Spring Boot + GraphQL 才是 API 的未来!
Java技术江湖
共 4455字,需浏览 9分钟
·
2021-10-27 16:41
快速开始
创建spring boot工程
引入相关依赖
"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实例
@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()) //其它定义照上面的示例,继续增加
.build().makeExecutableSchema();
this.graphQL = graphQL.newGraphQL(graphQLSchema).build();
}
}
*.graphqls
或者对应的Resolver如ItemResolver,可以参看浅尝GraphQL相关描述,这里只是作了微调整,相关代码如下:schema {
# 查询
query: Query
# 更新
mutation: Mutation
}
type Query {
version: String
}
type Mutation {
version: String
}
# 定义一个查询类型
extend type Query {
queryItemList: ItemList # 定义查询项目列表
queryById(id: ID): Item
}
extend type Mutation {
updateName(param: Param): Item
}
# 定义项目字段
type Item {
id: ID!
code: String!
name: String!
}
type ItemList {
itemList: [Item!]! #获取项目列表
total: Int! # 获取项目总数
}
input Param {
id: ID!
name: String!
}
public class ItemResolver implements GraphQLQueryResolver, GraphQLMutationResolver {
private IItemService itemService;
public ItemResolver(IItemService itemService) {
this.itemService = itemService;
}
// 对应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
@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();
Mapresult = new HashMap<>();
ExecutionResult executionResult = graphQL.execute(executionInput);
Listerrors = executionResult.getErrors();
if (errors != null && !errors.isEmpty()) {
result.put("errors", errors);
return result;
}
return executionResult.getData();
}
}
测试
ItemList queryItemList();
Item queryById(Long id);
Item updateName(Param param);
结束语
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