package ajaxbook.chap4;import java.io.*;import java.net.*;import java.util.Random;import javax.servlet.*;import javax.servlet.http.*;public class EmployeeListServlet extends HttpServlet {        protected void addEmployee(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException {                //Store the object in the database        String uniqueID = storeEmployee();                //Create the response XML        StringBuffer xml = new StringBuffer("<result><uniqueID>");        xml.append(uniqueID);        xml.append("</uniqueID>");        xml.append("<status>1</status>");        xml.append("</result>");                //Send the response back to the browser        sendResponse(response, xml.toString());    }        protected void deleteEmployee(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException {                String id = request.getParameter("id");        /* Assume that a call is made to delete the employee from the database */                //Create the response XML        StringBuffer xml = new StringBuffer("<result>");        xml.append("<status>1</status>");        xml.append("</result>");                //Send the response back to the browser        sendResponse(response, xml.toString());    }        protected void doGet(HttpServletRequest request, HttpServletResponse response)    throws ServletException, IOException {        String action = request.getParameter("action");        if(action.equals("add")) {            addEmployee(request, response);        }        else if(action.equals("delete")) {            deleteEmployee(request, response);        }    }        private String storeEmployee() {        /* Assume that the employee is saved to a database and the         * database creates a unique ID. Return the unique ID to the          * calling method. In this case, make up a unique ID.         */        String uniqueID = "";        Random randomizer = new Random(System.currentTimeMillis());        for(int i = 0; i < 8; i++) {            uniqueID += randomizer.nextInt(9);        }                return uniqueID;    }        private void sendResponse(HttpServletResponse response, String responseText)     throws IOException {        response.setContentType("text/xml");        response.getWriter().write(responseText);    }}