SpringCloud使用Feign实现远程调用的使用示例

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

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.openfeign.EnableFeignClients;
@SpringBootApplication
@EnableFeignClients
public class YourApplication {
    public static void main(String[] args) {
        SpringApplication.run(YourApplication.class, args);
    }
}

import org.springframework.cloud.openfeign.FeignClient;
import org.springframework.web.bind.annotation.GetMapping;
@FeignClient(name = "remoteservice")  // 指定要调用的服务名称
public interface RemoteServiceClient {
	@GetMapping("/api/resource/{id}")
    Resource getResourceById(@PathVariable("id") Long id);
    @PostMapping("/api/resource")
    Resource createResource(@RequestBody Resource resource);
}

@Service
public class MyService {
    private final ExampleFeignClient feignClient;
    @Autowired
    public MyService(ExampleFeignClient feignClient) {
        this.feignClient = feignClient;
    }
    public Resource getResourceById(Long id) {
        return feignClient.getResourceById(id);
    }
    public Resource createResource(Resource resource) {
        return feignClient.createResource(resource);
    }
}

feign:
  client:
    config:
      default: # 这里用default就是全局配置，如果是写服务名称，则是针对某个微服务的配置
        connectTimeout: 5000 # 连接超时时间
        readTimeout: 5000    # 读取超时时间
        loggerLevel: FULL #  日志级别 

@FeignClient(name = "remoteservice")
public interface RemoteServiceClient {
    @GetMapping("/api/resource")
    @RequestLine("GET /api/resource")
    @Headers("Accept: application/json")
    @Timeout(3000) // 设置超时时间为 3 秒
    String getResource();
}

@Configuration
public class FeignConfig {
	@Bean
    public Logger.Level feignLogLevel(){
        return Logger.Level.BASIC; // 日志级别为BASIC
    }
    @Bean
    public Request.Options requestOptions() {
        return new Request.Options(5000, 5000); // 设置连接超时和读取超时时间
    }
}

@PropertySource("classpath:feign-custom.properties")
@SpringBootApplication
@EnableFeignClients
public class YourApplication {
    public static void main(String[] args) {
        SpringApplication.run(YourApplication.class, args);
    }
}

feign.client.config.default.connectTimeout=5000
feign.client.config.default.readTimeout=5000