Quartz是一个开源的作业调度框架，它完全由Java写成，并设计用于J2SE和J2EE应用中。它提供了巨大的灵 活性而不牺牲简单性。你能够用它来为执行一个作业而创建简单的或复杂的调度。它有很多特征，如：数据库支持，集群，插件，EJB作业预构 建，JavaMail及其它，支持cron-like表达式等等。-Quartz is an open source job scheduling framework, it is entirely written in Java and designed for the J2SE and J2EE applications. It provides great flexibility without sacrificing simplicity. You can use it to execute a job and to create simple or complex scheduling. It has many features, such as: database support, cluster, plug-ins, EJB operations pre-built, JavaMail and other support cron-like expressions.