锘??xml version="1.0" encoding="utf-8" standalone="yes"?><rss version="2.0" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/" xmlns:wfw="http://wellformedweb.org/CommentAPI/" xmlns:slash="http://purl.org/rss/1.0/modules/slash/"><channel><title>&#20037;&#20037;&#20037;&#20122;&#27954;&#31934;&#21697;&#22269;&#20135;&#44;&#20122;&#27954;&#31934;&#21697;&#22825;&#22530;&#22312;&#32447;&#35266;&#30475;&#44;&#20122;&#27954;&#20013;&#25991;&#23383;&#24149;&#26080;&#30721;&#27704;&#20037;&#22312;&#32447;</title><link>http://m.tkk7.com/Jhonney/archive/2010/06/25/324503.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Fri, 25 Jun 2010 11:30:00 GMT</pubDate><guid>http://m.tkk7.com/Jhonney/archive/2010/06/25/324503.html</guid><wfw:comment>http://m.tkk7.com/Jhonney/comments/324503.html</wfw:comment><comments>http://m.tkk7.com/Jhonney/archive/2010/06/25/324503.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.tkk7.com/Jhonney/comments/commentRss/324503.html</wfw:commentRss><trackback:ping>http://m.tkk7.com/Jhonney/services/trackbacks/324503.html</trackback:ping><description><![CDATA[<p>$ sqlplus user/pass </p>
<p>SQL*Plus: Release 9.2.0.6.0 - Production on Wed Aug 2 17:38:39 2006 </p>
<p>Copyright (c) 1982, 2002, Oracle Corporation.&nbsp; All rights reserved. </p>
<p><br />
Connected to:<br />
Oracle9i Enterprise Edition Release 9.2.0.6.0 - 64bit Production<br />
With the Partitioning, OLAP and Oracle Data Mining options<br />
JServer Release 9.2.0.6.0 - Production </p>
<p>SQL&gt; select * from wwm2;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --瑕佹洿鏂扮殑琛?</p>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
111&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ww'jj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
llll&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
dddd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div><br />
SQL&gt; select * from wwm5;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --鏇存柊鐨勬潯浠惰〃</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
test&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 9984</div>
<div>SQL&gt; select wwm2.* from wwm2,wwm5 where wwm2.id=wwm5.id<br />
&nbsp; 2&nbsp; /</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
111&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ww'jj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
dsafdf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
3435&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>8 rows selected.</div>
<div>鎵�浠?姣忔闇�瑕佹洿鏂?鏉℃暟鎹氨鏄紜殑.</div>
<div>鐩鎬俊紼嬪簭鍛樻槸閫氳繃浠ヤ笅綾諱技鐨凷QL鏇存柊鐨?榪欐槸閿欒鐨?鍥犱負娌℃湁鍔燱HERE<br />
SQL&gt;&nbsp; update wwm2 set wwm2.town=(select wwm5.town from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp; 2&nbsp; /</div>
<div>13 rows updated.</div>
<div>SQL&gt; select * from wwm2;</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
13 rows selected.</div>
<div>鍙互鐪嬪埌13鏉¤褰曡鏇存柊,絎﹀悎鏉′歡鐨勬洿鏂版紜?涓嶇鍚堟潯浠剁殑涔熸洿鏂頒負NULL.浠ヤ笅鏄紜殑鏂規硶</div>
<div>鏂規硶涓�:<br />
SQL&gt; update wwm2<br />
&nbsp; 2&nbsp; set town=(select town from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp; 3&nbsp; where id=(select wwm5.id from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp; 4&nbsp; /</div>
<div>8 rows updated.</div>
<div>鏂規硶浜?&nbsp;&nbsp;&nbsp; 涓庢柟娉曚竴閬撶悊鐩稿悓,榪欓噷闇�瑕佹帉鎻XIST鐨勭浉鍏崇敤娉?<br />
SQL&gt; update wwm2<br />
&nbsp;&nbsp; set town=(select town from wwm5 where wwm5.id=wwm2.id)<br />
&nbsp;&nbsp; where exists (select 1 from wwm5 where wwm5.id=wwm2.id)<br />
8 rows updated.</div>
<div>鏂規硶涓?<br />
