So far.. I have a servlet that can gets image from database and another server that can store image in the database. I am familiar with RPC calls. However, I dont know how to make this two servlet work in my gwt project.
I am guessing there is stuff need to be change in xml file. Is can anyone guide me further please! On Apr 23, 10:48 am, KK <[email protected]> wrote: > Hello, > Thank you for your response. I am a step closer. > > Since I am using two servlets (foruploadand download) of theimage. > do I need to make any changes in .gwt.xml or web.xml file? > > thanks > > On Apr 21, 6:34 am, ahmet terzioglu <[email protected]> wrote: > > > > > Hi, > > > First of all, I don't save my images in the database, they are saved on the > > web server. Basically you need two http servlets, one for download and one > > forupload. (Maybe you can do it with only one by just using GET and POST > > but anyway...) > > > For uploading I use a fileUploader widget inside a form. A submit button > > triggers uploadForm.submit() and the file sent to the httpServlet. > > > uploadForm.setEncoding(FormPanel.Encoding.MULTIPART); > > uploadForm.setMethod(FormPanel.Method.POST); > > uploadForm.setAction(GWT.getModuleBaseURL() +"ServletUpload"); > > ... > > > The http servlet request is parsed to get the file and write it to the > > webserver. I save my files in directories inside the WEB-INF folder because > > it is private. > > FileItemFactory factory = new DiskFileItemFactory(); > > ServletFileUploadupload= new ServletFileUpload(factory); > > List items =upload.parseRequest(req); > > ... > > > For downloading all you need is an html img tag calling your downloadServlet > > > String serviceCall = GWT.getModuleBaseURL() > > +"ServletDownload?url="+Constants.DOWNLOADPATH+fileName; > > html.setHTML("<img src=\""+serviceCall+"\" />"); > > > In your httpServlet for download, you take the url paramater from the > > response, find the resource and then stream back to the browser as a > > response using the ServletOutputStream: > > > String urlString = request.getParameter("url"); > > response.setContentType("image/jpg"); > > ServletOutputStream out = resp.getOutputStream(); > > URL url = getServletContext().getResource(urlString); > > ... > > > By using this approach you can stream animagein a private folder by using > > the servlet call in the html tag to serve theimage. > > Hope this helps... > > For more info you can investigate the concepts mentioned Trevis's and > > Subhro's posts. > > > Ahmet > > > On Wed, Apr 21, 2010 at 7:55 AM, KK <[email protected]> wrote: > > > Can you please show an example code .. how you made this work? > > > > Thanks! > > > > -- > > > You received this message because you are subscribed to the Google Groups > > > "Google Web Toolkit" group. > > > To post to this group, send email to [email protected]. > > > To unsubscribe from this group, send email to > > > [email protected]<google-web-toolkit%[email protected]> > > > . > > > For more options, visit this group at > > >http://groups.google.com/group/google-web-toolkit?hl=en. > > > -- > > You received this message because you are subscribed to the Google Groups > > "Google Web Toolkit" group. > > To post to this group, send email to [email protected]. > > To unsubscribe from this group, send email to > > [email protected]. > > For more options, visit this group > > athttp://groups.google.com/group/google-web-toolkit?hl=en. > > -- > You received this message because you are subscribed to the Google Groups > "Google Web Toolkit" group. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group > athttp://groups.google.com/group/google-web-toolkit?hl=en. -- You received this message because you are subscribed to the Google Groups "Google Web Toolkit" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/google-web-toolkit?hl=en.
