SpringCloud 可以說是一門非常熱門的技術，依賴於SpringBoot進行實現。cloud就像一個大管家，而SpringBoot 纔是真正幹活的人。且SpringBoot可以獨自運行，不依賴於SpringCloud。本篇主要介紹SpringCloud中五大神獸裏的兩大神獸，eureka和rabbin，其中eureka 是重點，而rabbin只是簡單使用了它的一個註解。
0，工程結構圖
1，eureka 配置
①，pom.xml
-
<parent> -
<groupId>org.springframework.boot</groupId> -
<artifactId>spring-boot-starter-parent</artifactId> -
<version>1.5.12.RELEASE</version> -
</parent> -
<properties> -
<spring-cloud.version>Edgware.SR3</spring-cloud.version> -
</properties> -
<dependencies> -
<dependency> -
<groupId>org.springframework.cloud</groupId> -
<artifactId>spring-cloud-starter-eureka-server</artifactId> -
</dependency> -
</dependencies> -
<dependencyManagement> -
<dependencies> -
<dependency> -
<groupId>org.springframework.cloud</groupId> -
<artifactId>spring-cloud-dependencies</artifactId> -
<version>${spring-cloud.version}</version> -
<type>pom</type> -
<scope>import</scope> -
</dependency> -
</dependencies> -
</dependencyManagement>
②，application.properties
-
#eueka 主機名 -
eureka.instance.hostname=eureka-service -
#不註冊自己 -
eureka.client.register-with-eureka=false -
#獲取服務 -
eureka.client.fetch-registry=false -
#提供者和消費者的註冊地址 -
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/ -
server.port=8761
③，啓用註冊中心
-
import org.springframework.boot.SpringApplication; -
import org.springframework.boot.autoconfigure.SpringBootApplication; -
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer; -
//啓用註冊中心 -
@EnableEurekaServer -
@SpringBootApplication -
public class EurekaApplication { -
public static void main(String[] args) { -
SpringApplication.run(EurekaApplication.class, args); -
} -
}
2，provider配置
①，pom.xml
-
<parent> -
<groupId>org.springframework.boot</groupId> -
<artifactId>spring-boot-starter-parent</artifactId> -
<version>1.5.12.RELEASE</version> -
</parent> -
<properties> -
<spring-cloud.version>Edgware.SR3</spring-cloud.version> -
</properties> -
<dependencies> -
<dependency> -
<groupId>org.springframework.cloud</groupId> -
<artifactId>spring-cloud-starter-eureka</artifactId> -
</dependency> -
<dependency> -
<groupId>org.springframework.boot</groupId> -
<artifactId>spring-boot-starter-web</artifactId> -
</dependency> -
</dependencies> -
<dependencyManagement> -
<dependencies> -
<dependency> -
<groupId>org.springframework.cloud</groupId> -
<artifactId>spring-cloud-dependencies</artifactId> -
<version>${spring-cloud.version}</version> -
<type>pom</type> -
<scope>import</scope> -
</dependency> -
</dependencies> -
</dependencyManagement>
②，application.properties
-
server.port=8002 -
#服務名 -
spring.application.name=ticket-provider -
#使用ip進行註冊 -
eureka.instance.prefer-ip-address=true -
#註冊地址 -
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
③，定義服務
-
import org.springframework.stereotype.Service; -
@Service -
public class TicketService { -
public String buyTicket(){ -
System.out.println("我是8002"); -
return "《瘋狂的石頭》"; -
} -
}
④，提供服務
-
import com.example.provider.service.TicketService; -
import org.springframework.beans.factory.annotation.Autowired; -
import org.springframework.web.bind.annotation.RequestMapping; -
import org.springframework.web.bind.annotation.RestController; -
@RestController -
public class TicketController { -
@Autowired -
private TicketService ticketService; -
@RequestMapping("/") -
public String index(){ -
return ticketService.buyTicket(); -
} -
}
3，customer配置
①，pom.xml
-
<parent> -
<groupId>org.springframework.boot</groupId> -
<artifactId>spring-boot-starter-parent</artifactId> -
<version>1.5.12.RELEASE</version> -
</parent> -
<properties> -
<spring-cloud.version>Edgware.SR3</spring-cloud.version> -
</properties> -
<dependencies> -
<dependency> -
<groupId>org.springframework.cloud</groupId> -
<artifactId>spring-cloud-starter-eureka</artifactId> -
</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.properties
-
server.port=8200 -
spring.application.name=ticket-customer -
eureka.instance.prefer-ip-address=true -
#註冊地址 -
eureka.client.service-url.defaultZone=http://localhost:8761/eureka/
③，消費者配置
-
import org.springframework.boot.SpringApplication; -
import org.springframework.boot.autoconfigure.SpringBootApplication; -
import org.springframework.cloud.client.discovery.EnableDiscoveryClient; -
import org.springframework.cloud.client.loadbalancer.LoadBalanced; -
import org.springframework.context.annotation.Bean; -
import org.springframework.web.client.RestTemplate; -
//開啓發現服務 -
@EnableDiscoveryClient -
@SpringBootApplication -
public class CustomerApplication { -
public static void main(String[] args) { -
SpringApplication.run(CustomerApplication.class, args); -
} -
// 啓用負載均衡，默認算法是輪詢 -
@LoadBalanced -
@Bean -
public RestTemplate restTemplate(){ -
return new RestTemplate(); -
} -
}
④，消費者消費方法
-
import org.springframework.beans.factory.annotation.Autowired; -
import org.springframework.web.bind.annotation.RequestMapping; -
import org.springframework.web.bind.annotation.RestController; -
import org.springframework.web.client.RestTemplate; -
@RestController -
public class CustomerController { -
@Autowired -
private RestTemplate restTemplate; -
@RequestMapping("/") -
public String index(){ -
String result = restTemplate.getForObject("http://ticket-provider/", String.class); -
return result; -
} -
}
4，測試
①，啓動eureka工程
②，啓動提供者工程
③，啓動消費者工程
④，最後會看到消費者和提供者都註冊到了eureka中，並可以通過，消費接口訪問服務者提供的服務，
並且使用了輪詢的負載均衡策略