独立设置

如果您的应用程序未使用 Spring Boot，则您负责设置相关的 Spring for GraphQL 组件。 假设您的应用程序已经为 Spring MVC 控制器进行了配置，则最低设置将需要多个 bean。spring-doc.cadn.net.cn

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 The AnnotatedControllerConfigurer bean is responsible for detecting GraphQL @Controller handlers.
2 The ExecutionGraphQlService processes GraphQL requests in a transport-agnostic fashion.
3 The GraphQlSource builder is the main configuration point. Explore its API for more options.
4 The RouterFunction exposes the GraphQL routes as functional endpoints.
5 You can then expose various transports (WebSocket, SSE, HTTP) over different routes.

Spring for GraphQL offers many other options and integrations with Spring projects. For more on this, you can explore the Spring Boot auto-configurations.spring-doc.cadn.net.cn