<!--傳送email依賴-->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-mail</artifactId>
        </dependency>

service

package com.ykmimi.job.service;

import org.springframework.stereotype.Service;

 
import java.util.Map;

@Service
public interface MailService {

    /**
     * TODO 傳送帶附件的郵件 , 需要進行過載方法
     */
    Map<String, Object> sendAttachmentsMail(String to, String subject, String content, String filePath);
}

service實現

package com.ykmimi.job.service.impl;

import com.ykmimi.job.service.MailService;
 
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.mail.javamail.MimeMessageHelper;
import org.springframework.stereotype.Service;
import org.springframework.util.ResourceUtils;

import javax.annotation.Resource;
 
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.HashMap;
import java.util.Map;

@Service
public class MailServiceImpl implements MailService {

    @Resource
    private JavaMailSender mailSender;
    //傳送者
    @Value("${mail.fromMail.addr}")
    private String from;

    //TODO 設定傳送郵件過載方式


    @Override
    public Map<String, Object> sendAttachmentsMail(String to, String subject, String content, String filePath) {

        System.out.println("in sendAttachmentsMail");
        System.out.println(filePath);
        MimeMessage message = mailSender.createMimeMessage();
        Map<String, Object> map = new HashMap<>();

        try {
            MimeMessageHelper helper = new MimeMessageHelper(message, true);
            helper.setFrom(from);
            helper.setTo(to);
            helper.setSubject(subject);
            helper.setText(content, true);
//            FileSystemResource file = new FileSystemResource(new File(filePath));
            // 傳送附件
            File file = new File(filePath);
            file = ResourceUtils.getFile(file.getAbsolutePath());
            String fileName = filePath.substring(filePath.lastIndexOf(File.separator));
//            String fileName = filePath.substring(filePath.lastIndexOf("/"));
//            String fileName = "附件";
            System.out.println(fileName);
            //新增多個附件可以使用多條 helper.addAttachment(fileName,file);
            //helper.addAttachment(fileName,file);
            helper.addAttachment(fileName, file);
            mailSender.send(message);
            map.put("code", 1);
            map.put("message", "傳送成功");
            return map;
        } catch (MessagingException e) {
            e.printStackTrace();
            map.put("code",0);
            map.put("message","傳送失敗");
            return map;
        } catch (FileNotFoundException e) {
            e.printStackTrace();
            map.put("code",-1);
            map.put("message","沒有檔案");
            return map;
        } finally {
        }


    }

}

或將郵件內容及郵件地址等封裝為EmailContent的bean實體

通過Controll而接受. 

下面是我的郵件主機配置,大家可以拿去用 

##上傳檔案限制大小
spring.servlet.multipart.max-file-size=10MB
spring.servlet.multipart.max-request-size=10MB
##傳送email設定
spring.application.name=spring-boot-mail
spring.mail.host=smtp.126.com
spring.mail.username[email protected].com
spring.mail.password=1314520jy
spring.mail.default-encoding=UTF-8
##郵件主機地址
mail.fromMail.addr[email protected].com



spring.mail.properties.mail.smtp.socketFactory.class=javax.net.ssl.SSLSocketFactory
#郵件埠
spring.mail.properties.mail.smtp.socketFactory.port=465

spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true