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 fr a mework, 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.