FeignIt is a declarative RESTclient. FeignHaving pluggable annotation features pluggable encoder and decoder. FeignThe default integrated Ribbonand and Eurekacombined, the default implementation of load balancing.
The introduction of dependence
Use Feign, we need to introduce spring-cloud-starter-openfeigndependence, and in order to cooperate Consul, but also the introduction of spring-cloud-starter-consul-discoverydependence:
<!-- spring cloud openfeign依赖 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
<!-- spring cloud consul依赖 -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-discovery</artifactId>
</dependency>
Feign open function
Need to use on startup class @EnableFeignClientsnotes open Feignfunction. There is no need to apply (consumers) registered to the Consulabove, there is no need to use @EnableDiscoveryClientNotes:
@SpringBootApplication
@EnableFeignClients
public class ConsulConsumerApplication {
public static void main(String[] args) {
SpringApplication.run(ConsulConsumerApplication.class, args);
}
}
Configure service-related information
Because Feginneed from the Consulservice information registration of the above, you need to configure Consuladdress. There are also configured for the current client context /consul-consumer-feign, port number 8757.
server:
address: 169.254.186.87
port: 8757
servlet:
context-path: /${spring.application.name}
spring:
application:
name: consul-consumer-feign
cloud:
consul:
host: 192.168.232.129
port: 8900
Custom Client Interface
FeginIt is to call the service interface by using annotations on the interface. @FeignClientNote describes the service name to be acquired, Feignbut also with the SpringMVCvarious interfaces to describe information such as path and interface parameters.
A definition of IService1the interface:
@FeignClient("service1") // 描述要获取的服务名
@RequestMapping("/service1") // 服务上下文路径
public interface IService1 {
@GetMapping("/hello") // 接口
public String sayHello();
}
The above interface definition can be interpreted as calling http://service1-ip:sercive1-port/service1/hellothis interface.
use
Now define a AppControllerinjected definition IService1and use it:
@RestController
public class AppController {
@Autowired
private IService1 service1;
@GetMapping("/callService1Hello")
public String callService1HelloInterface() {
return service1.sayHello();
}
}
Start client authentication
Start consul-consumer-feignthe client can call to verify service1the /hellointerfaces:
