利用SpringCloud搭建一个最简单的微服务框架

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: 127.0.0.1
       client:
            registerWithEureka: false
            fetchRegistry: false
            serviceUrl:
                     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>
        <!-- sping cloud 注册服务 -->
        <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>
        <!-- sping cloud 监控  http://localhost:8080/health -->
        <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>
        <!-- sping cloud 注册服务 -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka</artifactId>
        </dependency>
            <!-- sping cloud 路由 -->
        <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