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: 4Mi~eL%D
(
vBAds
CountBean.java G\&4_MS
hX(:xc
/* :$j6
* CountData.java #` )zD"CO
* W-zD1q~0?
* Created on 2007年1月1日, 下午4:44 _P.+[RS@
* p*E_Po
* To change this template, choose Tools | Options and locate the template under ) D:M_T2
* the Source Creation and Management node. Right-click the template and choose (5rH72g(
* Open. You can then make changes to the template in the Source Editor. 4tU3+e5h
*/ 2i`N26On
H5uWI
package com.tot.count; 6O8'T`F[
y)o!F^
/** I)I,{xT4
* i&\N_PUm[
* @author 5fuOl-M0W
*/ DJP)V8]!B
public class CountBean { 6T0[
~@g5
private String countType; 9MA/nybI
int countId; v`evuJ\3
/** Creates a new instance of CountData */ YqwDvJWX
public CountBean() {} gE'b.04Y9i
public void setCountType(String countTypes){ .w2X24Mmb
this.countType=countTypes; is?H1V~8`$
} k ]C+/
public void setCountId(int countIds){ V}(snG,
this.countId=countIds; pH5"g"e1
} vk:@rOpl
public String getCountType(){ rCqcl
return countType; M0g!"0?
} ~E&drl\
public int getCountId(){ Wo&10S w
return countId; f@&C
\
} g-j`Ex%
} hyv*+FV;
X+"8yZz3?
CountCache.java 94Mh/A9k
_UKH1qUd4
/* 1~NXCIdF
* CountCache.java ) '"@L7U
* WzYy<
* Created on 2007年1月1日, 下午5:01 !~PLW] Z4
* 1^rODfY 0
* To change this template, choose Tools | Options and locate the template under .PBma/w
W
* the Source Creation and Management node. Right-click the template and choose pv1J6
* Open. You can then make changes to the template in the Source Editor. xo/[,rR
*/ qV0C2jZ2
1"{3v@yi
package com.tot.count; e.9oB<Etp
import java.util.*; m@ b~
/** EdxTaR
* zS*GYE(l^
* @author (wLzkV/6
*/ }<`Mn34@
public class CountCache { 0Pw?@uV
public static LinkedList list=new LinkedList(); =+ `I%>wc
/** Creates a new instance of CountCache */ {<%zcNKl^L
public CountCache() {} E8#r<=(m
public static void add(CountBean cb){ fdP[{.$?(
if(cb!=null){ YOo?.[}@
list.add(cb); !Ziq^o.
} 'V=w?G
5
} 2}:scag
} pJ[7m
(5Q,d [B
CountControl.java |mvy@hm
Q)x`'[3"7W
/* ^pA|ubZ
* CountThread.java TUzpln
* vy\;#X!
* Created on 2007年1月1日, 下午4:57 -ZqN~5>j)
* *fVs|
* To change this template, choose Tools | Options and locate the template under ~yz7/?A)TS
* the Source Creation and Management node. Right-click the template and choose PW)XDo7
* Open. You can then make changes to the template in the Source Editor. vhiP8DQ
*/ aR30wxW&)
f;M7y:A8q,
package com.tot.count; qYLOq`<f
import tot.db.DBUtils; 44_7gOZ
import java.sql.*; bj^YB,iSM
/** zOkU R9
* tj@IrwC^e"
* @author hp?hb-4l
*/ H ^P uC (
public class CountControl{ +FiM?,G
private static long lastExecuteTime=0;//上次更新时间 /N(L52mz
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 diN5*CF'~
/** Creates a new instance of CountThread */ _
h\wH;
public CountControl() {} %9hzz5#
public synchronized void executeUpdate(){ J2VhheL`J
Connection conn=null; {'P7D4w
PreparedStatement ps=null; H: q(T
>/w
try{ dE9xan
conn = DBUtils.getConnection(); N9IBw',
conn.setAutoCommit(false); Bgs3sM9
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }I_/>58
for(int i=0;i<CountCache.list.size();i++){ `ZL~k
CountBean cb=(CountBean)CountCache.list.getFirst(); m'H%O-h\
CountCache.list.removeFirst(); v7"' ^sZ?
ps.setInt(1, cb.getCountId()); qXO@FW]
ps.executeUpdate();⑴ @WVpDhG
//ps.addBatch();⑵ ImQ?<g8$
} `Cy-*$$
//int [] counts = ps.executeBatch();⑶ Enr8"+.(
conn.commit(); vB >7W
}catch(Exception e){ i_8q!CL@{
e.printStackTrace(); A9^t$Ii
} finally{ bQc-ryC+.
try{ yZFm<_9>
if(ps!=null) { [U[saR\
ps.clearParameters(); #xZ7%
ps.close(); 'ms&ty*T
ps=null; Dlhb'*@
} j]i:~9xKW
}catch(SQLException e){} tEP~`$9
DBUtils.closeConnection(conn); ;QbMVY
} h; 105$E1
} bp Q/#\Z
public long getLast(){ V~p/P
return lastExecuteTime; ZnDI
J&S
} _r0[ z
public void run(){ o!6gl]U'y9
long now = System.currentTimeMillis(); @MMk=/WDw
if ((now - lastExecuteTime) > executeSep) { DEEQ/B{
//System.out.print("lastExecuteTime:"+lastExecuteTime); p<IMWe'tP
//System.out.print(" now:"+now+"\n"); Om`VQ?
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); S(xlN7=
lastExecuteTime=now; +$R4'{9q
executeUpdate(); t.Hte/,k
} {w*5uI%%e
else{ R/5aIh
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /*=1hF
} gB1w,96J
} H(bR@Qok
} ab4(?-'-
//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 %:rct
4L}i`)CmB
类写好了,下面是在JSP中如下调用。 1j7^2Y|UT`
7u/_3x1
<% 5*QNE!
CountBean cb=new CountBean(); w yi n
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); _(=[d
CountCache.add(cb); w_o|k&~,
out.print(CountCache.list.size()+"<br>"); M_@%*y\o
CountControl c=new CountControl(); --*Jv"/0
c.run(); t,|`#6 Ft
out.print(CountCache.list.size()+"<br>"); y7J2:/@[x
%>