2019-12-19 spring中 注解使用变量实现动态配置

在注解中使用变量 会遇到问题
因为注解中的变量 不能是@Value 注解的 好像是final什么的 记不清了
如
@KafkaListener(topics ="A",groupId = "topicGroupId")
@Scheduled(fixedRate = PaymentConstants.safeRate)

这个时候 可以将变量注入spring容器 然后注解中通过表达式取得值
如 将kafka的listener注解进行变量处理

@Data
@ConfigurationProperties("spring.kafka.topic")
public class KafkaTopicProperties implements Serializable {
    private String groupId;
    private String exchangeRateCallbackTopicName;
    private String paymentClearCallbackTopicName;
    private String paymentCheckConfirmsCallbackTopicName;
}

@Configuration
@EnableConfigurationProperties(KafkaTopicProperties.class)
public class KafkaTopicConfiguration {

    private final KafkaTopicProperties properties;

    public KafkaTopicConfiguration(KafkaTopicProperties properties) {
        this.properties = properties;
    }

    @Bean
    public String exchangeRateCallbackTopicName(){
        return properties.getExchangeRateCallbackTopicName();
    }

    @Bean
    public String paymentClearCallbackTopicName(){
        return properties.getPaymentClearCallbackTopicName();
    }

    @Bean
    public String paymentCheckConfirmsCallbackTopicName(){
        return properties.getPaymentCheckConfirmsCallbackTopicName();
    }

    @Bean
    public String topicGroupId() {
        return properties.getGroupId();
    }
}

@KafkaListener(topics = "#{exchangeRateCallbackTopicName}",groupId = "#{topicGroupId}")
    public void exechangeRateListen(ConsumerRecord record) {
        Optional kafkaMessage = Optional.ofNullable(record.value());
        if (kafkaMessage.isPresent()) {
            String message = kafkaMessage.get();
            log.info("kafka exchange rate result ->:{}",message);
            if (StringUtil.isNotEmpty(message)){
                LockRateInfo response = JSONObject.parseObject(message, LockRateInfo.class);
                if (StringUtil.isNotEmpty(response)){
                    updateExchangeRateStatus(response);
                }
            }
        }
    }