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