代码功能：文件上传，利用输入流的方式 实现文件选取及上传，工程需安放在Myeclipse或Eclipse环境下，除了基本的jar包外，还需添加commons-io-2.4.jar和 commons-fileupload-1.2.2.jar两个包- Code Function: file upload, use patterns of the input stream for file upload, the project should be established under myec