spring boot 邮件发送

1. 之前的发邮件的话比较繁琐，spring bbot帮我们简化了开发，引入mail的启动类支持

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

2. 既然spring boot中已经配置了，说明它里面肯定有一个关于mail的自动配置类：MailSenderAutoConfiguration

   @Configuration(
       proxyBeanMethods = false
   )
   @ConditionalOnClass({MimeMessage.class, MimeType.class, MailSender.class})
   @ConditionalOnMissingBean({MailSender.class})
   @Conditional({MailSenderAutoConfiguration.MailSenderCondition.class})
   @EnableConfigurationProperties({MailProperties.class})
   @Import({MailSenderJndiConfiguration.class, MailSenderPropertiesConfiguration.class})
   public class MailSenderAutoConfiguration {
       public MailSenderAutoConfiguration() {
       }
   
       static class MailSenderCondition extends AnyNestedCondition {
           MailSenderCondition() {
               super(ConfigurationPhase.PARSE_CONFIGURATION);
           }
   
           @ConditionalOnProperty(
               prefix = "spring.mail",
               name = {"jndi-name"}
           )
           static class JndiNameProperty {
               JndiNameProperty() {
               }
           }
   
           @ConditionalOnProperty(
               prefix = "spring.mail",
               name = {"host"}
           )
           static class HostProperty {
               HostProperty() {
               }
           }
       }
   }
   

3. 同样可以查看配置文件，可以看我们能配置什么内容：MailProperties

   public class MailProperties {
       private static final Charset DEFAULT_CHARSET;
       private String host;
       private Integer port;
       private String username;
       private String password;
       private String protocol = "smtp";
       private Charset defaultEncoding;
       private final Map<String, String> properties;
       private String jndiName;
   

4. 配置自己与mail相关的配置

   spring.mail.username=1151143042@qq.com
   spring.mail.password=qq邮箱授权码
   spring.mail.host=smtp.qq.com
   # qq需要配置ssl
   spring.mail.properties.mail.smtp.ssl.enable=true
   

5. 进行代码测试

   
   @Autowired
   JavaMailSenderImpl mailSender;
   
   @Test
   public void emailTest(){
       //邮件设置1：一个简单的邮件
       SimpleMailMessage message = new SimpleMailMessage();
       message.setSubject("邮件主题");
       message.setText("邮件正文");
   
       message.setTo("fageishui@qq.com");
       message.setFrom("shuifade@qq.com");
       mailSender.send(message);
   }
   

6. 若带有附件的复杂的邮件发送

　　@Autowired
JavaMailSenderImpl mailSender;

@Test
public void contextLoads2() throws MessagingException {
    //邮件设置2：一个复杂的邮件
    MimeMessage mimeMessage = mailSender.createMimeMessage();
    MimeMessageHelper helper = new MimeMessageHelper(mimeMessage, true);

    helper.setSubject("邮件的主题");
    helper.setText("<b style='color:red'>邮件的正文，写一些格式</b>",true);

    //发送附件
    helper.addAttachment("1.jpg",new File("F：/1.jpg"));

    helper.setTo("fageishui@qq.com");
    helper.setFrom("shuifade@qq.com");

    mailSender.send(mimeMessage);
}
```