[jboss-user] [JBoss Portal] - Re: Downloading a File from within a Portlet.

[yacoobkb]

Hi,

Iam struck up with this issue for the past two days any help will be greatly appreciated.

I have a JSF(xhtml) with the following command link 


  | 			<a4j:commandLink action="#{navigateBean.downloadPDF}"
  | 				value="View PDF"></a4j:commandLink>
  | 

Clicking the View PDF should call the bean and the downloadPDF method will call a servlet 

Bean code:

  | 
  | package com.portal.tata.beans;
  | 
  | import javax.faces.context.FacesContext;
  | 
  | import org.jboss.seam.ScopeType;
  | import org.jboss.seam.annotations.Logger;
  | import org.jboss.seam.annotations.Name;
  | import org.jboss.seam.annotations.Scope;
  | import org.jboss.seam.log.Log;
  | 
  | /**
  |  * Created by IntelliJ IDEA. User: bharat Date: Sep 27, 2007 Time: 10:30:58 AM
  |  * To change this template use File | Settings | File Templates.
  |  */
  | 
  | @Name("navigateBean")
  | @Scope(ScopeType.SESSION)
  | public class NavigateBean {
  | 
  | 	@Logger
  | 	static Log log;
  | 
  | 	String linkType = "";
  | 
  | 	public String getLinkType() {
  | 		return linkType;
  | 	}
  | 
  | 	public void setLinkType(String linkType) {
  | 		log.info("setLinkType", linkType);
  | 		this.linkType = linkType;
  | 	}
  | 
  | 	public String delegateReq() {
  | 		log.info("linkType", linkType);
  | 		return linkType;
  | 	}
  | 
  | 	public String forward() {
  | 		System.out.println("Check............");
  | 		log.info("forward", "forward this");
  | 		return "done";
  | 	}
  | 
  | 	public String downloadPDF() {
  | 		System.out.println("NavigateBean.downloadPDF()..........");
  | 		// We must get first our context
  | 
  | 		String url = "/servlet/downloadservlet?fileName=Reports.pdf";
  | 		FacesContext context = FacesContext.getCurrentInstance();
  | 
  | 		try {
  | 			context.getExternalContext().dispatch(url);
  | 		} catch (Exception e) {
  | 			e.printStackTrace();
  | 		} finally {
  | 			context.responseComplete();
  | 		}
  | 		return "success";
  | 	}
  | }
  | 
  | 

Servlet code:


  | 
  | package com.portal.tata;
  | 
  | import javax.servlet.http.HttpServlet;
  | import javax.servlet.ServletOutputStream;
  | import javax.servlet.http.HttpServletRequest;
  | import javax.servlet.http.HttpServletResponse;
  | import java.io.File;
  | import java.io.PrintWriter;
  | import java.io.FileInputStream;
  | import java.io.IOException;
  | 
  | public class DownloadServlet extends HttpServlet {
  | 
  | 	public void doPost(HttpServletRequest request, HttpServletResponse response)
  | 			throws IOException {
  | 		doGet(request, response);
  | 	}
  | 
  | 	public void doGet(HttpServletRequest request, HttpServletResponse response)
  | 			throws IOException {
  | 		System.out.println("DownloadServlet.doGet()");
  | 		String fileName = request.getParameter("fileName");
  | 		System.out.println("fileName==="+fileName);
  | 		if (fileName == null) {
  | 			response.setContentType("text/html");
  | 			PrintWriter writer = response.getWriter();
  | 			writer.print("<h2>No fileName get parameter was passed</h2>");
  | 			writer.close();
  | 			return;
  | 		}
  | 		try {
  | 			File newFile = new File(fileName);
  | 			System.out.println("newFile.isFile()::"+newFile.isFile());
  | 			System.out.println("path::"+newFile.getAbsolutePath());
  | 			
  | 			FileInputStream in = new FileInputStream(newFile);
  | 			ServletOutputStream out = response.getOutputStream();			
  | 			response.setContentType("application/pdf");
  | 			response.setContentLength((int) newFile.length());
  | 			response.setHeader("Content-Disposition", "attachment;filename="+fileName);
  | 			
  | 			for (int i = in.read(); i != -1; i = in.read()) {
  | 				out.write(i);
  | 			}
  | 			in.close();
  | 			out.flush();
  | 			out.close();
  | 			System.out.println("========================================");
  | 		} catch (Exception e) {
  | 			e.printStackTrace();
  | 			response.setContentType("text/html");
  | 			PrintWriter writer = response.getWriter();
  | 			writer.print("<h2>Sorry, that file cannot befound </h2>");
  | 			writer.close();
  | 		}
  | 	}
  | }
  | 


What is happening is on clicking the link the browser shows the junk character of the pdf instead of opening a pop-up save dialog box.

Thanks
Yacoob



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