环境

jdk17
springboot版本3.2.1

依赖包

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-mail</artifactId>
     <version>3.1.4</version>
</dependency>

yml配置

我用的是qq邮箱，port是465
如果用的是其他的邮箱，自己修改这个端口，可能是25
ssl：true这个必须配置，不加会报错

不要复制，自己输，复制格式会出错
邮箱就自己的邮箱
秘密要开启stmp的时候系统给那个，不是自己设置的qq邮箱秘密

spring:
  mail:
    host: smtp.qq.com
    port: 465
    username: xxxx@qq.com
    password: xxxx
    default-encoding: UTF-8
    properties:
      mail:
        smtp:
          auth: true
          ssl:
            enable: true

Service层

把setFrom里的邮箱换成自己的，就yml中配置那个

package com.example.demo;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

@Service
public class EmailService {
    @Autowired
    private JavaMailSender javaMailSender;

    public void sendSimpleEmail(String to, String subject, String text) {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom("xxx@qq.com");
        message.setTo(to);
        message.setSubject(subject);
        message.setText(text);

        javaMailSender.send(message);
    }
}

Controller层

to后面的是收件人地址

package com.example.demo;

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.RestController;

@RestController
@RequestMapping("/email")
public class EmailController {
    @Autowired
    private EmailService emailService;

    @GetMapping("/send")
    public String sendEmail() {
        String to = "xxx@qq.com";
        String subject = "邮件提醒";
        String text = "这是一条测试邮件";

        emailService.sendSimpleEmail(to, subject, text);

        return "邮件发送成功";
    }
}

测试

用postman直接请求对应的接口地址
不需要任何参数
测试结果如下