import java.io.IOException;import java.io.PrintWriter;import java.text.SimpleDateFormat;import java.util.Date;import javax.servlet.ServletException;import javax.servlet.http.Cookie;import javax.servlet.http.HttpServlet;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;public class CreateCookie extends HttpServlet {	public void doGet(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		this.doPost(request, response);	}	public void doPost(HttpServletRequest request, HttpServletResponse response)			throws ServletException, IOException {		response.setContentType("text/html;charset=gb2312");		PrintWriter out = response.getWriter();		// 创建cookie		// 时间-1为回话级别的 关闭会话就删除		Cookie ck = new Cookie("mycookie", "123");		ck.setMaxAge(-1);		response.addCookie(ck);		// out.println("创建mycookie");		// 创建同名cookie覆盖		Cookie ck1 = new Cookie("mycookie", java.net.URLEncoder.encode("哈哈哈",				"gb2312"));		ck1.setMaxAge(3600);		response.addCookie(ck1);		// out.println("创建mycookie");		// 创建同名cookie覆盖		// out.println("创建ck_date");		// 这里取到的是上一次的 因为没有回发		Cookie[] cks = request.getCookies();		boolean isFirst = true;		if (cks != null) {			out.println(cks.length);			for (Cookie c : cks) {				out.println(c.getName() + ","						+ java.net.URLDecoder.decode(c.getValue(), "gb2312")						+ "
");				// c.setMaxAge(0);				// response.addCookie(c);				// out.println("删除"+c.getName());				if (c.getName().equals("ck_date")) {					isFirst = false;					out.println("上次登录：" + c.getValue());					break;				}			}		}		if (isFirst) {			out.println("首次登录");			addDateCookie(response, out);		}		addDateCookie(response, out);	}	private void addDateCookie(HttpServletResponse response, PrintWriter out) {		SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");		String nowTime = sdf.format(new Date());		Cookie ck_date = new Cookie("ck_date", nowTime);		ck_date.setMaxAge(3600);		response.addCookie(ck_date);	}}