Giving download option to user for a file at a particular location on Application Server

Hi All,
This is a very generic scenario where a user wants to download a particular file from application server. eg- We are storing some report output or some pdf documents in particular location in unix application server. Now in a OAF page on press of a button/link I wanna give user download option for this file.

For this requirement you can use following method, from process form request, u need to pass pagecontext and other parameters as described in method.

//on button click in process form request
//call this method
downloadFileFromServer(
pageContext,--pagecontext
"/xx/xxx/ssss/120devg.pdf",--full file path with file name and ext
"120devg.pdf" --file name with extension
);

Make sure that the folder/files you are giving user option to download through this method, have 777 rights in UNIX server.

Copy these two methods in your CO for the above API to work:
/**
* @param pageContext the current OA page context
* @param file_name_with_path - this is fully qualified file name with its path on unix application
* server. eg "/xxcrp/xxapplcrp/mukul/abc.pdf"
* @param file_name_with_ext - this is file name with extension, you wanna display user
* for download. eg- i wanna display the abc.pdf file download with name five_point_someone.pdf
* then I can pass this as "five_point_someone.pdf"
*/
public void downloadFileFromServer(OAPageContext pageContext,
String file_name_with_path,
String file_name_with_ext)
{
HttpServletResponse response =
(HttpServletResponse) pageContext.getRenderingContext().getServletResponse();
if (((file_name_with_path == null) ||
("".equals(file_name_with_path))))
{
throw new OAException("File path is invalid.");
}

File fileToDownload = null;
try
{
fileToDownload = new File(file_name_with_path);
}
catch (Exception e)
{
throw new OAException("Invalid File Path or file does not exist.");
}

if (!fileToDownload.exists())
{
throw new OAException("File does not exist.");
}

if (!fileToDownload.canRead())
{
throw new OAException("Not Able to read the file.");
}

String fileType = getMimeType(file_name_with_ext);
response.setContentType(fileType);
response.setContentLength((int)fileToDownload.length());
response.setHeader("Content-Disposition",
"attachment; filename=\"" + file_name_with_ext +
"\"");

InputStream in = null;
ServletOutputStream outs = null;

try
{
outs = response.getOutputStream();
in = new BufferedInputStream(new FileInputStream(fileToDownload));
int ch;
while ((ch = in.read()) != -1)
{
outs.write(ch);
}

}
catch (IOException e)
{
// TODO
e.printStackTrace();
}
finally
{
try
{
outs.flush();
outs.close();
if (in != null)
{
in.close();
}
}
catch (Exception e)
{
e.printStackTrace();
}
}
}

