添加依赖

<dependency>
    <groupId>com.sun.mail</groupId>
    <artifactId>javax.mail</artifactId>
    <version>1.6.2</version>
</dependency>

配置邮箱

实现代码

package com.example.demo.service;
import org.springframework.stereotype.Service;

import java.util.Properties;
import java.util.Random;
import javax.mail.*;
import javax.mail.internet.*;

@Service
public class QQEmailSender {

    public  void qq(String qq) {
        // 发件人邮箱地址和授权码
        String from ="your_email@qq.com";
        String password = "your_authorization_code";
        // 收件人电子邮箱
        String to = qq;

        // 指定发送邮件的主机为 smtp.qq.com
        String host = "smtp.qq.com";  //QQ 邮件服务器

        // 获取系统属性
        Properties properties = System.getProperties();

        // 设置邮件服务器
        properties.setProperty("mail.smtp.host", host);

        properties.put("mail.smtp.auth", "true");

        // 获取默认的 Session 对象。
        // 获取默认session对象
        Session session = Session.getDefaultInstance(properties,new Authenticator(){
            public PasswordAuthentication getPasswordAuthentication()
            {
                return new PasswordAuthentication(from, password); //发件人邮件用户名、授权码
            }
        });

        // 设置debug模式便于调试:
        session.setDebug(true);

        try{
            // 创建默认的 MimeMessage 对象。
            MimeMessage message = new MimeMessage(session);

            // Set From: 头部头字段
            message.setFrom(new InternetAddress(from));

            // Set To: 头部头字段
            message.addRecipient(Message.RecipientType.TO,
                    new InternetAddress(to));

            // Set Subject: 头字段
            message.setSubject("大可","UTF-8");

            // 发送 HTML 消息, 可以插入html标签

            String generatedCode = random1();   // 假设后台生成的验证码
            String emailBody = vericodeHtml.replace(":data=\"123456\"", ":data=\"" + generatedCode + "\"").replace("1EM456", generatedCode); //将发送页面的验证码改为后台生成的验证码

            message.setText(emailBody, "UTF-8", "html");

            // 发送消息
            Transport.send(message);
            System.out.println("Sent message successfully....");
        }catch (MessagingException mex) {
            mex.printStackTrace();
        }

    }
    //生成6位数  验证码
    public static String random1() {
        String code = "";
        Random rd = new Random();
        for (int i = 0; i < 6; i++) {
            int r = rd.nextInt(10); //每次随机出一个数字（0-9）
            code = code + r;  //把每次随机出的数字拼在一起
        }
        System.out.println(code);
        return code;
    }

    public static String vericodeHtml = "<!DOCTYPE html>\n" +
            "<html lang=\"en\">\n" +
            "<head>\n" +
            "    <meta charset=\"UTF-8\">\n" +
            "    <title>邮箱验证码</title>\n" +
            "    <style>\n" +
            "\n" +
            "        .main {\n" +
            "            margin: 10px auto;\n" +
            "            width: 520px;\n" +
            "\n" +
            "            border-top: 4px solid #9373EE;\n" +
            "            padding: 24px 24px 40px;\n" +
            "            border-radius:0 0 8px 8px;\n" +
            "            box-shadow: 0px 0px 1px;\n" +
            "        }\n" +
            "\n" +
            "        .title {\n" +
            "            margin: 80px auto 32px;\n" +
            "            font-size: 32px;\n" +
            "            font-weight: 600;\n" +
            "            line-height: 45px;\n" +
            "            letter-spacing: 0px;\n" +
            "\n" +
            "        }\n" +
            "\n" +
            "        .note {\n" +
            "            margin: 0 auto;\n" +
            "            font-size: 18px;\n" +
            "            line-height: 1.4;\n" +
            "            left: 0px;\n" +
            "            top: 77px;\n" +
            "            font-weight: 400;\n" +
            "        }\n" +
            "\n" +
            "        .code {\n" +
            "            padding: 16px;\n" +
            "            text-align: center;\n" +
            "            background: rgba(147, 115, 238, 0.04);\n" +
            "            border-radius: 4px;\n" +
            "            font-weight: 600;\n" +
            "            font-size: 24px;\n" +
            "            line-height: 140%;\n" +
            "            color: #9373EE;\n" +
            "            margin: 24px 0;\n" +
            "            letter-spacing: 1px;\n" +
            "        }\n" +
            "\n" +
            "        .claim ul {\n" +
            "            margin-top: 34px;\n" +
            "            margin-bottom: 40px;\n" +
            "            font-size: 13px;\n" +
            "            line-height: 1.6;\n" +
            "            color: #5c5c5c;\n" +
            "            padding: 25px 0;\n" +
            "\n" +
            "        }\n" +
            "\n" +
            "        .claim ul li {\n" +
            "            color: rgba(24, 24, 25, 0.42);\n" +
            "            line-height: 30px;\n" +
            "        }\n" +
            "\n" +
            "        .footer {\n" +
            "            font-size: 13px;\n" +
            "            line-height: 1.6;\n" +
            "            color: #5c5c5c;\n" +
            "            padding: 25px 0\n" +
            "        }\n" +
            "        .title,.note,.claim,.footer {\n" +
            "            text-align: center;\n" +
            "        }\n" +
            "    </style>\n" +
            "</head>\n" +
            "<body>\n" +
            "<div class=\"main\">\n" +
            "    <div class=\"title\">邮箱账号验证码</div>\n" +
            "    <div class=\"note\">你正在进行邮箱验证操作，验证码为:</div>\n" +
            "    <div class=\"code\" :data=\"123456\">1EM456</div>\n" +
            "\n" +
            "    <div class=\"claim\">\n" +
            "        <ul style=\"list-style: none;\">\n" +
            "            <li style=\"list-style: none;\">此验证码 15 分钟内有效</li>\n" +
            "            <li style=\"list-style: none;\">如非本人操作</li>\n" +
            "            <li style=\"list-style: none;\">转给他人将导致账号被盗和个人信息泄漏，谨防诈骗</li>\n" +
            "        </ul>\n" +
            "    </div>\n" +
            "\n" +
            "    <div class=\"footer\">\n" +
            "        <a href=\"\" target=\"_blank\" style=\"color: #9373EE; text-decoration: none;\"></a>\n" +
            "    </div>\n" +
            "</div>\n" +
            "</body>\n" +
            "</html>";
}

# java # 开发语言
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