springcloud H版+alibaba cloud 1

1，springcloud服务更新

服务注册中心：eureka
由zookeeper，Consul，Nacos（重点）

服务调用：ribbon
loadBalancer可能后面会替代ribbon

服务调用2：feign
由openFeign替代

服务降级：Hystrix
国内经常使用。国外已经在使用resilience4j
国内用alibaba sentienl替代

网关：zuul
gateway替代

配置中心：config
由Nacos替代

消息总线：bus
由Nacos替代

所以Nacos是重点之中的重点

2，搭建基础框架springcloud

1，创建一个总的父工程。springcloud，project

设置编码utf-8

然后设置注解生效

选择java8

文件type过滤

3，父工程pom的创建

如果一个项目的pom.xml文件里有< dependenciesmanager>那么一定是父工程

父项目中指定了版本号。子项目中就可以不用指定版本号了。。。

创建子工程时。直接创建maven项目

1，创建payment provider项目
粘贴父项目的pom.xml

application.yml

数据库db2019
payment的创建

创建payment提供者。写好增删改查。。。。

4，开启热部署

开启自动热部署功能
1，

2，这个放父工程，finalName可写可不写

3，

4，

5，重启idea完成热部署

###热部署只能在开发环境下使用

order只能有controller。客户端这块

拷贝provider的entity

6，restTemplete的。。。服务调用
创建一个config类

controller实现客户端调用provider 写操作

读操作

如果插入数据库只有主键没有内容。处理如下

在消费者这边和生产者这边加上@requestbody注解

5，聚合工程重构（common公共类）

上一节。。服务调用者和服务提供者。。。entity重复了。我们要将它们重构

创建一个公共类
cloud-api-commons
pom.xml

把entity粘贴过来

然后clean，install

然后再改造80和8001
删除掉entity

然后分别引入坐标

如果最后出现包扫描有问题

请在两个启动类上加注解
@mapperscan(“com.atguigu.springcloud.dao”)
@ComponentScan(“com.atguigu.springcloud.*”)

6，eureka server

1,pom.xml

  
        
            org.springframework.cloud
            spring-cloud-starter-netflix-eureka-server
        

2，application.yml

server:
  port: 7001

eureka:
  instance:
    hostname: eureka7001.com #eureka服务端的实例名称
  client:
    #false表示不向注册中心注册自己
    register-with-eureka: false
    #false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
    fetch-registry: false
    service-url:
      #设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址
      #defaultZone: http://eureka7002.com:7002/eureka/  #互相注册
      defaultZone: http://eureka7001.com:7001/eureka/ #单机模式
  #server:
    #关闭自我保护机制，保证不可用服务被及时剔除
    #enable-self-preservation: false
    #eviction-interval-timer-in-ms: 2000

3，主启动

package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7001 {
    public static void main(String[] args) {
        SpringApplication.run(EurekaMain7001.class,args);
    }
}

8001和80整合eureka

创建微服务提供者8001和微服务消费者80
pom

yml
8001

server:
  port: 8001

spring:
  application:
    name: cloud-provider-service

  datasource:
    type: com.alibaba.druid.pool.DruidDataSource      #当前数据源操作类型
    driver-class-name: org.gjt.mm.mysql.Driver        #mysql驱动包
    url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
    username: root
    password: ljs


eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true
    register-with-eureka: true
    #是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka #单机版
      #defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版
  instance:
    instance-id: payment8001
    prefer-ip-address: true #访问路径可以显示IP地址
    #Eureka客户端向服务端发送心跳的时间间隔，单位为秒（默认是30秒）
    #lease-renewal-interval-in-seconds: 1
    #Eurekaf服务端在收到最后一次心跳后等待时间上限，单位为秒（默认是90秒），超时将剔除服务
    #lease-expiration-duration-in-seconds: 2


mybatis:
    mapper-locations: classpath:mapper/*.xml
    type-aliases-package: com.atguigu.springcloud.entities       #所有Entity别名类所在包

dao

package com.atguigu.springcloud.dao;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;

@Mapper
public interface PaymentDao {
    int create(Payment payment);

