This looks like an operation that should use an RPC. This may help you: http://roberthanson.blogspot.com/2006/06/trivial-gwt-example.html
On Mar 24, 1:06 pm, vroom_vroom <[email protected]> wrote: > Hello, I know this topic has been discussed in a few threads. I have > attempted to ask my questions in those but for some reason they are > not posting, so I had to create this new one. I read documentation and > other posts but still confused on how to do this. File download is > very simple in normal web app, but having trouble in GWT. Can someone > please help me with what I have written here? > > This is code for client side : > [CODE] > private void exportToExcel() { > final int STATUS_CODE_OK = 200; > final String url = "/exportExcel"; > RequestBuilder builder = new RequestBuilder(RequestBuilder.GET, > url); > > try { > Request response = builder.sendRequest(null, new RequestCallback > () { > public void onError(Request request, Throwable exception) { > // TODO: > } > > public void onResponseReceived(Request request, Response > response) { > // TODO: > } > > }); > } catch (RequestException e) { > // TODO: > } > } > [/CODE] > > This is in the ***.gwt.xml file: > [CODE] > <inherits name="com.google.gwt.http.HTTP" /> > <servlet path="/exportExcel" > class="com.myweb.server.ExportExcelServlet" /> > [/CODE] > > This is my servlet: > [CODE] > package com.myweb.server; > > import java.io.ByteArrayInputStream; ... > > public class ExportExcelServlet extends HttpServlet { > > public void doGet(HttpServletRequest request, > HttpServletResponse response) > throws ServletException, IOException { > > response.setContentType("application/download"); > response.setHeader("Content- > Disposition","attachment;filename=temp.csv"); > > try { > StringBuffer sb = generateCsvFileBuffer(); > InputStream in = new > ByteArrayInputStream(sb.toString().getBytes > ("UTF-8")); > ServletOutputStream out = response.getOutputStream(); > > byte[] outputByte = new byte[4096]; > //copy binary contect to output stream > while(in.read(outputByte, 0, 4096) != -1) > { > out.write(outputByte, 0, 4096); > } > in.close(); > out.flush(); > out.close(); > } catch (Exception e) { > // TODO Auto-generated catch block > e.printStackTrace(); > } > > } > > public void doPost(HttpServletRequest request, > HttpServletResponse response) > throws ServletException, IOException { > doGet(request,response); > } > > private static StringBuffer generateCsvFileBuffer() > { > StringBuffer writer = new StringBuffer(); > > writer.append("DisplayName"); > writer.append(','); > writer.append("Age"); > writer.append('\n'); > > writer.append("your name"); > writer.append(','); > writer.append("30"); > writer.append('\n'); > > return writer; > }} > > [/CODE] > > At first I was having no errors generated but in the browser no > download dialog would pop up, and nothing happened. > I changed something...not sure what now, and getting runtime errors. > [ERROR] Unable to find 'exportExcel.gwt.xml' on your classpath; could > be a typo, or maybe you forgot to include a classpath entry for > source? > > My entire app is written in GWT, so I dont have a web.xml file > > I am very stuck any help would be extreemly appreciated > 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] For more options, visit this group at http://groups.google.com/group/Google-Web-Toolkit?hl=en -~----------~----~----~----~------~----~------~--~---
