ÔÚ Java »·¾³ÖÐʹÓà XQuery
XML Êý¾Ý¸ñʽºÜÄÑËÑË÷£¬µ«ÊÇ×î½üËæ×Å XQuery API µÄ³öÏÖ£¬XML ËÑË÷±äµÃ·Ç³£Áé»îºÍ¼òµ¥¡£¶ÔÓÚʹÓà SAX¡¢DOM¡¢JDOM¡¢JAXP µÈ´¦Àí XML ÎĵµµÄ Java™ ³ÌÐòÔ±À´Ëµ£¬¹¤¾ßÏäÖÐÔö¼Ó XQuery API for Java ÊÇÒ»¼þÖµµÃ¸ßÐ˵ÄÊ¡£ÏÖÔÚ Java ³ÌÐòÔ±²»ÓÃÔÙÇóÖúÓÚϵͳµ÷ÓûòÕß±¿×¾µÄ API ¾ÍÄÜÀûÓà XQuery µÄÇ¿´ó¹¦ÄÜÁË£¬Sun ÌṩÁËÒ»Ì×ÍêÕûµÄ¡¢±ê×¼»¯µÄ°ü¡£
SQL Êý¾Ý¿â¡¢XML Êý¾ÝºÍ²éѯ
ËäÈ»±à³ÌÁìÓò — ÌرðÊÇ Java ±à³Ì — ²»¶Ï·¢Õ¹£¬¿É¹©Ñ¡ÔñµÄ±ê×¼µÄÊýÁ¿Ò²ÔÚÔö³¤¡£»»¾ä»°Ëµ£¬Ô½À´Ô½¶àµÄ API µÃµ½ Sun µÄÈÏ¿É»òÕßÅú×¼¡£±ê×¼»¯µÄ½á¹ûÊÇÔ½À´Ô½¶àµÄ¿ª·¢Õß±³ÆúÁË×Ô¼º×î¾ß¾ºÕùÁ¦µÄ¼¼Êõ£¬¶øȥѧϰм¼Êõ¡£
ÒªÕÆÎÕµÄ×îÓÐÎüÒýÁ¦ºÍ¼ÛÖµµÄÊÇÄÇЩºÍÊý¾Ý´¦ÀíÓйصŤ¾ßºÍ API¡£ÎÞÂÛÓ¦ÓóÌÐò¶àô¿á»òÕßÖÇÄÜ£¬Ëµµ½µ×Ö»ÓÐÄܹ»´¦ÀíÊý¾Ý²ÅÓÐÓá£Í¬Ê±£¬ËäÈ» API ÊýÁ¿µÄ²»¶ÏÔö³¤£¬µ«Á÷ÐкÍͨÓõÄÊý¾Ý¸ñʽÊýÁ¿È´²»¶Ï¼õÉÙ¡£ËäÈ»ÓÐЩÊý¾Ý¹ÜÀíÔ±ÈÔȻʹÓÃÃæÏò¶ÔÏóµÄÊý¾Ý¿â¹ÜÀíϵͳ»òÕß XML Çý¶¯µÄÊý¾Ý¿â£¬µ«¹ØϵÊý¾Ý¿â£¨RDBMS£©ÒѳÉΪÖ÷Á÷£¬¶øÇÒÈÔÈ»ÊǴ󲿷ÖÊý¾Ý¹ÜÀíÔ±µÄÑ¡Ôñ¡£Òò´Ë Java ¿ª·¢ÈËÔ±±ØÐëͨ¹ý JDBC£¨Êý¾Ý¿âÁ¬½Ó£©»òÕß JDO (Java Data Objects) Óë SQL Êý¾Ý¿â½»»¥¡£
SQL Êý¾Ý¿âÓëÆäËûÊý¾Ý¿â
ËäÈ»±¾ÎÄÌáµ½Á˲éѯºÍÊý¾Ý¿â£¬µ«ËùÖ¸µÄÊÇ SQL Êý¾Ý¿â — Ò²³ÆΪ¹ØϵÊý¾Ý¿â¡£²»¹ý XML Êý¾Ý¿âÉõÖÁ¶ÔÏóÊý¾Ý¿â¶¼ÓÐһЩºÜºÃµÄÓ¦ÓóÌÐò¡£
Èç¹û¶Ô XML Êý¾Ý¿â¸ÐÐËȤ£¬¿ÉÒԲ鿴 DB2® Express-C£¬¿ÉÃâ·ÑÏÂÔØ£¨Á´½Ó²Î¼û ²Î¿¼×ÊÁÏ£©¡£×îÃ÷ÏÔµÄÒ»µãÊÇ£¬XML Êý¾Ý¿âÔÚ XML ÎĵµºÍ¹ØϵÊý¾ÝÖ®¼ä½øÐв»±ØÒªµÄת»»¡£±¾ÎÄ»¹ÈÏΪ£¬XQuery ʵ¼ÊÉÏÒѱäΪÊý¾Ý¿â²éѯÓïÑÔ£¬ÒòΪ XML Êý¾Ý¿âÒÔ XML ¸ñʽ´æ´¢Êý¾Ý¡£
Êý¾Ý¿âÖ®ÍâµÄÊý¾Ý»ù±¾ÉÏÒ²¶¼ÒÔ XML ×÷Ϊ±ê×¼Êý¾Ý¸ñʽ¡£XML ËäÈ»Èß³¤µ«Êǽ¡×³£¬Java ÓïÑÔÖд¦Àí XML µÄ API ¿ÉÄܱÈÆäËûÓïÑÔ¶¼¶à¡£ÎÞÂÛÊǽâÎö¡¢Êý¾Ý°ó¶¨»¹ÊÇת»»£¬Èç¹ûÓ¦ÓóÌÐò²»ÄÜ´¦Àí XML£¬¾Í»á±»ÈÏΪÓоÖÏÞÐÔÉõÖÁÓеãÂäºó¡£
