SpringBoot整合邮箱发送验证码

1、以QQ邮箱为例，点开设置开启POP3/SMTP服务

2、创建一个springboot项目

1）引入maven依赖

            org.springframework.boot
            spring-boot-starter-mail

2)配置yml文件

spring:
  mail:
    # 配置 SMTP 服务器地址
    host: smtp.qq.com
    # 发送者邮箱
    username: 1234567@qq.com
    # 配置密码，注意不是真正的密码，而是刚刚申请到的授权码
    password: etorqsqmpsrtbada
    # 端口号465或587
    port: 587
    # 默认的邮件编码为UTF-8
    default-encoding: UTF-8
    # 配置SSL 加密工厂
    properties:
      mail:
        smtp:
          socketFactoryClass: javax.net.ssl.SSLSocketFactory
        #表示开启 DEBUG 模式，这样，邮件发送过程的日志会在控制台打印出来，方便排查错误
        debug: true

3)创建controller

package com.atguigu.msmservice.controller;

import com.atguigu.commonutils.R;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.mail.MailException;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.web.bind.annotation.*;

import javax.annotation.Resource;

import java.util.Random;
import java.util.concurrent.TimeUnit;

@RestController
@RequestMapping("/messervice/email")
@CrossOrigin
public class EmailController {
    @Autowired
    private RedisTemplate redisTemplate;
    @Resource
    private JavaMailSender javaMailSender;

    //读取yml文件中username的值并赋值给form
    @Value("${spring.mail.username}")
    private String from;

    @GetMapping("/sendEmail/{emailReceiver}")
    public R sendSimpleMail(@PathVariable String emailReceiver) {
        // 构建一个邮件对象
        SimpleMailMessage message = new SimpleMailMessage();
        // 设置邮件发送者
        message.setFrom(from);
        // 设置邮件接收者
        message.setTo(emailReceiver);
        // 设置邮件的主题
        message.setSubject("登录验证码");
        // 设置邮件的正文
        Random random = new Random();
        StringBuilder code = new StringBuilder();
        for (int i = 0; i < 6; i++) {
            int r = random.nextInt(10);
            code.append(r);
        }
        String text = "您的验证码为：" + code + ",请勿泄露给他人。";
        message.setText(text);

        // 发送邮件
        try {
            javaMailSender.send(message);
            //将验证码保存到redis缓存中，设置有效时间为5分钟
            redisTemplate.opsForValue().set(emailReceiver, String.valueOf(code),5, TimeUnit.MINUTES);
            return R.ok();
        } catch (MailException e) {
            e.printStackTrace();
        }
        return R.error().message("发送失败");
    }
}

测试，输入收件人的邮箱