Hello,

My EGL class student is asking a RUI sample from which user can download files( setup instruction, readme ).  

Very appreciate for any sample code or coding guidance.    

I have solved this by creating a servlet with context parameters.

I have an RUI external type function to open a link in a remote browser window. I can call this externaltype function from RUI with a link I create.

This link goes to the servlet contains a parameter with the id of the file.

The servlet consumes a web service to retrieve the file details from the database with the id of the file, and returns the file.

The externaltype javascript code:

egl.defineClass(        'customJavaScript.widgets', 'BrowserFuncts',                                    {                     "eze$$initializeDOMElement": function(){                                        },                "constructor": function(){                        //theWidget=this;                },                "openWindow" : function (windowURL, options) {                        m = window.open(windowURL,'_blank',options);                         return true;                }});                

The egl externaltype code:

package externalTypes;delegate EndPageEvent()endexternalType BrowserFunctions extends Widget type JavaScriptObject {                relativePath = "customJavaScript/widgets",                javaScriptName = "BrowserFuncts"         }                function openWindow(windowURL string in, options string in);end

The code to use the openWindow function (from within the handler or the widget)

                link string = "http://as400server:10021/PdfServices/getFile?fileID=" + id;                Browserfuncties BrowserFunctions = new Browserfunctions();                    browserFuncties.openWindow(link, "");

And the servlet:

package com.molcy.java.servlets.file;import java.io.BufferedInputStream;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.math.BigDecimal;import java.rmi.RemoteException;import java.util.Random;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import javax.xml.rpc.ServiceException;import com.molcy.java.util.PathUtils;import com.molcy.webservices.Services.BestandService;import com.molcy.webservices.Services.BestandServiceServiceLocator;import com.molcy.webservices.UIRecords.UIBestandRec;/* * Dit zorgt ervoor dat het mime type goed staat.  * Indien "Content-Disposition" als attachment staat, kan je in firefox niet automatisch openen.  * getfile zal dus altijd met dialoogvenster zijn en zal de bestandsnaam correct zijn  * getfilemime kan de browser kijken hoe hij het behandelt en zal de bestandsnaam getfile zijn *  */public class getFile extends HttpServlet {        private static final long serialVersionUID = 1L;           public getFile() {        super();        // TODO Auto-generated constructor stub    }        protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {        int fileID = Integer.parseInt(request.getParameter("fileID"));                BestandServiceServiceLocator blocator = new BestandServiceServiceLocator();                try {                        BestandService bserv = blocator.getBestandService();                        UIBestandRec bestRec = bserv.getBestand(new BigDecimal(fileID));                        String extension = PathUtils.getExtension(bestRec.getPad());                        Random generator = new Random();                        int i = generator.nextInt();                         if (i < 0) i = i * -1;                        //String ct = PathUtils.getMimeType(bestRec.getOrigBestandNaam()+ "." + extension);             response.addHeader("Content-Disposition", "attachment; filename=\"" + bestRec.getOmschr().trim() + "-" + i + "." + extension + "\"");            response.setContentType(PathUtils.getMimeType(bestRec.getOrigBestandNaam()));            File f = new File(PathUtils.movePathToQNC(bestRec.getPad()));            BufferedInputStream in = new BufferedInputStream(new FileInputStream(f));            int len;            byte[] buf = new byte[1024];            while ((len = in.read(buf)) > 0){                response.getOutputStream().write(buf, 0, len);            }            in.close();            response.getOutputStream().close();                } catch (RemoteException e){                        System.out.println("Servlet getFile: Fout bij ophalen bestandsdetails voor bestand met id " + fileID + " " + e.getMessage());                       } catch (ServiceException servEx){                        System.out.println("Servlet getFile: Fout bij instellen service " + servEx.getMessage());                     }                    }        protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {                // TODO Auto-generated method stub        }}

I have just copied the code as it works for me.

It might be too complex for your needs.

Kind regards,

Bram

Hi,

we have a similar servlet.

package servlet;import java.io.File;import java.io.FileInputStream;import java.io.IOException;import java.io.OutputStream;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class DownloadFileServlet extends HttpServlet {        protected void doGet(HttpServletRequest request,                        HttpServletResponse response) throws ServletException, IOException {                request.setCharacterEncoding("UTF-8");                final String fileName = request.getParameter("file");                // reads input file from an absolute path                String filePath = fileName;                File downloadFile = new File(filePath);                FileInputStream inStream = new FileInputStream(downloadFile);                // if you want to use a relative path to context root:                String relativePath = getServletContext().getRealPath("");                System.out.println("relativePath = " + relativePath);                // obtains ServletContext                ServletContext context = getServletContext();                // gets MIME type of the file                String mimeType = context.getMimeType(filePath);                if (mimeType == null) {                        // set to binary type if MIME mapping not found                        mimeType = "application/octet-stream";                }                System.out.println("MIME type: " + mimeType);                // modifies response                response.setContentType(mimeType);                response.setContentLength((int) downloadFile.length());                // forces download                String headerKey = "Content-Disposition";                String headerValue = String.format("attachment; filename=\"%s\"",                                downloadFile.getName());                response.setHeader(headerKey, headerValue);                // obtains response's output stream                OutputStream outStream = response.getOutputStream();                byte[] buffer = new byte[4096];                int bytesRead = -1;                while ((bytesRead = inStream.read(buffer)) != -1) {                        outStream.write(buffer, 0, bytesRead);                }                inStream.close();                outStream.close();        }}