在SpringBoot中使用JavaMailSender

Question

使用的技术：

Spring Boot 1.4.2.Release，Spring 4.3.4.Release，Tymeleaf 2.1.5.Release，Tomcat Embeded 8.5.6、Maven 3、Java 8

我创建了这个服务来发送电子邮件

@Service
public class MailClient {

    protected static final Logger looger = LoggerFactory.getLogger(MailClient.class);

    @Autowired
    private JavaMailSender mailSender;

    private MailContentBuilder mailContentBuilder;

    @Autowired
    public MailClient(JavaMailSender mailSender, MailContentBuilder mailContentBuilder) {
        this.mailSender = mailSender;
        this.mailContentBuilder = mailContentBuilder;
    }

    //TODO: in a properties
    public void prepareAndSend(String recipient, String message) {
        MimeMessagePreparator messagePreparator = mimeMessage -> {
            MimeMessageHelper messageHelper = new MimeMessageHelper(mimeMessage);
            messageHelper.setFrom("[e-mail]");
            messageHelper.setTo(recipient);
            messageHelper.setSubject("Sample mail subject");
            String content = mailContentBuilder.build(message);
            messageHelper.setText(content, true);
        };
        try {
            if (looger.isDebugEnabled()) {
                looger.debug("sending email to " + recipient);
            }
            mailSender.send(messagePreparator);
        } catch (MailException e) {
            looger.error(e.getMessage());
        }
    }
}

***************************
APPLICATION FAILED TO START
***************************

Description:

Binding to target org.springframework.boot.autoconfigure.mail.MailProperties@1e94ed11 failed:

    Property: spring.mail.defaultEncoding
    Value: UTF-8 
    Reason: Failed to convert property value of type 'java.lang.String' to required type 'java.nio.charset.Charset' for property 'defaultEncoding'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [java.nio.charset.Charset]


Action:

Update your application's configuration

spring.mail.host=localhost
spring.mail.port=25 
spring.mail.username= 
spring.mail.password= 
spring.mail.protocol=smtp
spring.mail.defaultEncoding=UTF-8 

Answer 1

不能在与属性相同的行中有注释。Everycomment必须位于以“#”开头的行中,错误消息将显示

Value: 25 # SMTP server port

因此该值是字符串“25#SMTP服务器端口”,不能转换为整数。

将注释移动到属性上方自己的行中：

# SMTP server port
spring.mail.port=25