springCloud微服务入门

目录

• 前言
• Eureka
  • 注册中心server
    • 新建
    • 配置
  • 服务提供者service
    • 新建
    • 配置
  • 服务消费者controller
    • 新建
    • 配置
    • 使用
• Feign负载均衡

前言

springCloud是一个微服务框架集。
eureka来实现zookeeper；

Eureka

注册中心server

新建

选择版本： 1.5.17
cloud dicovery ---  eureka server

配置

• 启动类

# 启动类添加注解：
@EnableEurekaServer

• 简单配置

# application.yml
server:
  port: 8761
eureka:
  client:
    register-with-eureka: false
    fetch-registry: false
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka/

查看127.0.0.1:8761/

• 集群配置

# application.yml
spring:
  application:
    name: server中心
  profiles:
    active: server1

# application-server1.yml
server:
  port: 8761
eureka:
  instance:
    hostname: server1
  client:
    service-url:
      defaultZone: http://127.0.0.1:8762/eureka/ # 后面可以添加更多地址，用逗号分隔

# application-server2.yml
server:
  port: 8762
eureka:
  instance:
    hostname: server2
  client:
    service-url:
      defaultZone: http://127.0.0.1:8761/eureka/

启动参数

--spring.profiles.active=prod

服务提供者service

新建

和注册中心一样

配置

• 启动类

和注册中心一样

• 简单配置

spring:
  application:
    name: service01
server:
  port: 8081

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/

服务消费者controller

新建

和之前一样

配置

• 启动类

# 添加注解
@EnableDiscoveryClient

# 添加属性
@Bean
@LoadBalanced
public RestTemplate restTemplate() {
    return new RestTemplate();
}

• 配置

spring:
  application:
    name: controller01
server:
  port: 8764
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/ 

使用

@RestController
public class TestController {

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("test")
    public String test() {
        String forObject = restTemplate.getForObject("http://service01/test", String.class);
        return forObject;
    }
}

Feign负载均衡

• 引用

<dependency>
   	<groupId>org.springframework.cloud</groupId>
  	<artifactId>spring-cloud-starter-feign</artifactId>
</dependency>

• 启动类

@EnableFeignClients
@EnableDiscoveryClient

• service层接口

@FeignClient(value = "springcloud-server")
public interface TestService {
 
   @RequestMapping("/test")
   public String test();
 
}

• controller调用

@RestController
public class TestController {
 
   @Autowired
   private  TestService testService;
 
   @RequestMapping(value = "/test",method = RequestMethod.GET)
   public String test(){
      return  testService.test();
   }
}