一、使用LoadBalancerClient
LoadBalancerClient接口的命名中，可以看出这是一个负载均衡客户端的抽象定义，spring提供了一个实现
org.springframework.cloud.netflix.ribbon.RibbonLoadBalancerClient
1、pom.xml

org.springframework.boot
spring-boot-starter-parent
2.1.7.RELEASE




org.springframework.boot
spring-boot-starter-actuator


org.springframework.cloud
spring-cloud-starter



com.alibaba
fastjson
1.2.47


org.springframework.boot
spring-boot-starter-thymeleaf


org.springframework.boot
spring-boot-starter-web



org.springframework.boot
spring-boot-starter-test
test


2、application.yml
server:
#服务端口号
port: 8080
spring:
application:
#服务名称
name: vis-basic-report
thymeleaf:
cache: false
cloud:
consul:
host: 192.168.12.125
port: 8500
discovery:
#是否需要注册到consul中
register: true
#服务地址直接为IP地址
hostname: 192.168.12.1
management:
endpoints:
web:
exposure:
include: '*'
3、启动类
package com.wzl.springcloud.basic.report;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.Bean;
import com.netflix.hystrix.contrib.metrics.eventstream.HystrixMetricsStreamServlet;@SpringBootApplication
br/>@SpringBootApplication
public class ReportServerApplication {
public static void main(String[] args) {
SpringApplication.run(ReportServerApplication.class, args);
}
}
4、相关实现类
package com.wzl.springcloud.basic.report.service;
import java.util.List;
import com.wzl.springcloud.basic.report.vo.City;
import com.wzl.springcloud.basic.report.vo.WeatherResponse;
public interface WeatherReportService {
// 根据城市ID同步天气
WeatherResponse getDataByCityId(String cityId);
// 根据城市name同步天气
WeatherResponse getDataByCityName(String cityName);
// 获取所有城市列表
List getDataByCities();
}
package com.wzl.springcloud.basic.report.service.impl;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;
import com.alibaba.fastjson.JSON;
import com.wzl.springcloud.basic.report.service.WeatherReportService;
import com.wzl.springcloud.basic.report.vo.City;
import com.wzl.springcloud.basic.report.vo.WeatherResponse;
/**

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• LoadBalancer客户端*/
  @Service
  br/>*/
  @Service
  br/>@Autowired
  

  @Override
  public WeatherResponse getDataByCityId(String cityId) {
  WeatherResponse weatherResponse = null;
  ServiceInstance serviceInstance = loadBalancer.choose("vis-basic-weather");
  String uri = serviceInstance.getUri().toString() + "/weather/cityId/" + cityId;
  // 调用服务接口来获取
  ResponseEntity respString = new RestTemplate().getForEntity(uri, String.class);
  // 判断ResponseEntity的状态码是否为200，为200时取出strBody
  if (respString.getStatusCodeValue() == 200) {
  String jsonStr = respString.getBody();
  weatherResponse = JSON.parseObject(jsonStr, WeatherResponse.class);
  }
  return weatherResponse;}
  @Override
  br/>}
  @Override
  WeatherResponse weatherResponse = null;
  ServiceInstance serviceInstance = loadBalancer.choose("vis-basic-weather");
  String uri = serviceInstance.getUri().toString() + "/weather/cityName/" + cityName;
  // 调用服务接口来获取
  ResponseEntity respString = new RestTemplate().getForEntity(uri, String.class);
  // 判断ResponseEntity的状态码是否为200，为200时取出strBody
  if (respString.getStatusCodeValue() == 200) {
  String jsonStr = respString.getBody();
  weatherResponse = JSON.parseObject(jsonStr, WeatherResponse.class);
  }
  return weatherResponse;
  }
  function(){ //AxiTrader返佣：www.kaifx.cn/broker/axitrader.html@Override
  br/>@Override
  getDataByCities() {
  List cityList = null;
  ServiceInstance serviceInstance = loadBalancer.choose("vis-basic-city");
  String uri = serviceInstance.getUri().toString() + "/cities/getList";
  // 调用服务接口来获取
  ResponseEntity respString = new RestTemplate().getForEntity(uri, String.class);
  // 判断ResponseEntity的状态码是否为200，为200时取出strBody
  if (respString.getStatusCodeValue() == 200) {
  String jsonStr = respString.getBody();
  cityList = JSON.parseArray(jsonStr, City.class);
  }
  return cityList;
  }
  }
  二、使用Ribbon
  Spring Cloud Ribbon是基于Netflix Ribbon实现的一套客户端负载均衡的工具。它是一个基于HTTP和TCP的客户端负载均衡器。它可以通过在客户端中配置ribbonServerList来设置服务端列表去轮询访问以达到均衡负载的作用。
  1、pom.xml
  
  org.springframework.boot
  spring-boot-starter-parent
  2.1.7.RELEASE
  
  

