To Save a file in a different location

[Steph Sam]

Hi All,

In my project i have a requirement. The user will upload any kind of image. The image has to be stored in a different location. How can i do it? I'm able to browse and select the image using html. But how to read the file and store it in a different location?

[Rob Spoor]

Upload to what? A web server? Running JSP / servlets, or what?

[Anutosh Swamy]

Hope this code will help you to upload any file type to any location
you need to modify the the code according to your project.

public class FileUploadServlet extends HttpServlet {
    
    /** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
     * @param request servlet request
     * @param response servlet response
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        
        //response.setContentType("text/html");
        //PrintWriter out = response.getWriter();
        String uploadDir="";
        String nextpage="";
        int startPos = 0;
int endPos = 0;
        int count = 0;
int pos = 0;
        int byteRead = 0;
int totalBytesRead = 0;
        String fileData = "";
        String s="";
        String fileName = "",boundary="";
        String backup_dir = Constant.DB_BAK_DIR;
        String selectDb = request.getParameter("seldb");
        
        request.setAttribute("upload","true");
        
        String contentType = request.getContentType();
        int formDataLength = request.getContentLength();
        byte[] buf = new byte[formDataLength];
        byte[] line = new byte[128];
         
        
        
        ServletInputStream in = request.getInputStream();
        
        while (totalBytesRead < formDataLength)
{
byteRead = in.read(buf, totalBytesRead, formDataLength);
totalBytesRead += byteRead;
}
        
        do{
            copyByte(buf, line, count ,1);//read 1 byte at a time
            count+=1;
            s = new String(line, 0, 1);
            fileData = fileData + s;
            pos = fileData.indexOf("Content-Disposition: form-data; name=\""); //set the file name
            if(pos != -1)
                endPos = pos;
        }while(pos == -1);
        boundary = fileData.substring(startPos, endPos);
        
        startPos = endPos;
        do{
            copyByte(buf, line, count ,1);//read 1 byte at a time
            count+=1;
            s = new String(line, 0, 1);
            fileData = fileData + s;
            pos = fileData.indexOf("Content-Type: ",startPos); //set the file name
            if(pos != -1)
                endPos = pos;
        }while(pos == -1);
        selectDb = fileData.substring((fileData.indexOf("\"seldb\"")+11),(fileData.indexOf("\"seldb\"")+16));
        selectDb = selectDb.trim();
        //startPos = endPos;
do{
            copyByte(buf, line, count ,1);//read 1 byte at a time
            count+=1;
            s = new String(line, 0, 1);
            fileData = fileData + s;
            pos = fileData.indexOf("filename=\"", startPos); //set the file name
            if(pos != -1)
                startPos = pos;
}while(pos == -1);
        
do{
            copyByte(buf, line, count ,1);//read 1 byte at a time
            count+=1;
            s = new String(line, 0, 1);
            fileData = fileData + s;
            pos = fileData.indexOf("Content-Type: ", startPos);
            if(pos != -1)
                endPos = pos;
}while(pos == -1);
        fileName = fileData.substring(startPos + 10, endPos - 3);
        fileName = fileName.substring((fileName.lastIndexOf("\\")+1),fileName.length());
        
        boolean blnNewlnFlag = false;
startPos = endPos;//added length of "Content-Type: "
do{
            copyByte(buf, line, count ,1);//read 1 byte at a time
            count+=1;
            s = new String(line, 0, 1);
            fileData = fileData + s;
            pos = fileData.indexOf("\n", startPos);
            if(pos != -1){
                if(blnNewlnFlag == true)
                    endPos = pos;
                else{
                    blnNewlnFlag = true;
                    pos = -1;
                }
            }
}while(pos == -1);
contentType = fileData.substring(startPos + 14, endPos);

//loop for extracting actual file data (any type of file)
startPos = count + 1;
do{
            copyByte(buf, line, count ,1);//read 1 byte at a time
            count+=1;
            s = new String(line, 0, 1);
            fileData = fileData + s;
            pos = fileData.indexOf(boundary, startPos);//check for end of file data i.e boundry value
}while(pos == -1);
endPos = count - boundary.length();
       
        if(selectDb!=null && selectDb.equals("tmcs")){
                uploadDir = backup_dir+"/tmcs";   
                request.setAttribute("option","1");
                nextpage = "/backup/selectdb.jsp";
        }
        if(selectDb!=null && selectDb.equals("aemvs")){
                uploadDir = backup_dir+"/aemvs";   
                request.setAttribute("option","2");
                nextpage = "/backup/selectdb.jsp";
        }
        if(selectDb!=null && selectDb.equals("nms")){
               
                
                uploadDir = backup_dir+"/nms";   
                request.setAttribute("option","3");
                nextpage = "/backup/selectdb.jsp";
        }
        
        
        
        FileOutputStream fos=null;
        File f1=new File(uploadDir+"/"+fileName);
        fos=new FileOutputStream(f1);
        fos.write(buf, startPos, (endPos - startPos));
        fos.flush();
        fos.close();
        
        RequestDispatcher rd = request.getRequestDispatcher(nextpage);
        rd.forward(request, response);
    }
    public void copyByte(byte [] fromBytes, byte [] toBytes, int start, int len)
{
for(int i=start;i<(start+len);i++)
{
toBytes[i - start] = fromBytes[i];
}
}
    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        processRequest(request, response);
    }
    
    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }
    // </editor-fold>
}

K.Anutosh
---------------------------------------------------------------------------
SCJP 1.4
SCWCD 1.4
OCA (Paper I)

[edit]Add code tags. CR[/edit]
[ October 13, 2008: Message edited by: Campbell Ritchie ]

[Steph Sam]

hi thanks for your reply. I need to upload the image from the user's machine to the server

[Campbell Ritchie]

And please use the code button, Anutosh Swamy; I have added the tags so you can see how much better the posting looks.

CR

[Anutosh Swamy]

Hi Campbell Ritchie,

Thanks for correcting my mistake, this will be surly taken care of in future.
[ October 20, 2008: Message edited by: Anutosh Swamy ]