1.利用session對象
session對象表示特定會話session的用戶數(shù)據(jù)?？蛻舻谝淮卧L問支持session的JSP網(wǎng)頁，服務(wù)器會創(chuàng)建一個session對象記錄客戶的信息。當(dāng)客戶訪問同一網(wǎng)站的不同網(wǎng)頁時，仍處于同一個session中。
（1）后臺代碼
request.getSession().setAttribute("name", name);?
request.getSession().setMaxInactiveInterval(2);?
response.sendRedirect("welcome.jsp");?
（2）前臺代碼（jsp頁面）
1Object user=request.getSession().getAttribute("name");
2.利用request重定向，設(shè)置setAttribute
（1）后臺代碼
request.setAttribute("name",?"cute");?
request.getRequestDispatcher("welcome.jsp").forward(request, response);?//網(wǎng)址不會改變
PS:如果后臺使用的轉(zhuǎn)發(fā)代碼為?response.sendRedirect("welcome.jsp"); ?//網(wǎng)址變?yōu)閣elcome.jsp
則request設(shè)置的參數(shù)無效，因?yàn)橐呀?jīng)切換到另一個請求了，request參數(shù)的有效期為本次請求。
（2）前臺代碼
1String name=request.getAttribute("name").toString();?
3.利用Ajax進(jìn)行異步數(shù)據(jù)請求（得到的數(shù)據(jù)可以以json或xml格式返回，便于處理）
public?class?TestServlet?extends?HttpServlet {?
????/**
?????* Constructor of the object.
?????*/
????public?TestServlet() {?
????????super();?
????}?
????public?void?doGet(HttpServletRequest request, HttpServletResponse response)?
????????????throws?ServletException, IOException {?
????????doPost(request, response);?
????}?
????public?void?doPost(HttpServletRequest request, HttpServletResponse response)?
????????????throws?ServletException, IOException {?
????????response.setContentType("text/html");?
????????PrintWriter out = response.getWriter();?
????????String data="[{\"name\":\"apple\",\"price\":23},{\"name\":\"banana\",\"price\":12},{\"name\":\"orange\",\"price\":8}]";?
????????out.write(data);?
????????out.flush();?
????????out.close();?
????}?
