SpringCloud的簡(jiǎn)介在這里先不多說(shuō)偿枕，直接上代碼隙券。
1.首先新建一個(gè)springboot項(xiàng)目pom文件如下：
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>spring-cloud-001-eureka-a</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!-- 主函數(shù)的入口 -->
<mainClass>com.wz.springcloud.eureka.EurekaApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
2.配置yml文件榜聂，多環(huán)境配置，maven多環(huán)境打包這里不多說(shuō)
首先新建application.yml文件陌凳，內(nèi)容如下：
spring:
application:
name: eureka-server
profiles: ## application-{}.yml
#active: $spring.profiles.active$
active: dev ##默認(rèn)加載application-dev.yml文件剥懒，可以采用$spring.profiles.active$這種方式用maven多環(huán)境打包來(lái)定義是dev 還是 pro
application-dev.yml 內(nèi)容如下：
server:
port: 8001
eureka:
instance:
hostname: eureka1
lease-renewal-interval-in-seconds: 10 ##客戶(hù)端向服務(wù)器（注冊(cè)中心發(fā)送心跳的時(shí)間間隔）
lease-expiration-duration-in-seconds: 120 ##服務(wù)器（注冊(cè)中心）租期到期的時(shí)間, 也就是說(shuō)服務(wù)器在收到最后一次心跳的時(shí)間上線(xiàn)
client:
register-with-eureka: false
fetch-registry: false
service-url:
#defaultZone: http://localhost:8001/eureka/
defaultZone: http://eureka2:8002/eureka/ ##互相注冊(cè)到對(duì)方--高可用服務(wù)發(fā)現(xiàn)
3.新建EurekaApplication內(nèi)容如下：?jiǎn)?dòng)注冊(cè)中心
package com.wz.springcloud.eureka;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@EnableEurekaServer //啟用服務(wù)器的配置中心
@SpringBootApplication
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
}
這里第一個(gè)注冊(cè)中心就OK了 ，接下來(lái)在復(fù)制一份一模一樣的項(xiàng)目就可以了
只需要將 application-dev.yml中的 server.port修改一下可以改為8002 還有將eureka.instance.hostname 改為eureka2合敦。既然是高可用那么在defaultZone中一定要互相引用注冊(cè)到對(duì)方初橘，做的高可用的服務(wù)發(fā)現(xiàn)
最后右擊-->Run AS -->spring boot App啟動(dòng)就可以了
在瀏覽器輸入http://localhost:8001/ 或者http://localhost:8002/ 就可以了。
8001界面如下：
Paste_Image.png
8002界面如下：
Paste_Image.png
以上是高可用的Eureka 注冊(cè)中心為兩臺(tái)充岛。
接下來(lái)寫(xiě)一個(gè)服務(wù)的提供者和消費(fèi)者來(lái)通過(guò)注冊(cè)中心調(diào)用保檐。
首先新建一個(gè)生產(chǎn)者provider。springboot項(xiàng)目
pom.xml如下：
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>spring-cloud-01-provider</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!-- 主函數(shù)的入口 -->
<mainClass>bhz.springcloud.ProviderApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
application.yml
spring:
application:
name: provider-service1
server:
context-path: /provider
port: 7001
eureka:
client:
service-url:
##單點(diǎn)配置:
#defaultZone: http://eureka1:8001/eureka/
##高可用配置
defaultZone: http://eureka1:8001/eureka/,http://eureka2:8002/eureka/
一個(gè)簡(jiǎn)單的controller
package com.wz.springcloud.controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
@RestController
public class IndexController {
@RequestMapping(value = "/hello", method = {RequestMethod.GET})
public String hello(){
return "Hello World";
}
}
啟動(dòng)入口類(lèi)ProviderApplication
package com.wz.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@EnableDiscoveryClient //表示我是一個(gè)服務(wù),注冊(cè)到服務(wù)中心上
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderApplication.class, args);
}
}
啟動(dòng)provider界面如下崔梗，將服務(wù)注冊(cè)到了注冊(cè)中心
Paste_Image.png
接下來(lái)消費(fèi)者pom.xml如下夜只，這里新加了一個(gè)負(fù)載均衡ribbon
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<!-- 負(fù)載均衡組件的jar -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-ribbon</artifactId>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Dalston.SR1</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<finalName>spring-cloud-001-consumer</finalName>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
<configuration>
<!-- 主函數(shù)的入口 -->
<mainClass>bhz.springcloud.ConsumerApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
application.yml
spring:
application:
name: consumer-service1
server:
context-path: /consumer
port: 7002
eureka:
client:
service-url:
##單點(diǎn)配置:
#defaultZone: http://eureka1:8001/eureka/
##高可用配置
defaultZone: http://eureka1:8001/eureka/,http://eureka2:8002/eureka/
簡(jiǎn)單的controller
package cmo.wz.springcloud.controller;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class ConsumerController {
@Autowired
private RestTemplate restTemplate;
@RequestMapping(value="getHello", method={RequestMethod.GET})
public String getHello() {
ResponseEntity<String> str=restTemplate.getForEntity("http://provider-service1/provider/hello", String.class);
return str.getBody();
}
}
restTemplate有很多方法可以多看下api
啟動(dòng)入口類(lèi)：ConsumerApplication
package cmo.wz.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.web.client.RestTemplate;
@EnableDiscoveryClient //表示我是一個(gè)服務(wù),注冊(cè)到服務(wù)中心上
@SpringBootApplication
public class ConsumerApplication {
@Bean
@LoadBalanced //自動(dòng)負(fù)載均衡： 他的機(jī)制是（通過(guò)）application name 去尋找服務(wù)發(fā)現(xiàn) 然后去做負(fù)載均衡策略的
public RestTemplate restTemplate(){
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(ConsumerApplication.class, args);
}
}
啟動(dòng)consumer,兩個(gè)服務(wù)都注冊(cè)上來(lái)了，如圖
Paste_Image.png
最后訪(fǎng)問(wèn)一下
Paste_Image.png
通過(guò)consumer調(diào)用了provider,并且provider將信息返回到了consumer
高可用的eureka注冊(cè)中心就先到這里蒜魄。
