OpenFegin服务接口调用

先来介绍一下OpenFegin吧！！！

官网的解释：

 Feignn和OpenFeign两者的区别：

新建一个cloud-consumer-feign-order80模块

pom

    
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
 
        
            org.springframework.boot
            spring-boot-starter-web
        

        
            org.springframework.boot
            spring-boot-starter-actuator
        

        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
        

        
            com.alibaba
            druid-spring-boot-starter
            1.1.10
        

        
            mysql
            mysql-connector-java
        

        
            org.springframework.boot
            spring-boot-starter-jdbc
        

        
            org.springframework.boot
            spring-boot-devtools
            runtime
            true
        

        
            org.projectlombok
            lombok
            true
        

        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            com.atgugui.springcloud
            cloud-api-commons
            ${project.version}
        

        

        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-client
            2.2.7.RELEASE

        


    

 yml

server:
  port: 80
eureka:
  client:
    register-with-eureka: true
    service-url:
      defaultZone: http://eureka7001.com:7001/eureka, http://eureka7002.com:7002/eureka
 

主启动类

@SpringBootApplication
@EnableFeignClients
public class OrderFeignMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderFeignMain80.class,args);
    }
}

业务逻辑接口+@FeignClient配置provider服务

业务接口

@Component
@FeignClient(value = "CLOUD-PAYMENT-SERVICE")
public interface PaymentFeignService {

    @GetMapping(value = "/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id);
}
 
 

控制层：

@RestController
public class OrderFeignController {

    @Resource
    private PaymentFeignService paymentFeignService;

    @GetMapping(value = "/consumer/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id){
       return paymentFeignService.getPaymentById(id);
    }
}
 
 

测试！！！

启动微服务 然后访问localhost/consumer/payment/get/31就能看到效果啦！！！

说明一下：

（OpenFigin自带负载均衡配置项）

做个小总结吧

超时设置，故意设置超时演示出错情况：

服务方故意写暂停程序：

@GetMapping(value = "/payment/feign/timeout")
public String paymentFeignTimeout(){
    try { TimeUnit.SECONDS.sleep(3); }catch (Exception e) {e.printStackTrace();}
    return serverPort;
}
 

消费方80添加超时方法：

service：

@GetMapping(value = "/payment/feign/timeout")
public String paymentFeignTimeout();
 

controller：

@GetMapping(value = "/consumer/payment/feign/timeout")
public String paymentFeignTimeout(){
   return paymentFeignService.paymentFeignTimeout();
}
 

测试访问  localhost/consumer/payment/feign/timeout

效果：出现错误页面

为什么会出现报错页面呢？

因为OpenFeign默认等待时间是1s，超过这个时间就会报错！！！ 

那么如何更改等待时间呢？请看如下操作：

在YML文件开启OpenFeign客户端超时控制（自定义等待时长） 

再次访问  localhost/consumer/payment/feign/timeout

发现可以正常显示内容！！！

 日志级别：

 配置Bean

@Configuration
public class FeignConfig {
   @Bean
    Logger.Level feignLoggerLevel(){
       return Logger.Level.FULL;
   }
}

yml文件里需要开启日志的Feign客户端

logging:
  level:
    com.atguigu.springcloud.service.PaymentFeignService: debug
 

最后启动访问，就能看到后台的日志啦！！！