有时要为每一篇文章统计其点击次数,如果每一次浏览都要更新一次库的话,那性能在访问量很大的情况下,服务器的压力就会很大了,比较好一点的方法就是先将要更新的数据缓存起来,然后每隔一段时间再利用数据库的批量处理,批量更新库。源码如下: i&F~=Q`
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CountBean.java /Dd\PjIH{
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/* cIZc:
* CountData.java FLbZ9pX}
* Baq ~}B<
* Created on 2007年1月1日, 下午4:44 [}k|
* &l^n4
* To change this template, choose Tools | Options and locate the template under BR3mAF
* the Source Creation and Management node. Right-click the template and choose wixD\t59X
* Open. You can then make changes to the template in the Source Editor. rgR?wXW]jE
*/ elKx]%k*)
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package com.tot.count; i7v/A&Rc
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/** *PcVSEP/0
* @,6ST0xT (
* @author &wGg6$
*/ rt;gC[3\
public class CountBean { vl~%o@*_
private String countType; HWbBChDF
int countId; (4ZLpsbJ
/** Creates a new instance of CountData */ W:B }u\)C
public CountBean() {} =
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public void setCountType(String countTypes){ @^HwrwRA
this.countType=countTypes; RK3.-
} fk\5D[j^
public void setCountId(int countIds){ 6aSM*S)
this.countId=countIds; _h~p:=
} Q!)z)-hI
public String getCountType(){ bw;iz,Z
return countType; 1}DerX 6
} :|($,3*
public int getCountId(){ It\BbG=
return countId; -d_ 7*>m$
} &Q+]t"OA!
} rG5i-'
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CountCache.java ;qG1r@o
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/* [J:zE&aj
* CountCache.java ahoh9iJ
* 'Z$jBL
* Created on 2007年1月1日, 下午5:01 Zih5/I
* g5<ZS3tQ
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose VS%@)sI|Z
* Open. You can then make changes to the template in the Source Editor. hs,5LV)|y
*/ r&/D~g\"|[
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package com.tot.count; $l43>e{E
import java.util.*; v['AB4
/** af^@
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* Yoe les-
* @author nO:HB.&@
*/ CH#kvR2
public class CountCache { ZK!4>OuH`
public static LinkedList list=new LinkedList(); y8D 8Y8B
/** Creates a new instance of CountCache */ >+f'!*%7He
public CountCache() {} F]Pul|.l
public static void add(CountBean cb){ lk~dgky@
if(cb!=null){ q"l>`KCG`
list.add(cb); HMQ'b(a'
} ~Cu lFxu
} (A|B@a!Y>
} o:f|zf>
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CountControl.java y,1S&k
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/* h
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* CountThread.java z.{HD9TD
* ~|qXtds$
* Created on 2007年1月1日, 下午4:57 Do(PdF6A
* zo87^y5?G
* To change this template, choose Tools | Options and locate the template under .0KOnLdK
* the Source Creation and Management node. Right-click the template and choose I(y`)$}
* Open. You can then make changes to the template in the Source Editor. 0A@-9w=u
*/ "1\(ZKG8^Q
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package com.tot.count; Jn60i6/
import tot.db.DBUtils; wo$|~
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import java.sql.*; (kdC1,E
/** ?<g|.HY/
* @s3aR*ny$
* @author bQ
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*/ 3l.Nz@a*
public class CountControl{ #Xj;f^}/
private static long lastExecuteTime=0;//上次更新时间 /S/tE
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 KgL<}=S
/** Creates a new instance of CountThread */ +i2YX7Of
public CountControl() {} rR3m'[
public synchronized void executeUpdate(){ EF0Pt
Connection conn=null; `g2&{)3k
PreparedStatement ps=null; 6{lG1\o
try{ '=-s1c@^
conn = DBUtils.getConnection(); b ^+Fs
conn.setAutoCommit(false); ,q/tyGj
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); G)4ZK#wz
for(int i=0;i<CountCache.list.size();i++){ ipgN<|`?@
CountBean cb=(CountBean)CountCache.list.getFirst(); B?!9W@
CountCache.list.removeFirst(); .$n$%|"H-
ps.setInt(1, cb.getCountId()); w
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ps.executeUpdate();⑴ KC#kss
//ps.addBatch();⑵ J,.j_ii`!
} |qQ{ 8T%)
//int [] counts = ps.executeBatch();⑶ ;,()wH
conn.commit(); 5XhK#X%:A
}catch(Exception e){ i#Ne'q;T
e.printStackTrace(); ll 6]W~[ZC
} finally{ {/th`#o4b
try{ (X0`1s
if(ps!=null) { $(Z]TS$M&
ps.clearParameters(); G* 8+h
ps.close(); C+ZQB)gn
ps=null; 'nC3:U
} ab8oMi`z
}catch(SQLException e){} m*Q[lr=
DBUtils.closeConnection(conn); Q@ykQ
} hg$qbeUl
} ecM4]U
public long getLast(){ "``W6W-(
return lastExecuteTime; ^ uKnP>*l
} Fc34Y0_A
public void run(){ Q:'qw#P/C
long now = System.currentTimeMillis(); ]Y?{$M
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if ((now - lastExecuteTime) > executeSep) { bS_y_9K
//System.out.print("lastExecuteTime:"+lastExecuteTime); uEc0/a :.
//System.out.print(" now:"+now+"\n"); cfrvy^>,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ~| 4U@
lastExecuteTime=now; p} t{8j>
executeUpdate(); V=G b>_d
} pil0,r
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else{ )< &B