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();
}
}