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

# 發(fā)件人QQ號(hào)
spring.mail.username=2508575653@qq.com
# QQ郵箱授權(quán)碼
spring.mail.password=xxxxxxxxxxxxxxx
# 主機(jī)
spring.mail.host=smtp.qq.com
# qq郵箱需要開(kāi)啟安全連接
spring.mail.properties.mail.stmp.ssl.enable=true

package com.peng;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSenderImpl;
import org.springframework.mail.javamail.MimeMessageHelper;
import javax.mail.MessagingException;
import javax.mail.internet.MimeMessage;
import java.io.File;
@SpringBootTest
class SpringbootSecurityApplicationTests {
    @Autowired
    private JavaMailSenderImpl javaMailSender;
    @Test
    void contextLoads() {
        //簡(jiǎn)單郵件
        SimpleMailMessage message = new SimpleMailMessage();
        message.setSubject("測(cè)試");//主題
        message.setText("郵箱內(nèi)容");
      、//接受者郵箱（任何郵箱都可以）
        message.setTo("2508575653@qq.com");
      //發(fā)送者郵箱
        message.setFrom("2508575653@qq.com");
        javaMailSender.send(message);
    }
    @Test
    void test() throws MessagingException {
        //復(fù)雜郵件
        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        MimeMessageHelper helper = new MimeMessageHelper(mimeMessage,true);//組裝，開(kāi)啟之后可以添加附件
        helper.setSubject("ok");//主題
        helper.setText("內(nèi)容");
        helper.addAttachment("按什么名稱發(fā)送.后綴",new File("文件路徑"));
        helper.setTo("收件人");
        helper.setFrom("發(fā)件人");
        javaMailSender.send(mimeMessage);
    }
}