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来源: BlogBus 原始链接: http://www.blogbus.com:80/blogbus/blog/index.php?blogid=4212 存档链接: https://web.archive.org/web/20041207034057id_/http://www.blogbus.com:80/blogbus/blog/index.php?blogid=4212

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DigesterÒ²»á´æÔÚһЩÐÔÄÜÎÊÌ⡱¡£ÔÚдÁËһЩ´úÂëÖ®ºó£¬ÎÒÏë¿´¿´Í¨¹ýµ÷Õû£¬ÐÔÄÜ¿ÉÒÔÓÐÔõÑùµÄÌá¸ß¡£ Commons DigesterÐèÒªµÄÊÇÒ»¸ö¡°Ä£Ê½£¨pattern£©/¹æÔò£¨rule£©¡±µÄ×éºÏ£¬Ä£Ê½ÃèÊöÁË´¦ÀíÖÐÓöµ½µÄ±êÇ©£¬¹æÔòÔò˵Ã÷ÁËÔõÑù´¦ÀíÕâ¸ö±êÇ©¡£Commons DigesterÌṩÁËÐí¶àȱʡµÄ¹æÔò£¬ÎÒÃÇ¿ÉÒÔÓÃÀ´¼ò»¯ÎÒÃǵĿª·¢£¬ÎªÁ˴ﵽͨÓõÄÄ¿µÄ£¬ÕâЩȱʡ¹æÔò´óÁ¿µÄʹÓÃÁËReflection£¬ËüÃÇÒ²ÕýÊÇÎÒËù¹Ø×¢µÄÎÊÌâ¡£ ÏÂÃæÊÇÒ»¸öXMLÎļþÖеÄÒ»¶Î£º ÔÚ´¦Àíʱ£¬ÎÒÒª°ÑËüÓ³ÉäΪÄÚ´æ¶ÔÏ󣬿ÉÄܾÍÐèÒªÓöµ½student±êÇ©Ö®ºó´´½¨Ò»¸öStudentµÄÄÚ´æ¶ÔÏó£¬È»ºó£¬¸øËüÉèÖÃnameÊôÐÔ£¬Èç¹ûÓöµ½ÁËcourse£¬³ýÁË´´½¨¶ÔÏóºÍÉèÖÃÊôÐÔÍ⣬ÎÒ»¹ÐèÒª°ÑËüºÍStudent¶ÔÏó¹ØÁªÆðÀ´¡£ ʹÓÃȱʡ¹æÔò£¬ÎÒ¿ÉÄÜ»áÕâôÅäÖ㺠Digester digester = new Digester(); digester.addObjectCreate("student", Student.class); digester.addSetProperties("student"); digester.addObjectCreate("student/course", Course.class); digester.addSetProperties("student/course"); digester.addSetNext("student/course", "addCourse"); ÏÖÔڰѳéÏó±äΪ¾ßÌ壬ÏÔÈ»ÕâЩĬÈϹæÔò¾Í²»ÊÇÎÒËùÐèÒªµÄ£¬ÎÒ±àдÁË×Ô¼ºµÄ¹æÔò£º public class StudentRule extends Rule { public void begin(String namespace, String name, Attributes attributes) throws Exception { Student student = new Student(); String studentName = attributes.getValue("name"); student.setName(studentName); digester.push(student); } public void end(String namespace, String name) throws Exception { digester.pop(); } } ÀàËƵĻ¹ÓÐÒ»¸öcourseµÄ¹æÔò£¬ÕâÑùÔ­À´µÄÅäÖþͱäΪ Digester digester = new Digester(); digester.addRule("student", new StudentRule()); digester.addRule("student/course", new CourseRule()); ÔÚÎÒ²âÊԵijÌÐòÖУ¬²ÉÓÃȱʡ¹æÔò½âÎöÒ»¸öÎļþÓÃÁË580ms£¬¶ø×Ô¶¨Òå¹æÔòÓÃ200ms£¬¶þÕߵIJî¾à»¹ÊDZȽÏÃ÷ÏԵġ£ ÄÄÖÖ½â¾ö·½°¸»á³ÉΪÎÒ×îÖÕµÄÑ¡ÔñÄØ£¿½ö´Ó½á¹ûÉÏÀ´¿´£¬ÎÒºÁÎÞÒÉÎʸÃÑ¡Ôñ×Ô¶¨Òå¹æÔò£¬»»×÷¼¸ÄêÇ°µÄÎÒ£¬Õâ¿ÖÅÂÊÇûʲôֵµÃÖÊÒɵġ£ÏÖÔÚµÄÎÒÊ×ÏÈ»áÎÊ×Ô¼ºÒ»Ï£¬ÎÒÒª¸Éʲô¡£ÒòΪȱʡ¹æÔò²¢·ÇÒ»ÎÞÊÇ´¦£¬Í¬×Ô¶¨Òå¹æÔòÏà±È£¬ËüµÄÓÅÊÆÔÚÓÚÁé»î£¬ÎÒÃDz»±Øά»¤´óÁ¿µÄ¹æÔò£¬¶øÇÒ»¹¿ÉÒÔ¸ü½øÒ»²½£¬°Ñ½âÎö¹æÔòÒ²ÅäÖõ½ÅäÖÃÎļþÖУ¬ÒòΪCommons DigesterÒѾ­ÌṩÁËÕâÖÖÖ§³Ö¡£ 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