前提：

先安裝好ZooKeeper的環(huán)境，搭建參考：http://www.cnblogs.com/EasonJim/p/7482961.html

說(shuō)明：

可以再簡(jiǎn)單的理解為有兩方協(xié)作，一個(gè)是服務(wù)提供這，另一個(gè)是服務(wù)消費(fèi)者。

搭建實(shí)例：

說(shuō)明：基于Maven的模塊工程

父工程POM：

<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.jsoft.testzookeeper</groupId><artifactId>zookeeperdemo</artifactId><version>0.0.1-SNAPSHOT</version><packaging>pom</packaging><name>ZooKeeperDemo</name><description>This is ZookKeeperDemo</description><parent><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-parent</artifactId><version>1.4.5.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><!-- 健康監(jiān)控 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-actuator</artifactId></dependency><!-- 斷路器 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-hystrix</artifactId></dependency><!-- 負(fù)載均衡 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-ribbon</artifactId></dependency><!-- ZK依賴 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-zookeeper-discovery</artifactId></dependency><!-- Web支持 --><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency> <!-- 測(cè)試 --><dependency><groupId>junit</groupId><artifactId>junit</artifactId><scope>test</scope></dependency> </dependencies><dependencyManagement><dependencies><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-dependencies</artifactId><version>Camden.SR7</version><type>pom</type><scope>import</scope></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>3.8.1</version><scope>test</scope></dependency></dependencies></dependencyManagement> <modules><module>zookeeperservice</module><module>zookeeperclient</module></modules> </project>

服務(wù)提供者POM：

<?xml version="1.0"?> <projectxsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><modelVersion>4.0.0</modelVersion><parent><groupId>com.jsoft.testzookeeper</groupId><artifactId>zookeeperdemo</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.jsoft.testzookeeper</groupId><artifactId>zookeeperservice</artifactId><version>0.0.1-SNAPSHOT</version><name>zookeeperservice</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies></dependencies> </project>

application.properties：

server.port=8800 spring.application.name=/service-zookeeper spring.cloud.zookeeper.discovery.root=/spring-cloud-service spring.cloud.zookeeper.connect-string=localhost:2181

說(shuō)明：定義端口，應(yīng)用的名稱，服務(wù)在ZK的路徑，ZK的服務(wù)器地址，其中ZK的服務(wù)器地址可以有多個(gè)，用逗號(hào)隔開(kāi)。

HelloController：

服務(wù)接口

package com.jsoft.testzookeeper.service.controller;import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestMethod; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController;@RestController public class HelloController {private static final Logger log = LoggerFactory.getLogger(HelloController.class);@RequestMapping(value = "/hello", method = RequestMethod.GET)public String sayHello(@RequestParam(name = "name") String name) {log.info("param:name->{}", name);return "hello: " + name;} }

App：

程序入口

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

說(shuō)明：其中要@EnableDiscoveryClient標(biāo)注為服務(wù)發(fā)現(xiàn)注解。

服務(wù)消費(fèi)者POM：

<?xml version="1.0"?> <projectxsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"><modelVersion>4.0.0</modelVersion><parent><groupId>com.jsoft.testzookeeper</groupId><artifactId>zookeeperdemo</artifactId><version>0.0.1-SNAPSHOT</version></parent><groupId>com.jsoft.testzookeeper</groupId><artifactId>zookeeperclient</artifactId><version>0.0.1-SNAPSHOT</version><name>zookeeperclient</name><url>http://maven.apache.org</url><properties><project.build.sourceEncoding>UTF-8</project.build.sourceEncoding></properties><dependencies><!-- Feign客戶端 --><dependency><groupId>org.springframework.cloud</groupId><artifactId>spring-cloud-starter-feign</artifactId></dependency></dependencies> </project>

說(shuō)明：由于使用了Feign客戶端，所以引入Feign依賴。

application.properties：

server.port=8810 spring.application.name=/client-zookeeper spring.cloud.zookeeper.discovery.register=false spring.cloud.zookeeper.discovery.root=/spring-cloud-service spring.cloud.zookeeper.connect-string=localhost:2181 spring.cloud.zookeeper.dependencies.service-zookeeper.required=true spring.cloud.zookeeper.dependencies.service-zookeeper.path=/service-zookeeper spring.cloud.zookeeper.dependencies.service-zookeeper.loadBalancerType=ROUND_ROBIN

說(shuō)明：由于服務(wù)提供者的應(yīng)用名使用了斜杠，所以必須采用依賴關(guān)系spring.cloud.zookeeper.dependencies進(jìn)行別名的選擇，注意，使用了這個(gè)之后要引入actuator健康監(jiān)控組件，不然調(diào)用時(shí)會(huì)報(bào)錯(cuò)。

App：

程序入口

package com.jsoft.testzookeeper.client;import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.circuitbreaker.EnableCircuitBreaker; import org.springframework.cloud.client.discovery.EnableDiscoveryClient; import org.springframework.cloud.netflix.feign.EnableFeignClients;@SpringBootApplication @EnableDiscoveryClient @EnableCircuitBreaker @EnableFeignClients public class App {public static void main( String[] args ){SpringApplication.run(App.class,args);} }

說(shuō)明：@EnableCircuitBreaker為斷路器的支持，@EnableFeignClients為Feign客戶端的支持。

Client的實(shí)現(xiàn)：

主要有兩種，基于RestTemplate和Feign

RestTemplate

package com.jsoft.testzookeeper.client.service;import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import org.springframework.web.client.RestTemplate;@Service public class HelloService {@Autowiredprivate RestTemplate restTemplate;@HystrixCommand(fallbackMethod = "sayHelloFallback")public String sayHello(String name) {return restTemplate.getForEntity("http://service-zookeeper/hello?name=" + name, String.class).getBody();}private String sayHelloFallback(String name) {return "service error";} }

說(shuō)明：@HystrixCommand為斷路器寫法。

Feign

package com.jsoft.testzookeeper.client.service;import org.springframework.cloud.netflix.feign.FeignClient; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam;import com.jsoft.testzookeeper.client.service.fallback.FeignFallback;@FeignClient(value = "service-zookeeper", fallback = FeignFallback.class) public interface ServiceFeign {@RequestMapping(value = "/hello")String sayHello(@RequestParam(name = "name") String name); }

說(shuō)明：fallback為斷路器回調(diào)。

消費(fèi)服務(wù)：

package com.jsoft.testzookeeper.client.controller;import org.springframework.beans.factory.annotation.Autowired; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.RequestParam; import org.springframework.web.bind.annotation.RestController;import com.jsoft.testzookeeper.client.service.HelloService; import com.jsoft.testzookeeper.client.service.ServiceFeign;@RestController public class HelloController {@Autowiredprivate HelloService helloService;@Autowiredprivate ServiceFeign serviceFeign;@RequestMapping(value = "hello")public String hello(@RequestParam String name) {return helloService.sayHello(name);}@RequestMapping(value = "hello2")public String hello2(@RequestParam String name) {return serviceFeign.sayHello(name);} }

總結(jié)：

Spring Cloud在服務(wù)發(fā)現(xiàn)和注冊(cè)上其實(shí)很多坑，上面展示的只是核心代碼，最全的還是參考例子代碼進(jìn)行調(diào)試。

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Maven示例：

https://github.com/easonjim/spring-cloud-demo/tree/master/ZooKeeper

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參考：

http://theseus.iteye.com/blog/2366237

http://www.cnblogs.com/skyblog/p/5133752.html

http://blog.csdn.net/mn960mn/article/details/51803703

http://www.jianshu.com/p/775c363d0fda

總結(jié)

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