使用3种设计模式：工厂模式，组合模式，策略模式，实现图像的切换。-The use of three kinds of design patterns: Factory pattern, combined model, strategy pattern, to achieve the image switching.
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Application test src nbproject dist build build.xml manifest.mf
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001228s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.094588s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.004270s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001295s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.000956s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003139s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000869s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003889s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015646s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001263s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 199232 [ RunTime:0.014348s ]
