JPA高级篇,2个子目录包含原文中相关章节所有源码，每个子目录包含一个build.xml文件，一个src目录包含源码和persistence.xml文件。-This code illustrates the second article about JPA. You will find 2 sub-directories that contain the code that changes throughout the article. In each sub-directory yo

dom4j是一个Java的XML API，类似于jdom，用来读写XML文件的。dom4j是一个非常非常优秀的Java XML API，具有性能优异、功能强大和极端易用使用的特点，同时它也是一个开放源代码的软件(Dom4j is a Java XML API, similar to JDOM, used to read and write XML files. Dom4j is a very, very good Java XML API, which is excellent in perfo