Springboot中发送邮件util

1.需要的依赖

<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.17</version>
</dependency>

2. Util

import org.apache.poi.util.IOUtils;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.core.io.ByteArrayResource;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;

import javax.mail.Session;
import javax.mail.internet.MimeMessage;
import java.io.InputStream;
import java.util.List;
import java.util.Map;
import java.util.Properties;

@Service
public class EmailUtil {

    @Value("${email.host}")
    private String host;
    @Value("${email.from}")
    private String from;
    @Value("${email.password}")
    private String password;

    /**
     * 发送邮件工具类
     *
     * @param tos
     * @param subject
     * @param emailContent
     * @param isHtml
     * @throws Exception
     */
    public void send(List<String> tos, String subject, String emailContent, boolean isHtml,
                     Map<String, InputStream> attachments) throws Exception {

        generalSend(host, password, from, tos, subject, emailContent, isHtml, attachments);
    }


    private void generalSend(String host, String password, String from, List<String> tos, String subject,
                            String emailContent, boolean isHtml,
                            Map<String, InputStream> attachments) throws Exception {
        JavaMailSenderImpl senderImpl = new JavaMailSenderImpl();
        //设定mail server
        senderImpl.setHost(host);

        //建立邮件消息,发送简单邮件和html邮件的区别
        MimeMessage mailMessage = senderImpl.createMimeMessage();
        MimeMessageHelper messageHelper = new MimeMessageHelper(mailMessage, 1, "UTF-8");
        //设置收件人，寄件人
        messageHelper.setTo(tos.toArray(new String[]{}));
        messageHelper.setFrom(from);
        messageHelper.setSubject(subject);
        //true 表示启动HTML格式的邮件
        messageHelper.setText(emailContent, isHtml);
        //添加文件文件
        if (attachments != null && attachments.size() > 0) {
            for (String fileName : attachments.keySet()) {
                InputStream in = attachments.get(fileName);
                ByteArrayResource bar = new ByteArrayResource(IOUtils.toByteArray(in));
                messageHelper.addAttachment(fileName, bar);
            }
        }
        //设置邮箱属性
        Properties prop = new Properties();
        // 将这个参数设为true，让服务器进行认证,认证用户名和密码是否正确
        prop.put("mail.smtp.auth", "true");
        prop.put("mail.smtp.starttls.enable", "true");
        prop.put("mail.smtp.host", host);
        prop.put("mail.smtp.user", from);
        prop.put("mail.smtp.pass", password);
        //配置发送类信息
        senderImpl.setJavaMailProperties(prop);
        senderImpl.setUsername(from);
        senderImpl.setPassword(password);
        senderImpl.setSession(Session.getDefaultInstance(senderImpl.getJavaMailProperties()));
        //发送邮件
        senderImpl.send(mailMessage);
    }
}