Java Webhook-迁移到v2-无法将queryResult设置为java.util.LinkedHashMap

Question

我正在将dialogflow v1和spring boot java用作webhook，使用：http ://mvnrepository.org/artifact/ai.api/libai/1.6.12

现在，我尝试使用以下方法升级到dialogflow v2：http ://mvnrepository.org/artifact/com.google.apis/google-api-services-dialogflow/v2-rev2-1.23.0

<dependency>
    <groupId>com.google.apis</groupId>
    <artifactId>google-api-services-dialogflow</artifactId>
    <version>v2-rev2-1.23.0</version>
</dependency>

目的：这样我就不必自己解析/构建json了，我已经在mvnrepository搜索中找到了它

我截获了这个json：

{
    "responseId": "72945ef4-0897-4705-a770-a12100162b45",
    "queryResult": {
        "queryText": "was gibts neues?",
        "action": "GetNewsFromWordpress",
        "parameters": {
            "allRequiredParamsPresent": true
        },
        "name": "projects/kreamont-abf6b/agent/intents/fe2c13a1-2e3f-48eb-a15a-660501c16807",
        "diagnosticInfo": {

        }
    },
    "languageCode": {
        "intentDetectionConfidence": 1.0
    },
    "displayName": {
        "payload": {

        }
    },
    "session": "projects/kreamont-abf6b/agent/sessions/e69aabe7-4f6a-4224-b881-8bbf31835ef2"
}           

杰克逊无法以某种方式绑定模型。我如何使用一些Java库，这样我就不必自己解析json了？

com.fasterxml.jackson.databind.JsonMappingException：无法将com.google.api.services.dialogflow.v2.model.GoogleCloudDialogDialogV2QueryResult字段com.google.api.services.dialogflow.v2.model.GoogleCloudDialogflowV2WebhookRequest.queryResult设置为java.util .LinkedHashMap（通过参考链：com.google.api.services.dialogflow.v2.model.GoogleCloudDialogflowV2WebhookRequest [“ queryResult”]）

@RequestMapping(method = RequestMethod.POST, path = "fulfillment", consumes = MediaType.APPLICATION_JSON_VALUE)
public GoogleCloudDialogflowV2WebhookResponse getFulfillment(@RequestBody GoogleCloudDialogflowV2WebhookRequest request) {
    // HttpMessageNotReadableException 
    ...

Answer 1

该库取决于 google-api-client。它有一个用于传输对象的自定义 json 解析器（如 GoogleCloudDialogflowV2WebhookRequest）。这些对象从地图延伸出来。它们的元素都标有 Key 注释。这就是普通的 jackson 或 gson 解析器失败的原因。您有多种选择：

1. 复制并修改传输对象（如果将来 API 发生变化则不好）
2. 为spring编写一个使用google api json解析器的httpmessageconverter（不知道这会花费多少精力）

3. 禁用端点的 spring 消息转换器并自行进行编组，如下所示：

   import com.google.api.client.json.JsonGenerator;
   import com.google.api.client.json.jackson2.JacksonFactory;
   import com.google.api.services.dialogflow.v2.model.*;
   import org.springframework.web.bind.annotation.PostMapping;
   import org.springframework.web.bind.annotation.RequestBody;
   import org.springframework.web.bind.annotation.RestController;
   import reactor.core.publisher.Mono;
   
   import java.io.IOException;
   import java.io.StringWriter;
   import java.util.Collections;
   
   @RestController
   public class DialogflowWebhookController {
   
   private static JacksonFactory jacksonFactory = JacksonFactory.getDefaultInstance();
   
   @PostMapping("/dialogflow")
   public Mono<String> webhook(@RequestBody String rawRequest) throws IOException {
   
       GoogleCloudDialogflowV2WebhookRequest request = jacksonFactory.createJsonParser(rawRequest)
           .parse(GoogleCloudDialogflowV2WebhookRequest.class);
   
       StringWriter stringWriter = new StringWriter();
       JsonGenerator jsonGenerator = jacksonFactory.createJsonGenerator(stringWriter);
       GoogleCloudDialogflowV2WebhookResponse response = ...
       jsonGenerator.serialize(response);
       jsonGenerator.flush();
       return Mono.just(stringWriter.toString());
   }
   }