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UpForm upForm = (UpForm) form;
try {
    InputStream in = ff.getInputStream();
    String dir = this.getServlet().getServletContext().getRealPath("/WEB-INF/ss/s");
    File f = new File(dir);//+"\\"+ff.getFileName());
    if(!f.exists()){
f.mkdirs();
    }
    f = new File(dir,ff.getFileName());
    FileOutputStream fos = new FileOutputStream(f);
    byte [] buf = new byte[1024];
    int i = 0;
    while((i=in.read(buf)) != -1){
fos.write(buf, 0, i);
    }
in.close();
fos.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

try {
response.sendRedirect("a.jsp");
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}


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