建项目

1. 创建一个SpringBoot项目

改pom，导入相关依赖

org.springframework.boot
spring-boot-starter-parent
2.2.2.RELEASE

<dependencies>
    <!--web依赖-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <!--邮件发送依赖-->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-mail</artifactId>
    </dependency>
    <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

写Yml，配置application.yml

server:
port: 端口号

spring:
mail:
#邮件发送配置
default-encoding: UTF-8
host: smtp.qq.com
# 授权码
password: 你的授权码
# 邮件发送安全配置
properties:
mail:
smtp:
auth: true
starttls:
enable: true
required: true
# 发件人信息
username: 发件人邮箱

主启动类EmailSignupApplication

/**

• @author QiuQiu&LL
• @create 2021-08-09 2:18
• @Description:
  */
  @SpringBootApplication
  @ComponentScan("com.qbb")
  public class EmailSignupApplication {
  public static void main(String[] args) {
  SpringApplication.run(EmailSignupApplication.class, args);
  }
  }

业务

1. 创建Service

/**

• @author QiuQiu&LL
• @create 2021-08-09 2:18
• @Description:
  /
  public interface MailService {
  /*
  • 发送邮件
  • @param to 邮件收件人
  • @param subject 邮件主题
  • @param verifyCode 邮件验证码
    */
    public void sendVertifyCode(String to, String subject, String verifyCode);
    }

2. 实现类ServiceImpl

package com.qbb.email_signup.service.impl;

import com.qbb.email_signup.service.MailService;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

/**

• @author QiuQiu&LL

• @create 2021-08-09 2:20

• @Description:
  */
  @Service
  public class MailServiceImpl implements MailService {

  @Value("${spring.mail.username}")
  private String from;

  @Autowired
  private JavaMailSender mailSender;

  Logger logger = LoggerFactory.getLogger(this.getClass());

  /**

  • 发送邮件
  • @param to 邮件收件人
  • @param subject 邮件主题
  • @param verifyCode 邮件验证码
    */
    @Override
    public void sendVertifyCode(String to, String subject, String verifyCode) {
    SimpleMailMessage message = new SimpleMailMessage();
    message.setFrom(from); //发送人
    message.setTo(to); //收件人
    message.setSubject(subject); //邮件名
    message.setText(verifyCode); //邮件内容（验证码）
    mailSender.send(message);
    logger.info("已经发送");
    }
    }

测试

package com.qbb.email_signup;

import com.qbb.email_signup.service.MailService;
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.test.context.junit4.SpringRunner;

/**

• @author QiuQiu&LL

• @create 2021-08-09 2:28

• @Description:
  */
  @RunWith(SpringRunner.class)
  @SpringBootTest(classes = EmailSignupApplication.class)
  public class MailServiceTest {

  @Autowired
  private MailService mailService;

  @Test
  public void Test1() {
  /填你的测试信息/
  String to = "收件人邮箱";
  String title = "测试邮件";
  String context = "测试验证码";
  mailService.sendVertifyCode(to, title, context);
  }

}

结果