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: 9|#h )*
pX*mX]
CountBean.java DJ<e=F!
kXG+zsT
/* ^,`Lt *
* CountData.java OU{PVF={
* 6^
KDc
* Created on 2007年1月1日, 下午4:44 Xi0/Wb h\
* XK&#K? M
* To change this template, choose Tools | Options and locate the template under >EMCG.**
* the Source Creation and Management node. Right-click the template and choose t?c*(?Xa
* Open. You can then make changes to the template in the Source Editor. eyo )Su
*/ t+?\4+!<
o-x_[I|@
package com.tot.count; B,gQeW&
~I'Z=Wo
/** xds"n5
* +{#BQbx6
* @author Q'\jm=k
*/ Rx'7tff%I
public class CountBean { {fX4
private String countType; [s7I.rdGzz
int countId; zu;Yw=cM)
/** Creates a new instance of CountData */ C g&1
public CountBean() {} wOa_"
public void setCountType(String countTypes){ B:^U~s R
this.countType=countTypes; q].C>R*ux8
} Je?V']lm
public void setCountId(int countIds){ uAJ_`o[
this.countId=countIds;
2QBtwlQ?[
} +ckj]yA;
public String getCountType(){ g@j:TQM_0
return countType; $~`(!pa:
} Mz"kaO
public int getCountId(){ esLY1c%"/
return countId; m\~[^H~g
} xK_$^c.
} ^Jkj/n'
-D
V;{8U4
CountCache.java |kVxrq
m+vwp\0
/* cb
UVeh7Q
* CountCache.java tL
IE^
* :;|x'[JoE?
* Created on 2007年1月1日, 下午5:01 a~{Stv
* C6,Bqlio
* To change this template, choose Tools | Options and locate the template under c=Z#7?k=Uz
* the Source Creation and Management node. Right-click the template and choose _VM J q9.
* Open. You can then make changes to the template in the Source Editor. 2.:b
*/ f<zh-Gq
B!-W765Y
package com.tot.count; |L+GM"hg
import java.util.*; 54 8@._-S
/** i:zA(
* *&AK.n_
* @author 1w5p*U0 ;
*/ h{TnvI/"
public class CountCache { ({i|
public static LinkedList list=new LinkedList(); I5D\Z
/** Creates a new instance of CountCache */ 0\gE^=o[
public CountCache() {} w$t2Hd
public static void add(CountBean cb){ }Rf }
iG
if(cb!=null){ $23R%8j
list.add(cb); Y<M}'t
} @B[=`9KF[
} m1`ln5(R
} "/\:Fdc^
:Z+(H +lyZ
CountControl.java 5
WAsEP
Dic(G[
/* o-(jSaH :;
* CountThread.java xr?r3Y~^e
* R'80 {
* Created on 2007年1月1日, 下午4:57 bRIb'%=+GA
* W>,b1_k
c
* To change this template, choose Tools | Options and locate the template under }u|0
* the Source Creation and Management node. Right-click the template and choose 1-b,X]i
* Open. You can then make changes to the template in the Source Editor. I]$kVa1iN
*/ Ep'C FNbtW
x t-;7
package com.tot.count; y24 0 +;a
import tot.db.DBUtils; fh 2Pn!h+
import java.sql.*; w}2yi#E[
/** dvxH:,
* /evh .S
* @author kPxrI=
*/ {fS/ZG"5<t
public class CountControl{ Z> &PM06
private static long lastExecuteTime=0;//上次更新时间 QVFa<>8/md
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 JEAqSZak#
/** Creates a new instance of CountThread */ Z2LG/R
public CountControl() {} {!EbGIh
public synchronized void executeUpdate(){ \K)q$E<!
Connection conn=null; v/m6(z
PreparedStatement ps=null; ,Wdyg8&.
try{ nH_A`m3%/
conn = DBUtils.getConnection(); +q2l,{|?
conn.setAutoCommit(false); (d~'H{q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2Nj0 Hqjq
for(int i=0;i<CountCache.list.size();i++){ ao,LP,_
CountBean cb=(CountBean)CountCache.list.getFirst(); *X)OdU
CountCache.list.removeFirst(); B)c.`cfr*\
ps.setInt(1, cb.getCountId()); #6YNgJNk
ps.executeUpdate();⑴ G[wa,j^hu
//ps.addBatch();⑵ !WIL|\jbh
} ]IoS-)$Z/
//int [] counts = ps.executeBatch();⑶ .lE"N1
conn.commit(); QP qa\87
}catch(Exception e){ Y${ $7+@
e.printStackTrace(); *F9uv)[kz
} finally{ [`
i;gx[^
try{ [}VEDx
if(ps!=null) { )@sz\yI%U
ps.clearParameters(); -MU^%t;-
ps.close(); `rM-b'D
ps=null; vu*08<M~i|
} SWmdU]
}catch(SQLException e){} `@:^(sMo
DBUtils.closeConnection(conn); Aimgfxag
} ukPV nk
} '7xY,IY
public long getLast(){ a1j6-p
return lastExecuteTime; Jl4zj>8~
} pQqZ4L6v
public void run(){ '8W }|aF
long now = System.currentTimeMillis(); Karyipn}
if ((now - lastExecuteTime) > executeSep) { v0HFW%YJ^J
//System.out.print("lastExecuteTime:"+lastExecuteTime); AAs&wYp8Yh
//System.out.print(" now:"+now+"\n"); #q=?Zu^Da
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); f:=?"MX7
lastExecuteTime=now; . Bv;Zv
executeUpdate(); a{{([uZ
} *W0`+#Dcv
else{ l~\'Z2op
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); W"~G]a+
} [g%oo3`A
} /FQumqbnt
} ~Ipl'cE
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 V862(y
6 .*=1P*?
类写好了,下面是在JSP中如下调用。 ZOU$do>O
jaDZPX-yS
<% PvO>}(=
CountBean cb=new CountBean(); 0t<TZa]V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x2tx{Z
CountCache.add(cb); V-)q&cbW]q
out.print(CountCache.list.size()+"<br>"); iHR?]]RF
CountControl c=new CountControl(); ~s
!+9\Fi
c.run(); Ldig/:
out.print(CountCache.list.size()+"<br>"); *VD-c
%>