SpringBoot 3自带的 HTTP 客户端工具

原理

Spring的HTTP 服务接口是一个带有@HttpExchange方法的 Java 接口，它支持的支持的注解类型有：

• @HttpExchange：是用于指定 HTTP 端点的通用注释。在接口级别使用时，它适用于所有方法。
• @GetExchange：为 HTTP GET请求指定@HttpExchange。
• @PostExchange：为 HTTP POST请求指定@HttpExchange。
• @PutExchange：为 HTTP PUT请求指定@HttpExchange。
• @DeleteExchange：为 HTTP DELETE请求指定@HttpExchange。
• @PatchExchange：为 HTTP PATCH请求指定@HttpExchange。

示例：访问远程接口https://api.chucknorris.io/jokes/random

第一步：添加依赖

<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-webflux</artifactId>
</dependency>

第二步：配置类

@Configuration
public class HttpConfig {@Beanpublic WebClient webClient() {return WebClient.builder().baseUrl("https://api.chucknorris.io/").build();}@Beanpublic ChuckNorrisService postClient(WebClient webClient) {HttpServiceProxyFactory httpServiceProxyFactory =HttpServiceProxyFactory.builder(WebClientAdapter.forClient(webClient)).build();return httpServiceProxyFactory.createClient(ChuckNorrisService.class);}
}

第三步：远程Service

@HttpExchange(url = "/jokes")
public interface ChuckNorrisService {//https://api.chucknorris.io/jokes/random@HttpExchange(url = "/random", method = "GET")//@GetExchange("/reduct")String reduct();}

第四步：Controller中使用远程Service

@RestController
@RequestMapping("/order")
public class OrderController {@Resourceprivate ChuckNorrisService chuckNorrisService;@GetMapping("/create")public String create() {System.out.println("下单成功！");//扣除库存String stockMsg = chuckNorrisService.reduct();return "order add success -- " + stockMsg;}}

第五步：测试