1、设置QQ邮箱为邮件发送服务器

1）、登录QQ邮箱

2）、点击设置

3）、选择账号

4）、获取 授权码

在 POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务 选项下面

• 点击 继续获取授权码

• 安全验证：点击 前往绑定

• 发送短信：点击 我已发送

• 获取验证码

• 生成授权码

• 发送短信获取授权码

• 返回安全设置，查看 配置 SMTP/IMAP 方法

2、修改配置文件

# 邮件发送----------------------------------------------------
# 邮件服务器
email.host = smtp.qq.com
# 用户名
email.username = 3350996729@qq.com
# 发送密码
email.password = rclipochic

3、创建接口

package com.shenmazong.zg2.controller;

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.Controller;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;

/**
 * @author 军哥
 * @version 1.0
 * @description: 邮件发送接口
 * @date 2023/10/14 20:56
 */

@Controller
@RequestMapping(value = "/mail")
public class MailController {

    @Autowired
    JavaMailSender javaMailSender;

    /***
     * @description 发送没有附件的邮件
     * @params
     * @return java.lang.String
     * @author 军哥
     * @date 2023/10/14 21:28
     */
    @PostMapping(value = "/send")
    @ResponseBody
    public String send(String from, String to, String subject, String text) {
        try {
            //-- 创建邮件对象
            MimeMessage mimeMessage = javaMailSender.createMimeMessage();

            //-- 创建邮件帮助对象
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage);

            //-- 设置邮件内容
            mimeMessageHelper.setFrom(from);
            mimeMessageHelper.setText(to);
            mimeMessageHelper.setSubject(subject);
            mimeMessageHelper.setText(text);

            //-- 发送邮件
            javaMailSender.send(mimeMessage);

            return "OK";
        } catch (MessagingException e) {
            e.printStackTrace();
        } finally {
        }

        return "ERROR";
    }

    @PostMapping(value = "/sendExtra")
    @ResponseBody
    public String sendExtra(String from, String to, String subject, String text) {
        try {
            //-- 创建邮件对象
            MimeMessage mimeMessage = javaMailSender.createMimeMessage();

            //-- 创建邮件帮助对象
            MimeMessageHelper mimeMessageHelper = new MimeMessageHelper(mimeMessage, true);

            //-- 设置邮件内容
            mimeMessageHelper.setFrom(from);
            mimeMessageHelper.setText(to);
            mimeMessageHelper.setSubject(subject);
            mimeMessageHelper.setText(text);

            //-- 添加附件
            String filePath = "D:\\var\\images\\running.png";
            FileSystemResource fileSystemResource = new FileSystemResource(filePath);
            mimeMessageHelper.addAttachment(fileSystemResource.getFilename(), fileSystemResource.getFile());

            //-- 发送邮件
            javaMailSender.send(mimeMessage);

            return "OK";
        } catch (MessagingException e) {
            e.printStackTrace();
        } finally {
        }

        return "ERROR";
    }

}

4、测试接口

• 测试普通文本邮件

• 测试发送附件的邮件