SQL&gt; update (select a.town atown,a.id aid,b.town btown,b.id bid from wwm2 a,wwm5 b where a.id=b.id)<br />
&nbsp; 2&nbsp; set atown=btown<br />
&nbsp; 3&nbsp; /<br />
set atown=btown<br />
&nbsp;&nbsp;&nbsp; *<br />
ERROR at line 2:<br />
ORA-01779: cannot modify a column which maps to a non key-preserved table</div>
<div>&nbsp; 1* alter table wwm5 add primary key (id)<br />
SQL&gt; /</div>
<div>Table altered.</div>
<div>&nbsp; 1&nbsp; update (select a.town atown,a.id aid,b.town btown,b.id bid from wwm2 a,wwm5 b where a.id=b.id)<br />
&nbsp; 2*&nbsp; set atown=btown<br />
SQL&gt; /</div>
<div>8 rows updated.</div>
<div>榪欑鏂規硶鐨勫眬闄愭�у氨鏄渶瑕丳RIMARY 鐨勬敮鎸?</div>
<div>鏂規硶鍥?<br />
&nbsp; 1&nbsp; declare<br />
&nbsp; 2&nbsp; cursor cur_wwm is select town,id from wwm5;<br />
&nbsp; 3&nbsp; begin<br />
&nbsp; 4&nbsp;&nbsp;&nbsp;&nbsp; for my_wwm in cur_wwm loop<br />
&nbsp; 5&nbsp;&nbsp;&nbsp;&nbsp; update wwm2 set town=my_wwm.town<br />
&nbsp; 6&nbsp;&nbsp;&nbsp;&nbsp; where id=my_wwm.id;<br />
&nbsp; 7&nbsp;&nbsp;&nbsp;&nbsp; end loop;<br />
&nbsp; 8* end;<br />
SQL&gt; /</div>
<div>PL/SQL procedure successfully completed.</div>
<div>SQL&gt; select * from wwm2;</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
llll&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
dddd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div>榪欎釜鏂規硶鏄渶鐏墊椿鐨勪簡.</div>
<div>鏂規硶浜?</div>
<div>娉ㄦ剰,鏂規硶浜斿彧鑳介�傜敤浜嶹WM5鏄疻WM2鐨勫瓙闆嗙殑鏃跺�?<br />
&nbsp; 1&nbsp;&nbsp; merge into wwm2<br />
&nbsp; 2&nbsp;&nbsp; using (select town,id from wwm5) b<br />
&nbsp; 3&nbsp;&nbsp; on (wwm2.id=b.id)<br />
&nbsp; 4&nbsp;&nbsp; when matched then update set town=b.town<br />
&nbsp; 5* when not matched then insert (town,id) values (null,null)<br />
SQL&gt; /</div>
<div>9 rows merged.</div>
<div>SQL&gt; select * from wwm2;</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ---娉ㄦ剰榪欎釜鍦版柟,琚彃鍏ヤ簡涓�涓┖鍊?鍥犱負WWM5鐨処D=9984鍦╓WM2涓笉鑳藉尮閰?鏍規湰鍘熷洜鏄疧RACLE9蹇呴』鏈塛HEN NOT MATCHED瀛愬彞,浣嗘槸ORACLE10鍙互涓嶈瑕?涔熷氨鏄疧RACLE10鍙互涓嶅啓WHEN NOT MATCHED ,灝變笉蹇呮彃鍏ULL鍊間簡,涓鴻В鍐寵繖涓棶棰?涓嬩竴姝ヤ細DELETE WWM5鐨処D=9984,榪欐牱涓�鏉ュ氨涓嶄細鎵цWHEN NOT MATCHED<br />
222&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
llll&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1111<br />
dddd&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2222<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div>TOWN&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ID<br />
-------------------- ----------<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
lllldf&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 111<br />
ljjjjj&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 222</div>
<div>14 rows selected.</div>
<div>SQL&gt; delete from wwm5 where id=9984;</div>
<div>1 row deleted.</div>
<div>SQL&gt;&nbsp; 1&nbsp;&nbsp; merge into wwm2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br />
SQL&gt;&nbsp;&nbsp; 2&nbsp;&nbsp; using (select town,id from wwm5) b<br />
SQL&gt;&nbsp;&nbsp; 3&nbsp;&nbsp; on (wwm2.id=b.id)<br />
SQL&gt;&nbsp;&nbsp; 4&nbsp;&nbsp; when matched then update set town=b.town<br />
SQL&gt;&nbsp;&nbsp; 5* when not matched then insert (town,id) values (null,null)<br />
SQL&gt; /</div>
<div>8 rows merged.</div>
<div>&nbsp;</div>
<div>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 浠ヤ笂灝辨槸5縐嶅叧榪炴洿鏂扮殑渚嬪瓙浜?甯屾湜鑳界粰寮�鍙戜漢鍛樿В鎯?</div>
<div>&nbsp;</div>
<div><strong>璇存槑錛氬鏋渟elect 瀛愬彞鍙互榪斿洖澶氳璁板綍錛屼絾榪斿洖閫傚悎where鏉′歡鐨勮褰曞彧鑳芥槸鍞竴鐨勶紝鍚﹀垯灝嗕細鎶ヨ繑鍥炲崟琛岀殑select瀛愬彞榪斿洖澶氳鐨勯敊璇紝鍥犱負update鍙兘璺熸嵁姝ゅ鐨剋here瀛愬彞錛堝唴灞倃here)榪涜鐩稿簲璁板綍鐨勫尮閰嶆洿鏂幫紝涓�嬈″彧鑳芥槸涓�鏉°�?/strong></div>
