???????Java???????????(????)
???????????? ???????[ 2015/1/6 11:49:41 ] ????????Java????? ?????????????
????1.web ?е? forward ?? redirect ??????
???????????????п??????????????????????????в????????????????????????????????????????????????????????????·????????????????????????????????п????????????????????????????????Ч??????????????????????????? forward()???????????????????????????????????????Щ????£????磬????????????????????????????????????? sendRedirect()??????
????2. xml ????????? DOM ?? SAX Э??????????壿
????DOM:????????????????????????????????????????? DOM ???????????????????????????????DOM ????????????????????????????棬???? XML ?????????
????SAX:?????? DOM??SAX ???????????? XML ???????????????? XML ????????????????????????????????????????????????????????????????????????????????????????????????????????д????????????? XML ????????? XML ????????
????3 ??? JNDI??JMS??JTA??RMI ???????
????JNDI(Java Naming and Directory Interface)???????ó??????? API???????????????????????????????????????á???????????? JDBC ????????????????
????JMS??Java Messaging Service???? Java ?????й?????????м????????淶??????? Java ???????JMS ??????????/???????????????
????JTA(Java Transaction API) ? J2EE ??????????????????? JTA ????????綨????ó???????? javax.transaction.UserTransaction ????е??????
????RMI ?? Java ??????????????????ó???? API??RMI ??? Java ????????????????????????? Java ???л???Java ??????Э??(Java Remote Method Protocol)???????????? Java ??????????????????
????4.??????
????Public class Signle{
????Private Signle(){
????}
????Pirvate static Signle signle = new Signle();
????Public static Signle gets(){
????Retrun signle;
????}
????}
????5 ??????? left join ???????????????????????
????LEFT JOIN ???????????κε? FROM ????У????????????????? LEFT JOIN ??????????????????????????????????????????????????????????????е???????????????????????????в??????????????
????6 ejb ?е? sessionbean ?? entitybean ?????????壿
????SessionBean??J2EE??ó????б?????????Щ?????????????????????????????????????EJB?????EntityBean???????????????????????????
??????????????SessionBean ???????????????????Щ????????????е?????????
??????????????EntityBean ??????????????????????洢??????洢???е???????????????????????????????ó?????????塣
????7 ??????????????
????1:???????????????????????????????????????????????
????2??????????????????????????????????????з?????Ч????????????
????3??????????????????????????????????????С?
????4????????????е????????????η?????? public??internal??protected??protected internal??private?????????????????η?????????????? public?????????????????????????????÷??????η?????????????? public????
????5????????????????幹????????????????С?
??????
???·???
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