Handle File Upload

WebWind supports file upload by integration of Commons FileUpload. You don't need any configuration but just place the commons-fileupload-1.2.x.jar into /WEB-INF/lib/. File upload feature is disabled if commons-fileupload cannot be found under /WEB-INF/lib/.

It is very simple to handle file upload:

public class FileUpload {
    @Mapping("/fileupload")
    public String post() throws Exception {
        HttpServletRequest request = ActionContext.getActionContext().getHttpServletRequest();
        if (request instanceof MultipartHttpServletRequest) {
            MultipartHttpServletRequest multipartRequest = (MultipartHttpServletRequest) request;
            // we are assume that file is uploaded with field name 'myfile':
            String filename = multipartRequest.getFileName("myfile");
            // now get file name like 'C:\WINDOWS\Notepad.ini'...
            InputStream input = multipartRequest.getFileInputStream("myfile");
            // TODO: read file content here...
            input.close();
            return "redirect:/upload-success.htm";
        }
        throw new IOException("Not a multipart request!");
    }
}

Normal form fields can still be retrieved by HttpServletRequest.getParameter(String).

NOTE that WebWind only supports Commons FileUpload 1.2.0 or above.