/**
* @param s
* @return file mime type from its name
*/
public String getMimeType(String s)
{
int i = s.lastIndexOf(".");
if (i > 0 && i < s.length() - 1)
{
String s1 = s.substring(i + 1);
if (s1.equalsIgnoreCase("amr"))
{
return "audio/amr";
}
if (s1.equalsIgnoreCase("mid"))
{
return "audio/midi";
}
if (s1.equalsIgnoreCase("mmf"))
{
return "application/vnd.smaf";
}
if (s1.equalsIgnoreCase("qcp"))
{
return "audio/vnd.qcelp";
}
if (s1.equalsIgnoreCase("hqx"))
{
return "application/mac-binhex40";
}
if (s1.equalsIgnoreCase("cpt"))
{
return "application/mac-compactpro";
}
if (s1.equalsIgnoreCase("doc"))
{
return "application/msword";
}
if (s1.equalsIgnoreCase("jsp"))
{
return "application/jsp";
}
if (s1.equalsIgnoreCase("oda"))
{
return "application/oda";
}
if (s1.equalsIgnoreCase("pdf"))
{
return "application/pdf";
}
if (s1.equalsIgnoreCase("ai"))
{
return "application/postscript";
}
if (s1.equalsIgnoreCase("eps"))
{
return "application/postscript";
}
if (s1.equalsIgnoreCase("ps"))
{
return "application/postscript";
}
if (s1.equalsIgnoreCase("ppt"))
{
return "application/powerpoint";
}
if (s1.equalsIgnoreCase("rtf"))
{
return "application/rtf";
}
if (s1.equalsIgnoreCase("bcpio"))
{
return "application/x-bcpio";
}
if (s1.equalsIgnoreCase("vcd"))
{
return "application/x-cdlink";
}
if (s1.equalsIgnoreCase("Z"))
{
return "application/x-compress";
}
if (s1.equalsIgnoreCase("cpio"))
{
return "application/x-cpio";
}
if (s1.equalsIgnoreCase("csh"))
{
return "application/x-csh";
}
if (s1.equalsIgnoreCase("dcr"))
{
return "application/x-director";
}
if (s1.equalsIgnoreCase("dir"))
{
return "application/x-director";
}
if (s1.equalsIgnoreCase("dxr"))
{
return "application/x-director";
}
if (s1.equalsIgnoreCase("dvi"))
{
return "application/x-dvi";
}
if (s1.equalsIgnoreCase("gtar"))
{
return "application/x-gtar";
}
if (s1.equalsIgnoreCase("gz"))
{
return "application/x-gzip";
}
if (s1.equalsIgnoreCase("hdf"))
{
return "application/x-hdf";
}
if (s1.equalsIgnoreCase("cgi"))
{
return "application/x-httpd-cgi";
}
if (s1.equalsIgnoreCase("jnlp"))
{
return "application/x-java-jnlp-file";
}
if (s1.equalsIgnoreCase("skp"))
{
return "application/x-koan";
}
if (s1.equalsIgnoreCase("skd"))
{
return "application/x-koan";
}
if (s1.equalsIgnoreCase("skt"))
{
return "application/x-koan";
}
if (s1.equalsIgnoreCase("skm"))
{
return "application/x-koan";
}
if (s1.equalsIgnoreCase("latex"))
{
return "application/x-latex";
}
if (s1.equalsIgnoreCase("mif"))
{
return "application/x-mif";
}
if (s1.equalsIgnoreCase("nc"))
{
return "application/x-netcdf";
}
if (s1.equalsIgnoreCase("cdf"))
{
return "application/x-netcdf";
}
if (s1.equalsIgnoreCase("sh"))
{
return "application/x-sh";
}
if (s1.equalsIgnoreCase("shar"))
{
return "application/x-shar";
}
if (s1.equalsIgnoreCase("sit"))
{
return "application/x-stuffit";
}
if (s1.equalsIgnoreCase("sv4cpio"))
{
return "application/x-sv4cpio";
}
if (s1.equalsIgnoreCase("sv4crc"))
{
return "application/x-sv4crc";
}
if (s1.equalsIgnoreCase("tar"))
{
return "application/x-tar";
}
if (s1.equalsIgnoreCase("tcl"))
{
return "application/x-tcl";
}
if (s1.equalsIgnoreCase("tex"))
{
return "application/x-tex";
}
if (s1.equalsIgnoreCase("textinfo"))
{
return "application/x-texinfo";
}
if (s1.equalsIgnoreCase("texi"))
{
return "application/x-texinfo";
}
if (s1.equalsIgnoreCase("t"))
{
return "application/x-troff";
}
if (s1.equalsIgnoreCase("tr"))
{
return "application/x-troff";
}
if (s1.equalsIgnoreCase("roff"))
{
return "application/x-troff";
}
if (s1.equalsIgnoreCase("man"))
{
return "application/x-troff-man";
}
if (s1.equalsIgnoreCase("me"))
{
return "application/x-troff-me";
}
if (s1.equalsIgnoreCase("ms"))
{
return "application/x-troff-ms";
}
if (s1.equalsIgnoreCase("ustar"))
{
return "application/x-ustar";
}
if (s1.equalsIgnoreCase("src"))
{
return "application/x-wais-source";
}
if (s1.equalsIgnoreCase("xml"))
{
return "text/xml";
}
if (s1.equalsIgnoreCase("ent"))
{
return "text/xml";
}
if (s1.equalsIgnoreCase("cat"))
{
return "text/xml";
}
