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

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    spring:
        mail:
            protocol: smtp #smtp是邮件发送协议，pop3和imap是邮件接收协议。因为我们要发送邮件，因此是smtp
            host: smtp.qq.com #邮件发送服务器的主机,这里采用qq邮箱服务器
            port: 587 #这个端口是必须设置的,看到好多教程,都没有设置它
            username: #qq邮箱,
            password: #qq授权码
            properties:
                mail:
                    smtp:
                        auth: true
                        starttls:
                            enable: true
                            required: true

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import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.mail.SimpleMailMessage;
import org.springframework.mail.javamail.JavaMailSender;
import org.springframework.test.context.junit4.SpringRunner;

import javax.annotation.Resource;

@RunWith(SpringRunner.class)
@SpringBootTest
public class BlogApplicationTests {
    @Resource
    private JavaMailSender javaMailSender;

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

	@Test
	public void contextLoads() {
        SimpleMailMessage message = new SimpleMailMessage();
        message.setFrom(sender);//发送者.
        message.setTo("[email protected]");//接收者.
        message.setSubject("测试邮件（邮件主题）");//邮件主题.
        message.setText("这是邮件内容");//邮件内容.
        javaMailSender.send(message);//发送邮件
	}

}