1.Session的概念

• Session是依賴于Cookie的，
• 每次請求時，會將特殊標(biāo)識帶到服務(wù)器端，根據(jù)這個標(biāo)識來找到對應(yīng)的內(nèi)存空間，從而實(shí)現(xiàn)數(shù)據(jù)共享!是Servlet規(guī)范中四大域?qū)ο笾坏臅捰驅(qū)ο蟆?/li>
• 作用:是Servlet規(guī)范中四大域?qū)ο笾坏臅捰驅(qū)ο蟆？梢詫?shí)現(xiàn)數(shù)據(jù)共享
  

2.Session設(shè)置共享數(shù)據(jù)

//Session的基本使用 @WebServlet("/ServletDemo1") public class ServletDemo1 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//設(shè)置請求字符編碼,防止亂碼req.setCharacterEncoding("utf-8");//設(shè)置瀏覽器響應(yīng)編碼[html類型的文本,字符集為utf-8]resp.setContentType("text/html;charset=utf-8");//1.獲取請求的用戶名String username = req.getParameter("username");//2.獲取HttpSession的對象HttpSession session = req.getSession(true);//默認(rèn)為true,表示沒有session則自動創(chuàng)建//[驗(yàn)證是否為同一Session]System.out.println(session);System.out.println(session.getId());//3.將用戶名信息添加到共享數(shù)據(jù)中session.setAttribute("username",username);//2.解決Cookie禁用方法2：重寫url"<a href='"+resp.encodeURL("http://localhost:8080/Session/ServletDemo3")+"'>go servletDemo1</a>"// resp.getWriter().write("<a href='"+resp.encodeURL("http://localhost:8080/Session/ServletDemo3")+"'>go servletDemoO</a>");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);} }

3.Session獲取共享數(shù)據(jù)

//Session獲取共享數(shù)據(jù)[同一個session] @WebServlet("/ServletDemo2") public class ServletDemo2 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//設(shè)置瀏覽器響應(yīng)編碼[html類型的文本,字符集為utf-8]resp.setContentType("text/html;charset=utf-8");//1.獲取HttpSession對象HttpSession session = req.getSession();//[驗(yàn)證是否為同一Session]System.out.println(session);System.out.println(session.getId());//2.獲取共享數(shù)據(jù)String username = (String) session.getAttribute("username");//3.將響應(yīng)數(shù)據(jù)給瀏覽器resp.getWriter().write(username);}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);} }

4.Cookie的禁用解決方法

//Cookie的禁用 @WebServlet("/ServletDemo3") public class ServletDemo3 extends HttpServlet {@Overrideprotected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {//1.解決方法1：提示HttpSession session = req.getSession(false);System.out.println(session);if (session==null){resp.setContentType("text/html;charset=utf-8");resp.getWriter().write("為了不影響使用，請不要禁用瀏覽器的Cookie");}//2.解決方法2：重寫url"<a 【需到第一個界面重寫】href='"+resp.encodeURL("http://localhost:8080/Session/ServletDemo3")+"'>go servletDemo1</a>"// resp.getWriter().write("<a href='"+resp.encodeURL("http://localhost:8080/Session/ServletDemo3")+"'>go servletDemoO</a>");}@Overrideprotected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {doGet(req, resp);} }

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