Question

GraphQL的新手......

将GraphQL查询发送到由第三方控制的外部服务器。

使用此GraphQL查询：

query Photos($first: Int!, $propertyId: String) {
  viewer {
    content {
      contentLists(first: $first, property_id: $propertyId, contentListType: IMAGE, publishState: PUBLISHED, orderBy: originalPublishDate, orderByDirection: DESC) {
        edges {
          node {
            id
            title
            caption
            originalPublishDate
            lastModifiedDate
            contents(first: $first) {
              edges {
                node {
                  id
                  title
                  caption
                  type
                  ... on Image {
                    asset {
                      createdDate
                      lastModifiedDate
                      id
                      url
                      title
                      height
                      width
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}

查询变量：

{
  "propertyId" : "23456832-7862-5679-4342-415f32385830",
  "first": 20
}

使用此代码段，我可以向外部服务器发送查询：

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.set("Authorization", "Bearer "+accessToken);

HttpEntity<String> entity = new HttpEntity<String>(request,headers);
String response = restTemplate.postForObject(EXTERNAL_URL, entity, String.class);

收到以下回复：

{
"data": {
    "viewer": {
        "content": {
            "contentLists": {
                "edges": [
                {
                    "node": {
                    "id": "3510e8f7-452s-f531-43b0-ac36ba979e5a9f4m",
                    "title": "Homer Simpson goes Camping",
                    "caption": "Homer Simpson goes Camping",
                    "originalPublishDate": "2018-02-18T03:31:56.352Z",
                    "lastModifiedDate": "2018-02-18T03:32:13.530Z",
                    "contents": {
                        "edges": [
                        {
                            "node": {
                                "id": "3506d951-1332-86fg-42bc-b11183db50394f40",
                                "title": "No Title",
                                "caption": "",
                                "type": "IMAGE",
                                "asset": {
                                    "createdDate": "2018-02-18T03:31:38.406Z",
                                    "lastModifiedDate": "2018-02-18T03:31:38.991Z",
                                    "id": "65037262-7169-7065-7861-7035676a6f65323467617866",
                                    "url": "",
                                    "title": "No Title",
                                    "height": null,
                                    "width": null
                                }
                            }
                        }
                    ]
                }
            }
         }
      ]
    }
  }

使用这些Java库：

<dependency>
    <groupId>com.graphql-java</groupId>
    <artifactId>graphql-java</artifactId>
    <version>8.0</version>
</dependency>

<dependency>
    <groupId>com.graphql-java</groupId>
    <artifactId>graphql-java-tools</artifactId>
    <version>5.0.0</version>
</dependency>

如何编组对POJO的POJO和/或ArrayList的响应？

是否有更好的lib可以帮助我使用Java解析/编组GraphQL？

顺便说一下，第三方服务器不提供GraphQL架构文件......

Answer 1

如果您只需要生成一次这些类并在之后的每次调用中使用它们，那么您可以将JSON下载到POJO映射工具。有很多可用的实用程序;只是在快速搜索中我找到了几个选项：

获得POJO课程后，您可以使用标准的杰克逊映射器获取课程

HttpHeaders headers = new HttpHeaders();
headers.setContentType(MediaType.APPLICATION_JSON);
headers.set("Authorization", "Bearer "+accessToken);

HttpEntity<String> entity = new HttpEntity<String>(request,headers);
String rawResponse = restTemplate.postForObject(EXTERNAL_URL, entity, String.class);

ObjectMapper objectMapper = new ObjectMapper();
PhotoQueryResponse response = objectMapper.readValue(rawResponse, PhotoQueryResponse.class);

Answer 2

你可以查看这个名为

的java库

Glitr (GraphQL to Java)以及here中的手册。

这是它支持的甜蜜类型，

GraphQLString           String
GraphQLBoolean          Boolean
GraphQLInt              Integer
GraphQLFloat            Float
GraphQLObjectType       Any POJO
GraphQLInterfaceType    Any interface type
GraphQLUnionType        Not supported
GraphQLEnumType         Any enum type
GraphQLInputObjectType  Any POJO
GraphQLList             Any implementing class of Collection
GraphQLNonNull          See @GlitrNonNull

如何解析＆amp; Marshal GraphQL对Java POJO的响应？

2 个答案: