为什么@Autowired不起作用，返回空指针值

Question

这是我的代码。我做错了什么？我尝试使用@Autowired摆脱公共静态JavaMailSender emailSender = getJavaMailSender（）;

 @Component
    public class EmailServiceImpl{

        @Autowired
        public static JavaMailSender emailSender;


        @Bean
        public static JavaMailSender getJavaMailSender() {
            JavaMailSenderImpl mailSender = new JavaMailSenderImpl();

            mailSender.setPassword("password");

      /**/
        return mailSender;
    }
}

Answer 1

例如，在配置类中定义下面给出的代码：

@Configuration
public class config{
@Bean
        public static JavaMailSender getJavaMailSender() {
            JavaMailSenderImpl mailSender = new JavaMailSenderImpl();

            mailSender.setPassword("password");

      /**/
        return mailSender;
    }
}

然后在类EmailServiceImpl中应用依赖项注入，例如：

@Component
    public class EmailServiceImpl{

        @Autowired
        public static JavaMailSender emailSender;


        // remaining code
}