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: ,G^[o,hS
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CountBean.java ^C&+
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/* 4"\yf
* CountData.java =j0x.fSe
* q&'Lbxc>c
* Created on 2007年1月1日, 下午4:44 /.5;in
* k6IG+:s
* To change this template, choose Tools | Options and locate the template under V[pvJ(
* the Source Creation and Management node. Right-click the template and choose A CNfS9M_w
* Open. You can then make changes to the template in the Source Editor. 2=PBxDs;
*/ ghk5rl$
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package com.tot.count; @D`zKYwX1
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/** N$?cX(|7
* !Q-wdzsp?
* @author M/V(5IoP(
*/ $mco0%$
public class CountBean { zvv:dC/p<
private String countType; )He#K+[}^4
int countId; NnxM3*
/** Creates a new instance of CountData */ %R0v5=2'
public CountBean() {} qUhRu>
public void setCountType(String countTypes){ xFp<7p
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this.countType=countTypes; +-068k(
} #`tD1T{;
public void setCountId(int countIds){
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this.countId=countIds; 'Tb0-1S?
} ?SY<~i<K-
public String getCountType(){ 71B3a
return countType; YTY%#"
} w#PZu+
public int getCountId(){ ZofHic
return countId; #_Ea[q7v
} 0rMqWP
} %/0gWG
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CountCache.java coQ[@vu
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/* -oBI+v&
* CountCache.java rFag@Z"["
* 9n}A ^
* Created on 2007年1月1日, 下午5:01 }(i(Ar-
* Mps
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* To change this template, choose Tools | Options and locate the template under H$!-f>Rxa
* the Source Creation and Management node. Right-click the template and choose 'ND36jHcRD
* Open. You can then make changes to the template in the Source Editor. C@dGWAG
*/ F%6*Df;cSe
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package com.tot.count; qR,.W/eS8
import java.util.*; *M!kA65'
/** |n P_<9[
* P!\hnm)%4
* @author lC9S\s
*/ UC9{m252
public class CountCache { !y vJpdsof
public static LinkedList list=new LinkedList(); (:?&G9k
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/** Creates a new instance of CountCache */ 'tWAu I
public CountCache() {} o<4D=.g7D
public static void add(CountBean cb){ 9G:TW|)L[Q
if(cb!=null){ 'XfgBJF=
list.add(cb); *m_93J
} Fn,k!q
} 9={N4}<
} Tx+ p8J|Yr
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CountControl.java #4y,a_)
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/* i>Iee^_(
* CountThread.java 7Jx%JgF
* )*[
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* Created on 2007年1月1日, 下午4:57 AUAI3K?
* d7~j^v)=^
* To change this template, choose Tools | Options and locate the template under 9y+[o
* the Source Creation and Management node. Right-click the template and choose NiTJ}1 l
* Open. You can then make changes to the template in the Source Editor. )1_(>|@oi
*/ :GL7J6
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package com.tot.count; '0Zm#g
import tot.db.DBUtils; XV2=8#R
import java.sql.*; jfSg){
/** N$'>XtO
* b[g.}'^yht
* @author {,f[r*{Y
*/ P3$,ca'
public class CountControl{ G.ud1,S#
private static long lastExecuteTime=0;//上次更新时间 IIP.yyh>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2Guvze_bU
/** Creates a new instance of CountThread */ <|JU(B
public CountControl() {} (UzPkl kZ
public synchronized void executeUpdate(){ S8*> kM'
Connection conn=null; [2H[5<tH
PreparedStatement ps=null; ,Oi^ySn
try{ .YiaXP
conn = DBUtils.getConnection(); 5+FLSk
conn.setAutoCommit(false); oWD)+5.]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7)PJ:4IqS
for(int i=0;i<CountCache.list.size();i++){ 1 ;Ju]
CountBean cb=(CountBean)CountCache.list.getFirst(); G;2[
CountCache.list.removeFirst(); ?>)yKa# U
ps.setInt(1, cb.getCountId()); /| f[us-w
ps.executeUpdate();⑴ uo 4xnzc
//ps.addBatch();⑵ ?waebuj>
} ]^!}*
//int [] counts = ps.executeBatch();⑶ T&4fBMBp,%
conn.commit(); j)Lo'&Y~=
}catch(Exception e){ ;@!;1KDy
e.printStackTrace(); VKf6|ae
} finally{ #01/(:7
try{ #ko6L3Pi
if(ps!=null) { sy.:T]ZH
ps.clearParameters(); cKpQr7]ur
ps.close(); 28+HKbgK
ps=null; @H4wHlb
} ;*`_#Rn#
}catch(SQLException e){} -R74/GBg
DBUtils.closeConnection(conn); OequU'j
} bZXlJa`'S
} ecT]p
public long getLast(){ s[Gswd
return lastExecuteTime; <)J55++
} Re\o
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public void run(){ }6@%((9E2
long now = System.currentTimeMillis(); W+/2c4$F3
if ((now - lastExecuteTime) > executeSep) { h.D^1
//System.out.print("lastExecuteTime:"+lastExecuteTime); r"[L0Cbb
//System.out.print(" now:"+now+"\n"); fU`T\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /'"R Mq
lastExecuteTime=now; n531rkK-
executeUpdate(); qu!<lW~c
} *cQz[S@F
else{ 'rh\CA/}D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); m>O2t-
} ZZwBOGVU
}
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} sOC|
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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 p Mh++H]"
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类写好了,下面是在JSP中如下调用。 _[0I^o
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<% acy"ct*I
CountBean cb=new CountBean(); 4zwif&
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5Ny0b|+p
CountCache.add(cb); 6<+8}`@B>G
out.print(CountCache.list.size()+"<br>"); X;5 S
CountControl c=new CountControl(); vS2(Q0+TZi
c.run(); rSbQ}O4V
out.print(CountCache.list.size()+"<br>"); >["Kd.ye
%>