采用隨機(jī)負(fù)載均衡策略，四線服務(wù)之間的調(diào)用

2個(gè)用戶中心，1個(gè)內(nèi)容中心，內(nèi)容中心調(diào)用用戶中心服務(wù)

package com.itmuch.contentcenter.service.impl;import com.itmuch.contentcenter.dao.content.ShareMapper; import com.itmuch.contentcenter.domain.entity.content.Share; import com.itmuch.contentcenter.dto.ShareDTO; import com.itmuch.contentcenter.dto.UserDTO; import com.itmuch.contentcenter.service.IShareService; import lombok.RequiredArgsConstructor; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.cloud.client.ServiceInstance; import org.springframework.cloud.client.discovery.DiscoveryClient; import org.springframework.stereotype.Service; import org.springframework.web.client.RestTemplate;import java.util.List; import java.util.concurrent.ThreadLocalRandom; import java.util.stream.Collectors;/*** @author gblfy* @ClassNme ShareServiceImpl* @Description TODO* @Date 2019/7/6 17:58* @version1.0*/ @Slf4j @Service @RequiredArgsConstructor(onConstructor = @__(@Autowired)) public class ShareServiceImpl implements IShareService {private final ShareMapper shareMapper;private final RestTemplate restTemplate;private final DiscoveryClient discoveryClient;@Overridepublic ShareDTO findById(Integer id) {//獲取分享詳情Share share = this.shareMapper.selectByPrimaryKey(id);//發(fā)布人idInteger userId = share.getUserId();//怎么調(diào)用用戶微服務(wù)的/users/{userId}呢?List<ServiceInstance> instances = discoveryClient.getInstances("user-center");List<String> targetURLList = instances.stream()//數(shù)據(jù)變換.map(instance -> instance.getUri().toString() + "/users/{id}").collect(Collectors.toList());int i = ThreadLocalRandom.current().nextInt(targetURLList.size());log.info("請(qǐng)求的目標(biāo)地址：{}", targetURLList.get(i));UserDTO userDTO = this.restTemplate.getForObject(targetURLList.get(i), UserDTO.class, userId);//消息的裝配ShareDTO shareDTO = new ShareDTO();BeanUtils.copyProperties(share, shareDTO);shareDTO.setWxNickname(userDTO.getWxNickname());return shareDTO;} }

使用Ribbon實(shí)現(xiàn)負(fù)載均衡

Ribbon是什么？

引入Ribbon后的架構(gòu)嚴(yán)謹(jǐn)

整合Ribbon實(shí)現(xiàn)負(fù)載均衡

添加依賴

此依賴中已包括

<dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-alibaba-nacos-discovery</artifactId></dependency>

啟動(dòng)類加注解

@Bean@LoadBalancedpublic RestTemplate restTemplate(){return new RestTemplate();}

寫配置(無)

Ribbon重構(gòu)后，負(fù)載均衡效果

package com.itmuch.contentcenter.service.impl;import com.itmuch.contentcenter.dao.content.ShareMapper; import com.itmuch.contentcenter.domain.entity.content.Share; import com.itmuch.contentcenter.dto.ShareDTO; import com.itmuch.contentcenter.dto.UserDTO; import com.itmuch.contentcenter.service.IShareService; import lombok.RequiredArgsConstructor; import lombok.extern.slf4j.Slf4j; import org.springframework.beans.BeanUtils; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.web.client.RestTemplate;/*** @author gblfy* @ClassNme ShareServiceImpl* @Description TODO* @Date 2019/7/6 17:58* @version1.0*/ @Slf4j @Service @RequiredArgsConstructor(onConstructor = @__(@Autowired)) public class ShareServiceImpl implements IShareService {private final ShareMapper shareMapper;private final RestTemplate restTemplate;@Overridepublic ShareDTO findById(Integer id) {//獲取分享詳情Share share = this.shareMapper.selectByPrimaryKey(id);//發(fā)布人idInteger userId = share.getUserId();//怎么調(diào)用用戶微服務(wù)的/users/{userId}呢?//Ribbo重構(gòu)后UserDTO userDTO = this.restTemplate.getForObject("http://user-center/users/{userId}", UserDTO.class, userId);//消息的裝配ShareDTO shareDTO = new ShareDTO();BeanUtils.copyProperties(share, shareDTO);shareDTO.setWxNickname(userDTO.getWxNickname());return shareDTO;} }

總結(jié)

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