spring boot发简单文本邮件

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-mail</artifactId>
    <version>${spring-boot.version}</version>
    <scope>provided</scope>
</dependency>

spring.mail.host=smtp.qq.com
spring.mail.username=你的qq号码@qq.com
spring.mail.password=qq邮箱开启SMTP提供的授权码（注意：不是你的qq邮箱密码）
#下面一般不用动
spring.mail.default-encoding=${spring.http.encoding.charset}
spring.mail.properties.mail.smtp.connectiontimeout=5000 
spring.mail.properties.mail.smtp.timeout=3000
spring.mail.properties.mail.smtp.writetimeout=5000
spring.mail.properties.mail.smtp.auth=true
spring.mail.properties.mail.smtp.starttls.enable=true
spring.mail.properties.mail.smtp.starttls.required=true

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


SimpleMailMessage smm = new SimpleMailMessage();
                        smm.setFrom(from);
                        smm.setTo("发送方邮件地址");
                        smm.setSubject("springboot测试邮件");
                        smm.setText("简单文本邮件测试发送！");
                        mailSender.send(smm);