利用SpringCloud搭建一个最简单的微服务框架

https://blog.csdn.net/caicongyang/article/details/52974406

1.微服务

微服务主要包含服务注册，服务发现，服务路由，服务配置，服务熔断，服务降级等一系列的服务，而Spring Cloud为我们提供了个一整套的服务；

本例子为你提供了最简单的一个服务发现例子，包含服务注册发现spingCloudEurekaServer、服务配置中心spingCloudConfServer、以及一个app应用springCloudApp

2.服务注册与发现

spingCloudEurekaServer

pom.xml

<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.caicongyang</groupId>
<artifactId>spingCloudEurekaServer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Angel.SR6</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka-server</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>

Application.java

package com.caicongyang.eureka;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
/**
* Spring could EurekaServer程序主入口
*
* @author Administrator
*
*/
@SpringBootApplication
@EnableEurekaServer
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class, args);
}
}

application.yml （可用properties替代）

server: port: 9999
eureka:instance: hostname: 127.0.0.1client: registerWithEureka: falsefetchRegistry: falseserviceUrl: defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

3.服务配置（全局配置中心）

pom.xml

<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.caicongyang</groupId>
<artifactId>spingCloudConfServer</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Angel.SR6</version>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
<defaultGoal>compile</defaultGoal>
</build>
</project>

application.java

package com.caiconyang.conf;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
/**
* Spring could conf程序主入口
* @author Administrator
*
*/
@SpringBootApplication
@EnableConfigServer
public class Application {
public static void main(String[] args) {
SpringApplication.run(Application.class,args);
}
}

application.properties

server.port=8888
## App配置文件所在git地址
spring.cloud.config.server.git.uri=https://git.oschina.net/caicongyang/springCloudConfigRepo.git
spring.cloud.config.server.git.searchPaths=repo
spring.application.name=spingCloudConfServer

4.App

pom.xml

<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.caicongyang</groupId>
<artifactId>springCloudApp</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-parent</artifactId>
<version>Angel.SR6</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.7</java.version>
<java.encoding>UTF-8</java.encoding>
<springfox.swagger.version>2.2.2</springfox.swagger.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-eureka</artifactId>
</dependency>

<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger2</artifactId>
<version>${springfox.swagger.version}</version>
</dependency>
<dependency>
<groupId>io.springfox</groupId>
<artifactId>springfox-swagger-ui</artifactId>
<version>${springfox.swagger.version}</version>
</dependency>
</dependencies>
<build>
<finalName>spingcould</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${java.version}</source>
<target>${java.version}</target>
<encoding>${java.encoding}</encoding>
<showWarnings>true</showWarnings>
</configuration>
</plugin>
</plugins>
</build>
</project>

Application.java

package com.caicongyang.springCloudApp.main;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
/**
* Spring could web程序主入口
* @author Administrator
*
*/
@Configuration//配置控制
@EnableAutoConfiguration//启用自动配置
@ComponentScan(value={"com.caicongyang.springCloudApp"})//组件扫描
@EnableDiscoveryClient
public class Application {
public static void main(String[] args) {
//第一个简单的应用，
SpringApplication.run(Application.class,args);
}
}

SwaggerConfig.java

package com.caicongyang.springCloudApp.conf;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import springfox.documentation.service.ApiInfo;
import springfox.documentation.spi.DocumentationType;
import springfox.documentation.spring.web.plugins.Docket;
import springfox.documentation.swagger2.annotations.EnableSwagger2;
/**
*
* @author caicongyang1
* @version id: SwaggerConfig, v 0.1 16/4/22 下午4:12 caicongyang1 Exp $$
*/
@Configuration
@EnableSwagger2
public class SwaggerConfig {
@Value("${swagger.ui.enable}") //该配置项在配置中心管理
private boolean environmentSpecificBooleanFlag;
@Bean
public Docket docketFactory() {
return new Docket(DocumentationType.SWAGGER_2).apiInfo(
new ApiInfo("接口文档", "SpingCloud web接口列表", "1.0", "", "", "", "")).enable(environmentSpecificBooleanFlag);
}
}

application.properties

server.port=8080
spring.cloud.config.uri=http://127.0.0.1:8888
spring.cloud.config.name=springCloudApp
spring.cloud.config.profile=${config.profile:dev}
#service discovery url
eureka.client.serviceUrl.defaultZone=http://localhost:9999/eureka/
#service name
spring.application.name=springCloudApp

5.测试与验证

顺序启动服务注册发现spingCloudEurekaServer、服务配置中心spingCloudConfServer、以及一个app应用springCloudApp

测试与验证

1.访问http://localhost:9999/eureka/ app是否已经注册上来

2.访问 http://localhost:8080/swagger-ui.html 是否正常访问，如果正常访问说明争取读取到config配置中心的swagger.ui.enable配置项

6.源码：

以上所有源码：

https://git.oschina.net/caicongyang/springcloud.git