springboot 发送邮件+模板+附件

package com.example.demo;

import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.core.io.FileSystemResource;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.test.context.junit4.SpringRunner;
import org.thymeleaf.TemplateEngine;
import org.thymeleaf.context.Context;
import org.thymeleaf.context.IContext;

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

@RunWith(SpringRunner.class)
@SpringBootTest
public class SendMailWithTemplate {
    @Autowired
    JavaMailSender javaMailSender;

    @Autowired
    TemplateEngine templateEngine;

    @Test
    public void sendMailWithTempalte() throws MessagingException {
        MimeMessage mailMessage = javaMailSender.createMimeMessage();
        //开启带附件true
        MimeMessageHelper messageHelper = new MimeMessageHelper(mailMessage, true);
        // 声明一个上下文对象，里面放入要存到模板里面的数据
        IContext context = new Context();
        //获取模板html代码
        ((Context) context).setVariable("username", "alex");
        // 指定相应的模板，然后给context数据传过去
        String process = templateEngine.process("index", context);

        try {
            messageHelper.setFrom("wangzhilei@jd.com");
            messageHelper.setTo("wangzhilei@jd.com");
            // 抄送
//            String[] mails= new String[]{};
//            messageHelper.setCc(mails);
            // 密送 
//            messageHelper.setBcc();
            messageHelper.setSubject("tempalte 模板邮件");
            // 设置处理好的结果，本质就是读取内容然后 后面一个参数html:true必须为true,保证正常的读取hml

            messageHelper.setText(process, true);
            // 发送模板的时候，同时带附件过去
            FileSystemResource fileSystemResource = new FileSystemResource("src/main/resources/static/images/a.jpg");
            messageHelper.addAttachment("b.jpg", fileSystemResource);
        } catch (MessagingException e) {
            e.printStackTrace();
        }

        javaMailSender.send(mailMessage);
    }
}