【springcloud】Ribbon 服务消费带负载均衡搭建

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一、pom.xml

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
	</properties>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.2.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

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

		<!--测试-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>

		<!--dept的pojo类-->
		<dependency>
			<groupId>com.hiteamtech</groupId>
			<artifactId>springcloud-api-dept</artifactId>
			<version>1.0-SNAPSHOT</version>
		</dependency>

		<!--热部署-->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
		</dependency>

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

		<!-- Ribbon相关 -->
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
		</dependency>

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

	</dependencies>

	<!--spring cloud的依赖-->
	<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>

	<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

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

二、application.yml

server:
  port: 80

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

三、开启负载均衡配置类，代码中要添加RestTemplate

添加 @LoadBalanced 注解。

@Configuration
public class ConfigBean {

    @Bean
    @LoadBalanced // 开启负载均衡
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }

}

四、controller

单机版的服务提供者可以用地址进行调用也可以用微服务名调用，推荐用服务名。

@RestController
public class DeptController {

    // private static final String REST_URL_PREFIX = "http://localhost:8001";
    private static final String REST_URL_PREFIX = "http://springcloud-dept";

    @Autowired
    private RestTemplate restTemplate;

    @RequestMapping(value="/consumer/dept/add")
    public boolean add(Dept dept)
    {
        return restTemplate.postForObject(REST_URL_PREFIX+"/dept/add", dept, Boolean.class);
    }

    @RequestMapping(value="/consumer/dept/get/{id}")
    public Dept get(@PathVariable("id") Long id)
    {
        return restTemplate.getForObject(REST_URL_PREFIX+"/dept/get/"+id, Dept.class);
    }

    @SuppressWarnings("unchecked")
    @RequestMapping(value="/consumer/dept/list")
    public List<Dept> list()
    {
        return restTemplate.getForObject(REST_URL_PREFIX+"/dept/list", List.class);
    }

}

五、启动类

@SpringBootApplication
@EnableEurekaClient
public class SpringcloudConsumer80Application {

	public static void main(String[] args) {
		SpringApplication.run(SpringcloudConsumer80Application.class, args);
	}

}

六、搭建多个服务提供者

1. 创建两个新的数据库，添加之前的sql，修改 db_source 字段值分别为 02 和 03。

2. 复制服务提供者项目两份，修改yml中的端口号，修改连接的数据库，修改instance:instance-id

3. 启动所有的服务进行测试，访问服务消费者，然后点击刷新发现访问不同的数据库，也就是访问了不同的服务提供，也就验证了微服务可以连接不同的数据库。
   

4. 目前为止项目列表
   

5. 访问Eureka服务：