Spring Boot中集成GraphQL查詢

在Spring Boot中集成GraphQL查詢，你需要遵循以下步驟：

1. 添加依賴

在你的pom.xml文件中添加以下依賴：

<dependency>
    <groupId>com.graphql-java-kickstart</groupId>
    <artifactId>graphql-spring-boot-starter</artifactId>
    <version>11.1.0</version>
</dependency>
<dependency>
    <groupId>com.graphql-java-kickstart</groupId>
    <artifactId>graphiql-spring-boot-starter</artifactId>
    <version>11.1.0</version>
</dependency>

2. 創(chuàng)建GraphQL Schema

創(chuàng)建一個(gè)GraphQL schema文件，例如schema.graphqls，并將其放在src/main/resources/graphql目錄下。在這個(gè)文件中定義你的類型、查詢和突變：

type Query {
    hello: String
}

3. 配置GraphQL

創(chuàng)建一個(gè)配置類，例如GraphQLConfig.java，并繼承GraphQLSpringBootConfiguration類。在這個(gè)類中，你需要配置GraphQL的Schema文件路徑：

import com.coxautodev.graphql.tools.SchemaParser;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.graphql.execution.GraphQLQueryResolver;
import org.springframework.graphql.execution.GraphQLMutationResolver;
import org.springframework.graphql.schema.GraphQLSchema;
import org.springframework.graphql.schema.idl.RuntimeWiring;
import org.springframework.graphql.schema.idl.SchemaGenerator;
import org.springframework.graphql.schema.idl.TypeRuntimeWiring;

@Configuration
public class GraphQLConfig {

    @Bean
    public GraphQLSchema graphQLSchema() {
        SchemaParser schemaParser = new SchemaParser();
        schemaParser.setResourceDirectory(new ClassPathResource("graphql"));
        return schemaParser.parse();
    }

    @Bean
    public RuntimeWiring runtimeWiring() {
        return RuntimeWiring.newRuntimeWiring()
                .type(TypeRuntimeWiring.newTypeWiring("Query")
                        .dataFetcher("hello", new GraphQLQueryResolver() {
                            @Override
                            public String hello() {
                                return "Hello, GraphQL!";
                            }
                        }))
                .build();
    }
}

4. 創(chuàng)建GraphQL Controller

創(chuàng)建一個(gè)控制器，例如GraphQLController.java，并添加一個(gè)POST請(qǐng)求映射，以便客戶端可以通過HTTP POST請(qǐng)求執(zhí)行GraphQL查詢：

import org.springframework.graphql.execution.GraphQLQueryResolver;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class GraphQLController implements GraphQLQueryResolver {

    @PostMapping("/graphql")
    public String graphQL(@RequestBody String query) {
        return query;
    }
}

現(xiàn)在，你已經(jīng)成功地在Spring Boot中集成了GraphQL查詢。你可以通過發(fā)送一個(gè)包含GraphQL查詢的POST請(qǐng)求到/graphql端點(diǎn)來測試它。例如，使用curl發(fā)送請(qǐng)求：

curl -X POST -H "Content-Type: application/json" -d '{"query": "{ hello }"}' http://localhost:8080/graphql

響應(yīng)應(yīng)該是：

{
  "data": {
    "hello": "Hello, GraphQL!"
  }
}