrace();

            return "error";

        }

    }

    /**

     * 带附件发送邮件----可多个附件 图片，doc都可以发送

     * @param senderMail  发送者邮箱

     * @param receiveMail 接受者邮箱

     * @param subject   主题

     * @param text      主体内容

     * @param fileArray    附件路径

     * @return

     */

    public  String  sendMailFile(String senderMail,String receiveMail,String subject,String text,String[] fileArray) {

        try {

            MimeMessage message = mailSender.createMimeMessage();

            MimeMessageHelper helper = new MimeMessageHelper(message, true);

            helper.setFrom(senderMail);

            helper.setTo(receiveMail);

            helper.setSubject(subject);

            helper.setText(text);

            //验证文件数据是否为空

            if (null != fileArray) {

                FileSystemResource file = null;

                for (int i = 0; i < fileArray.length; i++) {

                    //添加附件

                    file = new FileSystemResource(fileArray[i]);

                    helper.addAttachment(fileArray[i].substring(fileArray[i].lastIndexOf(File.separator)), file);

                }

            }

            mailSender.send(message);

            System.out.println("带附件的邮件发送成功");

            return "sucesss";

        } catch (Exception e) {

            e.printStackTrace();

            System.out.println("发送带附件的邮件失败");

            return "error";

        }

    }

}

package com.rocketmq.demo.controller;

import com.rocketmq.demo.Utils.SendMailUtil;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.web.bind.annotation.GetMapping;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.ResponseBody;

import org.springframework.web.bind.annotation.RestController;

@RestController

@RequestMapping("/mail")

public class mailController {

    @Autowired

    SendMailUtil sendMailUtil;

    /**

     * 发送文本消息，不带附件

     * @return

     */

    @ResponseBody

    @RequestMapping("/send")

    public Object sendEmail() {

        String senderMial = "发送者@qq.com";

        String receiveMail = "接收者@qq.com";

        String subject = "测试主题";

        String text = "测试内容";

        return sendMailUtil.sendMail(senderMial,receiveMail,subject,text);

    }

    @GetMapping("/sendFile")

    public String sendAttachmentsMail() {

        String senderMial = "发送者@qq.com";

        String receiveMail = "接收者@qq.com";

        String subject = "测试主题";

        String text = "测试内容";

        String[] path={"C:\\Users\\yangwj\\Desktop\\公司\\正式员工详细信息表.xls"};

        return  sendMailUtil.sendMailFile(senderMial,receiveMail,subject,text,path);

    }

}