1.在SpringBoot项目中的pom.xml文件下引入邮件依赖包

<!--发邮件-->
<dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-mail</artifactId>
</dependency>

2.在SpringBoot项目中创建邮件处理工具类

package com.online_post.utils;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;

@Service
public class MailUtils {
    

    private final Logger logger = LoggerFactory.getLogger(this.getClass());

    @Value("${spring.mail.username}")
    private String from;

    @Autowired
    private JavaMailSender mailSender;

    /**
     * 简单文本邮件
     * @param to 接收者邮件
     * @param subject 邮件主题
     * @param contnet 邮件内容
     */
    public void sendSimpleMail(String to, String subject, String contnet){
    

        SimpleMailMessage message = new SimpleMailMessage();
        message.setTo(to);
        message.setSubject(subject);
        message.setText(contnet);
        message.setFrom(from);

        mailSender.send(message);
    }

    /**
     * HTML 文本邮件
     * @param to 接收者邮件
     * @param subject 邮件主题
     * @param contnet HTML内容
     * @throws MessagingException
     */
    public void sendHtmlMail(String to, String subject, String contnet) throws MessagingException {
    
        MimeMessage message = mailSender.createMimeMessage();

        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(contnet, true);
        helper.setFrom(from);

        mailSender.send(message);
    }

    /**
     * 附件邮件
     * @param to 接收者邮件
     * @param subject 邮件主题
     * @param contnet HTML内容
     * @param filePath 附件路径
     * @throws MessagingException
     */
    public void sendAttachmentsMail(String to, String subject, String contnet,
                                    String filePath) throws MessagingException {
    
        MimeMessage message = mailSender.createMimeMessage();

        MimeMessageHelper helper = new MimeMessageHelper(message, true);
        helper.setTo(to);
        helper.setSubject(subject);
        helper.setText(contnet, true);
        helper.setFrom(from);

        FileSystemResource file = new FileSystemResource(new File(filePath));
        String fileName = file.getFilename();
        helper.addAttachment(fileName, file);

        mailSender.send(message);
    }

    /**
     * 图片邮件
     * @param to 接收者邮件
     * @param subject 邮件主题
     * @param contnet HTML内容
     * @param rscPath 图片路径
     * @param rscId 图片ID
     * @throws MessagingException
     */
    public void sendInlinkResourceMail(String to, String subject, String contnet,
                                       String rscPath, String rscId) {
    
        logger.info("发送静态邮件开始: {},{},{},{},{}", to, subject, contnet, rscPath, rscId);

        MimeMessage message = mailSender.createMimeMessage();
        MimeMessageHelper helper = null;

        try {
    

            helper = new MimeMessageHelper(message, true);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(contnet, true);
            helper.setFrom(from);

            FileSystemResource res = new FileSystemResource(new File(rscPath));
            helper.addInline(rscId, res);
            mailSender.send(message);
            logger.info("发送静态邮件成功!");

        } catch (MessagingException e) {
    
            logger.info("发送静态邮件失败: ", e);
        }

    }

}

3.在SpringBoot项目下的application.properties中修改配置文件

#邮箱服务器地址，各大运营商不同(此处发送方邮箱以QQ为例)
spring.mail.host=smtp.qq.com
#用户名
spring.mail.username=xxx@qq.com #该qq邮箱是发送方的邮箱
#密码，如果是qq的，要申请临时授权码
spring.mail.password=xxx
spring.mail.default-encoding=UTF-8
#以谁来发送邮件
mail.fromMail.addr=xxx1@qq.com
#加下面这两个配置才能通过qq给qq及其他邮箱(如163等)发邮件
spring.mail.protocol=smtp
spring.mail.properties.mail.smtp.ssl.enable=true

4.申请QQ临时授权码

4.1登录QQ邮箱

4.2点击设置

4.3点击账户并且生成授权码

按照操作获取授权码之后将该授权码粘贴到application.properties中的

#密码，如果是qq的，要申请临时授权码
spring.mail.password=你的授权码

4.4测试一下邮件工具类

此步骤省略，可随意在任何测试类中测试

5. 联系作者

QQ: 2805005861