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: rvlvk"
IJ~j(.W
CountBean.java v<t?t<|J
OIJT~Z}
/* v$D U
q+
* CountData.java x5CMP%}d
* ?%[~J
* Created on 2007年1月1日, 下午4:44 r
^\(M
{
* "X^<g{]
* To change this template, choose Tools | Options and locate the template under T-#4hY`
* the Source Creation and Management node. Right-click the template and choose `/Rqt+C
* Open. You can then make changes to the template in the Source Editor. ,/%'""`w
*/ y%X!l(gQ
$4^SWT.
package com.tot.count; %ioVNbrR7
S@Rd>4
/** 0QT:@v2R
* -|Zzs4bx
* @author ALy7D*Z]w
*/ /`l;u7RD
public class CountBean { }W'4(V;:
private String countType; ,<* I5:
int countId; n0!2-Q5U)h
/** Creates a new instance of CountData */ 71y{Dwya
public CountBean() {} l -xc*lC
public void setCountType(String countTypes){ x1?mE)n]
this.countType=countTypes; _U} vKm
} .1q}mw
public void setCountId(int countIds){ e MHz/;I
this.countId=countIds; p #{y9s4h
} 9=~ZA{0J
public String getCountType(){ ?].MnwYo
return countType; uDP:kM
} :SS \2
public int getCountId(){ OxYAM,F
return countId; M2-`p
} SAdE9L =d
} ^?Mp(o
@lF?+/=$
CountCache.java t^KQ*8clG
Ku%tM7 ad
/* $L 8>Ha}
* CountCache.java }%8ZN :
* 0cE9O9kE
* Created on 2007年1月1日, 下午5:01 0U@#&pUc
* }L)[>
* To change this template, choose Tools | Options and locate the template under GTM0Qvf?
* the Source Creation and Management node. Right-click the template and choose u\Ylo.)b
* Open. You can then make changes to the template in the Source Editor. $TmEVC^0
*/ g{Al:}u>
(^35cj{s
package com.tot.count; nj'5iiV`]
import java.util.*; K<wFr-z
/** |~e"i<G#
* 4hy-M>!D|
* @author (0H=f6N
*/ BLyV~
public class CountCache { NX,m6u
public static LinkedList list=new LinkedList(); v>#Njgo
/** Creates a new instance of CountCache */ `VKFA<T
public CountCache() {} 953qz]Q8
public static void add(CountBean cb){ vII{i
if(cb!=null){ U8Zb&6
list.add(cb); gns}%\,
} J<;io!
} &J&'J~N
} hNM8H
6qHD&bv\%C
CountControl.java y\Aa;pL)RQ
Tc/^h4xH
/* u"=]cBRWL6
* CountThread.java j*<J&/luYZ
* <7VLUk}
* Created on 2007年1月1日, 下午4:57 S(Af o`
* |E7J5ha
* To change this template, choose Tools | Options and locate the template under qC> tni%
* the Source Creation and Management node. Right-click the template and choose ZK8)FmT_<O
* Open. You can then make changes to the template in the Source Editor. U-9Aq
*/ h(HpeN%`#
!xfDWbvHV
package com.tot.count; #\w N2`" W
import tot.db.DBUtils; .Qx5,)@9
import java.sql.*; M5ZH6X@5
/** x.*^dM@V
* KsP2./N
* @author <E4(KE
*/ Tse#{
public class CountControl{ GIM/ T4!)
private static long lastExecuteTime=0;//上次更新时间 q$:7j5E
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 a#=d{/ab
/** Creates a new instance of CountThread */ Y7.+
Ma#|
public CountControl() {} `s}L3bR]
public synchronized void executeUpdate(){ iz# R)EB/g
Connection conn=null; N!(mM;1X)
PreparedStatement ps=null; o>r
P\
try{ &T,|?0>~=J
conn = DBUtils.getConnection(); ZOEe -XW
conn.setAutoCommit(false); E+lR&~mK=
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); &SE}5ddC7
for(int i=0;i<CountCache.list.size();i++){ bg i_QB#k\
CountBean cb=(CountBean)CountCache.list.getFirst(); no3yzF3Hi
CountCache.list.removeFirst(); k~8-Eu1
ps.setInt(1, cb.getCountId()); ik(Du/
ps.executeUpdate();⑴ /P*XB%y
//ps.addBatch();⑵ t2o{=!$WH
} Oj c Tu
//int [] counts = ps.executeBatch();⑶ + +}!Gfc?s
conn.commit(); $Y|OGZH8E
}catch(Exception e){ |reA`&<q
e.printStackTrace(); !FL"L
9
} finally{ ;#85 _/
try{ ojy^A
if(ps!=null) { i wgt\ux.
ps.clearParameters(); e,xL~P{|
ps.close(); z< L2W",
ps=null; #"N60T@
} $pES>>P
}catch(SQLException e){} LL#REK|lm8
DBUtils.closeConnection(conn); _ p\L,No
} [[ie
} GQtNk<?$I
public long getLast(){ i!%bz
return lastExecuteTime; uvbVb"\"Yk
} P\j\p
=
public void run(){ =y][j+WH
long now = System.currentTimeMillis(); }=/zG!+
if ((now - lastExecuteTime) > executeSep) { ,ErfTg&^
//System.out.print("lastExecuteTime:"+lastExecuteTime); zWEPwOlI1P
//System.out.print(" now:"+now+"\n"); O`@Nl
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Fa%1]R
lastExecuteTime=now; lnyb4d/
executeUpdate(); eM<N?9 s
} kkq1:\pZ]a
else{ ab2FK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ]bY|>q
} e'K~WNT
} efXnF*Z
} j;3I` :
//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 )q=F_:$
_eKO:Y[e
类写好了,下面是在JSP中如下调用。 pN[WYM?[
vha9,5_
<% xsH1)
CountBean cb=new CountBean(); M@cFcykK
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); |T|m5V'l
CountCache.add(cb); mXRkR.zu+
out.print(CountCache.list.size()+"<br>"); 9lb?%UFe
CountControl c=new CountControl(); 1,fR kQ
c.run(); r^~+<"
out.print(CountCache.list.size()+"<br>"); >5CK&6
%>