java - HttpRequestHandlingMessagingGateway JSON 数组有效负载

Question

我无法使用 HTTP 入站适配器将 JSON 数组转换为 SendgridTxEvent 类型的对象列表，它总是以 ArrayList<LinkedHashMap> 结尾而不是List<SendgridTxEvent> 。配置:

public HttpRequestHandlingMessagingGateway sendgridMessageAdapter(@Qualifier("sendgridWebhookEvents") MessageChannel channel) {
        HttpRequestHandlingMessagingGateway httpInboundChannelAdapter = new HttpRequestHandlingMessagingGateway(false);

        RequestMapping mapping = new RequestMapping();
        mapping.setMethods(HttpMethod.POST);
        mapping.setPathPatterns("/webhook/sendgrid");

        ParameterizedTypeReference<List<SendgridTxEvent>> ptr = new ParameterizedTypeReference<List<SendgridTxEvent>>() {
        };

        httpInboundChannelAdapter.setRequestMapping(mapping);
        httpInboundChannelAdapter.setRequestChannel(channel);
        httpInboundChannelAdapter.setRequestPayloadType(ResolvableType.forType(ptr));

        return httpInboundChannelAdapter;
    }

如果我将请求负载类型设置为 httpInboundChannelAdapter.setRequestPayloadType(ResolvableType.forType(SendgridTxEvent.class))并向其提供 JSON 对象(而不是数组)，jackson 反序列化 SendgridTxEvent正确，因此问题仅发生在数组输入时。输入示例可参见 here .

如何在 HTTP 入站适配器中使用 JSON 数组？

SendgridTxEvent类:

@JsonIgnoreProperties(ignoreUnknown = true)
public class SendgridTxEvent {
    public enum Event {
        PROCESSED,
        DROPPED,
        DELIVERED,
        BOUNCE,
        DEFERRED,
        OPEN,
        CLICK,
        UNSUBSCRIBE,
        SPAMREPORT;

        @JsonCreator
        public static Event forValue(String value) {
            return Event.valueOf(value.toUpperCase());
        }
    }

    private String email;
    private Long timestamp;
    private Event event;

    @JsonFormat(with = JsonFormat.Feature.ACCEPT_SINGLE_VALUE_AS_ARRAY)
    private List<String> category;
    private String sgEventId;
    private String sgMessageId;

//getters, setters

}

Answer 1

我提出了一个问题来在框架中解决此问题:https://github.com/spring-projects/spring-integration/issues/2806

同时，作为一种解决方法，我建议在 HttpRequestHandlingMessagingGateway 中期待有效负载如String或byte[] ，然后使用 POJO @Transformer下游通过ObjectMapper直接转换已经符合您的预期 <List<SendgridTxEvent>类型。

另一个简单的选项，您可以期待 SendgridTxEvent[].class然后将其转换为下游列表。