Ò׽ؽØÍ¼Èí¼þ¡¢µ¥Îļþ¡¢Ãâ°²×°¡¢´¿ÂÌÉ«¡¢½ö160KB

Java Web¿ª·¢Ñ§Ï°±Ê¼ÇÖ®¶þ

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
   


Ïà¹ØÎĵµ£º

Java+MysqlµÄÊý¾Ý¿â²éÕÒʵÏÖ


public class select {
 public List XiuGai_select(String keyword){
  List list=new ArrayList();
        Connection conn = null;
  Statement stmt = null;
  String sql=null;
  ResultSet res = null;
  get ......

Ïê½âJava ÖеÄÀà¼ÓÔØ»úÖÆ

Ê×ÏÈÃ÷È·ÏÂÀà¼ÓÔØµÄ¶¨Ò壬Àà¼ÓÔØÊµ¼ÊÉϾÍÊǽ«java classÎļþ¼ÓÔØµ½java ÐéÄâ»úÖУ¬¸ù¾ÝJVM¹æ·¶µÄ¶¨Ò壬һ°ã·ÖΪ2ÖÖÀàÐ͵ÄÀà¼ÓÔØ£¬Ò»ÖÖÊÇÆô¶¯Àà¼ÓÔØÆ÷£¬ÁíÍâÒ»ÖÖÊÇÓû§×Ô¶¨ÒåÀà¼ÓÔØÆ÷¡£
Ò» Æô¶¯Àà¼ÓÔØÆ÷¡£
Æô¶¯Àà¼ÓÔØÆ÷Ò²ÓÐÒÔÏÂÈýÖÖ£ºBootstrap ClassLoader¡¢AppClassLoaderºÍExtClassLoader,ÕâÈýÖÖclassloaderÔÚjavaÐéÄâ» ......

javaÀàÐÍ×¢Èë

public class Bean1 {
private String strValue;

private int intValue;

private List listValue;

private Set setValue;

private String[] arrayValue;

private Map mapValue;

public String getStrValue() {
return strValue;
}
public void setStrValue(String strValue) {
t ......

JAVA Êý¾Ý½á¹¹ÓëË㷨ѧϰ±Ê¼ÇÒ»(×ªÔØ)

¶þ·Ö²éÕÒ·¨ºÍÏßÐÔ²éÕÒ·¨
¶þ·Ö²éÕÒ·¨ÊÇÒ»ÖÖ±ÈÆÕͨÏßÐÔ²éÕÒ¿ìµÃ¶àµÄ²éÕÒËã·¨£¬µ«Ö»ÊÊÓÃÓÚÓÐÐò¼¯ºÏµ±ÖС£ÄÃÉýÐòÅÅÐòºóµÄÕûÐÍÊý×éÀ´Ëµ£¬¶þ·Ö·¨¾ßÌåµÄʵÏÖÔ­ÀíÊÇ£ºÏȰѴý²éÕÒÊýaÓëÊý×éÖмäµÄÄǸöÊýx¶Ô±È£¬Èç¹ûÏàµÈ£¬Ö±½Ó·µ»ØxµÄË÷Òý£»Èç¹ûa´óÓÚx£¬ÔòÅųýµôÊý×éµÄÇ°ÃæÒ»°ë£¨°üÀ¨x£©£¬½Ó×ÅÄÃaÓëÊ£ÏÂÒ»°ëÊý×éÖмäµÄÄǸöÊýx¶Ô±È£¬Èç ......

Java²ÎÊý´«µÝ(¾­µä,·ÇÔ­´´)

1. ¼òµ¥ÀàÐÍÊǰ´Öµ´«µÝµÄ
¡¡¡¡Java ·½·¨µÄ²ÎÊýÊǼòµ¥ÀàÐ͵Äʱºò£¬Êǰ´Öµ´«µÝµÄ (pass by value)¡£ÕâÒ»µãÎÒÃÇ¿ÉÒÔͨ¹ýÒ»¸ö¼òµ¥µÄÀý×ÓÀ´ËµÃ÷£º
/* Àý 1 */
/**
* @(#) Test.java
* @author fancy
*/
public class Test {
   public static void test(boolean test) {
    &nb ......
© 2009 ej38.com All Rights Reserved. ¹ØÓÚE½¡ÍøÁªÏµÎÒÃÇ | Õ¾µãµØÍ¼ | ¸ÓICP±¸09004571ºÅ