springCould中的zookeeper-从小白开始【3】

目录

1.启动zookeeper❤️❤️❤️

2.创建8004模块 ❤️❤️❤️

 3.临时节点还是永久节点❤️❤️❤️

4.创建zk80消费模块❤️❤️❤️

---

1.启动zookeeper❤️❤️❤️

• 进入自己zookeeper的bin目录下 分别使用命令：

./zkServer.sh start   和 ./zkCli.sh -server 主机名

2.创建8004模块 ❤️❤️❤️

1.建模块

在父工程下创建模块

注意：jdk版本和，maven版本

2.添加pom

1.springboot依赖

2.mybatis依赖

3.druid依赖

4.mysql依赖

5.zookeeper依赖

 
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-actuator
        
        
            org.mybatis.spring.boot
            mybatis-spring-boot-starter
        
        
            com.alibaba
            druid-spring-boot-starter
            1.2.16
        
        
        
            mysql
            mysql-connector-java
        
        
        
            org.springframework.boot
            spring-boot-starter-jdbc
        
        
            org.springframework.boot
            spring-boot-devtools
            runtime
            true
        
        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        

        
        
            org.example
            cloud-api-commons
            ${project.version}
        
        
        
            org.springframework.cloud
            spring-cloud-starter-zookeeper-discovery
        
    

3.添加yml

1.服务端口

2.服务名称

3.数据库连接池

4.zookeeper连接地址

5.mybatis配置

server:
  port: 8004


spring:
  application:
    #服务名称
    name: cloud-provider-payment

  datasource:
    #druid连接池
    type: com.alibaba.druid.pool.DruidDataSource
    driver-class-name: com.mysql.cj.jdbc.Driver
    url: jdbc:mysql://localhost:3306/springcloud
    username: root
    password: 123456
    #zookeeper服务注册中心
  cloud:
    zookeeper:
      connect-string: 192.168.20.129:2181,192.168.20.130:2181,192.168.20.131:2181

mybatis:
  mapper-locations: classpath:mapper/*.xml
  type-aliases-package: com.xz.springcloud.entity

4.添加主启动类

@EnableDiscoveryClient:将服务注册到服务注册中心（zookeeper）

@SpringBootApplication
@EnableDiscoveryClient//作为服务中心
public class PaymentMain8004 {
    public static void main(String[] args) {
        SpringApplication.run(PaymentMain8004.class);
    }
}

5.编写业务类

@RestController
public class PaymentController {

    @Autowired
    private PaymentService paymentService;

    @Value("${server.port}")
    private String serverPort;

    @GetMapping("/payment/getById/{id}")
    public CommonResult getById(@PathVariable("id") Integer id){
        Payment payment = paymentService.getPaymentById(id);
        if (payment!=null){
            return new CommonResult(200,"查询成功,serverPort:"+serverPort,payment);
        }else {
            return new CommonResult(404,"查询无果，serverPort:"+serverPort,null);
        }
    }

    @RequestMapping("/payment/zk")
    public String paymentZk(){
       return "springCloud with zookeeper:"+serverPort+"\t"+ UUID.randomUUID().toString();
    }
}

6.测试

• 1.启动主启动类,刷新浏览器

• 2.访问zookeeper

 说明zookeeper配置成功

 3.临时节点还是永久节点❤️❤️❤️

当关闭8004服务时，在查询zookeeper，发现节点剔除

所以：zookeeper存储的是临时节点，当服务消失时，会马上剔除 

4.创建zk80消费模块❤️❤️❤️

1.建模块

在父工程下创建模块

注意jdk版本和maven版本

2.写pom

1.springboot依赖

2.通用依赖

3.zookeeper依赖

        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-actuator
        
        
            org.projectlombok
            lombok
            true
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.example
            cloud-api-commons
            ${project.version}
        
        
        
            org.springframework.cloud
            spring-cloud-starter-zookeeper-discovery
        

    

3.改yml

1.服务端口

2.服务名

3.zookeeper连接ip（我这里使用集群）

server:
  port: 80
  
spring:
  application:
    name: cloud-consumer-order
    
  cloud:
    zookeeper:
      connect-string: 192.168.20.129:2181,192.168.20.130:2181,192.168.20.131:2181

4.主启动类

@EnableDiscoveryClient添加上

@SpringBootApplication
@EnableDiscoveryClient
public class OrderZkMain80 {
    public static void main(String[] args) {
        SpringApplication.run(OrderZkMain80.class);
    }
}

5.业务代码

• 1.先将Rest Template注入到spring中

注意：因为访问的是服务名，而不是具体的ip，所以加上@LoadBalance注解

@Configuration
public class ApplicationConfig {

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

• 2.controller

1.声明常量，表示zookeeper中8004的服务名

2.注入RestTemplate

3.调用restTemplate访问

@RestController
public class OrderController {

    public static final String INVOKE_URL = "http://cloud-provider-payment";

    @Autowired
    private RestTemplate restTemplate;

    @GetMapping("/payment/getById/{id}")
    public CommonResult  getPayment(@PathVariable("id") Integer id){
        return restTemplate.getForObject(INVOKE_URL+"/payment/getById/"+id,CommonResult.class);
    }

    @GetMapping("/payment/zk")
    public String getDiscovery(){
        return restTemplate.getForObject(INVOKE_URL+"/payment/zk",String.class);
    }
}

6.测试

• 1.使用80访问，刷新浏览器，依然成功

• 2.查看zookeeper节点 ，节点创建成功