<img src ="http://m.tkk7.com/Jhonney/aggbug/324503.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/Jhonney/" target="_blank">Jhonney</a> 2010-06-25 19:30 <a href="http://m.tkk7.com/Jhonney/archive/2010/06/25/324503.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>銆愬師鍒涖�戣嚜宸卞啓鐨勪竴涓垎欏電▼搴?/title><link>http://m.tkk7.com/Jhonney/archive/2008/04/26/196108.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Fri, 25 Apr 2008 16:48:00 GMT</pubDate><guid>http://m.tkk7.com/Jhonney/archive/2008/04/26/196108.html</guid><wfw:comment>http://m.tkk7.com/Jhonney/comments/196108.html</wfw:comment><comments>http://m.tkk7.com/Jhonney/archive/2008/04/26/196108.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.tkk7.com/Jhonney/comments/commentRss/196108.html</wfw:commentRss><trackback:ping>http://m.tkk7.com/Jhonney/services/trackbacks/196108.html</trackback:ping><description><![CDATA[<p>騫村垵鏃跺府鏈嬪弸鍐欎簡鍒嗛〉紼嬪簭錛屼富瑕佺敱浜庤�冭檻鍒頒粬鐨勫簲鐢ㄦ暟鎹噺寰堝ぇ<br />
紼嬪簭鍏冩棪鏃跺凡瀹屾垚錛屼篃鎳掑緱鍙戝嚭鏉?br />
澶т綋鎬濇兂錛氬垎欏電殑鏍稿績鎬濇兂閲囩敤Iterator妯″紡錛屾瘡嬈′粠鏁版嵁搴撲腑鍙栧畾閲忕殑鏁版嵁鍧?br />
鍏朵腑block鍜宲ageCount鏄袱涓笉鍚岀殑姒傚康錛宐lock鏄潡錛岃瀹氫簡浠庢暟鎹簱涓幏鍙栫殑鏁伴噺<br />
pageCount涓鴻〃鐜板眰姣忛〉鏄劇ず鐨勬暟閲?br />
鍙﹀鍙傛暟涓繕鍖呭惈緙撳瓨鐨勬椂闂寸殑璁劇疆<br />
紼嬪簭鍒嗘牳蹇僯ar鍖呭拰嫻嬭瘯鍖咃紝嫻嬭瘯鍖呬互SPring涓哄熀紜�妗嗘灦<br />
http://www.chinadforce.com/viewthread.php?tid=878261&amp;extra=page%3D4<br />
</p>
<img src ="http://m.tkk7.com/Jhonney/aggbug/196108.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/Jhonney/" target="_blank">Jhonney</a> 2008-04-26 00:48 <a href="http://m.tkk7.com/Jhonney/archive/2008/04/26/196108.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>classloader鎬葷粨</title><link>http://m.tkk7.com/Jhonney/archive/2008/04/04/190798.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Fri, 04 Apr 2008 08:45:00 GMT</pubDate><guid>http://m.tkk7.com/Jhonney/archive/2008/04/04/190798.html</guid><wfw:comment>http://m.tkk7.com/Jhonney/comments/190798.html</wfw:comment><comments>http://m.tkk7.com/Jhonney/archive/2008/04/04/190798.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.tkk7.com/Jhonney/comments/commentRss/190798.html</wfw:commentRss><trackback:ping>http://m.tkk7.com/Jhonney/services/trackbacks/190798.html</trackback:ping><description><![CDATA[欏圭洰鏃墮渶瑕佸澶栨彁渚涗竴浜涙湇鍔℃帴鍙ｏ紝鍐欎簡鎺ュ彛鍙婂叾瀹炵幇鍙戠幇鎶astClassException錛屽綋鏃秐ewInstance鏃墮噰鐢?br />
Thread.currentContext.getClassLoader鐨勫艦寮忥紝鍒嗘瀽浜嗕竴涓嬪彂鐜板鉤鍙伴噰鐢ㄤ簡鑷繁鐨刢lassloader<br />
<br />
1.java鐨刢lassloader閲囩敤鍙屼翰濮旀墭鐨勬満鍒?br />
2.褰撳墠綾誨姞杞藉櫒鍜岀嚎紼嬩笂涓嬫枃鐨勫尯鍒槸錛屽綋鍓嶇被鍔犺澆鍣ㄥ湪鍔犺澆caller綾繪椂宸茬粡紜畾錛屼絾thread's context classloader is modifiable<br />
3.thread's classloader can break through the parent delegation mechanism of classloader<br />
4.it is should keep the thread's classloader same as current class classloader<br />
5.the default form of class.forname isn't recommend,because of exception of initializing static field if the classloader is not<br />
destroied<br />
6.banq comment about adoption thread's&nbsp; classloader is not correctly<br />
<br />
<img src ="http://m.tkk7.com/Jhonney/aggbug/190798.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/Jhonney/" target="_blank">Jhonney</a> 2008-04-04 16:45 <a href="http://m.tkk7.com/Jhonney/archive/2008/04/04/190798.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>璧板嚭ClassLoader榪峰</title><link>http://m.tkk7.com/Jhonney/archive/2008/03/23/187966.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sat, 22 Mar 2008 18:57:00 GMT</pubDate><guid>http://m.tkk7.com/Jhonney/archive/2008/03/23/187966.html</guid><wfw:comment>http://m.tkk7.com/Jhonney/comments/187966.html</wfw:comment><comments>http://m.tkk7.com/Jhonney/archive/2008/03/23/187966.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.tkk7.com/Jhonney/comments/commentRss/187966.html</wfw:commentRss><trackback:ping>http://m.tkk7.com/Jhonney/services/trackbacks/187966.html</trackback:ping><description><![CDATA[<span style="font-family: 瀹嬩綋;">quto:http://m.tkk7.com/lihuaxajh/articles/94371.html<br />
