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)@SpringBootTestpublic 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，而后给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，本质就是读取内容而后 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);    }}