SpringCloud入门 1.Eureka Server安装 2.基础跨进程调用

1.Eureka Server安装

新建项目，选择Eureka Server组件

在resource文件夹下新建application-8001.properties

spring.application.name=ek
server.port=8001

#Eureka Server 实例名
eureka.instance.hostname=ek1.cn
#Eureka Server 是否把自己注册到Eureka Server
eureka.client.register-with-eureka=true
#表示是否从Eureka Server获取注册的服务信息
eureka.client.fetch-registry=true
#eureka-server所有实例
#eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/
eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/
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在resource文件夹下新建application-8002.properties

spring.application.name=ek
server.port=8002

#Eureka Server 实例名
eureka.instance.hostname=ek2.cn
#Eureka Server 是否把自己注册到Eureka Server
eureka.client.register-with-eureka=true
#表示是否从Eureka Server获取注册的服务信息
eureka.client.fetch-registry=true
#eureka-server所有实例
eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/

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启动类加上@EnableEurekaServer注解可以将项目作为SpringCloud中的注册中心

package com.example;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@EnableEurekaServer
@SpringBootApplication
public class App {

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

}

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2.跨进程调用

1.建立a应用，pom文件如下

  <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
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2.application.properties

server.port = 9091
spring.application.name = a
eureka.instance.ip-address = 192.168.14.13
eureka.instance.instance-id = ${eureka.instance.ip-address}:${server.port}
eureka.instance.hostname =  ${eureka.instance.ip-address}
#eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/,http://ek2.cn:8002/eureka/
eureka.client.service-url.defaultZone=http://ek1.cn:8001/eureka/

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3.启动项目，即可查看服务注册成功

4.新建项目b，pom.xml 文件如下

<dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
      
    </dependencies>
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5.启动了添加@EnableDiscoveryClient注解

@SpringBootApplication
@EnableDiscoveryClient
public class App {

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

}
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6. 注册RestTemplate，代码如下

@Configuration
public class RestTemplateConfig {

    @Bean
    @LoadBalanced
    public RestTemplate restTemplate(){
        return  new RestTemplate();
    }
}


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7. 调用a服务对应接口

 @Resource
    private RestTemplate restTemplate;

    @GetMapping("/test")
    public  String  test(){

     String ret = restTemplate.getForObject("http://a/echo?name=苍老师", String.class);
  
        return ret;
    }

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