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: KdBpfPny@
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CountBean.java dEZUK vo
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/* RR+{uSO,t
* CountData.java byFO^pce
* \xlG 3nz
* Created on 2007年1月1日, 下午4:44 +Bf?3 5LP
* &|<f|BMX
* To change this template, choose Tools | Options and locate the template under B[I9<4}
* the Source Creation and Management node. Right-click the template and choose 84WX I#BH
* Open. You can then make changes to the template in the Source Editor. 5Xf]j=_
*/ nwp(% fBo
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package com.tot.count; P(3k1SM
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/** 1uO2I&B
* Sbl = U
* @author 9QaE)wt
*/ =ecLzk"+F
public class CountBean { |UlG@Mn
private String countType; $~S~pvT
int countId; Cs_&BSs
/** Creates a new instance of CountData */ *E*oWb]H
public CountBean() {} D<m0G]Ht*
public void setCountType(String countTypes){ cGiL9|k
this.countType=countTypes; i!zFW-*5
} wk ^7/B
public void setCountId(int countIds){ r\d(*q3B
this.countId=countIds; c}+*$DeT
} .[}G{%M~[
public String getCountType(){ LQHL4jRXU
return countType; .%s
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} e{7\pQK
public int getCountId(){ W&=OtN
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return countId; NNF"si\FE
} h~m,0nGO
} #]x3(}3W
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CountCache.java J Cq>;br.
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/* ]
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* CountCache.java `Bw]PO
* ^3TNj
* Created on 2007年1月1日, 下午5:01 +?Ii=* 7n
* 6,A|9UX=`
* To change this template, choose Tools | Options and locate the template under H.m]Dm,z
* the Source Creation and Management node. Right-click the template and choose iCPm7AU
* Open. You can then make changes to the template in the Source Editor. dgjK\pH`h
*/ O|V0WiY<
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package com.tot.count; N#K)Z5J)b
import java.util.*; 4LKpEl.=
/** d 2d-Mk
* Tb$))O}
* @author y)fMVD"(
*/ Qds<j{2
public class CountCache { lN#j%0MaUo
public static LinkedList list=new LinkedList(); =P]Z"Ok
/** Creates a new instance of CountCache */ &t^*0/~
public CountCache() {} pM?~AYWb
public static void add(CountBean cb){ :QGkYJ
if(cb!=null){ 6u0>3-[6OD
list.add(cb); LUbj^iQ9
} -Cs( 3[
}
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} Y(g_h:lf,]
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CountControl.java XM`GK>*aC(
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/* ?4bYb]8Z
* CountThread.java bzFac5n)Q
* >qo!#vJc
a
* Created on 2007年1月1日, 下午4:57 x95s%29RS
* p^pd7)sBr
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose h$&Tg_/'#D
* Open. You can then make changes to the template in the Source Editor. H?=W]<!W{y
*/ 5@2Rl>B$
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package com.tot.count; Ddr.6`VJ
import tot.db.DBUtils; gAD f9x"b
import java.sql.*; ::>|[ND
/** X5iD<Lh
* ~JT`q:l-q
* @author ] 0X|_bU
*/ ?>;aD
public class CountControl{ G}8tFo.d1
private static long lastExecuteTime=0;//上次更新时间 4
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 C}h(WOcr`X
/** Creates a new instance of CountThread */ `
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public CountControl() {} 0`x>p6.)G
public synchronized void executeUpdate(){ AkQ(V
Connection conn=null; 46=E- Tq
PreparedStatement ps=null; rWTaCU^qV
try{ \p(S4?I7
conn = DBUtils.getConnection(); m^QoB
conn.setAutoCommit(false); _<(xjWp 8
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2 nyK'k
for(int i=0;i<CountCache.list.size();i++){ 28"1ONs3
CountBean cb=(CountBean)CountCache.list.getFirst(); VZi1b0k1.
CountCache.list.removeFirst(); p& _Z}Wv
ps.setInt(1, cb.getCountId()); #&'S-XE+
ps.executeUpdate();⑴ tg\Nm7I
//ps.addBatch();⑵ GrLxERf
} y~+LzDV
//int [] counts = ps.executeBatch();⑶ sWlxt q g
conn.commit(); t{]
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}catch(Exception e){ d~aTjf
e.printStackTrace(); ArtY;.cg%
} finally{ 0eA<nK
try{ hoFgs9
if(ps!=null) { !V.]mI
ps.clearParameters(); ~ EBaVl ({
ps.close(); 2H`r:x<Z-
ps=null; ec!e
} mfj{_fR3
}catch(SQLException e){} X"TL'"?fo
DBUtils.closeConnection(conn); ] V/5<O1
} q]="ek&_
} E:9RskI
public long getLast(){ DghyE`
return lastExecuteTime; >&.N_,*
} &`m.]RV
public void run(){ 'l/l]26rO4
long now = System.currentTimeMillis(); &MX&5@
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if ((now - lastExecuteTime) > executeSep) { j
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//System.out.print("lastExecuteTime:"+lastExecuteTime); 1|p\rHGd
//System.out.print(" now:"+now+"\n"); <sC(a7i1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); fQ 9af)d
lastExecuteTime=now; NuO@Nr
executeUpdate(); DNmC
} oc"p5Y3,Os
else{ Zna6-0o
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); tV=Qt[|@
} ?*~
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} [\ku,yd%0
} $(62j0mS>
//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 @{IX
do
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类写好了,下面是在JSP中如下调用。 UT@Qo}:
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<% <IZr..|O
CountBean cb=new CountBean(); S_sHwObFu|
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); $D`Kz*/.
out.print(CountCache.list.size()+"<br>"); OkRb3}
CountControl c=new CountControl();
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c.run(); <\~@l^lU
out.print(CountCache.list.size()+"<br>"); +IXr4M&3
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