Feign的使用-CFANZ编程社区

Feign的使用

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2023-11-12

1.http客户端Feign

RestTemplate方式调用存在的问题

e/user/" + order. getUserId();
User user = restTemp1ate.getForObject(ur1, User. class);

2.Feign的介绍

Efiü: https://github.com/OpenFeign/feign
Feign makes writing java http clients easier
(litter i0in 0 PASSED
maven central Il
Feign is a Java to HTTP client binder inspired by Retrofit, JAXRS-2.O, and WebSocket. Feign's first goal was
reducing the complexity of binding Denominator uniformly to HTTP APIs regardless of ReSTfulness.

3.定义使用Feign客户端

<groupld.org . springframework . cloud< / groupld>
starter-openfeign</artifactld>
@SpringB00tAppIication
public class OrderAppIication
public static void args) {
SpringApp1ication. run (OrderAppLication. class ,
args) ;

public interface UserC1ient {
User Long id);
AEßZfi: userservice
• iå*fiit: GET
• MEG: /user/{id)
• Msn: Long id
• User

@Autowired
private UserCIient userCIient;
public Order queryOrderById(Long orderld) {
= orderMapper.findById(orderId);
Order order
// 2. f///{/FeignQ&'httpiå>ß,
User user
// 3. frkuser9/J0rder
order. setUser(user) ;
// 4. BPI
return order;

总结

Feign的使用_Feign的使用_02

未命名图片.png, FeignfiVt%:
O SIÀfeign-httpClient4üü
@ EHÑ#HEhttpClientlhfiE,
2.

未命名图片.png, 2.
3.
4.
5.
$€hfeign-api,
User.
Gorder-service#GlÄfeign-apifi4Nft
产生的问题定义的FeignClient无法被springMVC扫描，
UserClient' that could not be found.

解决方案：
未命名图片.png, fiit—:
= "cn .itcast.feign.ctients")
fritz:
= {UserC1ient. class})

总结
未命名图片.png, @ 8FeignClient, POJO*

未命名图片.png, FeignC1ientFfiGfi@

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