确定稳定的 Spring Cloud 相关环境版本
开发部署 Spring Cloud 微服务框架，需要先确定 Spring Cloud 的相关环境版本，主要包含：Spring Cloud、Spring Cloud Netflix、JDK、JRE、Java Version等相关版本，以及环境的配置。
现在最新版本 Java 10、Spring Boot 2.0、Spring Cloud Finchley.M9，但这些版本还不太稳定，而且相关的兼容也不是很好，问题的解决方案也比较少。
今天花了大概一天的时间，尝试了各种版本的兼容，以及使用部署的问题，最终确定了下面这套版本，比较相对稳定。
- Spring Cloud：Edgware.SR3（http://projects.spring.io/spring-cloud/），和 Spring Boot 版本关联，可在官网进行查看。
- Spring Cloud Netflix：1.4.4.RELEASE
- Spring Boot：1.5.10.RELEASE
- JDK：Java SE Development Kit 8u162（http://www.oracle.com/technetwork/java/javase/downloads/jdk8-downloads-2133151.html），也就是 jdk1.8.0_162。
- JRE：Server JRE (Java SE Runtime Environment) 8u161（http://www.oracle.com/technetwork/java/javase/downloads/server-jre8-downloads-2133154.html）
- Java Version：1.8，和 JDK 对应，
如果使用其他版本的话，会出现一些问题，比如下面：
- SpringCloud异常(Euruka)：Application run failed java.lang.NoSuchMethodError: org.springframework.boot.builder.SpringApplicationBuilder
- How to resolve java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException in Java 9
- com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused: connect
- java.lang.NoClassDefFoundError: javax/activation/DataHandler
- Unable to start embedded container; nested exception is org.springframework.boot.context.embedded.EmbeddedServletContainerException: Unable to start embedded Tomcat
服务器配置 JRE 环境
使用 wget 命令，在官网下载对应的 Server JRE。
创建安装目录：
$ sudo mkdir -p /usr/local/java解压文件到指定目录：
$ sudo tar -zxvf serverjre-9.0.1_linux-x64_bin.tar.gz -C /usr/local/java/ --strip-components=1编辑配置文件：
$ sudo vi /etc/profile将下面配置添加到配置文件中：
# JRE configuration
export JAVA_HOME=/usr/local/java
export JRE_HOME=${JAVA_HOME}
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
# End JDK configuration生效及测试：
$ source /etc/profile
$ java -versionMac 配置 JDK 环境
在官网下载对应的 Mac JDK 版本。
直接安装成功后（目录：/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk）。
编辑配置文件：
$ sudo vi /etc/profile将下面配置添加到配置文件中：
# JDK configuration
export JAVA_HOME=/Library/Java/JavaVirtualMachines/jdk1.8.0_162.jdk/Contents/Home
export JRE_HOME=${JAVA_HOME}
export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
export PATH=${JAVA_HOME}/bin:$PATH
# End JDK configuration生效及测试：
$ source /etc/profile
$ java -versionIntelliJ IDEA 选择添加 JDK 即可：
IntelliJ IDEA 修改当前项目的 JDK 版本：
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