    Payment getPaymentById(@Param("id") Long id);
}

dao.xml

    
        insert into payment(serial) values(#{serial})
    

    
        
        
    
    
        select * from payment where id=#{id};
    

service

package com.atguigu.springcloud.service;
import com.atguigu.springcloud.entities.Payment;
import org.apache.ibatis.annotations.Param;

public interface PaymentService {
    public int create(Payment payment);

    public Payment getPaymentById(@Param("id") Long id);
}

serviceImpl

package com.atguigu.springcloud.service;
import com.atguigu.springcloud.dao.PaymentDao;
import com.atguigu.springcloud.entities.Payment;
import org.springframework.stereotype.Service;
import javax.annotation.Resource;
@Service
public class PaymentServiceImpl implements PaymentService{
    @Resource
    private PaymentDao paymentDao;

    public int create(Payment payment){
        return paymentDao.create(payment);
    }
    public Payment getPaymentById(Long id){
        return paymentDao.getPaymentById(id);
    }
}

controller

package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
import javax.xml.soap.SAAJResult;
import java.util.List;
import java.util.concurrent.TimeUnit;

@RestController
@Slf4j
public class PaymentController {
    @Resource
    private PaymentService paymentService;
    @Value("${server.port}")
    private String serverPort;

    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping(value = "/payment/discovery")
    public Object discovery(){
        List services = discoveryClient.getServices();  //得到所有的微服务
        for (String element : services) {
            log.info("*****element:"+element);
        }
        List instances = discoveryClient.getInstances("CLOUD-PROVIDER-SERVICE"); //得到一个具体微服务的所有实例
        for (ServiceInstance instance : instances){
            log.info(instance.getServiceId()+"\t"+instance.getHost()+"\t"+instance.getPort()+"\t"+instance.getUri());
        }
        return this.discoveryClient;
    }

    //只传给前端CommonResult，不需要前端了解其他的组件
    @PostMapping(value = "/payment/create")
    public CommonResult create(@RequestBody Payment payment){
        int result = paymentService.create(payment);
        log.info("*****插入结果："+result);
        if(result > 0){
            return new CommonResult(200,"插入数据成功,serverPort："+serverPort,result);
        }else{
            return new CommonResult(444,"插入数据失败",null);
        }
    }
    @GetMapping(value = "/payment/get/{id}")
    public CommonResult getPaymentById(@PathVariable("id") Long id){
        Payment payment = paymentService.getPaymentById(id);
        log.info("*****插入结果："+payment);
        if(payment != null){
            return new CommonResult(200,"查询成功,serverPort："+serverPort,payment);
        }else{
            return new CommonResult(444,"没有对应记录,查询ID："+id,null);
        }
    }

    @GetMapping(value = "/payment/lb")
    public String getPaymentLB(){
        return serverPort;
    }

    @GetMapping(value = "/payment/feign/timeout")
    public String paymentFeignTimeout(){
        //暂停几秒钟线程
        try{
            TimeUnit.SECONDS.sleep(3);
        }catch (InterruptedException e){
            e.printStackTrace();
        }
        return serverPort;
    }

    @GetMapping("/payment/zipkin")
    public String paymentZipkin(){
        return "hi, i'am paymentzipkin server fall back,welcome to atguigu, O(∩_∩)O哈哈~";
    }
}

80

server:
  port: 80

spring:
  application:
    name: cloud-order-server


eureka:
  client:
    #表示是否将自己注册进EurekaServer默认为true
    register-with-eureka: true
    fetch-registry: true
    service-url:
      defaultZone: http://localhost:7001/eureka
      #defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka  #集群版

服务名指定

启动类加注解

@SpringBootApplication
@EnableEurekaClient

mySelfRule

package com.atguigu.myrule;
import com.netflix.loadbalancer.IRule;
import com.netflix.loadbalancer.RandomRule;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;