other resources:<br />
&nbsp;&nbsp;&nbsp; 1.http://www.javaworld.com/javaworld/javaqa/2003-06/01-qa-0606-load.html?page=1<br />
&nbsp;&nbsp;&nbsp; 2.http://www.javaworld.com/javaworld/javaqa/2003-06/01-qa-0606-load.html?page=2&nbsp;&nbsp;  <br />
&nbsp;&nbsp;&nbsp; 3.http://www.javaworld.com/javaworld/javaqa/2003-03/01-qa-0314-forname.html<br />
&nbsp;&nbsp;&nbsp; 4.http://www.theserverside.com/news/thread.tss?thread_id=40763<br />
&nbsp;&nbsp;&nbsp; 5.http://www.matrix.org.cn/resource/article/43/43875_Class_Loading.html<br />
&nbsp;&nbsp;&nbsp; 6.http://blog.sina.com.cn/s/blog_4b6047bc0100096v.html<br />
&nbsp;&nbsp;&nbsp; 7.http://blog.sina.com.cn/s/blog_4b6047bc0100097p.html<br />
榪欎釜闂緇忓父鍑虹幇鍦ㄧ紪鍐欐鏋朵唬鐮?/span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">闇�瑕佸姩鎬佸姞杞藉緢澶氱被鍜岃祫婧愮殑鏃跺�?/span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">閫氬父褰撲綘闇�瑕佸姩鎬佸姞杞借祫婧愮殑鏃跺�?/span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">浣犺嚦灝戞湁涓変釜</span>
<span lang="EN-US">ClassLoader</span>
<span style="font-family: 瀹嬩綋;">鍙互閫夋嫨</span>
<span lang="EN-US">: </span>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<ol>
    <li><span style="font-family: Wingdings;" lang="EN-US">
    <span><span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp; </span></span></span><span style="font-family: 瀹嬩綋;">緋葷粺綾誨姞杞藉櫒鎴栧彨浣滃簲鐢ㄧ被鍔犺澆鍣?/span>
    <span style="font-family: Wingdings;" lang="EN-US">(system classloader or application classloader)</span></li>
    <li><span style="font-family: Wingdings;" lang="EN-US"><span><span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;</span></span></span><span style="font-family: 瀹嬩綋;">褰撳墠綾誨姞杞藉櫒</span><span style="font-family: Wingdings;" lang="EN-US"></span></li>
    <li><span style="font-family: Wingdings;" lang="EN-US"><span><span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;</span></span></span><span style="font-family: 瀹嬩綋;">褰撳墠綰跨▼綾誨姞杞藉櫒</span></li>
</ol>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;">涓婇潰鐨勯棶棰樻寚鐨勬槸鏈�鍚庝竴縐嶇被鍔犺澆鍣?/span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">鍝綾誨姞杞藉櫒鏄紜殑閫夋嫨鍛?/span>
<span lang="EN-US">?</span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; text-indent: 21pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;">絎竴縐嶉�夋嫨鍙互寰堝鏄撳湴鎺掗櫎</span>
<span lang="EN-US">: </span>
<span style="font-family: 瀹嬩綋;">緋葷粺綾誨姞杞藉櫒</span>
<span lang="EN-US">(system classloader). </span>
<span style="font-family: 瀹嬩綋;">榪欎釜綾誨姞杞藉櫒澶勭悊</span>
<span lang="EN-US">-classpath</span>
<span style="font-family: 瀹嬩綋;">涓嬬殑綾誨姞杞藉伐浣?/span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">鍙互閫氳繃</span>
<span lang="EN-US">ClassLoader.getSystemClassLoader()</span>
<span style="font-family: 瀹嬩綋;">鏂規硶璋冪敤</span>
<span lang="EN-US">. ClassLoader</span>
<span style="font-family: 瀹嬩綋;">涓嬫墍鏈夌殑</span>
<span lang="EN-US">getSystemXXX()</span>
<span style="font-family: 瀹嬩綋;">鐨勯潤鎬佹柟娉曢兘鏄�氳繃榪欎釜鏂規硶瀹氫箟鐨?/span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">鍦ㄤ綘鐨勪唬鐮佷腑</span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">浣犲簲璇ュ敖閲忓皯鍦拌皟鐢ㄨ繖涓柟娉?/span>
<span lang="EN-US">,</span>
<span style="font-family: 瀹嬩綋;">浠ュ叾瀹冪殑綾誨姞杞藉櫒浣滀負浠ｇ悊</span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">鍚﹀垯浣犵殑浠ｇ爜灝嗗彧鑳藉伐浣滃湪綆�鍗曠殑鍛戒護琛屽簲鐢ㄤ腑</span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">榪欎釜鏃跺�欑郴緇熺被鍔犺澆鍣?/span>
