用Java实现断点续传(HTTP)
)断点续传的原理
其实断点续传的原理很简单，就是在Http的请求上和一般的下载有所不同而已。
打个比方，浏览器请求服务器上的一个文时，所发出的请求如下：
-using Java HTTP (HTTP)) HTTP fact, the principle of HTTP principle is simple enough. Shan is the Http requests and generally download some variations. For example, the browser requests to the server on a text, issued by the request as follows :
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001383s ]
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:0.085476s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001171s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001955s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001158s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003619s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001011s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003316s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014534s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001340s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 44235 [ RunTime:0.001358s ]
