springcloud简单整合zookeeper，feign

1. 学会使用才是研究工具的第一步

最近一直苦恼该如何学习，感觉看了很多的资料和视频去学习zookeeper，了解分析原理。但是过了一段时间，当我再想起zookeeper是啥的时候，我发现脑子里面已经很空白，空白到我甚至都不知道如何在现在的springboot中如何去使用它。索性自己尝试去使用zookeeper作为服务注册中心在实际中使用。

2. Spring Cloud让事情变得异常简单

只需要简单的依赖包引入，加上某些注解和配置即可完成整合
一定要注意zookeeper和spring cloud start的版本要对应好，否则服务启动会报错（这里使用的zookeeper版本是3.4.14）。

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xiong</groupId>
    <artifactId>zk-discovery</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>zk-discovery</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Edgware.SR5</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-zookeeper-discovery</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.properties

server.port=8089
spring.application.name=zk-mem
spring.cloud.zookeeper.connect-string=192.168.182.128:2181

注解开启服务注册与发现

@EnableDiscoveryClient
@SpringBootApplication
public class ZkDiscoveryApplication {

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

}

测试controller

@RestController
@RequestMapping("/api/demo")
public class TestController {

    @GetMapping("/test")
    public String hello() {
        return UUID.randomUUID().toString();
    }
}

消费者

pom.xml

<?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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.9.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.xiong</groupId>
    <artifactId>zk-consumer</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>zk-consumer</name>
    <description>Demo project for Spring Boot</description>

    <properties>
        <java.version>1.8</java.version>
        <spring-cloud.version>Edgware.SR5</spring-cloud.version>
    </properties>

    <dependencies>
        <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.cloud</groupId>
            <artifactId>spring-cloud-starter-feign</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
            <exclusions>
                <exclusion>
                    <groupId>org.junit.vintage</groupId>
                    <artifactId>junit-vintage-engine</artifactId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>${spring-cloud.version}</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>
        </dependencies>
    </dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

application.properties

server.port=8081
spring.application.name=zk-fegin
spring.cloud.zookeeper.connect-string=192.168.182.128:2181
spring.cloud.discovery.enabled=true
spring.cloud.zookeeper.discovery.register=true

注解开启服务注册与发现，开启feign

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

fegin client声明定义

@FeignClient(value = "zk-mem", path = "/api/demo")
public interface DemoService {
    @GetMapping("/test")
    String testHello();
}

test controller

@RestController
@RequestMapping("/fegin")
public class TestFeignController {

    @Autowired
    DemoService demoService;

    @GetMapping("remote")
    public String feginHello() {
        return demoService.testHello();
    }

    @GetMapping("local")
    public String localHello() {
        return "hello fegin";
    }
}

调用结果截图：

fegin-remote

local