SpringCloud的简介在这里先不多说,直接上代码。
1.首先新建一个springboot项目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>
<!-- 主函数的入口 -->
<mainClass>com.wz.springcloud.eureka.EurekaApplication</mainClass>
</configuration>
</plugin>
</plugins>
</build>
2.配置yml文件,多环境配置,maven多环境打包这里不多说
首先新建application.yml文件,内容如下:
spring:
application:
name: eureka-server
profiles: ## application-{}.yml
#active: $spring.profiles.active$
active: dev ##默认加载application-dev.yml文件,可以采用$spring.profiles.active$这种方式用maven多环境打包来定义是dev 还是 pro
application-dev.yml 内容如下:
server:
port: 8001
eureka:
instance:
hostname: eureka1
lease-renewal-interval-in-seconds: 10 ##客户端向服务器(注册中心发送心跳的时间间隔)
lease-expiration-duration-in-seconds: 120 ##服务器(注册中心)租期到期的时间, 也就是说服务器在收到最后一次心跳的时间上线
client:
register-with-eureka: false
fetch-registry: false
service-url:
#defaultZone: http://localhost:8001/eureka/
defaultZone: http://eureka2:8002/eureka/ ##互相注册到对方--高可用服务发现
3.新建EurekaApplication内容如下:启动注册中心
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 //启用服务器的配置中心
@SpringBootApplication
public class EurekaApplication {
public static void main(String[] args) {
SpringApplication.run(EurekaApplication.class, args);
}
}
这里第一个注册中心就OK了 ,接下来在复制一份一模一样的项目就可以了
只需要将 application-dev.yml中的 server.port修改一下可以改为8002 还有将eureka.instance.hostname 改为eureka2。既然是高可用那么在defaultZone中一定要互相引用注册到对方,做的高可用的服务发现
最后右击-->Run AS -->spring boot App启动就可以了
在浏览器输入http://localhost:8001/ 或者http://localhost:8002/ 就可以了。
8001界面如下:
8002界面如下:
以上是高可用的Eureka 注册中心为两台。
接下来写一个服务的提供者和消费者来通过注册中心调用。
首先新建一个生产者provider。springboot项目
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>
<!-- 主函数的入口 -->
<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:
##单点配置:
#defaultZone: http://eureka1:8001/eureka/
##高可用配置
defaultZone: http://eureka1:8001/eureka/,http://eureka2:8002/eureka/
一个简单的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";
}
}
启动入口类ProviderApplication
package com.wz.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
@EnableDiscoveryClient //表示我是一个服务,注册到服务中心上
@SpringBootApplication
public class ProviderApplication {
public static void main(String[] args) {
SpringApplication.run(ProviderApplication.class, args);
}
}
启动provider界面如下,将服务注册到了注册中心
接下来消费者pom.xml如下,这里新加了一个负载均衡ribbon
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<!-- 负载均衡组件的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>
<!-- 主函数的入口 -->
<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:
##单点配置:
#defaultZone: http://eureka1:8001/eureka/
##高可用配置
defaultZone: http://eureka1:8001/eureka/,http://eureka2:8002/eureka/
简单的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
启动入口类: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 //表示我是一个服务,注册到服务中心上
@SpringBootApplication
public class ConsumerApplication {
@Bean
@LoadBalanced //自动负载均衡: 他的机制是(通过)application name 去寻找服务发现 然后去做负载均衡策略的
public RestTemplate restTemplate(){
return new RestTemplate();
}
public static void main(String[] args) {
SpringApplication.run(ConsumerApplication.class, args);
}
}
启动consumer,两个服务都注册上来了,如图
最后访问一下
通过consumer调用了provider,并且provider将信息返回到了consumer
高可用的eureka注册中心就先到这里。