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//ѧϰ±Ê¼Ç, ¿ÉÄÜÓÐЩµØ·½Àí½âÓÐÎó, »á±í´ï²»Çå³þ
        v512_servlet+jsp
01 ÔÚÐÞ¸ÄÍêCookieºó,Ò»¶¨Òª¼ÓÉÏresponse.addCookie(c);
   CookieÖÐÖ»Äܱ£´æ×Öĸ»òÊý×ÖÐÅÏ¢;
02 req.getSession()Óëreq.getSession(boolean create)
   ÎÞ²ÎÊýµÄ == ÓвÎÊýµÄ²ÎÊýΪtrueʱ
   ÓвÎÊýµÄ,µ±²ÎÊýΪtrueʱ,Èç¹ûûÓÐSession¶ÔÏó¾Í´´½¨Ò»¸ö; Èç¹û²ÎÊýΪfalse,Ôò·µ»Ønull;
03 »á»°µÄÏûʧ: ä¯ÀÀÆ÷µÄ¹Ø±Õ; Ö÷¶¯¹Ø±Õ; »á»°³¬Ê±; (????ä¯ÀÀÆ÷¹Ø±Õ)
04 ÈçºÎÓ¦ÓÃEclipseÀ´¿ª·¢Servlet????????
 
05 TomcatµÄworkĿ¼±£´æÁËËùÓеÄjspת»»³ÉServletµÄËùÓÐÔ´ÎļþºÍ±àÒëºóµÄÎļþ;
06 charset = gbkÓëpageEncoding = gbkЧ¹ûÒ»Ñù;
07 <%@ include file="..." %>: ¿ÉÒÔ°üº¬Ò»¸ö.html/.jspµÈÎļþ½øÀ´;
08 Ö¸Áʽ°üº¬: <%@ include file="logn.jsp" %>  °ÑËüµÄÄÚÈݰüº¬½øÀ´;
   ¶¯×÷·½Ê½°üº¬: <jsp:include page="logn.jsp" >  µ÷Ó÷½·¨ÊµÏÖ;
                 <jsp:forward page="logn.jsp" > µÈ¼ÛÓÚ requuest.getRequestDipacher().forward(request,response)
09 ¶ÔÏóÃû:application ---> javax.servlet.ServletContext(ÉÏÏÂÎÄ)
10 ±»ÒýÈëµÄ.classÎļþ²»ÄÜûÓаü??? Èç:count2.jsp
11 ´íÎó´úÂë:
   401ÑéÖ¤³ö´í(ÈçÃÜÂë), 404²»´æÔÚµÄ×ÊÔ´, 405Ìá½»·½Ê½²»ÔÊÐí, 505·þÎñÆ÷¶Ë´úÂë´íÎó;
12 javabenaÐèÒª¶¨ÒåÒ»¸öÎ޲εķ½·¨, ÇÒ±ØÐëÒªÓаü, ²»ÄÜʹÓÃÂãÌåÀà;
13 <jsp:useBena setProperty name="..." property="..." /> ĬÈϽÓÊÜformÌá½»¹ýÀ´µÄ²ÎÊý;
     JSP EL
01. JSP ELÔËËã·û:
   ¿ÉÒÔÓÃdivÌæ»»/, ÓÃmodÌæ»»%
   and &&,  or ||,  not !
02. <%@ page isELIgnored="true" %> :Ö¸¶¨µ±Ç°Ò³Ã治ʹÓÃjsp el(Ò²¿ÉÒÔÔÚweb.xmlÖÐÅäÖÃ)
03. ${10 + 10 }Ï൱ÓÚ <%= 10+10 %>,  ¿ÉʹÓÃ\$»ò'$'Êä³ö: ×Ö·û$
04. ${username} :Êä³ö×÷ÓÃÓò×îСµÄusernameµÄÊôÐÔÖµ;
      Tag Lib
01. (1) ±àдһ¸öclass¼Ì³ÐTagSupport, ÖØÐ´doStartTag(),doEndTag()·½·¨,
   JspWriter out = pageContext.getOut();µÃµ½´


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jsp Í·Îļþ cookie

<%
Cookie[] cooks = request.getCookies();
String cookieName = "Mycookie";
boolean flag = false;
for(Cookie cook : cooks)
{
if(cook.getName().equals(cookieName))
{
    flag = true;
    break;
}
}
if(!flag){
String str=System.currentTimeMillis()+"";
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