<span lang="EN-US">(system classloader)</span>
<span style="font-family: 瀹嬩綋;">鏄?/span>
<span lang="EN-US">JVM</span>
<span style="font-family: 瀹嬩綋;">鏈�鍚庡垱寤虹殑綾誨姞杞藉櫒</span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">涓�浣嗕綘鎶婁唬鐮佺Щ鍒?/span>
<span lang="EN-US">EJB, Web</span>
<span style="font-family: 瀹嬩綋;">搴旂敤鎴?/span>
<span lang="EN-US">Java Web Start</span>
<span style="font-family: 瀹嬩綋;">搴旂敤涓?/span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">涓�瀹氫細鍑洪棶棰?/span>
<span lang="EN-US">. </span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span lang="EN-US">
<span>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">鎵�浠ユ垜浠潵鐪嬬浜岀閫夋嫨</span>
<span lang="EN-US">: </span>
<span style="font-family: 瀹嬩綋;">褰撳墠涓婁笅鏂囩幆澧冧笅鐨勭被鍔犺澆鍣?/span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">鏍規嵁瀹氫箟</span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">褰撳墠綾誨姞杞藉櫒灝辨槸浣犲綋鍓嶆柟娉曟墍灞炵殑綾葷殑鍔犺澆鍣?/span>
<span lang="EN-US">. </span>
<span style="font-family: 瀹嬩綋;">鍦ㄨ繍琛屾椂綾諱箣闂村姩鎬佽仈緙?/span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">鍙婅皟鐢?/span>
<span lang="EN-US">Class.forName,() Class.getResource()</span>
<span style="font-family: 瀹嬩綋;">絳夌被浼兼柟娉曟椂</span>
<span lang="EN-US">, </span>
<span style="font-family: 瀹嬩綋;">榪欎釜綾誨姞杞藉櫒浼氳闅愬惈鍦頒嬌鐢?/span>
<span lang="EN-US">. </span>
<span style="color: #ffcc00; font-family: 瀹嬩綋;" lang="EN-US">It is also used by syntactic constructs like X.class class literals.</span>
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<o:p>
</o:p>
</span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">綰跨▼涓婁笅鏂囩被鍨嬪姞杞藉櫒鏄湪<span lang="EN-US">Java 2</span>騫沖彴涓婅寮曞叆鐨?span lang="EN-US">. </span>姣忎竴涓嚎紼嬮兘鏈変竴涓被鍔犺澆鍣ㄤ笌涔嬪搴?span lang="EN-US">(</span>闄ら潪榪欎釜綰跨▼鏄鏈湴浠ｇ爜鍒涘緩鐨?span lang="EN-US">). </span>榪欎釜綾誨姞杞藉櫒鏄�氳繃<span lang="EN-US">Thread.setContextClassLoaser()</span>鏂規硶璁劇疆鐨?span lang="EN-US">. </span>濡傛灉浣犱笉鍦ㄧ嚎紼嬫瀯閫犲悗璋冪敤榪欎釜鏂規硶<span lang="EN-US">, </span>榪欎釜綰跨▼灝嗕粠瀹冪殑鐖剁嚎紼嬩腑緇ф壙鐩稿簲鐨勪笂涓嬫枃綾誨姞杞藉櫒<span lang="EN-US">. </span>濡傛灉鍦ㄦ暣涓簲鐢ㄤ腑浣犱笉鍋氫換浣曠壒孌婅緗?span lang="EN-US">, </span>鎵�鏈夌殑綰跨▼灝嗛兘浠ョ郴緇熺被鍔犺澆鍣?span lang="EN-US">(system classloader)</span>浣滀負鑷繁鐨勭嚎紼嬩笂涓嬫枃綾誨姞杞藉櫒<span lang="EN-US">. </span>鑷粠<span lang="EN-US">Web</span>鍜?span lang="EN-US">J2EE</span>搴旂敤鏈嶅姟鍣ㄤ嬌鐢ㄦ垚鐔熺殑綾誨姞杞藉櫒鏈哄埗鏉ュ疄鐜拌濡?span lang="EN-US">JNDI, </span>綰跨▼姹?span lang="EN-US">, </span>緇勪歡鐑儴緗茬瓑鍔熻兘浠ユ潵<span lang="EN-US">, </span>榪欑鍦ㄦ暣涓簲鐢ㄤ腑涓嶅仛浠諱綍綰跨▼綾誨姞杞藉櫒璁劇疆鐨勬儏鍐靛氨寰堝皯浜?span lang="EN-US">.<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">涓轟粈涔堢嚎紼嬩笂涓嬫枃綾誨姞杞藉櫒瀛樺湪浜庡姝ら噸瑕佺殑浣嶇疆鍛?span lang="EN-US">? </span>榪欎釜姒傚康鍦?span lang="EN-US">J2SE</span>涓殑寮曞叆騫朵笉寮曚漢娉ㄧ洰<span lang="EN-US">. </span>寰堝寮�鍙戜漢鍛樺榪欎竴姒傚康榪鋒儜鐨勫師鍥犳槸<span lang="EN-US">Sun</span>鍏徃鍦ㄨ繖鏂歸潰緙轟箯閫傚綋鐨勬寚寮曞拰鏂囨。<span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">浜嬪疄涓?span lang="EN-US">, </span>涓婁笅鏂囩被鍔犺澆鍣ㄦ彁渚涗簡綾誨姞杞芥満鍒剁殑鍚庨棬<span lang="EN-US">, </span>榪欎竴鐐逛篃鍦?span lang="EN-US">J2SE</span>涓寮曞叆浜?span lang="EN-US">. </span>閫氬父<span lang="EN-US">, </span>鍦?span lang="EN-US">JVM</span>涓殑鎵�鏈夌被鍔犺澆鍣ㄨ緇勭粐鎴愪簡鏈夌戶鎵垮眰嬈＄殑緇撴瀯<span lang="EN-US">, </span>姣忎竴涓被鍔犺澆鍣?span lang="EN-US">(</span>闄や簡寮曞<span lang="EN-US">JVM</span>鐨勫師濮嬬被鍔犺澆鍣?span lang="EN-US">)</span>閮芥湁涓�涓埗鍔犺澆鍣?span lang="EN-US">. </span>姣忓綋琚紺哄姞杞界被鏃?span lang="EN-US">, </span>綾誨姞杞藉櫒閮戒細棣栧厛璇鋒眰鍏剁埗綾誨姞杞藉櫒<span lang="EN-US">, </span>鍙湁褰撶埗綾誨姞杞藉櫒涓嶈兘鍔犺澆鏃?span lang="EN-US">, </span>鎵嶄細鑷繁榪涜綾誨姞杞?span lang="EN-US">.<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">鏈夋椂鍊欒繖縐嶇被鍔犺澆鐨勯『搴忓畨鎺掍笉鑳芥甯稿伐浣?span lang="EN-US">, (<font color="#3300cc">姝?
澶勭殑鎰忔�濇槸:姝ｅ父鎯呭喌涓嬮兘鏄粠瀛愮被鍔犺澆鍣ㄥ埌鏍圭被鍔犺澆鍣ㄨ姹?涓囦竴鏈夋牴綾婚噷闇�瑕佸姞杞藉瓙綾繪椂,榪欑欏哄簭灝變笉鑳芥弧瓚寵姹?灝辮鏈変竴鏉″弽鍚戠殑閫氶亾,鍗沖緱鍒板瓙綾誨姞杞?