if (s1.equalsIgnoreCase("sty"))
{
return "text/xml";
}
if (s1.equalsIgnoreCase("dtd"))
{
return "text/dtd";
}
if (s1.equalsIgnoreCase("xsl"))
{
return "text/xsl";
}
if (s1.equalsIgnoreCase("zip"))
{
return "application/zip";
}
if (s1.equalsIgnoreCase("au"))
{
return "audio/basic";
}
if (s1.equalsIgnoreCase("snd"))
{
return "audio/basic";
}
if (s1.equalsIgnoreCase("mpga"))
{
return "audio/mpeg";
}
if (s1.equalsIgnoreCase("mp2"))
{
return "audio/mpeg";
}
if (s1.equalsIgnoreCase("mp3"))
{
return "audio/mpeg";
}
if (s1.equalsIgnoreCase("aif"))
{
return "audio/x-aiff";
}
if (s1.equalsIgnoreCase("aiff"))
{
return "audio/x-aiff";
}
if (s1.equalsIgnoreCase("aifc"))
{
return "audio/x-aiff";
}
if (s1.equalsIgnoreCase("ram"))
{
return "audio/x-pn-realaudio";
}
if (s1.equalsIgnoreCase("rpm"))
{
return "audio/x-pn-realaudio-plugin";
}
if (s1.equalsIgnoreCase("ra"))
{
return "audio/x-realaudio";
}
if (s1.equalsIgnoreCase("wav"))
{
return "audio/x-wav";
}
if (s1.equalsIgnoreCase("pdb"))
{
return "chemical/x-pdb";
}
if (s1.equalsIgnoreCase("xyz"))
{
return "chemical/x-pdb";
}
if (s1.equalsIgnoreCase("gif"))
{
return "image/gif";
}
if (s1.equalsIgnoreCase("ief"))
{
return "image/ief";
}
if (s1.equalsIgnoreCase("jpeg"))
{
return "image/jpeg";
}
if (s1.equalsIgnoreCase("jpg"))
{
return "image/jpeg";
}
if (s1.equalsIgnoreCase("jpe"))
{
return "image/jpeg";
}
if (s1.equalsIgnoreCase("png"))
{
return "image/png";
}
if (s1.equalsIgnoreCase("tiff"))
{
return "image/tiff";
}
if (s1.equalsIgnoreCase("tif"))
{
return "image/tiff";
}
if (s1.equalsIgnoreCase("ras"))
{
return "image/x-cmu-raster";
}
if (s1.equalsIgnoreCase("pnm"))
{
return "image/x-portable-anymap";
}
if (s1.equalsIgnoreCase("pbm"))
{
return "image/x-portable-bitmap";
}
if (s1.equalsIgnoreCase("pgm"))
{
return "image/x-portable-graymap";
}
if (s1.equalsIgnoreCase("ppm"))
{
return "image/x-portable-pixmap";
}
if (s1.equalsIgnoreCase("rgb"))
{
return "image/x-rgb";
}
if (s1.equalsIgnoreCase("xbm"))
{
return "image/x-xbitmap";
}
if (s1.equalsIgnoreCase("xpm"))
{
return "image/x-xpixmap";
}
if (s1.equalsIgnoreCase("xwd"))
{
return "image/x-xwindowdump";
}
if (s1.equalsIgnoreCase("html"))
{
return "text/html";
}
if (s1.equalsIgnoreCase("htm"))
{
return "text/html";
}
if (s1.equalsIgnoreCase("txt"))
{
return "text/plain";
}
if (s1.equalsIgnoreCase("rtx"))
{
return "text/richtext";
}
if (s1.equalsIgnoreCase("tsv"))
{
return "text/tab-separated-values";
}
if (s1.equalsIgnoreCase("etx"))
{
return "text/x-setext";
}
if (s1.equalsIgnoreCase("sgml"))
{
return "text/x-sgml";
}
if (s1.equalsIgnoreCase("sgm"))
{
return "text/x-sgml";
}
if (s1.equalsIgnoreCase("mpeg"))
{
return "video/mpeg";
}
if (s1.equalsIgnoreCase("mpg"))
{
return "video/mpeg";
}
if (s1.equalsIgnoreCase("mpe"))
{
return "video/mpeg";
}
if (s1.equalsIgnoreCase("qt"))
{
return "video/quicktime";
}
if (s1.equalsIgnoreCase("mov"))
{
return "video/quicktime";
}
if (s1.equalsIgnoreCase("avi"))
{
return "video/x-msvideo";
}
if (s1.equalsIgnoreCase("movie"))
{
return "video/x-sgi-movie";
}
if (s1.equalsIgnoreCase("ice"))
{
return "x-conference/x-cooltalk";
}
if (s1.equalsIgnoreCase("wrl"))
{
return "x-world/x-vrml";
}
if (s1.equalsIgnoreCase("vrml"))
{
return "x-world/x-vrml";
}
if (s1.equalsIgnoreCase("wml"))
{
return "text/vnd.wap.wml";
}
if (s1.equalsIgnoreCase("wmlc"))
{
return "application/vnd.wap.wmlc";
}
if (s1.equalsIgnoreCase("wmls"))
{
return "text/vnd.wap.wmlscript";
}
if (s1.equalsIgnoreCase("wmlsc"))
{
return "application/vnd.wap.wmlscriptc";
}
if (s1.equalsIgnoreCase("wbmp"))
{
return "image/vnd.wap.wbmp";
}
if (s1.equalsIgnoreCase("css"))
{
return "text/css";
}
if (s1.equalsIgnoreCase("jad"))
{
return "text/vnd.sun.j2me.app-descriptor";
}
if (s1.equalsIgnoreCase("jar"))
{
return "application/java-archive";
}
if (s1.equalsIgnoreCase("3gp"))
{
return "video/3gp";
}
if (s1.equalsIgnoreCase("3g2"))
{
return "video/3gpp2";
}
if (s1.equalsIgnoreCase("mp4"))
{
return "video/3gpp";
}
}
return "application/octet-stream";
}

Happy coding...! I hope this helps! :)