  
  
  org.springframework.boot
  spring-boot-starter-actuator
  
  
  org.springframework.cloud
  spring-cloud
  
  
  
  com.alibaba
  fastjson
  1.2.47
  
  
  org.springframework.boot
  spring-boot-starter-thymeleaf
  
  
  org.springframework.cloud
  spring-cloud-starter-netflix-ribbon
  
  
  org.springframework.boot
  spring-boot-starter-web
  
  
  
  org.springframework.boot
  spring-boot-starter-test
  test
  
  
  2、application.yml
  server:
  #服务端口号
  port: 8080
  spring:
  application:
  #服务名称
  name: vis-basic-report
  thymeleaf:
  cache: false
  cloud:
  consul:
  host: 192.168.12.125
  port: 8500
  discovery:
  #是否需要注册到consul中
  register: true
  #服务地址直接为IP地址
  hostname: 192.168.12.1
  management:
  endpoints:
  web:
  exposure:
  include: '*'
  3、启动类 & RestConfiguration
  package com.wzl.springcloud.basic.report;
  import org.springframework.boot.SpringApplication;
  import org.springframework.boot.autoconfigure.SpringBootApplication;
  import org.springframework.cloud.openfeign.EnableFeignClients;@SpringBootApplication
  br/>@SpringBootApplication
  public class ReportServerApplication {
  public static void main(String[] args) {
  SpringApplication.run(ReportServerApplication.class, args);
  }
  }
  package com.wzl.springcloud.basic.report.config;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.boot.web.client.RestTemplateBuilder;
  import org.springframework.cloud.client.loadbalancer.LoadBalanced;
  import org.springframework.context.annotation.Bean;
  import org.springframework.context.annotation.Configuration;
  import org.springframework.web.client.RestTemplate;@Configuration
  br/>@Configuration
  br/>@Autowired
  br/>@Bean
  public RestTemplate restTemplate() {
  return builder.build();}
  }
  @LoadBalanced注解表明这个restRemplate开启负载均衡的功能，用LoadBalancerClient配置，并且会替换URL中的服务名称为具体的IP地址
  br/>}
  }
  @LoadBalanced注解表明这个restRemplate开启负载均衡的功能，用LoadBalancerClient配置，并且会替换URL中的服务名称为具体的IP地址
  package com.wzl.springcloud.basic.report.service;
  import java.util.List;
  import com.wzl.springcloud.basic.report.vo.City;
  import com.wzl.springcloud.basic.report.vo.WeatherResponse;
  public interface WeatherReportService {
  // 根据城市ID同步天气
  WeatherResponse getDataByCityId(String cityId);
  // 根据城市name同步天气
  WeatherResponse getDataByCityName(String cityName);
  // 获取所有城市列表
  List getDataByCities();
  }
  package com.wzl.springcloud.basic.report.service.impl;
  import java.util.List;
  import org.springframework.beans.factory.annotation.Autowired;
  import org.springframework.http.ResponseEntity;
  import org.springframework.stereotype.Service;
  import org.springframework.web.client.RestTemplate;
  import com.alibaba.fastjson.JSON;
  import com.wzl.springcloud.basic.report.service.WeatherReportService;
  import com.wzl.springcloud.basic.report.vo.City;
  import com.wzl.springcloud.basic.report.vo.WeatherResponse;
  /**

• Ribbon客户端*/
  @Service
  br/>*/
  @Service
  br/>@Autowired
  private RestTemplate restTemplate;

  @Override
  public WeatherResponse getDataByCityId(String cityId) {
  WeatherResponse weatherResponse = null;
  String uri = "http://vis-basic-weather/weather/cityId/" + cityId;
  // 调用服务接口来获取
  ResponseEntity respString = restTemplate.getForEntity(uri, String.class);
  // 判断ResponseEntity的状态码是否为200，为200时取出strBody
  if (respString.getStatusCodeValue() == 200) {
  String jsonStr = respString.getBody();
  weatherResponse = JSON.parseObject(jsonStr, WeatherResponse.class);
  }
  return weatherResponse;}
  @Override
  br/>}
  @Override
  WeatherResponse weatherResponse = null;
  String uri = "http://vis-basic-weather/weather/cityName/" + cityName;
  // 调用服务接口来获取
  ResponseEntity respString = restTemplate.getForEntity(uri, String.class);
  // 判断ResponseEntity的状态码是否为200，为200时取出strBody
  if (respString.getStatusCodeValue() == 200) {
  String jsonStr = respString.getBody();
  weatherResponse = JSON.parseObject(jsonStr, WeatherResponse.class);
  }
  return weatherResponse;}
  @Override
  br/>}
  @Override
  getDataByCities() {
  List cityList = null;
  String uri = "http://vis-basic-city/cities/getList";
  // 调用服务接口来获取
  ResponseEntity respString = restTemplate.getForEntity(uri, String.class);
  // 判断ResponseEntity的状态码是否为200，为200时取出strBody
  if (respString.getStatusCodeValue() == 200) {
  String jsonStr = respString.getBody();
  cityList = JSON.parseArray(jsonStr, City.class);
  }
  return cityList;
  }
  }

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