Graphql应用探索

我就是我 2022-05-25 13:10 133阅读 0赞

记录一下graphql项目搭建的过程，graphql的原理啥的请参考如下优秀的文章：

http://blog.mygraphql.com/wordpress/?p=108

http://www.zhaiqianfeng.com/2017/06/learn-graphql-action-by-java.html

https://github.com/graphql-java/awesome-graphql-java

一：graphql服务生成

1，从代码构建，如下示例

/**
         * 从代码生成graphql
         */
        private void LoadGraphQLFromCode() {
            //酒店品牌类型
            GraphQLObjectType brandInfoType = newObject().name("brandInfo").description("品牌信息")
                    .field(newFieldDefinition().name("brandId").description("品牌id").type(GraphQLInt).build())
                    .field(newFieldDefinition().name("brandName").description("品牌名称").type(GraphQLString).build())
                    .field(newFieldDefinition().name("brandUrl").description("品牌url").type(GraphQLString).build())
                    .build();
            //酒店设施类型
            GraphQLObjectType hotelFacilityType = newObject().name("hotelFacility").description("酒店设施")
                    .field(newFieldDefinition().name("facilityId").description("设施id").type(GraphQLInt).build())
                    .field(newFieldDefinition().name("facilityNameCn").description("中文名").type(GraphQLString).build())
                    .field(newFieldDefinition().name("facilityTypeId").description("类型id").type(GraphQLInt).build())
                    .build();
    
            //定义客户端使用的酒店详情类型
            GraphQLObjectType hotelDetailType = GraphQLObjectType.newObject()
                    .name("HoteleDetailInfo")
                    .description("酒店详情")
                    .field(newFieldDefinition().name("hotelName").description("酒店名").type(GraphQLString).build())
                    .field(newFieldDefinition().name("address").description("地址").type(GraphQLString).build())
                    .field(newFieldDefinition().name("description").description("描述").type(GraphQLString).build())
                    .field(newFieldDefinition().name("baiduLatitude").description("百度经纬度").type(GraphQLString).build())
                    .field(newFieldDefinition().name("baiduLongitude").description("百度经纬度").type(GraphQLString).build())
                    .field(newFieldDefinition().name("cityName").description("城市名").type(GraphQLString).build())
                    .field(newFieldDefinition().name("trafficInfo").description("交通信息").type(GraphQLString).build())
                    .field(newFieldDefinition().name("brandInfo").description("品牌信息").type(brandInfoType).build())
                    .field(newFieldDefinition().name("hotelFacilityList").description("设施列表").type(new GraphQLList(hotelFacilityType)).build())
                    .build();
    
    //        //客户端看到的输入
    //        GraphQLInputType hotelDetalInput = newInputObject()
    //                .name("hotelDetailInput")
    //                .field(GraphQLInputObjectField.newInputObjectField().name("hotelId").description("酒店id").type(GraphQLString).build())
    //                .field(GraphQLInputObjectField.newInputObjectField().name("checkInDate").description("入住日期").type(GraphQLString).build())
    //                .field(GraphQLInputObjectField.newInputObjectField().name("checkOutDate").description("离店日期").type(GraphQLString).build())
    //                .build();
    
            //客户端的queryapi
            GraphQLObjectType queryType = GraphQLObjectType.newObject()
                    .name("hotelDetailQuery")
                    .field(GraphQLFieldDefinition.newFieldDefinition()
                            .type(hotelDetailType)
                            .name("hotelDetail")
                            .argument(GraphQLArgument.newArgument()
                                    .name("hotelId")
                                    .description("酒店id 必填")
                                    .type(new GraphQLNonNull(GraphQLInt))
                                    .build())
                            .argument(GraphQLArgument.newArgument()
                                    .name("checkInDate")
                                    .description("入住日期")
                                    .type(GraphQLString)
                                    .build())
                            .argument(GraphQLArgument.newArgument()
                                    .name("checkOutDate")
                                    .description("离店日期")
                                    .type(GraphQLString)
                                    .build())
                            .dataFetcher(env -> {
                                return hotelDetailDataFetcher(env);
                            })
                            .build())
                    .build();
    
            //创建schema
            GraphQLSchema schema = GraphQLSchema.newSchema()
                    .query(queryType)
                    .build();
    
