http://www.blogjava.net/jayslong/archive/2011/04/21/convert_xls_and_xlsx_to_csv.html 

分享用Java将Excel的xls和xlsx文件转换成csv文件的方法, XLS2CSV, XLSX2CSV 

依赖的包主要是Apache的POI包,Maven的pom文件给大家

http://hc.apache.org/ 

The Apache HttpComponents™ project is responsible for creating and maintaining a toolset of low level Java components focused on HTTP and associated protocols.

httpclient 解析excel