獨立設定

如果您的應用程式沒有使用 Spring Boot，則您需要負責設定相關的 Spring for GraphQL 元件。假設您的應用程式已經配置了 Spring MVC 控制器，那麼最少的設定將需要幾個 bean。

import java.util.List;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.graphql.ExecutionGraphQlService;
import org.springframework.graphql.data.method.annotation.support.AnnotatedControllerConfigurer;
import org.springframework.graphql.execution.ConnectionTypeDefinitionConfigurer;
import org.springframework.graphql.execution.DefaultBatchLoaderRegistry;
import org.springframework.graphql.execution.DefaultExecutionGraphQlService;
import org.springframework.graphql.execution.GraphQlSource;
import org.springframework.graphql.server.WebGraphQlHandler;
import org.springframework.graphql.server.webmvc.GraphQlHttpHandler;
import org.springframework.graphql.server.webmvc.GraphQlRequestPredicates;
import org.springframework.graphql.server.webmvc.GraphiQlHandler;
import org.springframework.web.servlet.function.RequestPredicate;
import org.springframework.web.servlet.function.RouterFunction;
import org.springframework.web.servlet.function.RouterFunctions;
import org.springframework.web.servlet.function.ServerResponse;

@Configuration(proxyBeanMethods = false)
public class GraphQlConfiguration {

	@Bean (1)
	public AnnotatedControllerConfigurer controllerConfigurer() {
		return new AnnotatedControllerConfigurer();
	}

	@Bean (2)
	public ExecutionGraphQlService executionGraphQlService(AnnotatedControllerConfigurer controllerConfigurer) {
		GraphQlSource graphQlSource = GraphQlSource.schemaResourceBuilder() (3)
				.schemaResources(new ClassPathResource("graphql/schema.graphqls"))
				.configureTypeDefinitions(new ConnectionTypeDefinitionConfigurer())
				.configureRuntimeWiring(controllerConfigurer)
				.exceptionResolvers(List.of(controllerConfigurer.getExceptionResolver()))
				.build();
		DefaultBatchLoaderRegistry batchLoaderRegistry = new DefaultBatchLoaderRegistry();
		DefaultExecutionGraphQlService service = new DefaultExecutionGraphQlService(graphQlSource);
		service.addDataLoaderRegistrar(batchLoaderRegistry);
		return service;
	}


	@Bean (4)
	public RouterFunction<ServerResponse> graphQlRouterFunction(ExecutionGraphQlService graphQlService) {
		WebGraphQlHandler webGraphQlHandler = WebGraphQlHandler.builder(graphQlService).build();
		GraphQlHttpHandler graphQlHttpHandler = new GraphQlHttpHandler(webGraphQlHandler);
		RequestPredicate graphQlPredicate = GraphQlRequestPredicates.graphQlHttp("/graphql");
		GraphiQlHandler graphiQlHandler = new GraphiQlHandler("/graphql", "");
		return RouterFunctions.route() (5)
				.route(graphQlPredicate, graphQlHttpHandler::handleRequest)
				.GET("/graphiql", graphiQlHandler::handleRequest)
				.build();
	}
}

1	`AnnotatedControllerConfigurer` bean 負責檢測 GraphQL `@Controller` 處理器。
2	`ExecutionGraphQlService` 以與傳輸無關的方式處理 GraphQL 請求。
3	`GraphQlSource` 構建器是主要的配置點。探索其 API 以獲取更多選項。
4	`RouterFunction` 將 GraphQL 路由公開為函式式端點。
5	然後，您可以透過不同的路由公開各種傳輸（WebSocket、SSE、HTTP）。

Spring for GraphQL 提供了許多其他選項以及與 Spring 專案的整合。有關更多資訊，您可以探索 Spring Boot 自動配置。