如何用GraphQL-Java上传文件？

Question

@Component
public class FilesUpload implements GraphQLMutationResolver {

    public Boolean testMultiFilesUpload(List<Part> parts, DataFetchingEnvironment env) {
        // get file parts from DataFetchingEnvironment, the parts parameter is not used
        List<Part> attchmentParts = env.getArgument("files");
        System.out.println(attchmentParts);
        return true;
    }
}

type Mutation {
    testSingleFileUpload(file: Upload): UploadResult
}

Answer 1

>

在模式中定义标量类型

标量上载

我们应该为上传配置GraphQLScalarType，使用如下：

@Configuration
public class GraphqlConfig {

   @Bean
   public GraphQLScalarType uploadScalarDefine() {
      return ApolloScalars.Upload;
   } 
}

type Mutation {
  testMultiFilesUpload(files: [Upload!]!): Boolean
}

public Boolean testMultiFilesUpload(List<Part> parts, DataFetchingEnvironment env) {
    // get file parts from DataFetchingEnvironment, the parts parameter is not use
    List<Part> attachmentParts = env.getArgument("files");
    int i = 1;
    for (Part part : attachmentParts) {
      String uploadName = "copy" + i;
      try {
        part.write("your path:" + uploadName);
      } catch (IOException e) {
        e.printStackTrace();
      }
      i++;
    }
    return true;   
  }
}

public class PartDeserializer extends JsonDeserializer<Part> {

  @Override
  public Part deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {         
     return null;
  }
}

getArgument（“文件”）

将其注册到ObjectMapper：

@Bean
public ObjectMapper objectMapper() {
  ObjectMapper objectMapper = new ObjectMapper();
  objectMapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
  SimpleModule module = new SimpleModule();
  module.addDeserializer(Part.class, new PartDeserializer());
  objectMapper.registerModule(module);
  return objectMapper;
}

operations

{ "query": "mutation($files: [Upload!]!) {testMultiFilesUpload(files:$files)}", "variables": {"files": [null,null] } }

map

{ "file0": ["variables.files.0"] , "file1":["variables.files.1"]}

file0

your file

file1

your file

像这样：