How to open PDF file in new tab using Servlet & Javascript ?

//This functions call when user click on print declaration form button 
public void openPDF(HttpServletRequest req,HttpServletResponse res){
 try {
      ServletContext context = req.getServletContext();
      String contextpath = context.getRealPath("/")+GlobalVariables.OUTPUT_FOLDER;
      HttpSession session = req.getSession();   
      String user_order_id ="";
      if(session.getAttribute("user_order_id") != null){
         user_order_id = session.getAttribute("user_order_id").toString(); //when user_order_id already exists in session .
      String fileName = user_order_id+"-PrintLabels.pdf";
      res.setHeader("Expires", "0");
      res.setHeader("Cache-Control","must-revalidate, post-check=0, pre-check=0");
      res.setHeader("Content-Disposition","inline;filename=" + fileName);
      res.setHeader("Accept-Ranges", "bytes");
      File nfsPDF = new File(contextpath+ fileName);
      FileInputStream fis = new FileInputStream(nfsPDF);
      BufferedInputStream bis = new BufferedInputStream(fis);
      ServletOutputStream sos = res.getOutputStream();
      byte[] buffer = new byte[2048];
      while (true) {
        int bytesRead =, 0, buffer.length);
        if (bytesRead < 0) {
      sos.write(buffer, 0, bytesRead);
    } catch (Exception e) {

Call appropriate servlet url to call this method. Note : Return type must be void. Example : if we have servlet URL like "printLable.html" then open this url dynamically using my earlier post for Open number of new tabs in Browser Using Javascript

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Daksh Bhatt said...

thanks man, I'm wondering for this in my project and you help me . . .

Vipul Chauhan said...

Welcome Mr.Daksh Bhatt.

Tebogo Kgofelo said...

What is the actual line that makes the file to be opened in a new tab. thanks

Vipul Chauhan said...

Hi Tebogo Kgofelo,

Kindly visit below URL which creates form dynamically in javascript & submit on the fly. So by using those functions you have to create form dynamically & submit & just pass the proper url in the function
which automatically open PDF in different tab of your browser.

form's taget attribut is "_blank" so this statement is going to open PDF in different tab.

If you need more help then please let me know

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