以zookeeper为注册中心搭建spring cloud环境

在spring cloud体系中，有多种手段实现注册中心，本例中采用zookeeper作为注册中心的角色。服务提供者向zookeeper注册，服务消费者从zookeeper中发现服务提供者的相关信息，从而远程调用服务提供方。

spring cloud与zookeeper的集成主要依赖spring-cloud-starter-zookeeper-discovery模块，下面是实例：

1、服务提供者zktest

引入相关依赖pom.xml

<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>com.dxz.zktestclient</groupId>

    <artifactId>zktestclient</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.3.5.RELEASE</version>   <!--配合spring cloud版本 -->

        <relativePath /> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <!--设置字符编码及java版本 -->

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>

        </dependency>

        <!--用于测试的，本例可省略 -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <!--依赖管理，用于管理spring-cloud的依赖 -->

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-starter-parent</artifactId>

                <version>Brixton.SR3</version>   <!--官网为Angel.SR4版本，但是我使用的时候总是报错 -->

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <!--使用该插件打包 -->

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

启动类

package com.dxz.zktest;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@EnableDiscoveryClient

@SpringBootApplication

public class ZktestApplication {

    public static void main(String[] args) {

        SpringApplication.run(ZktestApplication.class, args);

    }

}

配置信息

1、application.properties

server.port=8822

spring.application.name=zktest

2、bootstrap.properties

spring.cloud.zookeeper.connectString=192.168.5.14:2181

spring.cloud.zookeeper.discovery.instanceHost=192.168.5.3

spring.cloud.zookeeper.discovery.instancePort=${server.port}

2、服务消费者zktestClient

<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>com.dxz.zktestclient</groupId>

    <artifactId>zktestclient</artifactId>

    <version>0.0.1-SNAPSHOT</version>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>1.3.5.RELEASE</version>   <!--配合spring cloud版本 -->

        <relativePath /> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <!--设置字符编码及java版本 -->

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <java.version>1.8</java.version>

    </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>

        </dependency>

        <!--用于测试的，本例可省略 -->

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

    </dependencies>

    <!--依赖管理，用于管理spring-cloud的依赖 -->

    <dependencyManagement>

        <dependencies>

            <dependency>

                <groupId>org.springframework.cloud</groupId>

                <artifactId>spring-cloud-starter-parent</artifactId>

                <version>Brixton.SR3</version>   <!--官网为Angel.SR4版本，但是我使用的时候总是报错 -->

                <type>pom</type>

                <scope>import</scope>

            </dependency>

        </dependencies>

    </dependencyManagement>

    <build>

        <plugins>

            <!--使用该插件打包 -->

            <plugin>

                <groupId>org.springframework.boot</groupId>

                <artifactId>spring-boot-maven-plugin</artifactId>

            </plugin>

        </plugins>

    </build>

</project>

启动类

package com.dxz.zktestclient;

import org.springframework.beans.factory.annotation.Autowired;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.client.discovery.DiscoveryClient;

import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

import org.springframework.cloud.client.loadbalancer.LoadBalancerClient;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.bind.annotation.RestController;

@SpringBootApplication

@EnableDiscoveryClient

@RestController

public class ZktestClientApplication {

    @Autowired

    private LoadBalancerClient loadBalancer;

    @Autowired

    private DiscoveryClient discovery;

    @RequestMapping("/discovery")

    public Object discovery() {

        System.out.println(loadBalancer.choose("zktest"));

        return "discovery";

    }

    @RequestMapping("/all")

    public Object all() {

        System.out.println(discovery.getServices());

        return "all";

    }

    public static void main(String[] args) {

        SpringApplication.run(ZktestClientApplication.class, args);

    }

}

配置信息

1、application.properties

server.port=8844
spring.application.name=zktestclient

2、bootstrap.properties

spring.cloud.zookeeper.connectString=192.168.5.14:2181

spring.cloud.zookeeper.discovery.register=false

3、zookeeper环境搭建

3.1、zookeeper安装

http://mirrors.shuosc.org/apache/zookeeper/zookeeper-3.4.11/

见《zk 03之 linux上的zookeeper单机与伪集群安装》

4、测试

启动zookeeper后，先启动zktest项目，日志如下

查看zookeeper的节点情况，

在zookeeper所在bin目录下，执行如下命令

[root@localhost bin]# ./zkCli.sh -server localhost，登录成功会展示如下：

查看zookeeper上的"/services/zktest"目录

[zk: localhost(CONNECTED) 1] ls /services/zktest

[22aa5d6a-f8a9-4053-bdc4-1b926ddc10b4]

[zk: localhost(CONNECTED) 2]

启动zktestClient项目