java 中的session和Cookie 处理

import java.io.File;
import java.io.IOException;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import javax.naming.NamingException;
import javax.servlet.ServletContext;

import java.io.PrintWriter;
import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.sql.SQLException;
import java.awt.datatransfer.*;
import java.util.Date;
import java.util.logging.Logger;

// @WebServlet("/Login")
public class Login extends HttpServlet {
private static final long serialVersionUID = 1L;

/**
 * @see HttpServlet#HttpServlet()
 */
public Login() {
    super();
    // TODO Auto-generated constructor stub
}

/**
 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
 *      response)
 */
protected void doGet(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    // 会话处理
    HttpSession session = request.getSession(false);
    if (session == null) {
        System.out.println("没有会话");
        session = request.getSession(true);
        Date date = new Date();
        long lastdatetime = date.getTime();
        String dateString = String.valueOf(lastdatetime);
        session.setAttribute("lastdatetime", dateString);
    } else {
        System.out.println("有会话");
        String lastDateTimeString = (String) session.getAttribute("lastdatetime");
        System.out.println("上次的时间是：" + lastDateTimeString);
    }
    session.setMaxInactiveInterval(10);

    // Cookie
    Cookie[] sss = request.getCookies();
    if (sss.length > 1) {
        System.out.println("have");
        this.printCookieList(sss, response);
    } else {
        System.out.println("no have");
        Cookie myCookie = new Cookie(URLEncoder.encode("username", "utf-8"), URLEncoder.encode("牛宏飞", "utf-8"));
        myCookie.setMaxAge(10);
        response.addCookie(myCookie);
        this.printCookieList(request.getCookies(), response);
    }

    // 设置响应内容类型
    response.setContentType("text/html;charset=UTF-8");
    PrintWriter out = response.getWriter();
    // 处理中文
    String name = new String(request.getParameter("username").getBytes("ISO8859-1"), "UTF-8");
    String pwd = new String(request.getParameter("pwd").getBytes("ISO8859-1"), "UTF-8");
    out.println("用户名：" + name + "密码：" + pwd);

    ConnectSql connectSql = new ConnectSql();
    try {
        connectSql.connectMysql();
    } catch (ClassNotFoundException | SQLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    ServletContext servletContext = getServletContext();
    out.println("realpath = <br/>" + servletContext.getRealPath("./") + File.pathSeparator + "nhfc99");
    Logger logger = Logger.getLogger("username");
}

/**
 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse
 *      response)
 */
protected void doPost(HttpServletRequest request, HttpServletResponse response)
        throws ServletException, IOException {
    // TODO Auto-generated method stub
    doGet(request, response);
}

private void printCookieList(Cookie[] object, HttpServletResponse response) throws UnsupportedEncodingException {
    for (int i = 0; i < object.length; i++) {
        Cookie oneCookie = object[i];
        System.out.println("cookie name = " + URLDecoder.decode(oneCookie.getName(), "utf-8"));
        System.out.println("cookie value = " + URLDecoder.decode(oneCookie.getValue(), "utf-8"));
    }
}

}