Spring Cloud整合ZooKeeper

ZooKeeper安装
工程创建流程
1.创建Maven父工程，修改pom.xml，删除src文件夹

<?xml version="1.0" encoding="UTF-8"?>
<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.zmx</groupId>
    <artifactId>spring-cloud-zk</artifactId>
    <packaging>pom</packaging>
    <version>1.0-SNAPSHOT</version>
    <modules>
        <module>zk-provider</module>
        <module>zk-consumer</module>
    </modules>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.12.RELEASE</version>
    </parent>
</project>

2.新建服务提供者
（1）引入依赖

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>spring-cloud-zk</artifactId>
        <groupId>com.zmx</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>zk-provider</artifactId>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Edgware.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

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

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>commons-logging</artifactId>
                    <groupId>commons-logging</groupId>
                </exclusion>
            </exclusions>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
    </dependencies>
</project>

（2）创建application.properties

server.port=8083
spring.application.name=spring-cloud-zookeeper-provider
spring.cloud.zookeeper.connectString=localhost:2181
spring.cloud.zookeeper.discovery.instanceHost=localhost
spring.cloud.zookeeper.discovery.instancePort=${server.port}

（3）创建启动类

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

（4）创建控制类

@RestController
public class ZkProviderController {
    @GetMapping("/provider")
    public String provider() {
        return "----------provider----------";
    }
}

（5）项目结构如图：

3.创建服务消费者
（1）引入依赖

<?xml version="1.0" encoding="UTF-8"?>
<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">
    <parent>
        <artifactId>spring-cloud-zk</artifactId>
        <groupId>com.zmx</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>zk-consumer</artifactId>

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

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Edgware.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>
</project>

（2）新建application.properties

server.port=8084
spring.application.name=spring-cloud-zookeeper-consumer
spring.cloud.zookeeper.connectString=localhost:2181
spring.cloud.zookeeper.discovery.instanceHost=localhost
spring.cloud.zookeeper.discovery.instancePort=${server.port}

（3）新建启动类

@SpringBootApplication
public class ZkConsumerApplication {
    @Bean
    public RestTemplate restTemplate() {
        return new RestTemplate();
    }

    public static void main(String[] args){
        SpringApplication.run(ZkConsumerApplication.class,args);
    }
}

（4）新建控制类

@RestController
public class ZkConsumerController {
    @Autowired
    private RestTemplate restTemplate;

    @GetMapping(value = "/consumer")
    public String consumer() throws Exception {
        return restTemplate.getForObject("http://localhost:8083/provider", String.class);
    }
}

（5）项目结构如图：

4.运行http://localhost:8084/consumer
5.遇到的问题
（1）java.net.ConnectException: Connection refused: no further information
解决方法：ZooKeeper没有启动
（2）java.lang.ClassNotFoundException: rx.Single
解决方法：zk依赖与boot 版本兼容问题，

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Edgware.SR3</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

进行版本控制
6.源码地址：https://gitee.com/Alisa_zmx/spring-cloud-zk