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: aNNRw(0/
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CountBean.java ^FBu|eAkE
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/* c00rq ~<K
* CountData.java W[
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* ,|>>z#Rr(n
* Created on 2007年1月1日, 下午4:44 JtxVF!v
* B8n[ E
* To change this template, choose Tools | Options and locate the template under N5ZOpRH{
* the Source Creation and Management node. Right-click the template and choose }1~9i'o%Z
* Open. You can then make changes to the template in the Source Editor. QV:> x#=V
*/ SE@TY32T
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package com.tot.count; 3o/f, }_
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/** K[0z$T\
* Ql l{;A
* @author 5(hv|t/a
*/ v1X[/\;U
public class CountBean { T4"D&~3
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private String countType; -PGxG 8S
int countId; S-Vj$asv!
/** Creates a new instance of CountData */ jgG9?w)|u
public CountBean() {} 8F`8=L NO
public void setCountType(String countTypes){ GiEt;8
this.countType=countTypes; As,e.V5!
} Ut;4`>T
public void setCountId(int countIds){ 2;s[ m3
this.countId=countIds; JoiGuZd>
} cSV&p|
public String getCountType(){ 6o\uv
return countType; II.:k.D`
} q oi21mCn
public int getCountId(){ X9]} UX
return countId; t&q~ya/C
} w4\
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} ~n%Lo3RiP
) 5$?e
CountCache.java LD5`9-
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/* \R]2YY`EP
* CountCache.java REK):(i7P
* :DNI\TmhJ
* Created on 2007年1月1日, 下午5:01 RJerx:]
* hCr,6nc C
* To change this template, choose Tools | Options and locate the template under PQSmBTs.
* the Source Creation and Management node. Right-click the template and choose KA?%1s(kJ
* Open. You can then make changes to the template in the Source Editor. sCrP+K0D
*/ at@tS>Dv
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package com.tot.count; Uuu2wz3O0
import java.util.*; bo\Ah/.
/** Q*PcO \Y!y
* w?|qKO
* @author ;
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*/ SE^l`.U@
public class CountCache { :?g+\:`/0j
public static LinkedList list=new LinkedList(); ,@?9H ~\
/** Creates a new instance of CountCache */ rXD:^wUSc
public CountCache() {} ,h'Q
public static void add(CountBean cb){ 9wldd*r
if(cb!=null){ e"eIQI|N
list.add(cb); :}Yk0*
} Hv,ll1@h
} {2P18&=
} qmFbq<&
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CountControl.java Z.Z;p/4F
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/* MQN~I^v3
* CountThread.java
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* \X%FM"r
* Created on 2007年1月1日, 下午4:57 ``VE<:2+
* YARL/V
* To change this template, choose Tools | Options and locate the template under t^YtP3`?b
* the Source Creation and Management node. Right-click the template and choose jmaw-Rx
* Open. You can then make changes to the template in the Source Editor. Jk&!(YK&
*/ #\Rxqh7
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package com.tot.count; b5^>QzgD
import tot.db.DBUtils; {x,)OgK!{
import java.sql.*; 3Q=\W<Wu
/** Um4zI>
* uZrp ^
* @author .qZz'Eq[
*/ -#T%*
public class CountControl{ d!R+-Fp
private static long lastExecuteTime=0;//上次更新时间 }Cw,m0KV/
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 f*Q9u >1p
/** Creates a new instance of CountThread */ i^.eX
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public CountControl() {} $Uy+]9
public synchronized void executeUpdate(){ ^?""'1iuQx
Connection conn=null; 5yoi;$~}_0
PreparedStatement ps=null; M NwY
try{ f7Nmvla[q
conn = DBUtils.getConnection(); Ul]7IUzsu
conn.setAutoCommit(false); e8xq`:4Y
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <%uEWb)
for(int i=0;i<CountCache.list.size();i++){ ?VE'!DW
CountBean cb=(CountBean)CountCache.list.getFirst(); o(Z~J}l({
CountCache.list.removeFirst(); AkS16A
ps.setInt(1, cb.getCountId()); b:Zh|-
ps.executeUpdate();⑴
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//ps.addBatch();⑵ 1aRTvaGo
} bs)wxU`Q*
//int [] counts = ps.executeBatch();⑶ \l/}` w
conn.commit(); *|\bS "
}catch(Exception e){ q&v~9~^}d
e.printStackTrace(); !10/M
} finally{ rmkBp_i{|
try{ {X(nn.GpC
if(ps!=null) { v8y Cf7+"
ps.clearParameters(); FD
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ps.close(); g&2g>]
ps=null; ?|W3RK;
} #9]2Uixq[
}catch(SQLException e){} zc)nDyn
DBUtils.closeConnection(conn); _p0Yhju?
} Evm3Sm!S
} ~s HdOMw
public long getLast(){ b=MW;]F
return lastExecuteTime; EDgtn)1
} {*O+vtir%
public void run(){ Bv@p9 ]
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long now = System.currentTimeMillis(); <H60rON
if ((now - lastExecuteTime) > executeSep) { +CBN[/Z^i
//System.out.print("lastExecuteTime:"+lastExecuteTime); d>)=|
//System.out.print(" now:"+now+"\n"); ZXYyG`3+
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); T=42]h
lastExecuteTime=now; SQf[1}$ .
executeUpdate(); F=e;[uK\
} -Z,r\9d
else{ `Ze$Bd\
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); JX5/PCO
} 0$Rn|yqf%
} ~\NQkaBkY
} IW<rmP=R&
//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 1K@ieVc
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类写好了,下面是在JSP中如下调用。 3<$Ek3X
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<% w@,p`
CountBean cb=new CountBean(); ?B ,<gen
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); #!O)-dyF
CountCache.add(cb); Jaw1bUP!oK
out.print(CountCache.list.size()+"<br>"); !|4]V}JQ
CountControl c=new CountControl(); 06AgY0\
c.run(); gw,K*ph}q
out.print(CountCache.list.size()+"<br>"); >^g2Tg:
%>