spring-cloud(一)服务的注册和发现

1.SpringClound特点

Spring Cloud focuses on providing good out of box experience for typical use cases and extensibility mechanism to cover others.

  • Distributed/versioned configuration
  • Service registration and discovery
  • Routing
  • Service-to-service calls
  • Load balancing
  • Circuit Breakers
  • Distributed messaging

2.创建服务注册中心

2.1创建spring-boot工程后再依赖中添加eureka-server依赖
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
</dependencies>
2.2添加工程配置,配置工程为注册中心
server:
port: 8761

eureka:
instance:
hostname: localhost
client:
registerWithEureka: false(表明是服务端)
fetchRegistry: false(表明是服务端)
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

spring:
application:
name: eurka-server
2.3在启动类中添加注册中心的注解

@SpringBootApplication
@EnableEurekaServer()
public class EurekaServerApplication {

public static void main(String[] args) {
SpringApplication.run( EurekaServerApplication.class, args );
}
}
2.4eureka server 是有界面的,启动工程,打开浏览器访问: http://localhost:8761 ,界面如下:

 

3.创建服务注册客户端中心

3.1创建spring-boot工程后再依赖中添加eureka-client依赖
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
</dependencies>
3.2添加工程配置,配置工程为注册中心
server:
port: 8762

spring:
application:
name: service-hi

eureka:
client:
serviceUrl:
defaultZone: http://localhost:8761/eureka/

3.3在启动类中添加注册中心的注解
@SpringBootApplication
@EnableEurekaClient
@RestController
public class ServiceHiApplication {

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

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

    @RequestMapping("/hi")
    public String home(@RequestParam(value = "name", defaultValue = "forezp") String name) {
        return "hi " + name + " ,i am from port:" + port;
    }

}

 


2.4启动工程后发现client已经在server中注册

需要指明spring.application.name,这个很重要,这在以后的服务与服务之间相互调用一般都是根据这个name 。 启动工程,打开http://localhost:8761 ,即eureka server 的网址:

Paste_Image.png

你会发现一个服务已经注册在服务中了,服务名为SERVICE-HI ,端口为7862

这时打开 http://localhost:8762/hi?name=forezp ,你会在浏览器上看到 :

hi forezp,i am from port:8762


posted @ 2018-11-09 17:26  纳木错星空  阅读(215)  评论(0编辑  收藏  举报