/**
 * 自定义负载均衡规则类
 * @author wsk
 * @date 2020/3/13 14:56
 */
@Configuration
public class MySelfRule {
    @Bean
    public IRule myRule(){
        return new RandomRule();
    }
}

config

package com.atguigu.springcloud.config;
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 ApplicationContextConfig {
    @Bean
    //@LoadBalanced   //使用@LoadBalanced注解赋予RestTemplate负载均衡的能力
    public RestTemplate getRestTemplate(){
        return new RestTemplate();
    }
}

lb

package com.atguigu.springcloud.lb;
import org.springframework.cloud.client.ServiceInstance;
import java.util.List;

/**
 * 模拟 ILoadBalancer 的接口，选择哪一个负载算法和机器
 * @author wsk
 * @date 2020/3/13 17:11
 */
public interface LoadBalancer {
    //获取eureka上的活着的机器总数
    ServiceInstance instances(List serviceInstanceList);

}

package com.atguigu.springcloud.lb;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.stereotype.Component;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
/**
 * Ribbon 手写轮询算法
 * @author wsk
 * @date 2020/3/13 17:16
 */
@Component
public class MyLB implements LoadBalancer {
    //原子类
    private AtomicInteger atomicInteger = new AtomicInteger(0);

    public final int getAndIncrement(){
        int current;
        int next;
        do{
            current = this.atomicInteger.get();
            //超过最大值，为0，重新计数 2147483647 Integer.MAX_VALUE，不直接写方法是因为方法运行时每次都会创建一个栈区，而写死就不会，涉及Jvm调优
            next = current >= 2147483647 ? 0 : current + 1;
            //自旋锁
        }while (!this.atomicInteger.compareAndSet(current,next));
        System.out.println("*****第几次访问，次数next："+next);
        return next;
    }

    @Override
    public ServiceInstance instances(List serviceInstance) {
        int index = getAndIncrement() % serviceInstance.size();
        return serviceInstance.get(index);
    }
}

controller

package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.lb.LoadBalancer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.client.ServiceInstance;
import org.springframework.cloud.client.discovery.DiscoveryClient;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
import javax.annotation.Resource;
import java.net.URI;
import java.util.List;

@RestController
@Slf4j
public class OrderController {
    //private static final String PAYMENT_URL="http://localhost:8001";
    //通过在eureka上注册过的微服务名称调用
    private static final String PAYMENT_URL = "http://CLOUD-PROVIDER-SERVICE";

    @Resource
    private RestTemplate restTemplate;
    /**
     * 自定义负载均衡规则
     */
    @Resource
    private LoadBalancer loadBalancer;
    @Resource
    private DiscoveryClient discoveryClient;

    @GetMapping("/consumer/payment/create")
    public CommonResult create(Payment payment){
        return restTemplate.postForObject(PAYMENT_URL+"/payment/create",payment,CommonResult.class);
    }

    @GetMapping("/consumer/payment/get/{id}")
    public CommonResult getPayment(@PathVariable("id") Long id){
        return restTemplate.getForObject(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);
    }

    @GetMapping("/consumer/payment/getForEntity/{id}")
    public CommonResult getPayment2(@PathVariable("id") Long id){
        ResponseEntity entity = restTemplate.getForEntity(PAYMENT_URL+"/payment/get/"+id,CommonResult.class);

        if(entity.getStatusCode().is2xxSuccessful()){
            return entity.getBody();
        }else{
            return new CommonResult(444,"操作失败");
        }
    }
    /**
     * 路由规则：轮询
     * @param 
     * @return 
     */
    @GetMapping(value = "/consumer/payment/lb")
    public String getPaymentLB(){
        List instances = discoveryClient.getInstances("CLOUD-PROVIDER-SERVICE");
        if(instances == null || instances.size() <= 0){
            return null;
        }
        ServiceInstance serviceInstance = loadBalancer.instances(instances);
        URI uri = serviceInstance.getUri();
        return restTemplate.getForObject(uri+"/payment/lb",String.class);
    }
    //============> zipkin + sleuth
    @GetMapping("/consumer/payment/zipkin")
    public String paymentZipkin(){
        String result = restTemplate.getForObject("http://localhost:8001" + "/payment/zipkin", String.class);
        return result;
    }
}

eureka 集群

做集群修改window10配置文件

会出现相互注册的情况