一个简单的使用 Servlet 的 Java 服务端应用，打成 war 包运行。 可以运行在 LeanEngine Java 运行时环境。
首先确认本机已经安装 LeanCloud 命令行工具，然后执行下列指令：
$ git clone https://github.com/leancloud/java-war-getting-started.git
$ cd java-war-getting-started
安装依赖：
mvn package
登录账户：
lean login
关联项目：
lean checkout
根据列表提示，输入数字，依次按回车确认，以关联到你的应用。
启动项目：
lean up
应用即可启动运行：localhost:3000
部署到预备环境（若无预备环境则直接部署到生产环境）：
lean deploy
将预备环境的代码发布到生产环境：
lean publish
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