实践JDK内置工具之JConsole
实践ActiveMQ之连接
连接工厂
实践ActiveMQ之消费者
TaskRunner首先会循环一轮调用消费者（有配置MessageListener且从自己的MessageDispatchChannel读取消息）进行消费，然后从ActiveMQSessionExecutor的MessageDispatchChannel中读取消息调用消费者进行消费。
实践RxJava
RxJava is a Java VM implementation of Reactive Extensions: a library for composing asynchronous and event-based programs by using observable sequences.
实践Java日志框架
实践数字证书
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工具集
KeyStore Explorer is an open source GUI replacement for the Java command-line utilities keytool and jarsigner. KeyStore Explorer presents their functionality, and more, via an intuitive graphical user interface.
实践数据库连接池之Druid
Druid是为监控而生的数据库连接池！