RequestInterceptor概述

Feign支持请求拦截器，在发送请求前，对发送的模板进行操作，例如设置请求头等属性。

public interface RequestInterceptor {

  /**
   * 每个请求都会调用apply方法
   */
  void apply(RequestTemplate template);
}

自定义拦截器

自定义拦截器

@Configuration
@Slf4j
public class FeignClientInterceptorConfig implements RequestInterceptor {

    @Override
    public void apply(RequestTemplate requestTemplate) {
        log.info("feign interceptor entered");
		// 设置请求头信息
        requestTemplate.header("authKey","myKeyInfo");
    }
}

配置到FeignClient

@Component
//                       服务提供者名称
@FeignClient(value = "cloud-provider-service", configuration = {FeignClientInterceptorConfig.class, FeignConfig.class})
public interface RemoteUserService {

    @RequestMapping("/user/search/v1") // 要调用的接口
    RestResult<List<UserTest>> searchUser(@RequestBody UserTest userTest);

}

服务提供端获取请求头

@ApiOperation(value = "查询用户")
@PostMapping(value = "/search/v1")
public RestResult<List<UserTest>> search(@RequestBody UserTest userTest, HttpServletRequest request) {

    try {

        String authKey = request.getHeader("authKey");
        log.info("自定义Header值 authKey：[{}]",authKey);

        List<UserTest> userTests = userTestService.selectList(userTest);

        log.info("查询成功：端口号：{}", serverPort);

        return RestResult.success(userTests, ResultCode.SUCCESS);
    } catch (Exception e) {
        return RestResult.fail(ResultCode.DATA_ACCESS_ERROR);
    }

}

消费端测试

@RestController
@Api(tags = "消费端")
public class ConsumerController {

    @Autowired
    private RemoteUserService remoteUserService;

    @ApiOperation(value="查询用户")
    @PostMapping(value = "/search/v2")
    public RestResult<List<UserTest>> searchUser(@RequestBody UserTest userTest) {

        try {

            RestResult<List<UserTest>> listRestResult = remoteUserService.searchUser(userTest);

            return listRestResult;

        } catch (Exception e) {
            return RestResult.fail(ResultCode.DATA_ACCESS_ERROR);
        }

    }
}

调用接口：http://localhost/search/v2

服务端成功获取到自己设置的Header

请求信息