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Get output stream from HttpServletResponse

import java.io.ByteArrayOutputStream; import java.io.DataInputStream; import java.io.DataOutputStream; import java.io.IOException; import javax.servlet.ServletException; import javax.servlet.ServletOutputStream; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import javax.servlet.http.HttpSession; public class CounterServer extends HttpServlet {   static final String COUNTER_KEY = "Counter.txt";   public void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException,       IOException {     HttpSession session = req.getSession(true);     int count = 1;     Integer i = (Integer) session.getAttribute(COUNTER_KEY);     if (i != null) {       count = i.intValue() + 5;     }     session.setAttribute(COUNTER_KEY, new Integer(count));     DataInputStream in = new DataInputStream(req.getInputStream());     resp.setContentType("application/octet-stream");     ByteArrayOutputStream byteOut = new ByteArrayOutputStream();     DataOutputStream out = new DataOutputStream(byteOut);     out.writeInt(count);     out.flush();     byte[] buf = byteOut.toByteArray();     resp.setContentLength(buf.length);     ServletOutputStream servletOut = resp.getOutputStream();     servletOut.write(buf);     servletOut.close();   } }