jsp¼¸ÖÖ·½·¨

1.±ØÐë¼Ì³Ð×ÔHttpServlet
  2.±ØÐëʵÏÖdoGet()»òÕßdoPost()
  3.±ØÐëÔÚweb.xmlÖÐÅäÖÃServlet
  <servlet>
  <servlet-name> </servlet-name>
  <servlet-class> </servlet-class>
  </servlet>
  <servlet-mapping>
  <servlet-name> </servlet-name>
  <url-pattern> </url-pattern>
  </servelt-mapping>
  
  HttpServeltRrequest:ÇëÇó¶ÔÏó
  getParameter():»ñµÃ±íµ¥ÔªËصÄÖµ
  getAttribute():»ñµÃrequest·¶Î§ÖеÄÊôÐÔÖµ
  setAttribute():ÉèÖÃreqeust·¶Î§ÖеÄÊôÐÔÖµ
  setCharacterEncoding():ÉèÖÃ×Ö·û±àÂë
  
  HttpSerletResponse:ÏàÓ¦¶ÔÏó
  sendRedirect():ÍⲿÌøת
  getWriter():»ñµÃÊä³öÁ÷¶ÔÏó
  setContentType("text/html; charset=utf-8"):ÉèÖÃÏàÓ¦ÄÚÈݸñʽºÍ±àÂë
  
  ËÄÖֻỰ¸ú×Ù·½Ê½:
  1.Session
  HttpSession session = request.getSession();
  session.setAttribute("name", "zhangsan");
  session.setAttribute("pwd", "aaa");
  String name = (String) session.getAttribute("name");
  
  2.cookie:
  //´´½¨Cookie
  Cookie cookie = new Cookie("name", "zhangsan");
  //ÉèÖÃCookieµÄ³¬Ê±Ê±¼ä
  cookie.setMaxAge(24 * 60 * 60 *60);
  //°ÑCookie·¢Ë͵½¿Í»§¶Ë
  response.addCookie(cookie);
  
  //µÃµ½¿Í»§¶Ë·¢Ë͵ÄCookie
  Cookie [] cookies = request.getCookies();
  for(int i=0; i <cookies.length; i++) {
   Cookie temp = cookies[i];
   String key = temp.getName();
   String value = temp.getValue();
  }
  
  3.Òþ²Ø±íµ¥Óò
  <input type="hidden" name="name" value="zhangsan" />
  request.getParameter("name");
  
  4.UrlÖØд
  ÎʺŴ«²Î
  LoginServlet?username=zhangsan&pwd=123
  String name = request.getParameter("username");