Feign客户端子域：模糊映射答案

【问题标题】：Feign client sub-domain : ambiguous mappingFeign客户端子域：模糊映射
【发布时间】：2019-03-16 11:29:19
【问题描述】：

我正在使用 Spring Boot 2.0.3.RELEASE 和 openFeign：

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>

我在我的项目中声明了两个假客户：

@FeignClient(name = "appleReceiptSandboxFeignClient",
    url = "https://sandbox.itunes.apple.com",
    configuration = Conf.class)
@RequestMapping(produces = "application/json", consumes = "application/json")
public interface AppleReceiptSandboxFeignClient {

    @RequestMapping(value = "/verifyReceipt", method = RequestMethod.POST)
    AppleReceiptResponseDTO sandboxVerifyReceipt(@RequestBody AppleReceiptRequestDTO dto);

}

@FeignClient(name = "appleReceiptFeignClient",
    url = "https://buy.itunes.apple.com")
@RequestMapping(produces = "application/json", consumes = "application/json")
public interface AppleReceiptFeignClient {

    @RequestMapping(value = "/verifyReceipt", method = RequestMethod.POST)
    AppleReceiptResponseDTO productionVerifyReceipt(@RequestBody AppleReceiptRequestDTO dto);

}

我的问题是，即使base urls和name不一样，似乎feign客户端也被认为是冲突的。

java.lang.IllegalStateException: Ambiguous mapping. Cannot map 'com.myproject.central.client.AppleReceiptSandboxFeignClient' method 
public abstract com.myproject.central.client.dto.AppleReceiptResponseDTO com.myproject.central.client.AppleReceiptSandboxFeignClient.sandboxVerifyReceipt(com.myproject.central.client.dto.AppleReceiptRequestDTO)
to {[/verifyReceipt],methods=[POST],consumes=[application/json],produces=[application/json]}: There is already 'com.myproject.central.client.AppleReceiptFeignClient' bean method
public abstract com.myproject.central.client.dto.AppleReceiptResponseDTO com.myproject.central.client.AppleReceiptFeignClient.productionVerifyReceipt(com.myproject.central.client.dto.AppleReceiptRequestDTO) mapped.

即使这个映射错误是意料之外的，我也乐于解决问题。

我显然不能在同一个 feign 客户端中声明两个端点，因为子域不同，或者我错过了什么？

我的问题是：仅使用 feign 客户端最简单的解决方法（如果有的话）是什么？

【问题讨论】：

标签： spring-boot spring-cloud-feign

【解决方案1】：

当您使用@RequestMapping 注释接口或类时，即使您有@FeignClient 注释，Spring 也会注册一个处理程序。您可以通过从接口中删除注释并仅在方法上使用它来解决此问题。

@FeignClient(name = "appleReceiptSandboxFeignClient",
        url = "https://sandbox.itunes.apple.com",
        configuration = Conf.class)
public interface AppleReceiptSandboxFeignClient {

    @RequestMapping(value = "/verifyReceipt", method = RequestMethod.POST, produces = "application/json", consumes = "application/json", pro)
    AppleReceiptResponseDTO sandboxVerifyReceipt(@RequestBody AppleReceiptRequestDTO dto);

}

@FeignClient(name = "appleReceiptFeignClient",
        url = "https://buy.itunes.apple.com")
public interface AppleReceiptFeignClient {

    @RequestMapping(value = "/verifyReceipt", method = RequestMethod.POST, produces = "application/json", consumes = "application/json")
    AppleReceiptResponseDTO productionVerifyReceipt(@RequestBody AppleReceiptRequestDTO dto);

}

【讨论】：