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/
_bB:1l?V
CountBean.java WVDkCo@
E0QrByr_
/* )P
* CountData.java Z{"/Ae5]
* =\]5C
* Created on 2007年1月1日, 下午4:44 A*tG[)
* %9ef[,WT
* To change this template, choose Tools | Options and locate the template under 0LX;Vvo
* the Source Creation and Management node. Right-click the template and choose ^hPREbD+f
* Open. You can then make changes to the template in the Source Editor. "&(.Z (
*/ S*,DX~vig
BUR96YN.
package com.tot.count; ?B>
{rj
)U0`?kD
/** TtA6N8G
* \FOoIY!.x
* @author K(P24Z\#
*/ fWo}gH~
public class CountBean { 297X).
private String countType; Ax &Z=
int countId; H4DM,.04
/** Creates a new instance of CountData */ Q?df5{6
public CountBean() {} E`68Z/%
public void setCountType(String countTypes){ Ce 3{KGBw
this.countType=countTypes; j G8W|\8
} ()K,~
public void setCountId(int countIds){ 1#LXy%^tO
this.countId=countIds; ._2#89V
} 1&%6sZN
public String getCountType(){ "b)Y 5[nW
return countType; vsc)EM ]
} aH7i$U&
public int getCountId(){ nn'a`N
return countId; !,8jB(
} }pk)\^/w/
} z|,YO6(L
LLp/ SWe
CountCache.java /[
_aw&W}Z
^2C)Wk$
/* -1'O
* CountCache.java xZ'-G6O
"~
* y(gL.08<
* Created on 2007年1月1日, 下午5:01 fyYHwG
* \@IEqm6
* To change this template, choose Tools | Options and locate the template under XL9smFq
* the Source Creation and Management node. Right-click the template and choose @Z9X^Y+u^h
* Open. You can then make changes to the template in the Source Editor. qPle=6U[IL
*/ MR$R#
G i1Jl"
package com.tot.count; dw'&Av'
|E
import java.util.*; (C{l4
/** .!#0eAT
* KVQ^-^
* @author }4'5R
*/ 8%C7!l q
public class CountCache { S#km`N`
public static LinkedList list=new LinkedList(); @\{L%y%a0
/** Creates a new instance of CountCache */ ybsQ[9_36
public CountCache() {} C(N' +VV_
public static void add(CountBean cb){ aU&p7y4C@
if(cb!=null){ 3$<u3Zi6
list.add(cb);
UZJ^e$N
} 7X+SK&PX
} SZVNu*G!H
} K&T[F!
wm1`<r^M.
CountControl.java *`D}voU
pxf(C<y6_
/* Bi}uL)~rD
* CountThread.java "cJ))v-'
* ;U+4!N
* Created on 2007年1月1日, 下午4:57 QT\||0V~p
* Ag[Zs%X
* To change this template, choose Tools | Options and locate the template under Kkfz a
* the Source Creation and Management node. Right-click the template and choose 2HA-q),6
* Open. You can then make changes to the template in the Source Editor. HpbSf1VvAf
*/ 2bu,_<K.
l', +l{\Z
package com.tot.count; <V[Qs3uo(
import tot.db.DBUtils; 1Ce7\A
import java.sql.*; Z5x&P_.x[
/** b'x26wT?
* HL8onNq
* @author QMO.Bnek
*/ =@e3I)D#?i
public class CountControl{ qr$h51C&
private static long lastExecuteTime=0;//上次更新时间 Os)jfKn2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 2A>s
a3\
/** Creates a new instance of CountThread */ SSr#MIS?
public CountControl() {} &A/k{(.XP
public synchronized void executeUpdate(){ * A<vrkHz
Connection conn=null; \zCwD0Z
PreparedStatement ps=null; _E\Cm
try{ H$D),s
gv
conn = DBUtils.getConnection(); <b
JF&,
conn.setAutoCommit(false); :mYVHLmea
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Mz59ac
for(int i=0;i<CountCache.list.size();i++){ azK7kM~
CountBean cb=(CountBean)CountCache.list.getFirst(); ?nf !sJ'm
CountCache.list.removeFirst(); =6.4
ps.setInt(1, cb.getCountId()); JxP&znng
ps.executeUpdate();⑴ dG8_3T}i
//ps.addBatch();⑵ ww? AGd
} ,J*C'#sW
//int [] counts = ps.executeBatch();⑶ l&
A8P
conn.commit(); nYFM^56>_
}catch(Exception e){ `jHbA #sO
e.printStackTrace(); \ 8v^ hb
} finally{ $U/|+*
try{ [SKN}:D
if(ps!=null) { 0Dt-!Q7
ps.clearParameters(); QsemN7B"<
ps.close(); *F:)S"3_~e
ps=null; u~pBMg
,
} =Ch^;Wyt
}catch(SQLException e){} 8-||Nh
DBUtils.closeConnection(conn); uM"_3je{W2
} 0jJ:WPR
} &~Hx!]uc
public long getLast(){ pie8 3Wy>
return lastExecuteTime; !"d"3coQ?
} SH1S_EQ<
public void run(){ @ajt
D-_2
long now = System.currentTimeMillis(); IGnP#@`5]
if ((now - lastExecuteTime) > executeSep) { 5 eLm
//System.out.print("lastExecuteTime:"+lastExecuteTime); SSQB1c
//System.out.print(" now:"+now+"\n"); luWr.<1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); urbSprdF
lastExecuteTime=now; TCWt3\
executeUpdate(); >%\&tS'
} JGHQzC
else{ dZWO6k9[H
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Q8H+=L:
} /R(]hmW
} xYd]|y
} btR~LJb
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 pw.K,?kYr
Ga]\~31NE
类写好了,下面是在JSP中如下调用。 f2LiCe.?
:<P3fW
<% 14pyHMOR
CountBean cb=new CountBean(); vojXo|c
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); e"(SlR
CountCache.add(cb); c5em*qCw$
out.print(CountCache.list.size()+"<br>"); |Vo{ {)
CountControl c=new CountControl(); VPr`[XPXb
c.run(); 11iV{ h
out.print(CountCache.list.size()+"<br>"); Y*QoD9<T?;
%>