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: j(UX
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CountBean.java GF9ZL
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/* aJ% e'F[
* CountData.java v] W1F,u
* ~x9 W{B]
* Created on 2007年1月1日, 下午4:44 deHY8x5uI
* 1Qrm"TFo
* To change this template, choose Tools | Options and locate the template under 0<6rU
* the Source Creation and Management node. Right-click the template and choose k?z
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* Open. You can then make changes to the template in the Source Editor. ;e`D#khB
*/ F<H`8*q9
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package com.tot.count; FA<Z37:
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/** w;z@py
* N}eU.#L
* @author E5v|SFD
*/ 5EVB27k
public class CountBean { x)%% 5
private String countType; QYFN:XZ
int countId; +5N^TnBtBL
/** Creates a new instance of CountData */ '33Yl+h
public CountBean() {} ,APGPE}I[
public void setCountType(String countTypes){ KE&InTM/j
this.countType=countTypes; Q;{D8 #!
} ?w c3+?\J
public void setCountId(int countIds){ :*^(OnIe
this.countId=countIds; c"oQ/x
} ;+aDjO2(
public String getCountType(){ 3D[:Rf[
return countType; ,3g]=f
} Cb!`0%G
public int getCountId(){ N6-2*ES
return countId; =6L:Ix
} )w3XN A_V
} Q_UCF'f;}
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CountCache.java OsHkAI
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/* RBHqLg(
* CountCache.java 'Sb6
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* A[wxa
* Created on 2007年1月1日, 下午5:01 6+{ nw}e8
* r5X BcG(2
* To change this template, choose Tools | Options and locate the template under O23]!S<;
* the Source Creation and Management node. Right-click the template and choose x1 R!
* Open. You can then make changes to the template in the Source Editor. 2={K-s20
*/ oPC IlH
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package com.tot.count; HY%6eUhj
import java.util.*; 'J&@jp
/** cfO^CC
* )f_"`FH0d
* @author k[^}ld[
*/
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public class CountCache { "O"^\f
public static LinkedList list=new LinkedList(); d-K5nRyI
/** Creates a new instance of CountCache */ h P6fTZ=Ln
public CountCache() {} Yg:74; .
public static void add(CountBean cb){ 5y
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if(cb!=null){ oM?
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list.add(cb); $`+~QR!h
} F".IB^}$
} joSr,'x
} 7\|NYT4
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CountControl.java gIf+.^/m1
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/* c^q O@%s
* CountThread.java x]jdx#'
* 6iAc@
* Created on 2007年1月1日, 下午4:57 dwsy(g7
* FKvO7? K
* To change this template, choose Tools | Options and locate the template under Q Kuc21
* the Source Creation and Management node. Right-click the template and choose N]P*6sf-6
* Open. You can then make changes to the template in the Source Editor. cJp1 <R
*/ Dv\:b*
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package com.tot.count; +T8XX@#
import tot.db.DBUtils; l{7Dv1[Ss
import java.sql.*; u/c~PxC
/** y<gYf -E+
* !h~#L"z
* @author SBB
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*/ )jQe K
public class CountControl{ 4s+J-l
private static long lastExecuteTime=0;//上次更新时间 /hj9Q!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 KE|u}M@v6
/** Creates a new instance of CountThread */ 2>_LX!kyP]
public CountControl() {} +cplM5X
public synchronized void executeUpdate(){ L"zgBB?K6
Connection conn=null; myo~Qqt?
PreparedStatement ps=null; 4m g
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try{ ]t!}D6p
conn = DBUtils.getConnection(); '-1jWw:8
conn.setAutoCommit(false); l Ib>t
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }5c'ui!3H
for(int i=0;i<CountCache.list.size();i++){ CSg5i&A=
CountBean cb=(CountBean)CountCache.list.getFirst(); k=q%FlE
CountCache.list.removeFirst(); `OpC-Z&
ps.setInt(1, cb.getCountId()); 9#$V1(}?
ps.executeUpdate();⑴ *Uw#
//ps.addBatch();⑵ 5]O LV1Xt
} zdQu%q
//int [] counts = ps.executeBatch();⑶ =v#A&IPA'
conn.commit(); J$=b&$I(
}catch(Exception e){ l8
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e.printStackTrace(); /3:IE%o
} finally{ YdL1(|EdM
try{ ,EJ [I^
if(ps!=null) { Y_iF$m/R
ps.clearParameters(); e+[J[<8
ps.close(); fw~%^*
ps=null; [T?6~^m=
} :^.8 7>V7
}catch(SQLException e){} j$ i8@]
DBUtils.closeConnection(conn); wP *a>a
} FYE9&{]h
} !z6/.>QJ~
public long getLast(){ 6'lT`E|
return lastExecuteTime; [q|Q]O0
} #mFAl|O
public void run(){ ^V;lZtZ
long now = System.currentTimeMillis(); Ognq*[om
if ((now - lastExecuteTime) > executeSep) { q8yJW-GA
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,%DAh
//System.out.print(" now:"+now+"\n"); JdNPfkOF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Env}g CX
lastExecuteTime=now; a9q?9X
executeUpdate();
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} O5n]4)<
else{ BE@H~<E J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 3<Y;mA=hw
} sn-+F%[
} :usBeho
} !urd
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//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 [tw<TV"\
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类写好了,下面是在JSP中如下调用。 9'L0Al~L
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<% f$*9J
CountBean cb=new CountBean(); nf@u7*#6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); M/`z;a=EP
CountCache.add(cb); gJfL$S'w
out.print(CountCache.list.size()+"<br>"); ,OFr]74\
CountControl c=new CountControl(); Vy*Z"k
c.run(); !suiqP1\*
out.print(CountCache.list.size()+"<br>"); 5v-;*
%>