简单明了让你搭建并初识SpringCloud项目(通俗易懂)

喜欢ヅ旅行 2023-05-29 05:18 9阅读 0赞

## 1.先创建个空的maven项目 ##

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## 2.创建eureka服务 ##

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## idea自动生成的pom配置文件需要更改一下 ##

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启动eureka注册中心的方式很简单，在springboot的启动类上加上注解  
@EnableEurekaServer  
将resource下面的 application.properties文件改为application.yml文件并添加如下配置：

server:
      port: 8801
    
    eureka:
      instance:
        hostname: localhost
      client:
        registerWithEureka: false
        fetchRegistry: false
        serviceUrl:
          defaultZone: http://${ eureka.instance.hostname}:${ server.port}/eureka/

## 启动项目访问localhost:8801，看到这个界面，Eureka注册中心就已经启动成功，接下来我们可以编写一个提供者，一个消费者。 ##

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## 2.创建提供者ribbon ##

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创建模块和上个一样,到这里变化一下,  
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同样的修改pom, 注意  
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加上 @ComponentScan 注解，然后添加 @EnableDiscoveryClient 注册服务，然后注入RestTemplate对象，  
@LoadBalanced 表示开启负载均衡  
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@Bean
        @Autowired
        @LoadBalanced
        RestTemplate restTemplate(){ 
            return new RestTemplate();
        }

编写controller  
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controller代码

@RestController
    public class HelloController { 
    
        @Autowired
        private HelloService helloService;
    
        @GetMapping("/hello")
        public String hello(){ 
            String hello = helloService.sayHello();
            return hello;
        }
    
    }

service代码

@Service
    public class HelloService { 
        public String sayHello(){ 
            return "helloWorld"; // 提供一个hello World
        }
    }

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配置文件

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8801/eureka/
    server:
      port: 8802
    spring:
      application:
        name: ribbon-provider

## 之后启动服务，启动后访问 localhost:8802/hello ##

看到这里,就启动成功了  
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## 你在访问localhost:8801,就可以看到我们服务已经注册好了一个 ##

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## 3.再创建一个ribbon2服务 ##

可以看下之前怎么创建的,  
只需更改一下service 的部分代码就行  
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还有配置文件

eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8801/eureka/
    server:
      port: 8803
    spring:
      application:
        name: ribbon-provider

启动服务,访问http://127.0.0.1:8803/hello 看到这就成功了  
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此时我们的eureka已经有2个相同的服务了,  
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## 4.创建消费者feign ##

feign消费是通过注解的方式进行的消费模式，它默认打开了负载均衡，还是在cloudDemo下创建一个module，名字叫feign：  
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## 修改一下依赖 ##

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可以复制之前controller和service,再创建一个rpc文件夹  
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@FeignClient("ribbon-provider")
        public interface GetHello { 
            @GetMapping(value = "/hello")
            public String sayHello();
        }

同样的修改配置文件  
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eureka:
      client:
        serviceUrl:
          defaultZone: http://localhost:8801/eureka/
    server:
      port: 8804
    spring:
      application:
        name: feign-consumer

启动类加上注解  
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@EnableDiscoveryClient //用于注册和发现服务  
@EnableFeignClients

## 5.测试服务(负载均衡) ##

不停的访问http://127.0.0.1:8804/hello  
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我们的cloud服务就成功了

## eureka: 注册服务与发现 ##

## ribbon: 提供服务 ##

## feign : 消费者 ##

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