# Cookie的知識 ###### tags: `Java Web-常用知識點` ### Cookie是什麼 Cookie:在客戶端保存的數據,在與服務器連接時,發送給服務器 ### Cookie的生成步驟 #### 1.創建Cookie對象 #### 2.在客戶端保存Cookie #### 3.設置Cookie的有效時長(秒為單位) cookie.setMaxAge(); cookie.setDomain(pattern); cookie.setPath(uri); #### 4.cookie的應用 4-1:記住用戶名和密碼10天 setMaxAge(60*60*24*10) 4-2:10天免登陸  ```java= @WebServlet("/cookie01") public class CookieServlet01 extends HttpServlet { @Override protected void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { //1.创建一个Cookie对象 Cookie cookie = new Cookie("uname","jim"); //2.将这个Cookie对象保存到浏览器端 response.addCookie(cookie); request.getRequestDispatcher("hello01.html").forward(request,response); } } ```
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