百度文库
http://wenku.baidu.com/link?url=B7WZsrNRh9AXPCYT-pj0kaHlZwwPhyKr3QZSF4iLq21Krf4sP5SpOZjV7r9JhHycrWJf1F2wHE1rpPJYOSjP3M2k5SALrj-UGWThIKxp-ky
runoob:
http://www.runoob.com/jsp/jsp-file-uploading.html
原文：http://www.cnblogs.com/czclaire/p/4919598.html