鍣?榪欐牱灝辯敤鍒頒簡thread context
classloader,鍥犱負閫氳繃thread.getcontextclassloader()鍙互寰楀埌瀛愮被鍔犺澆鍣?/font>).</span>閫氬父褰撳繀欏誨姩鎬佸姞杞藉簲鐢ㄧ▼搴忓紑鍙戜漢鍛樻彁渚涚殑璧勬簮鐨勬椂鍊?span lang="EN-US">. </span>浠?span lang="EN-US">JNDI</span>涓轟緥<span lang="EN-US">: </span>瀹冪殑鍐呭<span lang="EN-US">(</span>浠?span lang="EN-US">J2SE1.3</span>寮�濮?span lang="EN-US">)</span>灝卞湪<span lang="EN-US">rt.jar</span>涓殑寮曞綾諱腑瀹炵幇浜?span lang="EN-US">, </span>浣嗘槸榪欎簺<span lang="EN-US">JNDI</span>鏍稿績綾婚渶瑕佸姩鎬佸姞杞界敱鐙珛鍘傚晢瀹炵幇騫墮儴緗插湪搴旂敤紼嬪簭鐨?span lang="EN-US">classpath</span>涓嬬殑<span lang="EN-US">JNDI</span>鎻愪緵鑰?span lang="EN-US">. </span>榪欑鎯呭喌灝辮姹備竴涓埗<span lang="EN-US">classloader(</span>鏈緥<span lang="EN-US">, </span>灝辨槸寮曞綾誨姞杞藉櫒<span lang="EN-US">)</span>鍘誨姞杞藉浜庡畠鍏朵腑涓�涓瓙<span lang="EN-US">classloader(</span>鏈緥<span lang="EN-US">, </span>緋葷粺綾誨姞杞藉櫒<span lang="EN-US">)</span>鍙鐨勭被<span lang="EN-US">. </span>榪欐椂閫氬父鐨勭被鍔犺澆浠ｇ悊鏈哄埗涓嶈兘瀹炵幇榪欎釜瑕佹眰<span lang="EN-US">. </span>瑙ｅ喅鐨勫姙娉?span lang="EN-US">(workaround)</span>灝辨槸<span lang="EN-US">, </span>璁?span lang="EN-US">JNDI</span>鏍稿績綾諱嬌鐢ㄥ綋鍓嶇嚎紼嬩笂涓嬫枃鐨勭被鍔犺澆鍣?span lang="EN-US">, </span>榪欐牱<span lang="EN-US">, </span>灝卞熀鏈殑綾誨姞杞戒唬鐞嗘満鍒剁殑鐩稿弽鏂瑰悜寤虹珛浜嗕竴鏉℃湁鏁堢殑閫斿緞<span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">鍙﹀<span lang="EN-US">, </span>涓婇潰涓�孌靛彲鑳借浣犳兂璧蜂竴浜涘叾瀹冪殑浜嬫儏<span lang="EN-US">: XML</span>瑙ｆ瀽<span lang="EN-US">Java API(JAXP). </span>鏄殑<span lang="EN-US">, </span>褰?span lang="EN-US">JAXP</span>鍙槸<span lang="EN-US">J2SE</span>鐨勬墿灞曡繘<span lang="EN-US">, </span>瀹冨緢鑷劧鍦扮敤褰撳墠綾誨姞杞藉櫒鏉ュ紩瀵艱В鏋愬櫒鐨勫疄鐜?span lang="EN-US">. </span>鑰屽綋<span lang="EN-US">JAXP</span>琚姞鍏ュ埌<span lang="EN-US">J2SE1.4</span>鐨勬牳蹇冪被搴撲腑鏃?span lang="EN-US">, </span>瀹冪殑綾誨姞杞戒篃灝辨敼鎴愪簡鐢ㄥ綋鍓嶇嚎紼嬬被鍔犺澆鍣?span lang="EN-US">, </span>涓?span lang="EN-US">JNDI</span>鐨勬儏鍐靛畬鍏ㄧ被浼?span lang="EN-US">(</span>涔熶嬌寰堝紼嬪簭鍛樺緢榪鋒儜<span lang="EN-US">). </span>鏄庣櫧涓轟粈涔堟垜璇存潵鑷?span lang="EN-US">Sun</span>鐨勬寚瀵煎緢緙轟箯浜嗗惂<span lang="EN-US">?<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">鍦ㄤ互涓婄殑浠嬬粛涔嬪悗<span lang="EN-US">, </span>鎴戜滑鏉ョ湅鍏抽敭闂<span lang="EN-US">: </span>榪欎袱縐嶉�夋嫨<span lang="EN-US">(</span>褰撳墠綾誨姞杞藉櫒鍜屽綋鍓嶇嚎紼嬬被鍔犺澆鍣?span lang="EN-US">)</span>閮戒笉鏄湪鎵�鏈夌幆澧冧笅閮介�傜敤<span lang="EN-US">. </span>鏈変簺浜鴻涓哄綋鍓嶇嚎紼嬬被鍔犺澆鍣ㄥ簲璇ユ垚涓烘柊鐨勬爣鍑嗙瓥鐣?span lang="EN-US">. </span>浣嗘槸<span lang="EN-US">, </span>濡傛灉榪欐牱<span lang="EN-US">, </span>褰撳涓嚎紼嬮�氳繃鍏變韓鏁版嵁榪涜浜や簰鐨勬椂<span lang="EN-US">, </span>灝嗕細鍛堢幇鍑轟竴騫呮瀬鍏跺鏉傜殑綾誨姞杞界殑鐢婚潰<span lang="EN-US">, </span>闄ら潪瀹冧滑鍏ㄩ儴浣跨敤浜嗗悓涓�涓笂涓嬫枃鐨勭被鍔犺澆鍣?span lang="EN-US">. </span>榪涗竴姝ヨ<span lang="EN-US">, </span>鍦ㄦ煇浜涢仐鐣欎笅鏉ョ殑瑙ｅ喅鏂規涓?span lang="EN-US">, </span>濮旀淳鍒板綋鍓嶇被鍔犺澆鍣ㄧ殑鏂規硶宸茬粡鏄爣鍑?span lang="EN-US">. </span>姣斿瀵?span lang="EN-US">Class.forName(String)</span>鐨勭洿鎺ヨ皟鐢?span lang="EN-US">(</span>榪欎篃鏄垜涓轟粈涔堟帹鑽愬敖閲忛伩鍏嶅榪欎釜鏂規硶榪涜璋冪敤鐨勫師鍥?span lang="EN-US">). </span>鍗充嬌浣犲姫鍔涘幓鍙皟鐢ㄤ笂涓嬫枃鐩稿叧鐨勭被鍔犺澆鍣?span lang="EN-US">, </span>浠嶇劧浼氭湁涓�浜涗唬鐮佷細涓嶇敱浣犳帶鍒?span lang="EN-US">. </span>榪欑涓嶅彈鎺у埗鐨勭被鍔犺澆濮旀淳鏈哄埗鏄販鍏ユ槸寰堝嵄闄╃殑<span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">鏇翠弗閲嶇殑闂<span lang="EN-US">, </span>鏌愪簺搴旂敤鏈嶅姟鍣ㄦ妸鐜涓婁笅鏂囧強褰撳墠綾誨姞杞藉櫒璁劇疆鍒頒笉鍚岀殑綾誨姞杞藉櫒瀹炰緥涓?span lang="EN-US">, </span>鑰岃繖浜涚被鍔犺澆鍣ㄦ湁鐩稿悓鐨勭被璺緞浣嗗嵈娌℃湁濮旀淳鏈哄埗涓殑鐖跺瓙鍏崇郴<span