I have to display dialog box from servlet but without opening new window.
Below is code
PrintWriter printWriter =response.getWriter();
String s ="<HTML><HEAD><TITLE>JavaScript Example</TITLE>"+
"<SCRIPT LANGUAGE=JavaScript>"+
"alert('File Uploaded');"+
"</SCRIPT>"+
"</HEAD>"+
"</HTML>";
printWriter.print(s);
This code open dialog in new window but I want dialog in current window.
It's hard to understand your problem. The posted code isn't opening a new window at all, it's just displaying an alert dialog. If you mean to say that it is opening a new window and then displaying the alert, then the problem rather lies in the calling code. Maybe you have a target="_blank" in the link or the form which is calling the servlet?
That said, generating view code in a servlet isn't always the best practice. JSP should be used for that.