Spring Boot + GraphQL 才是 API 的未來(lái)！

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創(chuàng)建spring boot工程

引入相關(guān)依賴

"1.0"?encoding="UTF-8"?>
"http://maven.apache.org/POM/4.0.0"?xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
?xsi:schemaLocation="http://maven.apache.org/POM/4.0.0?https://maven.apache.org/xsd/maven-4.0.0.xsd">
?4.0.0
?
??org.springframework.boot
??spring-boot-starter-parent
??2.4.6
???
?
?com.xuxd
?graphql.demo
?0.0.1-SNAPSHOT
?graphql.demo
?GraphQL?Demo?project?for?Spring?Boot
?
??1.8
??1.8
??1.8
??UTF-8
??UTF-8
??1.18.20
??11.0.1
??2.8.7
?
?
??
???org.springframework.boot
???spring-boot-starter
??

??
???org.springframework.boot
???spring-boot-starter-web
??

??
???org.springframework.boot
???spring-boot-starter-test
???test
??

??
???org.projectlombok
???lombok
???${lombok.version}
???provided
??

??
???com.graphql-java-kickstart
???graphql-java-tools
???${graphql-java-tools.version}
??

??
???com.google.code.gson
???gson
???${gson.version}
??
?

?
??
???
????org.springframework.boot
????spring-boot-maven-plugin
???
??
?

初始化GraphQL實(shí)例

@Component
public?class?GraphQLProvider?{

????private?GraphQL?graphQL;

????@Autowired
????private?IItemService?itemService;

????@Bean
????public?GraphQL?graphQL()?{
????????return?graphQL;
????}

????@PostConstruct
????public?void?init()?throws?IOException?{
????????GraphQLSchema?graphQLSchema?=?SchemaParser.newParser()
????????????.file("graphql/base.graphqls")
????????????.resolvers(new?Query(),?new?Mutation())
????????????.file("graphql/item.graphqls")
????????????.resolvers(new?ItemResolver(itemService))
//????????????.file("book.graphqls")
//????????????.resolvers(new?BookResolver())??//其它定義照上面的示例，繼續(xù)增加
????????????.build().makeExecutableSchema();

????????this.graphQL?=?graphQL.newGraphQL(graphQLSchema).build();
????}

}

schema?{
????#?查詢
????query:?Query
????#?更新
????mutation:?Mutation
}

type?Query?{
????version:?String
}

type?Mutation?{
????version:?String
}

#?定義一個(gè)查詢類型
extend?type?Query?{
????queryItemList:?ItemList??#?定義查詢項(xiàng)目列表
????queryById(id:?ID):?Item
}

extend?type?Mutation?{
????updateName(param:?Param):?Item
}

#?定義項(xiàng)目字段
type?Item?{
????id:?ID!
????code:?String!
????name:?String!
}

type?ItemList?{
????itemList:?[Item!]!??#獲取項(xiàng)目列表
????total:?Int!??????#?獲取項(xiàng)目總數(shù)
}

input?Param?{
????id:?ID!
????name:?String!
}

public?class?ItemResolver?implements?GraphQLQueryResolver,?GraphQLMutationResolver?{

????private?IItemService?itemService;

????public?ItemResolver(IItemService?itemService)?{
????????this.itemService?=?itemService;
????}

????//?對(duì)應(yīng)item.graphqls里的queryItemList
????public?ItemList?queryItemList()?{
????????return?itemService.queryItemList();
????}

????public?Item?queryById(Long?id)?{
????????return?itemService.queryById(id);
????}

????public?Item?updateName(Param?param)?{
????????return?itemService.updateName(param);
????}
}

提供API

?result?=?new?HashMap<>();????????ExecutionResult?executionResult?=?graphQL.execute(executionInput);????????List?errors?=?executionResult.getErrors();????????if?(errors?!=?null?&&?!errors.isEmpty())?{????????????result.put("errors",?errors);????????????return?result;????????}????????return?executionResult.getData();????}}" tab="innerlink" data-linktype="2" wah-hotarea="click" style="outline: 0px; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); cursor: pointer; max-width: 100%; box-sizing: border-box !important; overflow-wrap: break-word !important;">@RestController
@RequestMapping("/graphql")
@Log
public?class?GraphqlController?{

????@Autowired
????private?GraphQL?graphQL;

????@PostMapping
????public?Object?execute(@RequestBody?GraphqlRequest?request)?{
????????ExecutionInput?executionInput?=?ExecutionInput.newExecutionInput()
????????????.query(request.getQuery())
????????????.variables(request.getVariables())
????????????.build();
????????Map?result?=?new?HashMap<>();

????????ExecutionResult?executionResult?=?graphQL.execute(executionInput);
????????List?errors?=?executionResult.getErrors();

????????if?(errors?!=?null?&&?!errors.isEmpty())?{
????????????result.put("errors",?errors);
????????????return?result;
????????}
????????return?executionResult.getData();
????}
}

測(cè)試

ItemList?queryItemList();

Item?queryById(Long?id);

Item?updateName(Param?param);

結(jié)束語(yǔ)

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