环境 springboot + springcloud
Eureka-Server注册中心服务端
pom.xml导入依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
<version>2.2.7.RELEASE</version> <!-- 一般在父工程中就配置了 -->
</dependency>
aplication.yml配置
server:
port: 10086
spring:
application:
name: eurekaserver # 服务名，需要配置
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:10086/eureka
EurekaServerApplication.java启动类配置
@SpringBootApplication
@EnableEurekaServer // 开启eureka的注册中心功能
public class EurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaServerApplication.class, args);
}
}
Service提供者
pom.xml
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.2.7.RELEASE</version> <!-- 一般在父工程中就配置了 -->
</dependency>
application.yml
spring:
application:
name: userservice
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:10086/eureka
consumer消费者 (消费者也可以作为提供者身份出现)
pom.xml
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
<version>2.2.7.RELEASE</version> <!-- 一般在父工程中就配置了 -->
</dependency>
application.yml
spring:
application:
name: orderservice
eureka:
client:
service-url:
defaultZone: http://127.0.0.1:10086/eureka
OrderApplication 配置RestTemplate的Bean加入到Spring容器中
@MapperScan("cn.xxx.order.mapper")
@SpringBootApplication
public class OrderApplication {
public static void main(String[] args) {
SpringApplication.run(OrderApplication.class, args);
}
@Bean
@LoadBalanced # 负责均衡 和 做拉取服务
public RestTemplate getRestTemplate() {
return new RestTemplate();
}
}
OrderService 利用RestTemplate调用 UserService接口
@Service
public class OrderService {
@Autowired
private OrderMapper orderMapper;
@Autowired
private RestTemplate restTemplate;
public Order queryOrderById(Long orderId) {
Order order = orderMapper.findById(orderId);
// restTemplate.getForObject(请求地址, 返回值类型);
String url = "http://userservice/user/" + order.getUserId(); // userservice是提供者的spring.application.name
User user = restTemplate.getForObject(url, User.class);
order.setUser(user);
return order;
}
}
Ribbon负载均衡 (service配置)
方式1：重写IRule接口的实现Bean
@Bean
public IRule randomRule() {
return new RandomRule();
}
方式2：配置文件指定
application.xml文章来源：https://www.toymoban.com/news/detail-693589.html
userservice: # 给某个微服务配置负载均衡规则，这里是userservice服务
ribbon:
NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule # 负载均衡规则
# 当第一次访问时才会拉取服务再做缓存
饥饿加载配置：容器加载完毕后就拉取服务做缓存文章来源地址https://www.toymoban.com/news/detail-693589.html
ribbon:
eager-load:
enabled: true
clients:
- userservice # 指定一启动就加载的服务，可以配置多个
- xxxservice1
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