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]]>- Javaä¸çš„基本概念åQˆPOåQŒVOåQŒPOJOåQŒDTOåQŒDAOåQ?/title><link>http://www.aygfsteel.com/jzgl-ever/articles/217600.html</link><dc:creator>freedoom</dc:creator><author>freedoom</author><pubDate>Fri, 25 Jul 2008 16:02:00 GMT</pubDate><guid>http://www.aygfsteel.com/jzgl-ever/articles/217600.html</guid><wfw:comment>http://www.aygfsteel.com/jzgl-ever/comments/217600.html</wfw:comment><comments>http://www.aygfsteel.com/jzgl-ever/articles/217600.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://www.aygfsteel.com/jzgl-ever/comments/commentRss/217600.html</wfw:commentRss><trackback:ping>http://www.aygfsteel.com/jzgl-ever/services/trackbacks/217600.html</trackback:ping><description><![CDATA[<span id="wmqeeuq" class="hilite2">PO</span>:persistant objectæŒä¹…对象,å¯ä»¥çœ‹æˆæ˜¯ä¸Žæ•°æ®åº“ä¸çš„è¡¨ç›¸æ˜ ž®„çš„java对象。最½Ž€å•çš„<span id="wmqeeuq" class="hilite2">PO</span>ž®±æ˜¯å¯¹åº”æ•°æ®åº“ä¸æŸä¸ªè¡¨ä¸çš„一æ¡è®°å½•ï¼Œå¤šä¸ªè®°å½•å¯ä»¥ç”?span class="hilite2">PO</span>的集åˆã€?span class="hilite2">PO</span>ä¸åº”该ä¸åŒ…å«ä»ÖM½•å¯ÒŽ•°æ®åº“çš„æ“ä½? <br />
VO:value object值对象。通常用于业务层之间的数æ®ä¼ 递，å’?span class="hilite2">PO</span>ä¸€æ ·ä¹Ÿæ˜¯ä»…ä»…åŒ…å«æ•°æ®è€Œå·²ã€‚但应是抽象出的业务对象,å¯ä»¥å’Œè¡¨å¯¹åº”,也å¯ä»¥ä¸,˜q™æ ¹æ®ä¸šåŠ¡çš„需è¦?个äh觉得åŒDTO(æ•°æ®ä¼ 输对象),在webä¸Šä¼ é€? <br />
DAO:data access objectæ•°æ®è®‰K—®å¯¹è±¡åQŒæ¤å¯¹è±¡ç”¨äºŽè®‰K—®æ•°æ®åº“。通常å’?span class="hilite2">PO</span>¾l“åˆä½¿ç”¨åQŒDAOä¸åŒ…å«äº†å„ç§æ•°æ®åº“çš„æ“作æ–ÒŽ³•ã€‚通过它的æ–ÒŽ³•,¾l“åˆ<span id="wmqeeuq" class="hilite2">PO</span>å¯ÒŽ•°æ®åº“˜q›è¡Œç›¸å…³çš„æ“ä½? <br />
BO:business object业务对象,ž®è£…业务逻辑的java对象,通过调用DAOæ–ÒŽ³•,¾l“åˆ<span id="wmqeeuq" class="hilite2">PO</span>,VO˜q›è¡Œä¸šåŠ¡æ“作; <br />
<span id="wmqeeuq" class="hilite2">PO</span>JO:plain ordinary java object ½Ž€å•æ— 规则java对象,我个äºø™§‰å¾—它和其他ä¸æ˜¯ä¸€ä¸ªå±‚é¢ä¸Šçš„东è¥?VOå’?span class="hilite2">PO</span>应该都属于它. <br />
<br />
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<br />
<span id="wmqeeuq" class="hilite2">PO</span>åQ?<br />
persistant objectæŒä¹…对象 <br />
最形象的ç†è§£å°±æ˜¯ä¸€ä¸?span class="hilite2">PO</span>ž®±æ˜¯æ•°æ®åº“ä¸çš„一æ¡è®°å½•ã€?<br />
