使用DOM操作XML比较简单，但是耗资源太多，使用SAX复杂，但是性能优秀，而JDOM则有这两种优势。(注意下载JDOM包)-use XML DOM operation is relatively simple, but too many resources consumption, the use of SAX complex, but excellent performance, and JDOM has two advantages. (Note that the download JDOM package)