Spring Cloud Eureka: “In-depth understanding of Eureka”
Spring Cloud Ribbon: “In-depth understanding of Ribbon”
Spring Cloud Hystrix: “In-depth understanding of Hystrix”
Spring Cloud Zuul: “In-depth understanding of Zuul”
Spring Cloud Config: “In-depth understanding of Config”
Figure 1 Flowchart of Spring Cloud Netflix
1. Introduce Spring Cloud Netflix parent dependency
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Greenwich.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<dependency>
<groupId>com.google.code.gson</groupId>
<artifactId>gson</artifactId>
<version>2.8.5</version>
</dependency>
</dependencies>
</dependencyManagement>
2. Build Eureka cluster
1 introduce Eureka-Server dependency
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
</dependencies>
2 Write cluster Eureka-Server configuration file
2.1 The first Eureka-Server configuration file
server:
port: 8000
spring:
application:
name: Eureka-Server-8000
eureka:
instance:
hostname: localhost
client:
service-url:
defaultZone: http://localhost:8001/eureka/ # Registration address
2.2 The second Eureka-Server configuration file
server:
port: 8001
spring:
application:
name: Eureka-Server-8001
eureka:
instance:
hostname: localhost
client:
service-url:
defaultZone: http://localhost:8000/eureka/ # Registration dependencies
3 Write cluster Eureka-Server startup class
3.1 The first Eureka-Server startup class
@SpringBootApplication
@EnableEurekaServer
public class EurekaServer8001 {
public static void main(String[] args) {
SpringApplication.run(EurekaServer8001.class, args);
}
}
3.2 The second Eureka-Server startup class
@SpringBootApplication
@EnableEurekaServer
public class EurekaServer8000 {
public static void main(String[] args) {
SpringApplication.run(EurekaServer8000.class, args);
}
}
4 registration results
Figure 2 Eureka-Server-8000 service registration result map
Figure 3 The registration result map of Eureka-Server-8001
3. Create a service call public module (Common)
Import interface template TestService
public interface TestService {
String testFeign();
}
4. Build a service provider cluster
1 Import dependencies
<dependencies>
<!--Eureka server dependency-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<version>2.1.0.RELEASE</version>
</dependency>
<dependency>
<groupId>com.lidantao</groupId>
<artifactId>Netflix-Common</artifactId>
<version>1.0</version>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
</dependency>
</dependencies>
2 Write Provider cluster configuration file
2.1 The first Provider configuration file
server:
port: 7000
spring:
application:
name: Provider
eureka:
client:
service-url:
defaultZone: http://localhost:8000/eureka/
2.2 The second Provider configuration file
server:
port: 7001
spring:
application:
name: Provider
eureka:
client:
service-url:
defaultZone: http://localhost:8000/eureka/
3 Implement remote service call interface
3.1 Provider-7000 implementation code
@Service
public class TestServiceImpl implements TestService {
@Override
public String testFeign() {
return "Provider-7000-testFeign";
}
}
3.2 Provider-7001 implementation code
@Component
public class TestServiceImpl implements TestService {
@Override
public String testFeign() {
return "Provider-7001-testFeign";
}
}
4 Write service Controller interface
4.1 Controller class of the first Provider
@RestController
public class TestController {
@Autowired
private TestService testService;
@RequestMapping("/testFeign")
public String testFeign(){
return testService. testFeign();
}
}
4.2 The Controller class of the second Provider
@RestController
public class TestController {
@Autowired
private TestService testService;
@RequestMapping("/testFeign")
public String testFeign(){
return testService. testFeign();
}
}
5. Build a service consumer module
1 Controller
@RestController
@RequestMapping("/consumer")
public class TestController {
@Autowired
private TestService testService;
@RequestMapping("/testFeign")
public String getTest(){
return testService. testFeign();
}
}
2 Service
@Component
@FeignClient("Provider")
public interface TestService{
@GetMapping("/testFeign")
@LoadBalanced
String testFeign();
}
3 Realize client load balancing
@Configuration
public class CustomRibbonConfig {
@Bean
public IRule iRule(){
return new RoundRobinRule();
}
}
4 startup class
@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
@RibbonClient(name = "service", configuration = CustomRibbonConfig. class)
public class NetflixConsumer6001 {
public static void main(String[] args) {
SpringApplication.run(NetflixConsumer6001.class, args);
}
}
5 client load balancing results
Figure 4 Provider-7000 provides results
Figure 5 Provider-7001 provides results
6. Build the gateway module
1 Write configuration file
server:
port: 9000
spring:
application:
name: Netflix-Zuul-9000
eureka:
client:
service-url:
defaultZone: http://localhost:8000/eureka/
zuul:
routes:
mydept.service-id: Consumer-6001 # Forward to this service
mydept.path: /**
2 Write startup class
@SpringBootApplication
@EnableDiscoveryClient
@EnableZuulProxy
public class NetflixZuul9000 {
public static void main(String[] args) {
SpringApplication.run(NetflixZuul9000.class, args);
}
}
3 Forward the result to the client through the gateway
Figure 6 Accessing consumers through the gateway
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