Spring boot 版本为 2.0.2.RELEASE
Spring Cloud 版本为 Finchley.RC2
启动报错信息如下（查看控制台最下面）：
2018-06-14 09:09:19.104 INFO 10436 --- [ Thread-16] com.netflix.discovery.DiscoveryClient : Shutting down DiscoveryClient ...
2018-06-14 09:09:19.139 INFO 10436 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_UNKNOWN/DESKTOP-T39T2VU - registration status: 204
2018-06-14 09:09:19.140 INFO 10436 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_UNKNOWN/DESKTOP-T39T2VU: registering service...
2018-06-14 09:09:19.148 INFO 10436 --- [nfoReplicator-0] com.netflix.discovery.DiscoveryClient : DiscoveryClient_UNKNOWN/DESKTOP-T39T2VU - registration status: 204
2018-06-14 09:09:19.149 INFO 10436 --- [ Thread-16] com.netflix.discovery.DiscoveryClient : Unregistering ...
2018-06-14 09:09:19.158 INFO 10436 --- [ Thread-16] com.netflix.discovery.DiscoveryClient : DiscoveryClient_UNKNOWN/DESKTOP-T39T2VU - deregister status: 200
2018-06-14 09:09:19.167 INFO 10436 --- [ Thread-16] com.netflix.discovery.DiscoveryClient : Completed shut down of DiscoveryClient
2018-06-14 09:09:19.168 INFO 10436 --- [ Thread-16] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans on shutdown
2018-06-14 09:09:19.168 INFO 10436 --- [ Thread-16] o.s.j.e.a.AnnotationMBeanExporter : Unregistering JMX-exposed beans
Disconnected from the target VM, address: '127.0.0.1:53512', transport: 'socket'
Process finished with exit code 0
在pom文件中引入如下
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
添加完后重启就好了。