How to upload files with graphql-java?

Question

I can\'t find out how to upload files if i use graphql-java, can someone show me a demo? I will be appreciated!

reference : https://github.com/graphql-java-kickstar

Answer 1

Just to add onto the answers above, for anyone like me who could find 0 examples of file upload with the GraphQLSchemaGenerator vs the schema first approach, you have to just create a TypeMapper and add that to your GraphQLSchemaGenerator:

public class FileUploadMapper implements TypeMapper {

  @Override
  public GraphQLOutputType toGraphQLType(
      final AnnotatedType javaType, final OperationMapper operationMapper,
      final Set> mappersToSkip, final BuildContext buildContext) {
    return MyScalars.FileUpload;
  }

  @Override
  public GraphQLInputType toGraphQLInputType(
      final AnnotatedType javaType, final OperationMapper operationMapper,
      final Set> mappersToSkip, final BuildContext buildContext) {
    return MyScalars.FileUpload;
  }

  @Override
  public boolean supports(final AnnotatedType type) {
     return type.getType().equals(FileUpload.class); //class of your fileUpload POJO from the previous answer
  }
}

then in your GraphQL @Configuration file where you are building your GraphQLSchema:

public GraphQLSchema schema(GraphQLSchemaGenerator schemaGenerator) {
    return schemaGenerator
        .withTypeMappers(new FileUploadMapper()) //add this line
        .generate();
  }

Then in your mutation resolver

  @GraphQLMutation(name = "fileUpload")
  public void fileUpload(      
      @GraphQLArgument(name = "file") FileUpload fileUpload //type here must be the POJO.class referenced in your TypeMapper
  ) {
    //do something with the byte[] from fileUpload.getContent();
    return;
  }