Question

我是Spring的新手，所以我有这样的问题：说明：

com.diet4you.LapkoEkaterina.MailComponent中的字段templateEngine需要一个类型为'org.thymeleaf.TemplateEngine'的bean。

注入点具有以下注释： -@ org.springframework.beans.factory.annotation.Autowired（required = true）

找到了以下候选者，但无法注入： -未加载“ ThymeleafAutoConfiguration.ThymeleafDefaultConfiguration”中的Bean方法“ templateEngine”，因为@ConditionalOnBean（类型：org.thymeleaf.spring5.ISpringTemplateEngine； SearchStrategy：全部）发现类型为“ org.thymeleaf.spring5.ISpringTemplateEngine”的bean -由于未找到反应式Web应用程序类，因此未加载'ThymeleafAutoConfiguration.ThymeleafReactiveConfiguration'中的Bean方法'templateEngine'

动作：

考虑重新访问上述条目或在您的配置中定义类型为“ org.thymeleaf.TemplateEngine”的bean。

MailComponent：

@Component
public class MailComponent {
    @Autowired
    MailSender mailSender;

    @Autowired
    JavaMailSender javaMailSender;

    @Autowired
    TemplateEngine templateEngine;

    public boolean sendSimpleMail(Contact contact) {
        SimpleMailMessage mailMessage = new SimpleMailMessage();
        mailMessage.setFrom(contact.getEmail());
        mailMessage.setSubject(contact.getSubject());
        mailMessage.setText(contact.getMessage());
        mailMessage.setTo("email@email.com"); // if you use Gmail do not forget to put your personal address

        try {
            mailSender.send(mailMessage);
            return true;
        } catch (MailException e) {
            System.err.println(e.getMessage());
            return false;
        }
    }

    public boolean sendHtmlMail(Contact contact) {

        Context context = new Context();
        context.setVariable("contact", contact);
        final String messageHtml = templateEngine.process("email/contact", context);

        MimeMessage mimeMessage = javaMailSender.createMimeMessage();
        MimeMessageHelper mailMessage = new MimeMessageHelper(mimeMessage);
        try {
            mailMessage.setTo("email@email.com"); // if you use Gmail do not forget to put your personal address
            mailMessage.setFrom(contact.getEmail());
            mailMessage.setSubject(contact.getSubject());
            mailMessage.setText(messageHtml, true);
            javaMailSender.send(mimeMessage);
            return true;
        } catch (MessagingException | MailException e) {
            System.err.println(e.getMessage());
            return false;
        }
    }
}

MailConfig：

@PropertySource(ignoreResourceNotFound = true, value = "classpath:ValidationMessages.properties")
@Configuration
public class MailConfig {

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

    @Value("${spring.mail.port}")
    private int port;

    @Value("${spring.mail.default-encoding}")
    private String encoding;

    @Value("${spring.mail.properties.mail.debug}")
    private String debug;

    /**
     * Gmail Config
     */
//    @Value("${spring.mail.username}")
//    private String username;
//    @Value("${spring.mail.password}")
//    private String password;
//    @Value("${spring.mail.properties.mail.smtp.auth}")
//    private String auth;
//    @Value("${spring.mail.properties.mail.smtp.starttls.enable}")
//    private String starttls;

    @Bean
    public JavaMailSender javaMailSender() {
        JavaMailSenderImpl mailSender = new JavaMailSenderImpl();
        mailSender.setDefaultEncoding(encoding);
        mailSender.setHost(host);
        mailSender.setPort(port);

        /**
         * Gmail Config
         */
//        mailSender.setUsername(username);
//        mailSender.setPassword(password);
        Properties properties = new Properties();
//        properties.put("mail.smtp.auth", auth);
//        properties.put("mail.smtp.starttls.enable", starttls);
        properties.put("mail.debug", debug);
        mailSender.setJavaMailProperties(properties);

        return mailSender;
    }





}

ThymeleafConfig：

public class ThymeleafConfig extends WebMvcConfigurerAdapter  {




    @Bean
    public ViewResolver viewResolver() {
        ThymeleafViewResolver viewResolver = new ThymeleafViewResolver();
        viewResolver.setCharacterEncoding("UTF-8");
        viewResolver.setTemplateEngine( templateEngine());
        return viewResolver;
    }

    @Bean
    public ISpringTemplateEngine templateEngine() {
        SpringTemplateEngine templateEngine = new SpringTemplateEngine();
        templateEngine.setTemplateResolver(templateResolver());
        return templateEngine;
    }

    private ITemplateResolver templateResolver() {
        SpringResourceTemplateResolver templateResolver = new SpringResourceTemplateResolver();
        templateResolver.setCharacterEncoding("UTF-8");
        templateResolver.setCacheable(false);
        templateResolver.setPrefix("classpath:/templates/");
        templateResolver.setSuffix(".html");
        templateResolver.setTemplateMode(TemplateMode.HTML);
        return templateResolver;
    }
}

我是通过以下示例完成此操作的：https://www.youtube.com/watch?v=KoPWOACk6CA

Answer 1

Spring在尝试构造KonsultacjaController时会抱怨，因为它找不到满足MailComponent依赖关系的bean。从您所包括的类中，看来这可能是两件事之一：

您的spring上下文没有TemplateEngine实例。您的MailComponent需要一个，如果您的上下文没有它，它将无法构造MailController（因此将不能构造KonsultacjaController）。

或

Spring组件扫描找不到您的MailController组件，因此它在上下文中不存在。

顺便说一下，JavaMailSender扩展了MailSender，因此您无需将两者都注入MailComponent。

Answer 2

如@Chris所建议。

浏览 application.properties 或 application.yml 文件。

必须定义键，如下例所示

application.properties

spring.mail.default-encoding=UTF-8

application.yml

spring
  mail
    default-encodig: UTF-8

MailComponent中的字段templateEngine需要找不到类型为'org.thymeleaf.TemplateEngine'的bean

2 个答案: