用Java得到Excel中Formula的值

　　 　　工具1：POI
　　POI是常用的读取Office文件的开源工具。但是在它正式发布的版本中没有提供得到Excel中Formula值的功能。
　　这个POI还在开发中的功能。相关信息 请看http://jakarta.apache.org/poi/hssf/eval.Html
　　
　　工具2：JExcelAPI
　　Java Excel API - A Java API to read, write, and modify Excel spreadsheets
　　http://jexcelapi.sourceforge.net/
　　目前的最新版本是2.6 
　　
　　Some Features
　　* Reads data from Excel 95, 97, 2000, XP, and 2003 workbooks
　　* Reads and writes formulas (Excel 97 and later only)
　　* Generates spreadsheets in Excel 2000 format
　　* Supports font, number and date formatting
　　* Supports shading, bordering, and coloring of cells
　　* Modifies existing worksheets
　　* Is internationalized, enabling processing in almost any locale, country, language, or character encoding (formulas are currently only supported in English, French, * * Spanish, and German, but more can be added if translated)
　　* Supports copying of charts
　　* Supports insertion and copying of images into spreadsheets
　　* Supports logging with Jakarta Commons Logging, log4j, JDK 1.4 Logger, etc
　　...and mUCh more