远程调用 | OpenFeign+LoadBalanced的使用

目录

[RestTemplate 注入](#RestTemplate 注入)

[OpenFeign 服务](#OpenFeign 服务)

[LoadBalanced 服务](#LoadBalanced 服务)

[LoadBalanced 注解](#LoadBalanced 注解)



RestTemplate 注入

创建 配置类,这里配置后 就不用再重新new一个了,而是直接调用即可

java 复制代码
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
public class UserConfig {

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

OpenFeign 服务

java 复制代码
import com.jkglxt.healthRecodr.entity.HealthRecord;
import com.jkglxt.users.entity.User;
import com.jkglxt.users.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;
import java.util.List;

@Slf4j
@Service
public class UserServiceImpl implements UserService {

    @Autowired
    DiscoveryClient discoveryClient;
    @Autowired
    RestTemplate restTemplate;
  

    @Override
    public User createUser(int userId, int healthRecordId) {
        HealthRecord remoteHealthRecord = getRemoteHealthRecordWithLoadBalancerAnnotation(healthRecordId);

        if (userId == 0 || healthRecordId == 0){
            return null;
        }
        // 保存用户信息
        User user = new User();
        user.setUserId(userId);
        user.setHealthRecordId(healthRecordId);
        user.setPassword("password");
        user.setUsername("username");
        // TODO: 远程查询用户健康信息
        user.setUserHealthRecord(Arrays.asList(remoteHealthRecord));
        System.out.println("保存用户信息:" + user.toString());
        return user;
    }

    // 获取远程健康信息
    private HealthRecord getRemoteHealthRecord(int healthRecordId) {
        // 1. 获取健康信息服务的所有机器IP地址+端口号
        List<ServiceInstance> instances = discoveryClient.getInstances("service-health-record");

        ServiceInstance serviceInstance = instances.get(0);


        // 2.编辑调用健康信息服务Url
        String url = "http://" + serviceInstance.getHost()+":"+serviceInstance.getPort()+"/health/"+healthRecordId;

        log.info("远程健康信息服务Url:{}", url);
        // 3.给远程发送请求,获取健康信息
//        RestTemplate restTemplate = new RestTemplate();
        HealthRecord healthRecord = restTemplate.getForObject(url, HealthRecord.class);
        return healthRecord;
    }

}

LoadBalanced 服务

java 复制代码
import com.jkglxt.healthRecodr.entity.HealthRecord;
import com.jkglxt.users.entity.User;
import com.jkglxt.users.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;
import java.util.List;

@Slf4j
@Service
public class UserServiceImpl implements UserService {

 
    @Autowired
    RestTemplate restTemplate;
    @Autowired
    LoadBalancerClient loadBalancerClient;

    @Override
    public User createUser(int userId, int healthRecordId) {
        HealthRecord remoteHealthRecord = getRemoteHealthRecordWithLoadBalancerAnnotation(healthRecordId);

        if (userId == 0 || healthRecordId == 0){
            return null;
        }
        // 保存用户信息
        User user = new User();
        user.setUserId(userId);
        user.setHealthRecordId(healthRecordId);
        user.setPassword("password");
        user.setUsername("username");
        // TODO: 远程查询用户健康信息
        user.setUserHealthRecord(Arrays.asList(remoteHealthRecord));
        System.out.println("保存用户信息:" + user.toString());
        return user;
    }


    // 获取远程健康信息 负载均衡
    private HealthRecord getRemoteHealthRecordWithLoadBalancer(int healthRecordId) {
        // 1. 获取健康信息服务的所有机器IP地址+端口号
        ServiceInstance choose = loadBalancerClient.choose("service-health-record");

             // 2.编辑调用健康信息服务Url
        String url = "http://" + choose.getHost()+":"+choose.getPort()+"/health/"+healthRecordId;

        log.info("远程健康信息服务Url:{}", url);
        // 3.给远程发送请求,获取健康信息
        HealthRecord healthRecord = restTemplate.getForObject(url, HealthRecord.class);
        return healthRecord;
    }

}

LoadBalanced 注解

java 复制代码
import com.jkglxt.healthRecodr.entity.HealthRecord;
import com.jkglxt.users.entity.User;
import com.jkglxt.users.service.UserService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;
import org.springframework.stereotype.Service;
import org.springframework.web.client.RestTemplate;

import java.util.Arrays;
import java.util.List;

@Slf4j
@Service
public class UserServiceImpl implements UserService {

   
    @Autowired
    RestTemplate restTemplate;
    @Autowired
    LoadBalancerClient loadBalancerClient;

    @Override
    public User createUser(int userId, int healthRecordId) {
        HealthRecord remoteHealthRecord = getRemoteHealthRecordWithLoadBalancerAnnotation(healthRecordId);

        if (userId == 0 || healthRecordId == 0){
            return null;
        }
        // 保存用户信息
        User user = new User();
        user.setUserId(userId);
        user.setHealthRecordId(healthRecordId);
        user.setPassword("password");
        user.setUsername("username");
        // TODO: 远程查询用户健康信息
        user.setUserHealthRecord(Arrays.asList(remoteHealthRecord));
        System.out.println("保存用户信息:" + user.toString());
        return user;
    }
    

    // 获取远程健康信息 负载均衡 注释
    private HealthRecord getRemoteHealthRecordWithLoadBalancerAnnotation(int healthRecordId) {
        // 1. 获取健康信息服务的所有机器IP地址+端口号
        String url = "http://service-health-record/health/"+healthRecordId;

        log.info("远程健康信息服务Url:{}", url);
        // 3.给远程发送请求,获取健康信息
        HealthRecord healthRecord = restTemplate.getForObject(url, HealthRecord.class);
        return healthRecord;
    }
}

-- Thank you --

相关推荐
沧澜sincerely2 分钟前
分布式3PC理论
分布式·一致性协议·3pc
掘金-我是哪吒1 小时前
分布式微服务系统架构第169集:1万~10万QPS的查当前订单列表
分布式·微服务·云原生·架构·系统架构
Zhao_yani1 小时前
RabbitMQ相关知识
分布式·rabbitmq
我就是全世界2 小时前
【存储选型终极指南】RustFS vs MinIO:5大维度深度对决,95%技术团队的选择秘密!
开发语言·分布式·rust·存储
楠枬3 小时前
zookeeper 实现分布式锁
分布式·zookeeper
milanyangbo6 小时前
“卧槽,系统又崩了!”——别慌,这也许是你看过最通俗易懂的分布式入门
分布式·后端·云原生·架构
失散136 小时前
分布式专题——1.1 Redis单机、主从、哨兵、集群部署
java·数据库·redis·分布式·架构
你我约定有三8 小时前
软件启动时加配置文件 vs 不加配置文件
java·分布式·zookeeper
励志成为糕手11 小时前
ZooKeeper架构深度解析:分布式协调服务的核心设计与实现
大数据·分布式·zookeeper·架构·一致性
瑞瑞绮绮12 小时前
分布式事务的Java实践
java·分布式·springcloud