分为3个项目来讲解: 注册中心,provider,consumer
注册中心
注册中心pom.xml添加:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
再添加(注意这个version
目前是Hoxton.SR1
,以后升级了可能会变):
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Hoxton.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
application.yml
server:
port: 8761
eureka:
instance:
hostname: eureka-server #eureka实例的主机名
client:
register-with-eureka: false #不注册本身到Eureka注册中心
fetch-registry: false #不从Eureka注册中心获取服务的注册信息
service-url:
defaultZone: http://localhost:8761/eureka/
EurekaSpringBootApplication代码:
@EnableEurekaServer//启用Eureka服务
@SpringBootApplication
public class EurekaSpringBootApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaSpringBootApplication.class, args);
}
}
启动项目,访问:http://localhost:8761/
即可看到注册中心页面。
provider项目
除了注册中心刚才添加的,pom.xml额外添加:
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
application.yml代码:
#启动端口
server:
port: 8001
#项目名称
spring:
application:
name: provider
#eureka配置
eureka:
instance:
prefer-ip-address: true #使用服务的id地址注册
client:
service-url:
defaultZone: http://localhost:8761/eureka/
ProviderSpringBootApplication代码:
@EnableEurekaServer//启用Eureka服务
@SpringBootApplication
public class ProviderSpringBootApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderSpringBootApplication.class, args);
}
}
TicketService代码:
@Service
public class TicketService {
public String getTicket(){
return "动车票";
}
}
TicketController代码:
@RestController
public class TicketController {
@Autowired
TicketService ticketService;
@GetMapping("/ticket")
public String getTicket(){
return ticketService.getTicket();
}
}
启动项目。
consumer
pom.xml参照刚才server和client都要。
application.yml代码:
server:
port: 8002
spring:
application:
name: consumer
eureka:
instance:
prefer-ip-address: true #使用服务的id地址注册
client:
service-url:
defaultZone: http://localhost:8761/eureka/
ConsumerSpringBootApplication代码:
@EnableEurekaServer//启用Eureka服务
@SpringBootApplication
public class ConsumerSpringBootApplication {
@Bean
@LoadBalanced//启用负载均衡机制
public RestTemplate restTemplate(){
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(ConsumerSpringBootApplication.class, args);
}
}
UserController代码:
@RestController
public class UserController {
@Autowired
RestTemplate restTemplate;
@GetMapping("/buy")
public String buyTicket(String name){
String template = restTemplate.getForObject("http://PROVIDER/ticket", String.class);
return name+"购买了"+template;
}
}
启动项目。
效果
注册中心如图(8001是provider,8002是consumer):
浏览器输入: http://localhost:8002/buy?name=zhangsan
返回: zhangsan购买了 动车票
该项目git地址为:
https://github.com/1054294965/boot-eureka