SpringCloud之服务注册发现(Spring Cloud Zookeeper) |第十五章 -yellowcong

悠悠 2022-05-29 05:55 195阅读 0赞

> 我们刚刚把服务注册弄到了Consul上了，当然springcloud也设计了，将服务弄到zookeeper上，让大家一起玩啊。配置Zookeeper注册发现的步骤：1、配置pom.xml，添加`spring-cloud-starter-zookeeper-all`依赖包，让springcloud 支持zookeeper，2、配置bootstrap.yml，设定zookeeper的服务信息，3、配置application.yml，设定服务信息，4、配置启动类，添加`@EnableDiscoveryClient`注解,让系统支持注册服务。5、添加测试类，6、启动服务并测试。

## 代码地址 ##

https://gitee.com/yellowcong/springcloud/tree/master/chapter15

### 目录结构 ###

![这里写图片描述][SouthEast]

## 搭建Zookeeper服务注册发现客户端 ##

基本的步骤1、配置pom.xml，添加`spring-cloud-starter-zookeeper-all`依赖包，让springcloud 支持zookeeper，2、配置bootstrap.yml，设定zookeeper的服务信息，3、配置application.yml 4、配置启动类，添加`@EnableDiscoveryClient`注解,让系统支持注册服务。5、添加测试类，6、启动服务并测试。

### 1、配置pom.xml ###

添加`spring-cloud-starter-zookeeper-all`依赖包，让springcloud 支持zookeeper，其中，这个`spring-cloud-starter-zookeeper-all` 是包含了两个依赖包，一个是注册中心的，一个是配置服务的。

![这里写图片描述][SouthEast 1]

<dependency>
        <groupId>org.springframework.cloud</groupId>
        <artifactId>spring-cloud-starter-zookeeper-all</artifactId>
    </dependency>
    
    <dependencyManagement>  
      <dependencies>  
           <dependency>  
               <groupId>org.springframework.cloud</groupId>  
               <artifactId>spring-cloud-zookeeper-dependencies</artifactId>  
               <version>1.0.1.RELEASE</version>  
               <type>pom</type>  
               <scope>import</scope>  
           </dependency>  
       </dependencies>  
    </dependencyManagement>

下面是完整的pom.xml配置

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
        <modelVersion>4.0.0</modelVersion>
    
        <groupId>yellowcong.com</groupId>
        <artifactId>cas-client-springboot</artifactId>
        <version>0.0.1-SNAPSHOT</version>
        <packaging>jar</packaging>
    
        <name>cas-client-springboot</name>
        <url>http://maven.apache.org</url>
    
        <repositories>
            <repository>
                <id>spring-milestones</id>
                <name>Spring Milestones</name>
                <url>https://repo.spring.io/milestone</url>
                <snapshots>
                    <enabled>false</enabled>
                </snapshots>
            </repository>
        </repositories>
    
        
        <parent>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-parent</artifactId>
            <version>1.5.10.RELEASE</version>
        </parent>
    
        <properties>
            <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
            <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
            <java.version>1.8</java.version>
        </properties>
    
        <dependencies>
    
            
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-starter-zookeeper-all</artifactId>
            </dependency>
    
            <dependency>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-test</artifactId>
                <scope>test</scope>
            </dependency>
    
        </dependencies>
    
        <dependencyManagement>  
            <dependencies>  
                <dependency>  
                    <groupId>org.springframework.cloud</groupId>  
                    <artifactId>spring-cloud-zookeeper-dependencies</artifactId>  
                    <version>1.0.1.RELEASE</version>  
                    <type>pom</type>  
                    <scope>import</scope>  
                </dependency>  
            </dependencies>  
        </dependencyManagement>  
    
    
        <build>
            <plugins>
                
                <plugin>
                    <groupId>org.springframework.boot</groupId>
                    <artifactId>spring-boot-maven-plugin</artifactId>
                    <dependencies>
                        <dependency>
                            <groupId>org.springframework</groupId>
                            <artifactId>springloaded</artifactId>
                            <version>1.2.4.RELEASE</version>
                        </dependency>
                    </dependencies>
                </plugin>
            </plugins>
        </build>
    </project>

