微服务示例-Spring Cloud

1~开发准备

　JDK:1.8

　　Spring Boot:1.5.9.RELEASE

　　Spring Coud:Edgware.RELEASE

　　IDE:IntelliJ IDEA 2017

　　Maven:3.3.9

2~创建服务注册中心

File->New->Projects->Spring Initializr

image

点击Next,填写信息如下:

image

然后点击Next,选择如下:

image

点击Next,然后点击Finish.项目结构如下:

image

其中pom.xml文件内容如下:

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 4.0.0
 
 
com.human
sbc-service
0.0.1-SNAPSHOT
jar

sbc-service
Demo project for Spring Boot


    org.springframework.boot
    spring-boot-starter-parent
    1.5.9.RELEASE
     



    UTF-8
    UTF-8
    1.8
    Edgware.RELEASE



    
        org.springframework.cloud
        spring-cloud-starter-eureka-server
    

    
        org.springframework.boot
        spring-boot-starter-test
        test
    



    
        
            org.springframework.cloud
            spring-cloud-dependencies
            ${spring-cloud.version}
            pom
            import
        
    



    
        
            org.springframework.boot
            spring-boot-maven-plugin
        
    

 
 

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项目初始化完成,修改resources文件夹下application.properties文件,内容如下:

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server.port=8081
 spring.application.name=human-service
 eureka.instance.hostname=localhost
 eureka.client.registerWithEureka=false
 eureka.client.fetchRegistry=false
 eureka.client.serviceUrl.defaultZone=http://{server.port}/eureka/

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然后修改主程序代码如下:

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package com.human.sbcservice; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
 
 
@SpringBootApplication
 @EnableEurekaServer public class SbcServiceApplication { public static void main(String[] args) {
 SpringApplication.run(SbcServiceApplication.class, args);
 }
 }

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至此,一个微服务注册中心完成

3~创建微服务提供者

大体上与创建注册中心相同,在选择依赖的时候如下图

image

选择完毕,点击Next,然后点击Finish,完成后项目结构如图:

image

pom.xml代码如下:

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 4.0.0
 
 
com.human
sbc-user
0.0.1-SNAPSHOT
jar

sbc-user3
Demo project for Spring Boot


    org.springframework.boot
    spring-boot-starter-parent
    1.5.9.RELEASE
     



    UTF-8
    UTF-8
    1.8
    Edgware.RELEASE



    
        org.springframework.cloud
        spring-cloud-starter-eureka
    
    
        org.springframework.boot
        spring-boot-starter-web
    

    
        org.springframework.boot
        spring-boot-starter-test
        test
    



    
        
            org.springframework.cloud
            spring-cloud-dependencies
            ${spring-cloud.version}
            pom
            import
        
    



    
        
            org.springframework.boot
            spring-boot-maven-plugin
        
    

 
 

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然后打开主程序文件,修改代码如下:

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package com.human.sbcuser; import org.springframework.boot.SpringApplication; import org.springframework.boot.autoconfigure.SpringBootApplication; import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
 
 
@EnableDiscoveryClient//Eureka微服务注解
 @SpringBootApplication public class SbcUserApplication { public static void main(String[] args) {
 SpringApplication.run(SbcUserApplication.class, args);
 }
 }

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修改application.properties文件,内容如下:

server.port=8082
 eureka.client.service-url.defaultZone=http://localhost:8081/eureka/
 spring.application.name=cloud-simple-service

新建一个名为HelloController文件,具体代码:

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package com.human.sbcuser; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody;
 
 
@Controller public class HelloController {
 @RequestMapping("/")
 @ResponseBod public String hello()
 { return "hello KinY ~KoKo";
 }
 }

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至此,一个简单的服务提供者创建完毕

4~创建微服务消费者

利用Rbbon创建客户端,其中group:com.human,Artifact:sbc-consumer,剩下基本上与创建注册中心相同,其中选择依赖时如下图:

image

完成后,pom.xml文件内容如下:

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 4.0.0
 
 
com.human
sbc-consumer
0.0.1-SNAPSHOT
jar

sbc-service
Demo project for Spring Boot


    org.springframework.boot
    spring-boot-starter-parent
    1.5.9.RELEASE
     



    UTF-8
    UTF-8
    1.8
    Edgware.RELEASE



    
        org.springframework.boot
        spring-boot-starter-web
    
    
        org.springframework.cloud
        spring-cloud-starter-eureka-server
    
    
        org.springframework.cloud
        spring-cloud-starter-ribbon
    
    
        org.springframework.boot
        spring-boot-starter-test
        test
    



    
        
            org.springframework.cloud
            spring-cloud-dependencies
            ${spring-cloud.version}
            pom
            import
        
    



    
        
            org.springframework.boot
            spring-boot-maven-plugin
        
    

 
 

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修改程序主类,内容如下:

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package com.human.sbconsumer; 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
 @SpringBootApplication public class SbcConsumerApplication {
 
 
@Bean
@LoadBalanced
RestTemplate restTemplate(){ return  new RestTemplate();
} public static void main(String[] args) {
    SpringApplication.run(SbcConsumerApplication.class, args);
}
 
 
}

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修改配置文件application.properties,内容如下:

server.port=8083
 eureka.client.service-url.defaultZone=http://localhost:8081/eureka/
 spring.application.name=cloud-simple-consumer

新增HelloController文件,内容如下:

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package com.human.sbconsumer; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Controller; import org.springframework.web.bind.annotation.RequestMapping; import org.springframework.web.bind.annotation.ResponseBody; import org.springframework.web.bind.annotation.RestController; import org.springframework.web.client.RestTemplate;
 
 
@RestController public class HelloController {
 @Autowired
 RestTemplate restTemplate;
 @RequestMapping("/") public String hello()
 { return restTemplate.getForEntity("http://cloud-simple-service/",String.class).getBody();
 }
 }

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至此编码完成.

5~运行

先运行注册中心项目(sbc-service),然后运行服务提供者项目(sbc-user),打开浏览器输入地址:http://localhost:8081/,显示内容如下:

image

其中红色框内,说明服务提供者注册成功,此时访问地址:http://localhost:8082/ 输出文本:hello KinY ~KoKo,说明服务提供者正常运行,下面运行服务消费者(sbc-consumer),再访问http://localhost:8081/ 发现变成如下内容:

image

说明服务客户端也成功注册,下面直接访问 http://localhost:8083/ 浏览器输出文本:hello KinY ~KoKo 大功告成!!
至此一个简配的微服务架构搭建完毕.

6~补充

①:在选择端口时注意不要与其他程序冲突
　　②:其中消费者基于Ribbon创建,Ribbon是基于http和tcp的客户端负载均衡器

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