graphql-java 是 GraphQL 的 Java 實現(xiàn)。這個庫的目標是用于真實的生產(chǎn)環(huán)境。

graphql-java 解析和執(zhí)行查詢 GraphQL 。它并不真正獲取任何數(shù)據(jù)的：數(shù)據(jù)來源于執(zhí)行回調(diào)或提供靜態(tài)數(shù)據(jù)。

graphql-java 的 "hello world"：

import graphql.schema.GraphQLObjectType;
import graphql.schema.GraphQLSchema;
import static graphql.Scalars.GraphQLString;
import static graphql.schema.GraphQLFieldDefinition.newFieldDefinition;
import static graphql.schema.GraphQLObjectType.newObject;
public class HelloWorld {
    public static void main(String[] args) {
        GraphQLObjectType queryType = newObject()
                        .name("helloWorldQuery")
                        .field(newFieldDefinition()
                                .type(GraphQLString)
                                .name("hello")
                                .staticValue("world")
                                .build())
                        .build();
        GraphQLSchema schema = GraphQLSchema.newSchema()
                        .query(queryType)
                        .build();
        Map<String, Object> result = new GraphQL(schema).execute("{hello}").getData();
        System.out.println(result);
        // Prints: {hello=world}
    }
}