            //创建graphql
            GraphQL graphQL = GraphQL.newGraphQL(schema).build();
            HotelDetailGraphQl = graphQL;
        }

2，从graphql文件生成

schema{
        #酒店
        query : hotelDetailQuery
    }
    type hotelDetailQuery{
        #详情搜索
        hotelDetail(hotelId:Int!,checkInDate:String,checkOutDate:String):HoteleDetailInfo
        #酒店点评概要信息
        hotelComment(hotelId:Int!) : hotelCommentInfo
    }
    #酒店点评概要信息
    type hotelCommentInfo{
        #点评总数
        commentCount:Int
        #点评分数
        commentScore:String
        #语义标签
        hotelDetailCommentTags:[hotelDetailCommentTagsType]
    }
    #点评标签类型
    type hotelDetailCommentTagsType{
        #标签数
        commentCount:Int
        #类型id
        mainTagId:Int
        #类型名
        mainTagName:String
    }
    #品牌类型
    type brandInfo{
        #品牌id
        brandId:Int
        #品牌名
        brandName:String
        #品牌链接
        brandUrl:String
    }
    #设施
    type hotelFacility{
        #设施id
        facilityId:Int
        #设施名
        facilityNameCn:String
        #id
        facilityTypeId:String
    }
    #酒店详情
    type HoteleDetailInfo{
        #名称
        hotelName:String
        #地址
        address:String
        #描述
        description:String
        #经纬度
        baiduLatitude:String
        #经纬度
        baiduLongitude:String
        #城市名
        cityName:String
        #交通信息
        trafficInfo:String
        #品牌信息
        brandInfo:brandInfo
        #设施信息
        hotelFacilityList:[hotelFacility]
    }

/**
     * 从文本读取
     */
    private void LoadGraphQLFromFile() {
        try {
            InputStream readin = GraphQLHotelDetailDao.class.getResourceAsStream("sdls/hoteldetail.graphql");
            InputStreamReader reader = new InputStreamReader(readin, "utf-8");
            SchemaParser schemaParser = new SchemaParser();
            SchemaGenerator schemaGenerator = new SchemaGenerator();
            TypeDefinitionRegistry typeRegistry = schemaParser.parse(reader);
            RuntimeWiring wiring = buildRuntimeWiring();
            GraphQLSchema schema = schemaGenerator.makeExecutableSchema(typeRegistry, wiring);
    
            //创建graphql
            GraphQL graphQL = GraphQL.newGraphQL(schema).build();
            HotelDetailGraphQl = graphQL;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

RuntimeWiring buildRuntimeWiring() {
            return RuntimeWiring.newRuntimeWiring()
                    .type("hotelDetailQuery", typeWiring -> typeWiring
                            .dataFetcher("hotelDetail", getHotelDetailDataFetcher())
                    )
                    .type("hotelDetailQuery", typeWiring -> typeWiring
                            .dataFetcher("hotelComment", getHotelCommentDataFetcher()))
                    .build();
        }

private Object hotelDetailDataFetcher(DataFetchingEnvironment env) {
            int hotelId = env.getArgument("hotelId");
            String checkInDate = env.getArgument("checkInDate");
            String checkOutDate = env.getArgument("checkOutDate");
    
            Date checkIn;
            Date checkOut;
            try {
                SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
                checkIn = format.parse(checkInDate);
                checkOut = format.parse(checkOutDate);
            } catch (Exception e) {
                e.printStackTrace();
                checkIn = new Date();
                Calendar c = Calendar.getInstance();
                c.setTime(checkIn);
                // 今天+1天
                c.add(Calendar.DAY_OF_MONTH, 1);
                checkOut = c.getTime();
            }
            String formatUrl = "****";
            String reqUrl = String.format(formatUrl, hotelId, checkIn.getTime() / 1000, checkOut.getTime() / 1000);
            String result = HttpClientHelper.sendGet2(reqUrl, null, "utf-8");
            HotelInfoBody hotelInfoModel = JSON.parseObject(result, HotelInfoBody.class);
            return hotelInfoModel.getBody().getHotelInfoModel();
        }

DataFetcher getHotelCommentDataFetcher() {
            return new DataFetcher() {
                @Override
                public Object get(DataFetchingEnvironment env) {
                    return hotelCommentInfoDataFetcher(env);
                }
            };
        }

二：预先生成graphql服务注入到controller，有请求进来直接查询就好了