1、什么情况不需要Eureka服务端，脱离它，直接访问微服务端集群？

？？？

2、application.yml中关闭Eureka功能

配置文件中没有eureka的zoneDefaultUrl，关闭eureka功能

server:
  port: 80

ribbon:
  eureka:
    enabled: false
  
dept-8001:
  ribbon:
    listOfServers: http://dept-8001.com:8001,http://dept-8002.com:8002,http://dept-8003.com:8003

3、RestConfig中的注解@LoadBalanced去掉

package com.zemel.consumer.config;

import java.nio.charset.Charset;
import java.util.Base64;

import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpHeaders;
import org.springframework.web.client.RestTemplate;

@Configuration
public class RestConfig {
	
	@Bean
	public HttpHeaders getHeaders(){
		// 进行一个Http头信息配置
		HttpHeaders headers = new HttpHeaders();
		String auth = "wendy:wendy";
		byte[] encodedAuth = Base64.getEncoder().encode(auth.getBytes(Charset.forName("US-ASCII")));
		// 加密字符串要有空格
		String authHeader = "Basic " + new String(encodedAuth);
		
		headers.set("Authorization", authHeader);
		return headers;
	}

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

}

4、MyBalanceConfig.java

package com.zemel.common;

import org.springframework.context.annotation.Bean;

import com.netflix.loadbalancer.IRule;

// 该类无法被主main扫描到
public class MyLoadBalanceConfig {

	@Bean
	public IRule ribbonRule(){
		
		return new com.netflix.loadbalancer.RandomRule();
	}
}

5、Main启动类

package com.zemel.consumer;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

/**
 * Hello world!
 *
 */
@SpringBootApplication
public class ConsumerRibbonApp {
	public static void main(String[] args) {
		SpringApplication.run(ConsumerRibbonApp.class, args);
	}
	
	
}

6、控制器

通过LoadBalancerClient类获取到服务的主机名和端口信息

package com.zemel.consumer.controller;

import java.net.URI;

import javax.annotation.Resource;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.cloud.netflix.ribbon.RibbonClient;
import org.springframework.http.HttpEntity;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

import com.zemel.common.MyLoadBalanceConfig;
import com.zemel.vo.Dept;

@RestController
@RequestMapping("/consumer/dept")
@RibbonClient(name="dept-8001", configuration=MyLoadBalanceConfig.class)
public class DeptController {
	
	static final String DEPT_REST_TOPIC = "dept-8001";
	
	@Resource
	private RestTemplate restTemplate;
	
	@Autowired
	private LoadBalancerClient client;
	
	@Resource
	private HttpHeaders headers;

	@GetMapping("/get")
	public Object getDept(long id){
		
		ServiceInstance instance = client.choose(DEPT_REST_TOPIC);
		
		System.out.println("host="+instance.getHost()+"--port:"+instance.getPort() + "--serviceId:"+instance.getServiceId()
		+ "  --uri:" + instance.getUri());
		
		Dept dept = null;
		
		URI deptUri = URI.create(String.format("http://%s:%s/dept/get/"+id, instance.getHost(),instance.getPort()));
		
//		return dept; 
		return this.restTemplate.exchange(deptUri, HttpMethod.GET, new HttpEntity(headers), Dept.class);
		
//		return this.restTemplate.exchange(DEPT_GET_URL+id, HttpMethod.GET, new HttpEntity(headers), Dept.class);
//		return this.restTemplate.getForEntity(DEPT_GET_URL+id, Dept.class);
	}
	
	/*@GetMapping("/list")
	public Object list(){
		return this.restTemplate.exchange(DEPT_LIST_URL, HttpMethod.GET, new HttpEntity(headers), List.class);
//		return this.restTemplate.getForObject(DEPT_LIST_URL, List.class);
	}
	
	@GetMapping("/add")
	public Object add(Dept dept){
		return this.restTemplate.exchange(DEPT_ADD_URL, HttpMethod.POST, new HttpEntity(dept,headers), Boolean.class);
//		return this.restTemplate.postForObject(DEPT_ADD_URL, dept, Boolean.class);
	}*/
}