Á½Õß¿´ËÆÎ޹أ¬— Êý¾ÝÍùÍù±£´æÔÚ SQL Êý¾Ý¿âÖУ¬Êý¾Ý¿âÖ®ÍâµÄÊý¾ÝÔ½À´Ô½¶àµØ²ÉÓà XML ¸ñʽ —£¬µ«ÊÇÈ´Ôì³ÉÁËһЩ¶ÀÌصÄÎÊÌâ¡£SQL Êý¾Ý¿âÈÝÒײéѯ£¬¶ø XML ÎĵµÔò²»ÊÇÕâÑù¡£Ïû·ÑÕßÏ£ÍûÄܹ»·½±ãµØËÑË÷Êý¾Ý£¬Êý¾Ý¿âÖеÄÊý¾Ý²éѯ·½±ã£¬µ«ÊÇ XML ÎĵµÖеÄÊý¾Ý¾Í²»ÄÇôÈÝÒ×ÁË¡£ÏÔÈ»£¬½« XML ¸ñʽµÄÊý¾ÝÈûµ½Êý¾Ý¿âÖÐÒÔ·½±ãËÑË÷µÄ×ö·¨ÊÇÐв»Í¨µÄ¡£ÓÚÊǾͳöÏÖÁË XQuery — ÏàÓ¦µÄÒ²¾ÍÓÐÁË XQuery API for Java (XQJ)¡£
ȯ
Ïà¹ØÎĵµ£º
Ò»°ãÇé¿ö»ñµÃ±¾µØËùÓеÄipµØÖ·£º
try {
InetAddress address = InetAddress.getLocalHost();
System.out.println(address.getHostAddress());
String name = address.getHostName();
System.out.println(name);
InetAddress[] addresses = &nbs ......
תÔصØÖ·£ºhttp://www.javaeye.com/topic/40489
´ÓJDK 1.4¿ªÊ¼£¬JavaµÄ±ê×¼¿âÖоͰüº¬ÁËNIO£¬¼´ËùνµÄ“New IO”¡£ÆäÖÐ×îÖØÒªµÄ¹¦ÄܾÍÊÇÌṩÁË“·Ç×èÈû”µÄIO£¬µ±È»°üÀ¨ÁËSocket¡£NonBlockingµÄIO¾ÍÊǶÔselect(Unixƽ̨ÏÂ)ÒÔ¼° WaitForMultipleObjects(Windowsƽ̨)µÄ·â×°£¬ÌṩÁ˸ßÐÔÄÜ¡¢Ò×ÉìËõµÄ·þÎ ......
ÔÚjava.lang°üÖÐÓÐString.split()·½·¨£¬·µ»ØÊÇÒ»¸öÊý×é
1¡¢Èç¹ûÓÃ"."×÷Ϊ·Ö¸ôµÄ»°£¬±ØÐëÊÇÈçÏÂд·¨£ºString.split("\\."),ÕâÑù²ÅÄÜÕýÈ·µÄ·Ö¸ô¿ª£¬²»ÄÜÓÃString.split(".");
2¡¢Èç¹ûÓÃ"|"×÷Ϊ·Ö¸ôµÄ»°£¬±ØÐëÊÇÈçÏÂд·¨£ºString.split("\\|"),ÕâÑù²ÅÄÜÕýÈ·µÄ·Ö¸ô¿ª£¬²»ÄÜÓÃString.split("|");
"."ºÍ" ......
1. ¸ÅÊö
±¾ÎÄÖ÷Òª°üÀ¨ÒÔϼ¸¸ö·½Ã棺±àÂë»ù±¾ÖªÊ¶£¬java£¬ÏµÍ³Èí¼þ£¬url£¬¹¤¾ßÈí¼þµÈ¡£
ÔÚÏÂÃæµÄÃèÊöÖУ¬½«ÒÔ"ÖÐÎÄ"Á½¸ö×ÖΪÀý£¬¾²é±í¿ÉÒÔÖªµÀÆäGB2312±àÂëÊÇ"d6d0 cec4"£¬Unicode±àÂëΪ"4e2d 6587"£¬UTF±àÂë¾ÍÊÇ"e4b8ad e69687"¡£×¢Ò⣬ÕâÁ½¸ö×ÖûÓÐiso8859-1±àÂ룬µ«¿ÉÒÔÓÃiso8859-1±àÂëÀ´"±íʾ"¡£
2. ±àÂë»ù±¾ÖªÊ ......
Ubuntu/debian ¸ü¸ÄĬÈÏJava»·¾³
ÎҵĵçÄÔÀï°²×°ÁËÁ½¸ö°æ±¾µÄJava£¬Ò»¸öÊÇjava-6-sun£¬»¹ÓÐÒ»¸öÊÇjava-gcj
gcjÊÇÔÚJVM·Ç³£»ºÂýµÄʱºòµ®ÉúµÄ£¬Ëû¿ÉÒÔ°ÑJava´úÂë±àÒë³É±¾µØ´úÂë £¬¹ØÓÚgcjÔÝÇÒ˵Õâô¶à£¬»Øµ½Ö÷Ìâ¡£
ÐÞ¸ÄĬÈÏjava»·¾³Óõ½ÃüÁîupdate-java-alternatives
1¡¢Ê¹ÓÃupdate-java-alternatives -l²é¿´Ä¿Ç°ÒѾ°²×° ......