會話技術_概述以及Cookie快速入門
阿新 • • 發佈:2022-12-10
會話技術_概述
會話:一次會話中包含多次請求和響應
一次會話:瀏覽器第一次給伺服器資源傳送請求,會話建立,直到有一方斷開為止
功能:在一次會話的範圍內的多次請求間,共享資料
方式:
1.客戶端會話技術:Cookie
2.服務端會話技術:Seesion
會話技術_Cookie快速入門
概念:客戶端會話技術,將資料儲存到客戶端
快速入門:
使用步驟:
1.建立Cookie物件,繫結資料
new Cookie(String name,String value);
2.傳送Cookie物件
response.addCookie(Cookie cookie);
3.獲取Cookie,拿到資料
Cookie[] request.getCookies();
建立和傳送Cookie:
@WebServlet(name = "CookieDemo1", value = "/CookieDemo1") public class CookieDemo1 extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.建立Cookie物件 Cookie c = new Cookie("msg", "hello"); //2.傳送Cookie response.addCookie(c); } }
獲取遍歷Cookie:
@WebServlet(name = "CookieDemo2", value = "/CookieDemo2") public class CookieDemo2 extends HttpServlet { @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { this.doPost(request, response); } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //3.獲取Cookie Cookie[] cookies = request.getCookies(); //獲取資料,遍歷Cookie if (cookies != null){ for (Cookie cookie : cookies) { String name = cookie.getName(); String value = cookie.getValue(); System.out.println(name+":"+value); } } } }