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: ]Te,m}E
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CountBean.java 9o<5Z=
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/* "MX9h }7
* CountData.java vlSSw+r9
* ;GF+0~5>
* Created on 2007年1月1日, 下午4:44 Eb.k:8?Tn
* /Y_)dz^@
* To change this template, choose Tools | Options and locate the template under wUJ>?u9
* the Source Creation and Management node. Right-click the template and choose H7Y :l0b
* Open. You can then make changes to the template in the Source Editor. E,wOWs*
*/ _7=LSf,9
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package com.tot.count; tH^]`6"QUa
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/** s"-gnW
* l1#F1q`^t
* @author }T1.~E
*/ FA7q
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public class CountBean { U,7O{YM
private String countType; 4Uzx2
int countId; 2, R5mL$
/** Creates a new instance of CountData */ UVz}"TRq.
public CountBean() {} 1n-+IR"
public void setCountType(String countTypes){ FofeQ
this.countType=countTypes; H:5- S
} d,+a}eTP'
public void setCountId(int countIds){ Q xm:5P
this.countId=countIds; )0UXTyw^
} ~M Mv+d88
public String getCountType(){ AR?1_]"=
return countType; L<H zPg
} LAjreC<W
public int getCountId(){ RIV
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return countId; n5s2\(
} 6*r#m%|
} |SSe n#PYp
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CountCache.java t;/s^-}
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/* J*nWCL
* CountCache.java 1ww#]p`1
* mi'3ibCG
* Created on 2007年1月1日, 下午5:01 ~/m=Q<cV
* E=$li
* To change this template, choose Tools | Options and locate the template under Mo4k6@ht_
* the Source Creation and Management node. Right-click the template and choose D@?Tq,=
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* Open. You can then make changes to the template in the Source Editor. >p?Vv0*
*/ ^=@`U_(,G
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package com.tot.count; j[Z<|Da
import java.util.*; -POsbb>
/** <;P40jDL
* Zp qb0ro
* @author H7?Sd(U
*/ q<Z`<e
public class CountCache { c5- 56Q
public static LinkedList list=new LinkedList(); {NTMvJLm
/** Creates a new instance of CountCache */ D&-cNxh
public CountCache() {} a%XF"*^v
public static void add(CountBean cb){ eo&^~OVT
if(cb!=null){ q. s'z}
list.add(cb); L&LAh&%{2
} dBb
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} P0<)E
} H{U(Rt]K
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CountControl.java ,?oC+9w
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/* `NB6Of*/
* CountThread.java :D:Y-cG*n<
* F XG,DJ:
* Created on 2007年1月1日, 下午4:57 =x3T+)qCNX
* %}[/lIxaE
* To change this template, choose Tools | Options and locate the template under # ~(lY}
* the Source Creation and Management node. Right-click the template and choose %@MO5#)NI
* Open. You can then make changes to the template in the Source Editor. Lu5lpeSQ
*/ *|({(aZ
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package com.tot.count; ;|r<mT/,
import tot.db.DBUtils; =HHtLW.|,
import java.sql.*; hEMS
/** :3A^5}iz
* AOv>O52F/Q
* @author ]47!Zo,
*/ n=A}X4^
public class CountControl{ ["0DXm%t
private static long lastExecuteTime=0;//上次更新时间 ',m!L@7M5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 bR*}
s/
/** Creates a new instance of CountThread */ RXw }Tb/D8
public CountControl() {} pF<KhE*V
public synchronized void executeUpdate(){ `dJ?j[P,p
Connection conn=null; MHQM'
PreparedStatement ps=null; ( q}{;
try{ OfPv'rW{x
conn = DBUtils.getConnection(); ;U[W $w[
conn.setAutoCommit(false); 7-("ppYX=
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); b NR@d'U
for(int i=0;i<CountCache.list.size();i++){ 2Kz407|'
CountBean cb=(CountBean)CountCache.list.getFirst(); .1F41UyL
CountCache.list.removeFirst(); ^KUM4.
6
ps.setInt(1, cb.getCountId()); &Pe[kCO]
ps.executeUpdate();⑴ s8+{##"1
q
//ps.addBatch();⑵ EYR%u'&7'
} t*wV<b
//int [] counts = ps.executeBatch();⑶ Q`!<2i;
conn.commit(); M,sZ8eeq
}catch(Exception e){ \2[sUY<W
e.printStackTrace(); Vo(>K34
} finally{ (nAg
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try{ Jix;!("
if(ps!=null) { ODCv^4}9
ps.clearParameters(); lS |:4U.
ps.close(); @m+FAdA 0
ps=null; icN#8\E
} R47tg&k6[
}catch(SQLException e){} TXbnK"XQ
DBUtils.closeConnection(conn); g`I$U%a_2
} m+3]RIr&A
} 51'{Jx8
public long getLast(){ ?o`fX
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return lastExecuteTime; gr \vC
} C )BVsHT4
public void run(){ ^ 2LqKo\T
long now = System.currentTimeMillis(); (".WJXB\
if ((now - lastExecuteTime) > executeSep) { 8V@\$4@b!#
//System.out.print("lastExecuteTime:"+lastExecuteTime); C]M{
//System.out.print(" now:"+now+"\n"); plgiQr #
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 7VW/v4n
lastExecuteTime=now; IPk"{T3
executeUpdate(); C
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} 'tY y_
else{ ,~>u<Wc!S
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Bxk2P<d
} CGs5`a
} 4?Qc&e{5
} b5?k)s2
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 PJ2m4ulY
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类写好了,下面是在JSP中如下调用。 ;aImz*1%t
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<% _Kg"l5?B
CountBean cb=new CountBean(); "#]V^Rzxh
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); So]O`RJv
CountCache.add(cb); qbKcI+)47
out.print(CountCache.list.size()+"<br>"); YJ{_%z|U
CountControl c=new CountControl(); q],/%W
c.run(); mhMRY9 ahB
out.print(CountCache.list.size()+"<br>"); 4IXa[xAm
%>