SpringCloud（一）

创建一个项目

1.导入依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
  </parent>

<!--eureka依赖-->
  <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
  </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
  </dependencies>

<dependencyManagement>
<dependencies>
  <!--springCloud依赖-->
  <dependency>
    <groupId>org.springframework.cloud</groupId>
    <artifactId>spring-cloud-dependencies</artifactId>
    <version>Greenwich.RELEASE</version>
    <type>pom</type>
    <scope>import</scope>
  </dependency>
</dependencies>
</dependencyManagement>

2.创建application.yml文件

##声明端口号
server:
  port: 8888
##配置eureka
eureka:
  client:
##代表是否将自己注册到注册中心去
    register-with-eureka: false
##表明自己是注册中心
    fetch-registry: false
##配置地址
    service-url:
      defaultZone: http://localhost:8888/eureka

3.启动类

@SpringBootApplication
@EnableEurekaServer
public class EurekaServer {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer.class, args);
    }
}

访问结果

 生产者和消费者

生产者项目

1.导入依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
  </parent>

<!--eureka依赖-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
</dependencies>

<dependencyManagement>
<dependencies>
    <!--springCloud依赖-->
    <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Greenwich.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
    </dependency>
</dependencies>
</dependencyManagement>

2.创建application.yml文件

##配置应用名称
spring:
  application:
    name: eu_provider
##声明端口号
server:
  port: 8891
##配置eureka
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8888/eureka

3.service接口

public interface IDoService {
    public String doSome();
}

4.service实现类

@RestController
public class IDoServiceImpl implements IDoService {
@RequestMapping("/doSome")
    @Override
    public String doSome() {
        System.out.println("服务提供者");
        return "eureka";
    }
}

启动类

@SpringBootApplication
@EnableEurekaClient
public class EurekaServer {
    public static void main(String[] args) {
        SpringApplication.run(EurekaServer.class, args);
    }
}

访问结果

 消费者项目

1.导入依赖

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.1.4.RELEASE</version>
  </parent>

 <!--eureka依赖-->
    <dependency>
      <groupId>org.springframework.cloud</groupId>
      <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
    </dependency>

    <dependency>
      <groupId>org.springframework.boot</groupId>
      <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

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

  </dependencies>

  <dependencyManagement>
    <dependencies>
      <!--springCloud依赖-->
      <dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-dependencies</artifactId>
        <version>Greenwich.RELEASE</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>

2.创建application.yml文件

##配置应用名称
spring:
  application:
    name: eu_consumer
##声明端口号
server:
  port: 8895
##配置eureka
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8888/eureka

3，创建Controller

@RestController
public class ConsumerController {
    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/doSome")
    public String doSome(){
        System.out.println("ConsumerController");
        return restTemplate.getForObject("http://localhost:8891/doSome",String.class);
    }
}

启动类

@SpringBootApplication
@EnableEurekaClient
/*@EnableFeignClients*/
public class StaConsumer {
    public static void main(String[] args) {
        SpringApplication.run(StaConsumer.class, args);
    }

    @Bean
    /*@LoadBalanced   //实现负载均衡*/
    RestTemplate restTemplate(){
        return new RestTemplate();
    }

    //指定负载均衡策略
    @Bean
    public IRule ribbonRule(){
        return new RandomRule();
    }

}

访问结果

 

 负载均衡

@RestController
public class ConsumerController {
    @Resource
    private RestTemplate restTemplate;

    @RequestMapping("/doSome")
    public String doSome(){
        System.out.println("ConsumerController");
        return restTemplate.getForObject("http://eu_provider/doSome",String.class);
    }
}

 Feign负载均衡策略

1.引入依赖

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

　　2.创建service层

@FeignClient("eu_provider")
public interface IDoService {
    @RequestMapping("/doSome")
    public String doSome();
}

　　3.编写controller

@RestController
public class ConsumerController {
@RestController
public class ConsumerController {
   /* @Resource
    private RestTemplate restTemplate;*/
    @Resource
    private IDoSomeService iDoSomeService;
@RequestMapping("/doSome")
    public String doSome(){
        System.out.println("消费者");
        return iDoSomeService.doSome();
    }
}