File upload

Single file upload:
1: reference
   commmons-fileupload-1.2.1.jar
2: <form enctype="multipart/form-data">
      <input type="file" name="uploadFile"/>
   </form>
3: create action
   This action should contain three properties corresponding to the "uploadFile" property in the form.
   (1)File uploadFile;
   (2)String uploadFileContentType;
   (3)String uploadFileFileName;

Multi file upload:
1: reference
   commmons-fileupload-1.2.1.jar
2: <form enctype="multipart/form-data">
      <input type="file" name="uploadFile"/>
      <input type="file" name="uploadFile"/>
   </form>
3: create action
   This action should contain three properties corresponding to the "uploadFile" property in the form.
   (1)File[] uploadFile;
   (2)String[] uploadFileContentType;
   (3)String[] uploadFileFileName;