Spring Cloud (two) configuration Eureka Client

The foregoing review:

Spring Cloud (a) Eureka Server- monomer and Cluster Setup

In this section we will create two Eureka Client, registered on the section of Eureka Server, one as a service provider, a service as the caller.

A. Service provider (producer)

Add depend in 1.pom

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/>
    </parent>
​
    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>
    </properties>
​
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>
​
    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

2.Application startup class annotate

• @EuableDiscoveryClient: auto-discovery is a client implementation

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

3. Profiles

spring.application.name=spring-cloud-producer
server.port=9000
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/

4. Provide Services

@RestController
public class HelloController {
​
    @RequestMapping("/hello")
    public String index(@RequestParam String name) {
        return "hello " + name + "，welcome to Spring Cloud";
    }
}

II. Caller to the service (consumer)

Add depend in 1.pom

 <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.1.3.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.yfy</groupId>
    <artifactId>consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>consumer</name>
    <description>Demo project for Spring Boot</description>
​
    <properties>
        <java.version>1.8</java.version>
    </properties>
​
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.1.0.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

2.Application startup class annotate

• @EnableDiscoveryClient : Enable service registration and discovery

• @EnableFeignClients: Enable feign remote calls

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

3. Profiles

spring.application.name=spring-cloud-consumer
server.port=9001
eureka.client.serviceUrl.defaultZone=http://localhost:8000/eureka/
feign.hystrix.enabled=true

4.Feign call implementation

@FeignClient(name= "spring-cloud-producer",fallback = HelloRemoteHystrix.class)
public interface HelloRemote {
​
    @RequestMapping(value = "/hello")
    String hello(@RequestParam(value = "name") String name);
}

5.web layer calls a remote service

@RestController
public class HelloController {

    @Autowired
    HelloRemote helloremote;

    @RequestMapping("/hello/{name}")
    public String index(@PathVariable("name") String name) {
        return helloremote.hello(name);
    }
}

III. Test

Start turn spring-cloud-eureka, spring-cloud-producer, spring-cloud-consumer three projects

Browser, type:http://localhost:9001/hello/yfy

return:hello yfy，welcome to Spring Cloud

4. Load balancing test

The controller method modifies producer

@RestController
public class HelloController {

    @RequestMapping("/hello")
    public String index(@RequestParam String name) {
        return "hello " + name + "，welcome to Spring Cloud:product2";
    }
}

Then start a producer, port 9003

 

Browser, type:http://localhost:9001/hello/yfy

First Returns:hello yfy，welcome to Spring Cloud

The first return: `hello yfy, welcome to Spring Cloud: product2

Continue to carry out tests to go find two results appear alternately, that the two service centers automatically provides the functionality of load balancing services.