1. 所需依赖

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

其他需要的Spring依赖可以自行添加

2. 代码

import lombok.RequiredArgsConstructor;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

@Service
public class EmailServiceSmtpImpl {

	@Autowired
    private JavaMailSender emailMailSender;
    
    public void send() {
        SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
        simpleMailMessage.setFrom(你的邮箱,发送方邮箱,qq邮箱或者网易邮箱);
        simpleMailMessage.setTo(接收方的邮箱); 
        simpleMailMessage.setSubject(邮件的主题(邮件的名称));
        simpleMailMessage.setText(发送的内容);
        emailMailSender.send(simpleMailMessage);
    }
}

3. qq邮箱配置

在application.properties文件中添加如下配置

# 服务器的主机, 是固定的
spring.mail.host=smtp.qq.com
# 授权码, 下面说如何获取
spring.mail.password=xxxx
# 配置
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
# 放送方的qq邮箱
spring.mail.username=

获取授权码

鼠标滚轮向下滑动, 找到POP3/IMAP/SMTP/Exchange/CardDAV/CalDAV服务

我这里需要一些验证

获得授权码

授权码要牢记, 如果忘了, 关了再重新开启一次

4. 网易邮箱配置

在application.properties文件中添加如下配置

# 服务器的主机, 是固定的
spring.mail.host=smtp.163.com
# 授权码, 下面说如何获取
spring.mail.password=xxxx
# 配置
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
# 放送方的网易邮箱
spring.mail.username=

获取授权码

开启后获取授权码, 我的已经开启啦

5. 测试类

可能要引入一些依赖, 大家自行引入

注意, 没有配置properties文件直接运行会报错

import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.annotation.DirtiesContext;
import org.springframework.test.context.ActiveProfiles;

@ActiveProfiles("test")
@DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_CLASS)
@SpringBootTest(webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT)
public class BaseIntegrationTest {

}

import main.service.validation.EmailServiceSmtpImpl;
import main.service.validation.SmsServiceTencentSmsImpl;
import org.junit.jupiter.api.Test;
import org.junit.jupiter.api.extension.ExtendWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.test.context.junit.jupiter.SpringExtension;

@ExtendWith(SpringExtension.class)
public class SmtpSendMailUnitTests extends BaseIntegrationTest {

    @Autowired
    private EmailServiceSmtpImpl emailServiceSmtpImpl;

    @Test
    public void sendSmsWangYi_thenAcceptSuccessfully () {
        emailServiceSmtpImpl.send(你的qq邮箱, 发送的信息);
    }

}

发送Email服务

import lombok.RequiredArgsConstructor;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.stereotype.Service;

@Service
@RequiredArgsConstructor
public class EmailServiceSmtpImpl implements EmailService {

    private final JavaMailSender emailMailSender;

    public void send(String email, String message) {
        SimpleMailMessage simpleMailMessage = new SimpleMailMessage();
        simpleMailMessage.setFrom("xxx@163.com");
        simpleMailMessage.setTo(email);
        simpleMailMessage.setSubject("Spring Security 登录验证码");
        simpleMailMessage.setText("验证码为:" + message);
        emailMailSender.send(simpleMailMessage);
    }
}