概述：
Spring Boot 2.0相对于之前的版本，变化还是很大的。首先对jdk的版本要求已经不能低于1.8，其次依赖的spring的版本也是最新版本5.0，并集成了功能强大的webflux等。
SpringCloud Finchley 版本的升级也带来了全新组件：Spring Cloud Function 和 Spring Cloud Gateway ,前者致力于函数式编程模块的整合，后者则是网关netflix zuul 的替换组件。
1）需要的依赖：
<?xml version="1.0" encoding="UTF-8"?>
<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.iyb</groupId>
<artifactId>saturn</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>sc-saturn</name>
<description>sc-saturn for Spring Boot</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.0.1.RELEASE</version>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
<mapper.version>3.4.0</mapper.version>
<pagehelper.version>4.1.6</pagehelper.version>
<fastjson.version>1.2.13</fastjson.version>
<jackson.version>2.8.5</jackson.version>
<druid.version>1.0.27</druid.version>
<mysql.version>5.1.40</mysql.version>
<commons-fileupload.version>1.3.1</commons-fileupload.version>
</properties>
<dependencies>
<!--starter begin-->
<!--spring cloud starter-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-consul-discovery</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-openfeign</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-zuul</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-sleuth</artifactId>
</dependency>
<!--tomcat starter-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.tomcat.embed</groupId>
<artifactId>tomcat-embed-jasper</artifactId>
<scope>compile</scope>
</dependency>
<!--actuator starter-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--spring boot starter-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<!--spring starter-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-aop</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-redis</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!--fastjon-->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>${fastjson.version}</version>
</dependency>
<dependency>
<groupId>io.github.openfeign</groupId>
<artifactId>feign-gson</artifactId>
<version>9.3.1</version>
</dependency>
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>commons-beanutils</groupId>
<artifactId>commons-beanutils</artifactId>
</dependency>
<dependency>
<groupId>commons-collections</groupId>
<artifactId>commons-collections</artifactId>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.4</version>
</dependency>
<dependency>
<groupId>com.netflix.feign</groupId>
<artifactId>feign-gson</artifactId>
<version>8.15.1</version>
</dependency>
</dependencies>
// Spring Cloud Finchley.RELEASE
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-dependencies</artifactId>
<version>Finchley.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
</project>
需要注意的地方：
- 部分依赖做了改变：
| 旧版本 | Finchley 版本 |
|---|---|
| spring-cloud-starter-eureka-client | spring-cloud-starter-netflix-eureka-client |
| spring-cloud-starter-eureka-server | spring-cloud-starter-netflix-eureka-server |
| spring-cloud-starter-hystrix | spring-cloud-starter-netflix-hystrix |
| spring-cloud-starter-hystrix-dashboard | spring-cloud-starter-netflix-hystrix-dashboard |
| spring-cloud-starter-ribbon | spring-cloud-starter-netflix-ribbon |
| spring-cloud-starter-turbine | spring-cloud-starter-netflix-turbine |
| spring-cloud-starter-zuul | spring-cloud-starter-netflix-zuul |
| spring-cloud-starter-feign | spring-cloud-starter-openfeign |
新版本的 SpringCloud 上面的依赖都发生了变化，依赖中都引入了 netflix，或许是为了声明吧（组件的实现底层并非spring）。
- log4j依赖：
在spring cloud之前的版本中，日志只需要引入lombok即可，但是Finchley版本需要单独的引用。
<!--lombok-->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
2）集成consul配置文件：
spring:
application:
name: sc-saturn
profiles:
active: dev
cloud:
config:
# uri: http://localhost:9999
discovery:
enabled: false
serviceId: sc-earth-config-server
label: master
profile: pre
consul:
host: http://localhost:8500
port: 80
discovery:
prefer-ip-address: true
#这里是重写健康检查的endPoint，默认为 /health，重写是为了节省不必要的网络传输，只需要http 200状态码即可
health-check-path: /ok/health
heartbeat:
enabled: false
3）启动类：
@SpringBootApplication
@EnableFeignClients
@EnableZuulServer
@ComponentScan(basePackages={"com.iyb.ak"})
@EnableDiscoveryClient
@Slf4j
public class SaturnApplication implements CommandLineRunner{
public static void main(String[] args) {
SpringApplication.run(SaturnApplication.class, args);
}
@Override
public void run(String... args) throws Exception {
log.info(">>>>>>>>>>>>>>> sc-saturn 启动完成<<<<<<<<<<<<<");
}
}
4）示例：
注册中心：
可以看到 sc-saturn 已经成功注册到 consul中了。另外，上面的consul ui界面发生了变化，这是1.2版本做出的优化，相较以前的ui界面，已经好看很多了。