Spring Cloud Eureka 服务发现与消费

一、服务注册中心部署和服务提供方部署参考“Spring Cloud Eureka 部署高可用注册中心”https://blog.csdn.net/lixiaxin200319/article/details/80867425

       spring.application.name=hello-service
       eureka.client.serviceUrl.defaultZone=http://localhost:1112/eureka/,http://localhost:1111/eureka/
     eureka.client.registry-fetch-interval-seconds=5

server.port=8090

使用 JAVA 命令启动 JAR 包。

二、部署服务消费者

1.创建名为 ribbon-consumer 的 maven 工程。

2. pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>

	<groupId>com.example</groupId>
	<artifactId>ribbon-consumer</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>ribbon-consumer</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.13.RELEASE</version>  <!-- sprong boot 版本不能高于 1.5.13 否则会与spring-cloud-starter-eureka 1.4.4 版本不兼容 -->
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	
	

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
	</properties>

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

		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-test</artifactId>
			<scope>test</scope>
		</dependency>
		<!--  
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-actuator</artifactId>
		</dependency>
		-->
		 

		 
		<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
            <version>1.4.4.RELEASE</version>
        </dependency> 
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>1.4.4.RELEASE</version>
       </dependency>
        	
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
			<!--  <version>${log4j.version}</version>  -->
		</dependency>
		
	 
	<dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-annotations</artifactId>
       <version>2.9.6</version>
    </dependency>
    
    <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-core</artifactId>
       <version>2.9.6</version>
    </dependency>
    
    <dependency>
       <groupId>com.fasterxml.jackson.core</groupId>
       <artifactId>jackson-databind</artifactId>
       <version>2.9.6</version>
    </dependency>

    <!--  
	<dependency>
       <groupId>org.springframework.boot</groupId>
       <artifactId>spring-boot-starter-tomcat</artifactId>
    </dependency>
    -->
    
	</dependencies>
	
	<dependencyManagement>
	   <dependencies>
	      <dependency>
	         <groupId>org.springframework.cloud</groupId>
	         <artifactId>spring-cloud-dependencies</artifactId>
	         <version>Brixton.SR5</version>
	         <type>pom</type>
	         <scope>import</scope>
	      </dependency>
	   </dependencies>
	</dependencyManagement>  
	

	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>


</project>

src/main/resources/application.properties:

spring.application.name=ribbon-consumer
eureka.client.serviceUrl.defaultZone=http://localhost:1112/eureka/,http://localhost:1111/eureka/
eureka.client.registry-fetch-interval-seconds=5
server.port=9000

eureka.client.serviceUrl.defaultZone=http://localhost:1112/eureka/,http://localhost:1111/eureka/。配置服务消费者向localhost:1112 的注册节点注册，当localhost:1112 节点故障后，再向 localhost:1111 的节点注册。

ConsumerApplication：

package com.example.server1;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;

@EnableDiscoveryClient
@SpringBootApplication

public class ConsumerApplication {
	@Bean
	@LoadBalanced
	RestTemplate restTemplate() {
		return new RestTemplate();
	}
	
	public static void main(String[] args) {
		SpringApplication.run(ConsumerApplication.class,args);
	}
}

创建应用主类 ConsumerApplication，通过 @EnableDiscoveryClient 注解让该应用注册为 Eureka 客户端应用，以获得服务发现的能力。同时，使用 @Bean 在 restTemplate 方法为该主类创建 RestTemplate 的 Spring Bean 实例，并通过 @LoadBalanced 注解开启客户端负载均衡。

ConsumerController:

package com.example.server1;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class ConsumerController {
    @Autowired
    RestTemplate restTemplate;
    
    @RequestMapping(value="/ribbon-consumer",method=RequestMethod.GET)
    public String helloConsumber() {
        return restTemplate.getForEntity("http://hello-service/hello", String.class).getBody();
    }
    
}

创建 ConsumerController 类并实现 /ribbon-consumer 接口。在该接口中，通过在上面创建的 RestTemplate Spring Bean 来实现对 hello-service 服务提供的 /hello 接口进行调用。可以看到这里访问的地址是服务名 hello-service ，而不是一个具体的地址。当多次访问 /ribbon-consumer 接口时，会轮询访问服务名为 hello-service 服务的不同节点。

在 Eclipse 中启动 HellApplication，通过 http://localhost:9000/hello 访问服务消费者，会在浏览器中打印出 HellWord。

Spring Cloud Eureka 服务发现与消费

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