MIDlet与Servlet之间传递Cookie |
| 作者：java2s 来源：java2s 发布时间：2006-7-25 8:59:29 |
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db("connect " + e.toString()); } } } /*-------------------------------------------------- * Simple message to console for debug/errors * When used with Exceptions we should handle the * error in a more appropriate manner. *-------------------------------------------------*/ private void db(String str) { System.err.println("Msg: " + str); } } /*-------------------------------------------------- * CookieServlet.java * * Use a cookie to identify clients * * Example from the book: Core J2ME Technology * Copyright John W. Muchow http://www.CoreJ2ME.com * You may use/modify for any non-commercial purpose *-------------------------------------------------*/ //package corej2me; // Required for mycgiserver.com import java.util.*; import java.io.*; import javax.servlet.*; import javax.servlet.http.*; import java.sql.*; import java.text.*; public class CookieServlet extends HttpServlet { // Pool of client ID's private static int[] clientIDs = {123, 456, 789, 901, 225, 701}; protected void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException { // Get cookie from the header Cookie[] cookies = req.getCookies(); //------------------------------------------- // If cookie passed in... // 1) Lookup the client ID in the database // and save the last access date // 2) Update the last access date in database // 3) Return to the client date from step 1 //------------------------------------------- if (cookies != null) { // There will be only one cookie Cookie theCookie = cookies[0]; String id = theCookie.getValue(); // Lookup client ID and get last access date String strLastAccess = lookupLastAccessDate(Integer.parseInt(id)); // Update database with current date updateLastAccessDate(Integer.parseInt(id)); // Send back the last access date to the client res.setContentType("text/plain"); PrintWriter out = res.getWriter(); out.print(strLastAccess); out.close(); } else // No Cookie { //------------------------------------------- // Generate a client ID. To keep the database // from growing out of control, this will not // generate a new ID for each client. // Instead, grab a random ID from the array // clientID's[]. The end result is the same // as far as the client is concerned. //------------------------------------------- // Random value between 0 and the number of // entries in the client list array int random = (int) Math.round(clientIDs.length * Math.random()); // Get the client ID to send in the cookie int ID = clientIDs[random]; // Update database with current date updateLastAccessDate(ID); // Create new cookie and send ID in the header Cookie cookie = new Cookie("ID", Integer.toString(ID)); res.addCookie(cookie); } } /*-------------------------------------------------- * Update database with last access date for client ID *-------------------------------------------------*/ private void updateLastAccessDate(int ID) { Connection con = null; Statement st = null; StringBuffer msgb = new StringBuffer(""); try { // These will vary depending on your server/database Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); con = DriverManager.getConnection("jdbc:odbc:acctInfo"); Statement stmt = con.createStatement(); // Create a date format SimpleDateFormat format = new SimpleDateFormat ("MMM dd-hh:mm aa"); String strDate = format.format(new java.util.Date()); ResultSet rs = stmt.executeQuery("UPDATE clientInfo set lastAccess = '" + strDate + "' where clientID = " + ID); } catch (Exception e) { } } /*-------------------------------------------------- * Lookup the client ID in database and get the * last access date *-------------------------------------------------*/ private String lookupLastAccessDate(int id) { Connection con = null; Statement st = null; StringBuffer msgb = new StringBuffer(""); try { // These will vary depending on your server/database Class.forName("sun.jdbc.odbc.JdbcOdbcDriver"); con = DriverManager.getConnection("jdbc:odbc:acctInfo"); Statement stmt = con.createStatement(); ResultSet rs = stmt.executeQuery("Select lastAccess from clientInfo where clientID = " + id); if (rs.next()) return rs.getString(1); else return null; } catch (Exception e) { return e.toString(); } } /*-------------------------------------------------- * Information about servlet *-------------------------------------------------*/ public String getServletInfo() { return "CookieServlet 1.0 - John W. Muchow - www.corej2me.com"; } } |
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