好处是å¯ä»¥æŠŠä¸€æ¡è®°å½•ä½œä¸ÞZ¸€ä¸ªå¯¹è±¡å¤„ç†ï¼Œå¯ä»¥æ–¹ä¾¿çš„è{为其它对象ã€?<br />
BOåQ?<br />
business object业务对象 <br />
主è¦ä½œç”¨æ˜¯æŠŠä¸šåŠ¡é€»è¾‘ž®è£…ä¸ÞZ¸€ä¸ªå¯¹è±¡ã€‚这个对象å¯ä»¥åŒ…括一个或多个其它的对象ã€?<br />
比如一个简历，有教育ç»åŽ†ã€å·¥ä½œç»åŽ†ã€ç¤¾ä¼?关系½{‰ç‰ã€?<br />
我们å¯ä»¥æŠŠæ•™è‚²ç»åŽ†å¯¹åº”一ä¸?span class="hilite2">PO</span>åQŒå·¥ä½œç»åŽ†å¯¹åº”一ä¸?span class="hilite2">PO</span>åQŒç¤¾ä¼?关系对应一ä¸?span class="hilite2">PO</span>ã€?<br />
建立一个对应简历的BO对象处熽Ž€åŽ†ï¼Œæ¯ä¸ªBO包嫘q™äº›<span id="wmqeeuq" class="hilite2">PO</span>ã€?<br />
˜q™æ ·å¤„ç†ä¸šåŠ¡é€»è¾‘æ—Óž¼Œæˆ‘们ž®±å¯ä»¥é’ˆå¯¹BOåŽÕd¤„ç†ã€?<br />
VO åQ?<br />
value object值对�<br />
ViewObject表现层对�<br />
主è¦å¯¹åº”ç•Œé¢æ˜„¡¤ºçš„æ•°æ®å¯¹è±¡ã€‚对于一个WEB™åµé¢åQŒæˆ–者SWTã€SWING的一个界é¢ï¼Œç”¨ä¸€ä¸ªVO对象对应整个界é¢çš„倹{€?<br />
DTO åQ?<br />
Data Transfer Objectæ•°æ®ä¼ 输对象 <br />
主è¦ç”¨äºŽ˜qœç¨‹è°ƒç”¨½{‰éœ€è¦å¤§é‡ä¼ 输对象的地方ã€?<br />
æ¯”å¦‚æˆ‘ä»¬ä¸€å¼ è¡¨æœ?00个嗌Dµï¼Œé‚£ä¹ˆå¯¹åº”çš?span class="hilite2">PO</span>ž®±æœ‰100个属性ã€?<br />
但是我们界é¢ä¸Šåªè¦æ˜¾½C?0个嗌Dµï¼Œ <br />
客户端用WEB serviceæ¥èŽ·å–æ•°æ®ï¼Œæ²¡æœ‰å¿…è¦æŠŠæ•´ä¸?span class="hilite2">PO</span>å¯¹è±¡ä¼ é€’åˆ°å®¢æˆ·ç«¯ï¼Œ <br />
˜q™æ—¶æˆ‘们ž®±å¯ä»¥ç”¨åªæœ‰˜q?0个属性的DTOæ¥ä¼ 递结果到客户端，˜q™æ ·ä¹Ÿä¸ä¼šæš´éœ²æœåŠ¡ç«¯è¡¨ç»“æž?到达客户端以åŽï¼Œå¦‚果用这个对象æ¥å¯¹åº”ç•Œé¢æ˜„¡¤ºåQŒé‚£æ¤æ—¶å®ƒçš„íw«ä†¾ž®Þp{为VO <br />
<span id="wmqeeuq" class="hilite2">PO</span>JO åQ?<br />
plain ordinary java object ½Ž€å•java对象 <br />
个äh感觉<span id="wmqeeuq" class="hilite2">PO</span>JO是最常è§æœ€å¤šå˜çš„对象，是一个ä¸é—´å¯¹è±¡ï¼Œä¹Ÿæ˜¯æˆ‘们最常打交é“的对象ã€?<br />
一ä¸?span class="hilite2">PO</span>JOæŒä¹…化以åŽå°±æ˜?span class="hilite2">PO</span> <br />
ç›´æŽ¥ç”¨å®ƒä¼ é€’ã€ä¼ 递过½E‹ä¸ž®±æ˜¯DTO <br />
直接用æ¥å¯¹åº”表示层就是VO <br />
DAOåQ?<br />
data access objectæ•°æ®è®‰K—®å¯¹è±¡ <br />
˜q™ä¸ªå¤§å®¶æœ€ç†Ÿæ‚‰åQŒå’Œä¸Šé¢å‡ 个O区别最大，基本没有互相转化的å¯èƒ½æ€§å’Œå¿…è¦. <br />
主è¦ç”¨æ¥ž®è£…å¯ÒŽ•°æ®åº“的访问。通过它å¯ä»¥æŠŠ<span id="wmqeeuq" class="hilite2">PO</span>JOæŒä¹…化äØ“<span id="wmqeeuq" class="hilite2">PO</span>åQŒç”¨<span id="wmqeeuq" class="hilite2">PO</span>¾l„装出æ¥VOã€DTO
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