如何使用graphql-java从请求头设置上下文

import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import graphql.ExecutionInput;
import graphql.ExecutionResult;
import graphql.GraphQL;
import graphql.schema.GraphQLSchema;
import graphql.schema.StaticDataFetcher;
import graphql.schema.idl.RuntimeWiring;
import graphql.schema.idl.SchemaGenerator;
import graphql.schema.idl.SchemaParser;
import graphql.schema.idl.TypeDefinitionRegistry;

@WebServlet(urlPatterns = "/graphql")
public class GraphQLServlet extends HttpServlet {

  private GraphQL graphQL;

  @Override
  public void init() {
    // 创建GraphQLSchema，这里使用GraphQL-java的示例代码
    String schema = "type Query{hello: String}";
    SchemaParser schemaParser = new SchemaParser();
    TypeDefinitionRegistry typeDefinitionRegistry = schemaParser.parse(schema);
    RuntimeWiring runtimeWiring = RuntimeWiring.newRuntimeWiring()
        .type("Query", builder -> builder.dataFetcher("hello", new StaticDataFetcher("world")))
        .build();
    GraphQLSchema graphQLSchema = new SchemaGenerator().makeExecutableSchema(typeDefinitionRegistry, runtimeWiring);

    // 创建GraphQL对象
    graphQL = GraphQL.newGraphQL(graphQLSchema).build();
  }

  @Override
  protected void doPost(HttpServletRequest req, HttpServletResponse resp) {
    // 从请求头获取需要的数据
    String authToken = req.getHeader("Auth-Token");
    String userId = req.getHeader("User-Id");

    // 创建GraphQL上下文对象
    GraphQLContext context = new GraphQLContext(authToken, userId);

    // 创建GraphQL执行输入对象，并将上下文对象设置到其中
    ExecutionInput executionInput = ExecutionInput.newExecutionInput()
        .query(req.getParameter("query"))
        .operationName(req.getParameter("operationName"))
        .context(context)
        .build();

    // 执行GraphQL查询
    ExecutionResult executionResult = graphQL.execute(executionInput);

    // 将执行结果返回给客户端
    // ...
  }
}

public class GraphQLContext {

  private String authToken;
  private String userId;

  public GraphQLContext(String authToken, String userId) {
    this.authToken = authToken;
    this.userId = userId;
  }

  public String getAuthToken() {
    return authToken;
  }

  public String getUserId() {
    return userId;
  }
}