微服務之Eureka實作服務注冊中心入門(一)

父類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">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.gyjf.czl</groupId>
    <artifactId>cloud-2020-10</artifactId>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>eureka-registry-01</module>
        <module>eureka-service-consumer</module>
        <module>eureka-service-provider-01</module>
    </modules>
    <packaging>pom</packaging>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.0.1.RELEASE</version>
    </parent>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Finchley.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-dependencies</artifactId>
                <version>2.0.1.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
            <dependency>
                <groupId>com.alibaba.cloud</groupId>
                <artifactId>spring-cloud-alibaba-dependencies</artifactId>
                <version>2.0.2.RELEASE</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>
           

一.服務注冊中心

 pom檔案

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
  </dependencies>
           

 配置檔案

server:
  port: 8080
spring:
  application:
    name: eureka-registry-01
eureka:
  instance:
    hostname: localhost
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
           

 啟動類

@SpringBootApplication
@EnableEurekaServer
public class EurekaRegistry01MainApplication {

    public static void main(String[] args) {
        SpringApplication.run(EurekaRegistry01MainApplication.class, args);
    }
}
           

二.消費端服務

 pom檔案

<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
        </dependency>
    </dependencies>
           

配置檔案

server:
  port: 8081
spring:
  application:
    name: service-consumer
feign :
  hystrix:
    enabled: true
eureka:
  instance:
    hostname: localhost
  client:
    service-url:
      defaultZone: http://localhost:8080/eureka/
           

啟動類

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ServiceConsumerApplication {

    public static void main(String[] args) {
        SpringApplication.run(ServiceConsumerApplication.class, args);
    }
}
           

配置類

@Configuration
public class ApplicationContextConfig {

    @Bean
    @LoadBalanced
    public RestTemplate getRestTemplate() {
        return new RestTemplate();
    }
}
           

Feign

@Component
@FeignClient(value = "service-provider",fallback = ServiceProvider03Fallback.class)
public interface ServiceProvider03Feign {

    @GetMapping("/hello")
    public String hello();
}
           

Fallback

@Component
public class ServiceProvider03Fallback implements ServiceProvider03Feign {
    @Override
    public String hello() {
        return "連接配接斷開";
    }
}
           

TestController

@RestController
public class TestController {

    @Resource
    private ServiceProvider03Feign serviceProvider03Feign;
    
    @GetMapping("/consumer/other")
    public String consumerOther() {
        return serviceProvider03Feign.hello();
    }
}
           

三.生産端服務

pom檔案

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

配置檔案

server:
  port: 8082
spring:
  application:
    name: service-provider
feign :
  hystrix:
    enabled: true
eureka:
  instance:
    hostname: localhost
  client:
    service-url:
      defaultZone: http://localhost:8080/eureka/
           

啟動類

@SpringBootApplication
@EnableDiscoveryClient
@EnableFeignClients
public class ServiceProvider01MainApplication {
    public static void main(String[] args) {
        SpringApplication.run(ServiceProvider01MainApplication.class, args);
    }

}
           

TestController

@RestController
public class TestController {

    @Value("${server.port}")
    private String port;

    @GetMapping("/hello")
    public String hello() {
        return "This message is from server port：" + port;
    }

    public void setPort(String port) {
        this.port = port;
    }
}