### 2、配置bootstrap.yml ###

这个配置zookeeper注册服务，需要在bootstrap.yml 文件中，配置zookeeper服务信息，在application.yml 配置无效，连接不上

#配置zookeeper注册服务器地址
    spring:
      cloud:
        zookeeper:
          discovery:
            instancePort: ${server.port} #端口号
            instanceHost: yellowcong.com  #当前服务的初始化地址（可以不填）
            enabled: true
            register: true
          connectString: 192.168.66.100:2182 # 多节点配置,通过逗号分割192.168.253.31:2181,192.168.253.32:2181

### 3、配置application.yml ###

添加zookeeper的依赖

# 注册服务的端口
    server:
      port: 8761
    
    ## 关闭安全控制
    management:
      security:
        enabled: false
    #配置服务的名称
    spring:
      application:
        name: zk-client

### 4、配置启动类 ###

添加`@EnableDiscoveryClient`注解,让系统支持注册服务。

package com.yellowcong;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
    
    @SpringBootApplication
    @EnableDiscoveryClient
    public class ConfigMain {
    
        public static void main(String[] args) {
            SpringApplication.run(ConfigMain.class, args);
        }
    }

### 5、配置测试类 ###

说实话，这些东西都很类似，所以直接复制粘贴过来即可，查看zookeeper服务注册上的信息。

package com.yellowcong.main;
    
    import java.util.List;
    
    import org.springframework.beans.factory.annotation.Autowired;
    import org.springframework.cloud.client.ServiceInstance;
    import org.springframework.cloud.client.discovery.DiscoveryClient;
    import org.springframework.web.bind.annotation.GetMapping;
    import org.springframework.web.bind.annotation.RestController;
    
    @RestController
    public class TestController {
    
        @Autowired
        DiscoveryClient discoveryClient;
    
        @GetMapping("/test")
        public String test() {
            //获取实例化的注册节点
            List<ServiceInstance> list = discoveryClient.getInstances("CONSUL-CLIENT");
    
            //获取实例化的服务
            StringBuffer sb = new StringBuffer();
            if (list != null && list.size() > 0 ) {
                sb.append(list.get(0).getUri()+",");
            }
            return "hello world "+sb.toString();
        }
    }

### 6、测试服务 ###

可以看到创建了一个节点。  
![这里写图片描述][SouthEast 2]

直接在命令行获取zk的节点信息  
![这里写图片描述][SouthEast 3]

访问 [http://yellowcong.com:8761/test][http_yellowcong.com_8761_test] 查看服务  
![这里写图片描述][SouthEast 4]

## 常见错误 ##

### 1、java.net.ConnectException: Connection refused: no further information ###

这个错误，多半是客户端配置的zookeeper地址有毛病

java.net.ConnectException: Connection refused: no further information
        at sun.nio.ch.SocketChannelImpl.checkConnect(Native Method) ~[na:1.8.0_102]
        at sun.nio.ch.SocketChannelImpl.finishConnect(SocketChannelImpl.java:717) ~[na:1.8.0_102]
        at org.apache.zookeeper.ClientCnxnSocketNIO.doTransport(ClientCnxnSocketNIO.java:361) ~[zookeeper-3.4.6.jar:3.4.6-1569965]
        at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1081) ~[zookeeper-3.4.6.jar:3.4.6-1569965]

## 参考文章 ##

1、[Java笔记(3) - 使用Spring Cloud Zookeeper + Feign实现服务发现][Java_3_ - _Spring Cloud Zookeeper _ Feign]

[SouthEast]: /images/20220529/13e7d0471de749edbb5784b2b3add626.png
[SouthEast 1]: /images/20220529/a5a8e243023e4024ab9c25c929538f76.png
[SouthEast 2]: /images/20220529/2a903562c72a4858a6ce7a60c0e16973.png
[SouthEast 3]: /images/20220529/c6c27b84ff1f470a95d099d1cc4106ed.png
[http_yellowcong.com_8761_test]: http://yellowcong.com:8761/test
[SouthEast 4]: /images/20220529/e6b01731fd7f4d74acdc34d28d6aba35.png
[Java_3_ - _Spring Cloud Zookeeper _ Feign]: https://www.cnblogs.com/karascanvas/p/7521942.html