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1. doGet vs doPost
    Õâ¸öÎÊÌ⣬ÀÏʦ½²µÃ²»ÊǺÜÇåÎú£¬½ö½ö½²ÁËdoGetÊÇ¿ÉÒÔÈ¡³ö²ÎÊýÖµÔÚurlÖеIJÎÊý¡£ÒÔÏÂÄÚÈÝcopy×ÔÍøÂ磺
“getÖ»ÓÐÒ»¸öÁ÷£¬²ÎÊý¸½¼ÓÔÚurlºó£¬µØÖ·ÐÐÏÔʾҪ´«Ë͵ÄÐÅÏ¢£¬´óС¸öÊýÓÐÑϸñÏÞÖÆÇÒÖ»ÄÜÊÇ×Ö·û´®¡£
postµÄ²ÎÊýÊÇͨ¹ýÁíÍâµÄÁ÷´«µÝµÄ£¬ ²»Í¨¹ýurl£¬ËùÒÔ¿ÉÒԺܴó£¬Ò²¿ÉÒÔ´«µÝ¶þ½øÖÆÊý¾Ý£¬ÈçÎļþµÄÉÏ´«¡£
1¡¢°²È«
GETµ÷ÓÃÔÚURLÀïÏÔʾÕý´«Ë͸øSERVLETµÄÊý¾Ý£¬ÕâÔÚϵͳµÄ°²È«·½Ãæ¿ÉÄÜ´øÀ´ÎÊÌ⣬ÀýÈçÓû§ÃûºÍÃÜÂëµÈ
POST¾Í¿ÉÒÔÔÚÒ»¶¨³Ì¶ÈÉϽâ¾ö´ËÀàÎÊÌâ
2¡¢·þÎñÆ÷½ÓÊÕ·½Ê½
·þÎñÆ÷Ëæ»ú½ÓÊÜGET·½·¨µÄÊý¾Ý£¬Ò»µ©¶ÏµçµÈÔ­Òò£¬·þÎñÆ÷Ò²²»ÖªµÀÐÅÏ¢ÊÇ·ñ·¢ËÍÍê±Ï
¶øPOST·½·¨£¬·þÎñÆ÷ÏȽÓÊÜÊý¾ÝÐÅÏ¢µÄ³¤¶È£¬È»ºóÔÙ½ÓÊÜÊý¾Ý
3¡¢formÔËÐз½Ê½
µ±form¿òÀïÃæµÄmethodΪgetʱ£¬Ö´ÐÐdoGet·½·¨
µ±form¿òÀïÃæµÄmethodΪpostʱ£¬Ö´ÐÐdoPost·½·¨
4¡¢ÈÝÁ¿ÏÞÖÆ
GET·½·¨ºóÃæµÄÐÅÏ¢Á¿×Ö½Ú´óС²»Òª³¬¹ý1.3K£¬¶øPostÔòûÓÐÏÞÖÆ
¿ÉÒÔÓÃservice()À´ÊµÏÖ£¬Ëü°üº¬ÁËdoGetºÍdoPost(×¢Òâ´Ë´¦£¬²»ÊÇdoGetºÍdoPost±»service·½·¨µ÷ÓÃ
)£»·½·¨ÊǽӿÚÖеķ½·¨£¬servletÈÝÆ÷°ÑËùÓÐÇëÇó·¢Ë͵½¸Ã·½·¨£¬¸Ã·½·¨Ä¬ÈÏÐÐΪÊÇת·¢httpÇëÇóµ½doXXX·½·¨ÖУ¬Èç¹ûÄãÖØÔØÁ˸÷½·¨£¬Ä¬ÈϲÙ×÷±»¸²¸Ç£¬²»ÔÙ½øÐÐת·¢²Ù×÷£¡
service()ÊÇÔÚjavax.servlet.Servlet½Ó¿ÚÖж¨ÒåµÄ,   ÔÚjavax.servlet.GenericServletÖÐʵÏÖÁËÕâ¸ö½Ó¿Ú,   ¶ø   doGet/doPost   ÔòÊÇÔÚ   javax.servlet.http.HttpServlet  
ÖÐʵÏÖµÄ,   javax.servlet.http.HttpServlet   ÊÇ  
javax.servlet.GenericServlet   µÄ×ÓÀà.  
   
  ËùÓпÉÒÔÕâÑùÀí½â,  
ÆäʵËùÓеÄÇëÇó¾ùÊ×ÏÈÓÉ   service()   ½øÐд¦Àí,   ¶øÔÚ   javax.servlet.http.HttpServlet  
µÄ   service()   ·½·¨ÖÐ,   Ö÷Òª×öµÄÊÂÇé¾ÍÊÇÅжÏÇëÇóÀàÐÍÊÇ   Get   »¹ÊÇ   Post,   È»ºóµ÷ÓöÔÓ¦µÄ  
doGet/doPost   Ö´ÐÐ.”
2.Cookie vs Session
    What is cookie:
    1) It is essentially a piece of txt sent to the client from server
    2) The client can prevent the server from writing cookie
    3) A server can only get the cookie of itself
   


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 public boolean isEmpty();
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