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: *Sf-;U
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CountBean.java (5Tvsw`
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/* +1Ph<zq"
* CountData.java Lx U={Y0
* 5[9bWB{
* Created on 2007年1月1日, 下午4:44 X#UMIlU
* wj|x:YZ*
* To change this template, choose Tools | Options and locate the template under aSYs_?&.
* the Source Creation and Management node. Right-click the template and choose zMK](o1Vj
* Open. You can then make changes to the template in the Source Editor. &MgeYpd
*/ !sA_?2$
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package com.tot.count; Zx?b<"k
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/** kDYN>``biP
* W;Jx<-#1
* @author `wTlyS3[
*/ w[Ep*-yeI
public class CountBean { npu6E;'l*
private String countType; =]Hs|{
int countId; }98>5%Uv
/** Creates a new instance of CountData */ VnJMmMM
public CountBean() {} "x&C5l}n
public void setCountType(String countTypes){ 2vKx]w
this.countType=countTypes; >1irSUj"~
} A~{f/%8D
public void setCountId(int countIds){ bT!($?GNdg
this.countId=countIds; snp v z1iS
} 9f}XRz
public String getCountType(){ )06iV
return countType; "n\%_'R\hH
} :PnSQjV:
public int getCountId(){ 8C.!V =@\
return countId; I]J*BD#n.
} /=#~
} ;+I4&VieK
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}*
CountCache.java Lg`Jp&Kg
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/* cf[vf!vi
* CountCache.java r<L#q)]
* 3@O0^v-
* Created on 2007年1月1日, 下午5:01 ?Zyok]s
* gw3NS8
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* To change this template, choose Tools | Options and locate the template under JK~ m(oQ
* the Source Creation and Management node. Right-click the template and choose F}rPY:
* Open. You can then make changes to the template in the Source Editor. c! H 9yk
*/ T"E( F
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package com.tot.count; ^,2c-
import java.util.*; ,i++fOnQ
/** 2N6=8Xy5K
* /'>;JF
* @author !Zw f
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*/ l@d
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public class CountCache { X#+`e+Df
public static LinkedList list=new LinkedList(); h[ 6hM^n
/** Creates a new instance of CountCache */ H^CilwD158
public CountCache() {} [7"}=9
public static void add(CountBean cb){ Gbd?%{Xc-
if(cb!=null){ 3BMS_,P
list.add(cb); VVrwOoCN
} e.6Dl_
} Q59/ex
} Bx X$5u
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CountControl.java c%YDt`
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/* !J.rM5K
* CountThread.java d0C8*ifFO
* Y%vP#>h
* Created on 2007年1月1日, 下午4:57 ixOw=!@
* WhUa^
* To change this template, choose Tools | Options and locate the template under "jU
* the Source Creation and Management node. Right-click the template and choose bBE^^9G=Z
* Open. You can then make changes to the template in the Source Editor. =
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*/ D$_8rHc\A
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package com.tot.count; ehc<|O9tY
import tot.db.DBUtils; @&/\r
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import java.sql.*; ?2~U2Ir]:
/** ] EyeBF)$
* NFoZ4R1gy
* @author (4)3W^/kk?
*/ $ WFhBak8
public class CountControl{ (
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private static long lastExecuteTime=0;//上次更新时间 !5;t#4=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I>m;G
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/** Creates a new instance of CountThread */ L+Nsi~YVq
public CountControl() {} qU6BA\ZL
public synchronized void executeUpdate(){ O~Uw&Bq
Connection conn=null; 1XnBK$`
PreparedStatement ps=null; nJ# XVlHc
try{ k`IrZHMw
conn = DBUtils.getConnection(); E2yz=7sv5
conn.setAutoCommit(false); oBUh]sR{.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &8Wlps`
for(int i=0;i<CountCache.list.size();i++){ ]b\WaS8I
CountBean cb=(CountBean)CountCache.list.getFirst();
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CountCache.list.removeFirst(); CB@B.)E
ps.setInt(1, cb.getCountId()); m0iV m|
ps.executeUpdate();⑴ x[m'FsR4
//ps.addBatch();⑵ F>Mr<k=@;
} U~g@TfU;
//int [] counts = ps.executeBatch();⑶ rAatJc"0
conn.commit(); QBj Y&(vY
}catch(Exception e){ ;^.9#B,<
e.printStackTrace(); chwh0J;
} finally{ vadM1c*z
try{ 0O['w<_
if(ps!=null) { j[T%'%
ps.clearParameters(); er\:U0fr#@
ps.close(); V9$-twhu
ps=null; :A$wX$H01
} >#i $Tw
}catch(SQLException e){} # 8qyg<F
DBUtils.closeConnection(conn); .%hQJ{vf-^
} wR1K8b".DC
} wG6FS
public long getLast(){ k*9%8yi_ U
return lastExecuteTime; {1 HB!@%,(
} rH^/8|}&s
public void run(){ "11j$E9#\n
long now = System.currentTimeMillis(); }moz9a
if ((now - lastExecuteTime) > executeSep) { .??rqaZ=
//System.out.print("lastExecuteTime:"+lastExecuteTime); 3V!x?H$
//System.out.print(" now:"+now+"\n"); >huq t|S*9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); M7pvxChA
lastExecuteTime=now; s_` V*`n&
executeUpdate(); ^*zW"s
} 0JOju$Bl,
else{ _9qEZV
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); i-Ljff
} W.GN0(uG
} <VgE39 [
} .hnF]_QQ
//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 .kzms
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类写好了,下面是在JSP中如下调用。 a:xgjUt&5
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<% JbVi1?c
CountBean cb=new CountBean(); 4jD\]Q="1
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); %1@.7uTN
CountCache.add(cb); 0<"tl0p_
out.print(CountCache.list.size()+"<br>"); :=B[yD!
CountControl c=new CountControl(); z+2u-jG
c.run(); =1&}t%<X
out.print(CountCache.list.size()+"<br>"); OUKj@~T
%>