9. Openfeign service interface call

Study B Standing still, Mr. Zhou Yang of Silicon Valley SpringCloud The lecture notes

1. summary

1.1 OpenFeign What is it? ？

Feign It's a declarative one web Service client , Let's write web Service clients become very easy , Just create an interface and annotate it

GitHub：https://github.com/spring-cloud/spring-cloud-openfeign

1.2 What can I do?

1.3Feign and OpenFeign Difference between them

2.OpenFeign Use steps

2.1 newly build cloud-consumer-feign-order80

Feign Use... On the consumer side
Interface + annotation Microservice invocation interface [email protected]

2.2 Change pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>cloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-consumer-feign-order80</artifactId>

    <!--openfeign-->
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-common</artifactId>
            <version>${project.version}</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
</project>

2.3 Change yml

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

2.4 Main startup class annotation @EnableFeignClients

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

2.5 Business class

Business logic interface [email protected] Configuration call provider service

newly build PaymentFeignService Interface and add comments @FeignClient

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

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

@RestController
public class OrderFeignController {
    

    @Resource
    private PaymentFeignService paymentFeignService;

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

2.6 test

Start... First 2 individual eureka colony 7001/7002, Restart 2 Micro services 8001/8002, start-up OpenFeign start-up

http://localhost/consumer/payment/get/3

Feign Load balancing item with its own configuration

summary ：

3.OpenFeign Timeout control and log printing function

3.1 Timeout control

OpenFeign By default, wait one second , Report error after exceeding

OpenFeign The default support Ribbon

YML The file needs to be opened OpenFeign Client timeout control , namely ribbon Timeout control for

ribbon:
  ReadTimeout:  5000 #  The time it takes to read available resources from the server after the connection is established 
  ConnectTimeout: 5000 # The time it takes to establish a connection , It is suitable for normal network conditions , The time taken to connect the two ends 

3.2 Log printing

The level of logging ：

Write configuration class

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

Change yml

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

Background view