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

spring:
 rabbitmq:
  addresses: 127.0.0.1
  username: guest
  password: guest
  port: 5672

package com.lytw13.demo.controller;

import com.lytw13.demo.model.TbUser;
import com.lytw13.demo.service.UserService;
import com.lytw13.demo.util.MailUtil;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("user")
public class UserController {
  @Autowired
  UserService userService;
  @Autowired
  RabbitTemplate rabbitTemplate;

  @PostMapping("save")
  public void save(@RequestBody TbUser user) {
    userService.save(user);
    rabbitTemplate.convertAndSend("email.direct","email.direct",user);
  }

}

public void save(TbUser user) {
    long startTime = System.currentTimeMillis();
    userMapper.insert(user);
    long endTime = System.currentTimeMillis();
    System.out.println("耗時(shí)："+(endTime-startTime));
  }

  @RabbitListener(queues = "email.direct")
  public void sendEmail(TbUser user) {
    List<String> fileList = new ArrayList<>();
    fileList.add("E:\\others\\MyBlog\\新建文本文檔1.txt");
    fileList.add("E:\\others\\MyBlog\\新建文本文檔.txt");
    MailUtil.sendHtmlTemplateMail(user.getEmail(),user.getName(),fileList);
  }