lang="EN-US">. </span>鎯蟲兂榪欎負浠�涔堝崄鍒嗗彲鎬?span lang="EN-US">. </span>瑕佺煡閬撶被鍔犺澆鍣ㄥ畾涔夊茍鍔犺澆鐨勭被瀹炰緥浼氬甫鏈変竴涓?span lang="EN-US">JVM</span>鍐呴儴鐨?span lang="EN-US">ID</span>鍙?span lang="EN-US">. </span>濡傛灉褰撳墠綾誨姞杞藉櫒鍔犺澆涓�涓被<span lang="EN-US">X</span>鐨勫疄渚?span lang="EN-US">, </span>榪欎釜瀹炰緥璋冪敤<span lang="EN-US">JNDI</span>鏌ユ壘綾?span lang="EN-US">Y</span>鐨勫疄渚?span lang="EN-US">, </span>浜涙椂鐨勪笂涓嬫枃鐨勭被鍔犺澆鍣ㄤ篃鍙互瀹氫箟浜嗗姞杞界被<span lang="EN-US">Y</span>瀹炰緥<span lang="EN-US">. </span>榪欎釜綾?span lang="EN-US">Y</span>鐨勫畾涔夊氨涓庡綋鍓嶇被鍔犺澆鍣ㄧ湅鍒扮殑綾?span lang="EN-US">Y</span>鐨勫畾涔変笉鍚?span lang="EN-US">. </span>濡傛灉榪涜寮哄埗綾誨瀷杞崲<span lang="EN-US">, </span>鍒欎駭鐢熷紓甯?span lang="EN-US">. <o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt; line-height: 150%;">
<span style="font-family: 瀹嬩綋;" lang="EN-US">
<span>&nbsp;&nbsp; </span>
</span>
<span style="font-family: 瀹嬩綋;">榪欑娣蜂貢鐨勬儏鍐佃繕灝嗗湪<span lang="EN-US">Java</span>涓瓨鍦ㄤ竴孌墊椂闂?span lang="EN-US">. </span>瀵逛簬閭ｄ簺闇�瑕佸姩鎬佸姞杞借祫婧愮殑<span lang="EN-US">J2SE</span>鐨?span lang="EN-US">API, </span>鎴戜滑鏉ョ寽鎯沖畠浠殑綾誨姞絳栫暐<span lang="EN-US">. </span>渚嬪<span lang="EN-US">:<o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: 瀹嬩綋;" lang="EN-US">JNDI</span>
<span style="font-family: 瀹嬩綋;">浣跨敤綰跨▼涓婁笅鏂囩被鍔犺澆鍣?span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: 瀹嬩綋;" lang="EN-US">Class.getResource()</span>
<span style="font-family: 瀹嬩綋;">鍜?span lang="EN-US">Class.forName()</span>浣跨敤褰撳墠綾誨姞杞藉櫒<span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: 瀹嬩綋;" lang="EN-US">JAXP(J2SE 1.4</span>
<span style="font-family: 瀹嬩綋;">鍙婁箣鍚?span lang="EN-US">)</span>浣跨敤綰跨▼涓婁笅鏂囩被鍔犺澆鍣?span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: 瀹嬩綋;" lang="EN-US">java.util.ResourceBundle</span>
<span style="font-family: 瀹嬩綋;">浣跨敤璋冪敤鑰呯殑褰撳墠綾誨姞杞藉櫒<span lang="EN-US"><o:p></o:p></span></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="color: #ffcc00; font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="color: #ffcc00; font-family: 瀹嬩綋;" lang="EN-US">URL
protocol handlers specified via java.protocol.handler.pkgs system
property are looked up in the bootstrap and system classloaders only<o:p></o:p></span>
</p>
<p class="MsoNormal" style="margin: 0cm 0cm 0pt 42pt; text-indent: -21pt; line-height: 150%;">
<span style="font-family: Wingdings;" lang="EN-US">
<span>&#216;<span style="font-family: 'Times New Roman'; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>
</span>
<span style="font-family: 瀹嬩綋;" lang="EN-US">Java</span>
<span style="font-family: 瀹嬩綋;">搴忓垪鍖?span lang="EN-US">API</span>榛樿浣跨敤璋冪敤鑰呭綋鍓嶇殑綾誨姞杞藉櫒<span lang="EN-US"><o:p></o:p></span></span>
</p>
<span style="font-family: 瀹嬩綋;">榪欎簺綾誨強璧勬簮鐨勫姞杞界瓥鐣ラ棶棰?span lang="EN-US">, </span>鑲畾鏄?span lang="EN-US">J2SE</span>棰嗗煙涓枃妗ｆ渶鍙婅鏄庢渶緙轟箯鐨勯儴鍒嗕簡<span lang="EN-US">.</span></span>
