远程调用@FeignClient注解属性使用详解

@Target({ElementType.TYPE})
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface FeignClient {
    @AliasFor("name")
    String value() default "";
    
    @Deprecated
    String serviceId() default "";
    String contextId() default "";
    @AliasFor("value")
    String name() default "";
    String qualifier() default "";
    String url() default "";
    boolean decode404() default false;
    Class<?>[] configuration() default {};
    Class<?> fallback() default void.class;
    Class<?> fallbackFactory() default void.class;
    String path() default "";
    boolean primary() default true;
}

@FeignClient(name = "user.service", contextId = "userServiceA", url = "${user.service.url}", configuration = UserRemoteConfig.class)
public interface UserFeignClientA {
    
    @RequestMapping("/user/identity/default") 
    ResultData<UserVisaidentity> getDefaultIdentity(@RequestParam("userId") String userId);
}

@FeignClient(name = "user.service", contextId = "userServiceB" url = "${user.service.url}", configuration = UserRemoteConfig.class)
public interface UserFeignClientB {
    
    @RequestMapping(value = {"/user/identity/saveIdentity"}, method = RequestMethod.POST)
    ResultData<UserVisaIdentity> saveIdentity(@RequestBody UserVisaIdentity userVisaIdentity);
}

@FeignClient(name = "template-service", url = "${universal.service.url}", path = "template", configuration = {RemoteErrorDecoder.class})
public interface ITemplateFeignService {
    
    @GetMapping("/search")
    apiResult<PageResult<TemplateVo>> search(@Valid @springQueryMap TemplateSearchDto templateSearchDto);
}

@FeignClient(name = "account-service") 
 public interface AccountServiceClient { 
     @RequestMapping(method = RequestMethod.GET, value = "/accounts/{accountName}", consumes = MediaType.APPLICATION_JSON_UTF8_VALUE, fallback = AccountServiceClientFallback.class) 
     String getAccount(@PathVariable("accountName") String accountName); 
} 
@Component
public class AccountServiceClientFallback implements AccountServiceClient {
     private static final Logger LOGGER = LoggerFactory.getLogger(AccountServiceClientFallback.class); 
     @Override 
     public String getAccount(String accountName) { 
         LOGGER.error("Error during getAccount, accountName: {}", accountName); 
     } 
}

@Component
public class UserRemoteClientFallbackFactory implements FallbackFactory<UserRemoteClient> {
    private Logger logger = LoggerFactory.getLogger(UserRemoteClientFallbackFactory.class);
    @Override
    public UserRemoteClient create(Throwable cause) {
        return new UserRemoteClient() {
            @Override
            public User getUser(int id) {
                logger.error("UserRemoteClient.getUser异常", cause);
                return new User(0, "默认");
            }
        };
    }
}
@FeignClient(value = "user-service", fallbackFactory = UserRemoteClientFallbackFactory.class)
public interface UserRemoteClient {
	@GetMapping("/user/get")
	public User getUser(@RequestParam("id") int id);
}

@FeignClient(name = "optimization-user", path="user", qualifier="userRemoteClient")
public interface UserRemoteClient {
	@GetMapping("/get")
	public User getUser(@RequestParam("id") int id);
}

@Autowired
@Qualifier("userRemoteClient")
private UserRemoteClient userRemoteClient;