// 當(dāng)點(diǎn)擊 的時(shí)候跳轉(zhuǎn)到 session2
    response.setContentType("text/html;charset=utf-8");
    //此方法會(huì)在路徑后面自動(dòng)拼接sessionId
    String path = response.encodeURL("/day11/session2");
    System.out.println(path);
    //頁(yè)面輸出
    response.getWriter().println("ip地址保存成功，想看 請(qǐng)<a href='" + path + "'>點(diǎn)擊</a>");

 // 重定向到session2
    String path = response.encodeRedirectURL("/day11/session2");
    System.out.println("重定向編碼后的路徑：" + path);
    response.sendRedirect(path);
session2代碼，獲得session1傳過來的ID
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 需求：從session容器中取出ip
    // 獲得session對(duì)象
    HttpSession session = request.getSession();
    // 獲取ip地址
    String ip = (String) session.getAttribute("ip");
    // 將ip打印到瀏覽器中
    response.setContentType("text/html;charset=utf-8");
    response.getWriter().println("IP:" + ip);
  }
session1代碼
  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    // 需求：將ip保存到session中
    // 獲取session
    HttpSession session = request.getSession();
    // 獲得ip
    String ip = request.getRemoteAddr();
    // 將ip保存到session中
    session.setAttribute("ip", ip);
    // 需求2：手動(dòng)的將 session對(duì)應(yīng)的cookie持久化，關(guān)閉瀏覽器再次訪問session中的數(shù)據(jù)依然存在
    // 創(chuàng)建cookie
    Cookie cookie = new Cookie("JSESSIONID", session.getId());
    // 設(shè)置cookie的最大生存時(shí)間
    cookie.setMaxAge(60 * 30);
    // 設(shè)置有效路徑
    cookie.setPath("/");
    // 發(fā)送cookie
    response.addCookie(cookie);
    // 當(dāng)點(diǎn)擊 的時(shí)候跳轉(zhuǎn)到 session2
    // response.setContentType("text/html;charset=utf-8");
    // String path = response.encodeURL("/day11/session2");
    // System.out.println(path);
    // response.getWriter().println("ip地址保存成功，想看 請(qǐng)<a href='" + path + "'>點(diǎn)擊</a>");
    // 重定向到session2
    String path = response.encodeRedirectURL("/day11/session2");
    System.out.println("重定向編碼后的路徑：" + path);
    response.sendRedirect(path);
  }