<img src ="http://m.tkk7.com/Jhonney/aggbug/187966.html" width = "1" height = "1" /><br><br><div align=right><a style="text-decoration:none;" href="http://m.tkk7.com/Jhonney/" target="_blank">Jhonney</a> 2008-03-23 02:57 <a href="http://m.tkk7.com/Jhonney/archive/2008/03/23/187966.html#Feedback" target="_blank" style="text-decoration:none;">鍙戣〃璇勮</a></div>]]></description></item><item><title>classloader</title><link>http://m.tkk7.com/Jhonney/archive/2008/03/23/187959.html</link><dc:creator>Jhonney</dc:creator><author>Jhonney</author><pubDate>Sat, 22 Mar 2008 16:19:00 GMT</pubDate><guid>http://m.tkk7.com/Jhonney/archive/2008/03/23/187959.html</guid><wfw:comment>http://m.tkk7.com/Jhonney/comments/187959.html</wfw:comment><comments>http://m.tkk7.com/Jhonney/archive/2008/03/23/187959.html#Feedback</comments><slash:comments>0</slash:comments><wfw:commentRss>http://m.tkk7.com/Jhonney/comments/commentRss/187959.html</wfw:commentRss><trackback:ping>http://m.tkk7.com/Jhonney/services/trackbacks/187959.html</trackback:ping><description><![CDATA[classloader 鍜宑lass.forname鐨勫尯鍒?br />
欏圭洰涓紝鍙戠敓浜哻lasscast寮傚父錛屾簮鐮佸鍐欑殑鏄疶hread.currentThread<span id="pnhldno"    class="tpc_content">.getContextClassLoader<br />
鍚庢潵鏀規垚class.forname鍚嶰K鍟?br />
</span>
<div style="border: 1px solid #cccccc; padding: 4px 5px 4px 4px; background-color: #eeeeee; font-size: 13px; width: 98%;"><!--<br />
<br />
Code highlighting produced by Actipro CodeHighlighter (freeware)<br />
http://www.CodeHighlighter.com/<br />
<br />
--><span style="color: #000000;">Class.forName(String&nbsp;clz);<br />
浣跨敤璋冪敤榪欎釜璇彞鐨勫璞℃墍浣跨敤鐨凜lassLoader浣滀負ClassLoader(</span><span style="color: #000000;">1</span><span style="color: #000000;">)銆?br />
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鐨勭被瑁呰澆鍣ㄩ兘闅忔椂鍙互閫氳繃hread.currentThread().setContextClassLoader(loader)榪涜鏀瑰彉(鍙?銆?/span></div>
紼嬪簭涓嚭鐜扮殑閿欒錛屽彲鑳芥槸鐢變簬騫沖彴鐨刢lassloader鏄彟涓�濂楁満鍒?br />
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                        A comprehensive look at this broken programming idiom
                        
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2005N<br />
鍘熷鏀懼嚭2006.07涓栫邯鏃朵唬璁哄潧</p>
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<p>MD5錛?6c029d7c10bfb1b9ce1c7034d882a21<br />
2004N<br />
鍘熷鏀懼嚭ISO錛?004.09&nbsp;&nbsp; 瑗垮畨浜ゅぇXXX</p>
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md5錛?2c244a48e70b80c6baa014ca33b68ed<br />
2006N<br />
鍘熷鏀懼嚭2006.10鐢甸涓�鍙嬶細Bxx xxxxx</p>
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MD5錛歟38f4e392a7798aao15fa95c50ff573d<br />
鍜孧D5錛?7505544DB716B451DB6CC33F1ABC0E3<br />
鏄悓涓�鎵圭洏銆?/p>
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<table style="table-layout: fixed">
    <tbody>
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            <td>
            <div   id="oodffoy"   class="cnt">
            <p>Dell OEM XP SP2鐨勫師鐗堥暅鍍忥細</p>
            <p>1.2004騫村彴寮忔満鍘熺増錛歁D5 66c029d7c10bfb1b9ce1c7034d882a21</p>
            <p>2.2005騫寸瑪璁版湰鍘熺増錛歁D5 57505544DB716B451DB6CC33F1ABC0E3</p>
            <p>3.2006騫村師鐗堬細MD5 62c244a48e70b80c6baa014ca33b68ed</p>
            <p>闈炲師鐗堬細</p>
            <p>1.772MB鐨勯偅涓墍璋撶殑2006.04鐗?/p>
            <p>2.MD5 97E6327A45A86D62E40F38504B4BB01A<br />
            </p>
            </div>
            </td>
        </tr>
    </tbody>
</table>
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