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: ~UjFL~K}
lgZ3=h
CountBean.java yhe$A<Rl=
*b?C%a9
/* ?H7*? HV
* CountData.java b
r)o Sw
* @v9PI/c
* Created on 2007年1月1日, 下午4:44 ]GYO`,
* cA"',N8!5
* To change this template, choose Tools | Options and locate the template under 2
[a#wz'
* the Source Creation and Management node. Right-click the template and choose yy4QY%
* Open. You can then make changes to the template in the Source Editor. ?7@Y=7BS4
*/ @EzSosmF
)t{oyBT
package com.tot.count; (LPMEQhI:
}cyHR1K
/** #Nxk3He]8
* Q7$ILW-S
* @author DO(-)izC
*/ CzxU
@
public class CountBean { 1TfK"\
private String countType; v?rjQ'OP
int countId; gZgb-$b
/** Creates a new instance of CountData */ *L8Pj`zR
public CountBean() {} `G\uTC pk
public void setCountType(String countTypes){ 9|dgmEd
this.countType=countTypes; .ag4i;hS8
} i 8I%}8
public void setCountId(int countIds){ ;HM&
":7
this.countId=countIds; 4EzmH)4G
} #M6@{R2_
public String getCountType(){ Y((s<]7
return countType; %y33evX/B
} goi.'8M|/b
public int getCountId(){ (,PO(
return countId; gF1qZ=<
} vpx8GiV
} `h12
{zBf *x
CountCache.java aksyr$d0V<
bL
(g$Yi
/* sT dD=>
* CountCache.java Z{`;Ys:zk
* bp2l%A;
* Created on 2007年1月1日, 下午5:01 R-J\c+C>W
* pt;E~_
* To change this template, choose Tools | Options and locate the template under VO>A+vx3M
* the Source Creation and Management node. Right-click the template and choose 8qn1?Lb
* Open. You can then make changes to the template in the Source Editor. $<2r;'?0D
*/ %\=5,9A\
6
k+FTDL
package com.tot.count; CJk$o K{Q
import java.util.*; H
r? G_L
/** .&.j?kb
* E\#hcvP
* @author 4H8vB^
*/ [o<R#f`
public class CountCache { /j./
public static LinkedList list=new LinkedList(); {gluK#Qm
/** Creates a new instance of CountCache */ Dna0M0
public CountCache() {} $"C]y$}
public static void add(CountBean cb){ 0 V*Di2
if(cb!=null){ r#*kx# "
list.add(cb); oabc=N!7r
} {bL6%._C
} JPS22i)P
} q5?g/-_0[
%TdZ_
CountControl.java MVz=:2)J2
M hNzmI&`
/* ws
Lg6
* CountThread.java U .hV1
* mJR vC%
* Created on 2007年1月1日, 下午4:57 <Bb$d@c
* V(1Ldl'a
* To change this template, choose Tools | Options and locate the template under +:?-Xd:p
* the Source Creation and Management node. Right-click the template and choose 8I$B^,N
* Open. You can then make changes to the template in the Source Editor. *W,"UL6U8y
*/ BKfcK>%g
|E0>-\6
package com.tot.count; gxpR#/(E~
import tot.db.DBUtils; jZS6f*$
import java.sql.*; K>6#MI
/** {&8-OoH ~
* esx<feP)\
* @author !p4w
8
*/ r9 'lFj
public class CountControl{ 2]5dSXD
private static long lastExecuteTime=0;//上次更新时间 ,x!P|\w.G{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Zalgg/.
/** Creates a new instance of CountThread */ Ra<mdteZT
public CountControl() {} X0J@c "%0
public synchronized void executeUpdate(){ sXOGIv
Connection conn=null; 7g_:Gv~v
PreparedStatement ps=null; ?JDZDPVJ)
try{ !YSAQi ;I
conn = DBUtils.getConnection(); aM5zYj`pW
conn.setAutoCommit(false); ~PP*k QZlJ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); T{d7,.:
for(int i=0;i<CountCache.list.size();i++){ 048BQ
CountBean cb=(CountBean)CountCache.list.getFirst(); FiJJe
CountCache.list.removeFirst(); :.f =>s]
ps.setInt(1, cb.getCountId()); pa Uh+"y>
ps.executeUpdate();⑴ F.ryeOJ
//ps.addBatch();⑵ PcC9)x
} pbKDtqSnz
//int [] counts = ps.executeBatch();⑶ lb5Y$ZC
conn.commit(); &\4AvaeA8y
}catch(Exception e){ =\`g<0
e.printStackTrace(); 0*YLFqN
} finally{ ?Q;8D@
try{ zz 7m\
if(ps!=null) { G*2bYsnhX
ps.clearParameters(); 0DhF3]
ps.close(); (o)nN8
ps=null; .]0B=w* Z
} /Z HuT=j1
}catch(SQLException e){} l;}D| 6+_W
DBUtils.closeConnection(conn); )VQ:L:1t(
} Ox.&tW%@
} [[P?T^KT
public long getLast(){ ;!DUN zl
return lastExecuteTime; E9HA8
} P\KP )bkC
public void run(){ K/79Tb-
long now = System.currentTimeMillis(); (h7 rW3
if ((now - lastExecuteTime) > executeSep) { HiCNs;t
//System.out.print("lastExecuteTime:"+lastExecuteTime); o{pQDI {R
//System.out.print(" now:"+now+"\n"); eG9tn{
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); HE(|x1C)j
lastExecuteTime=now; ZW }*]rg
executeUpdate(); &F9BaJ
} u*Z>&]W_
else{ 7'Y 3T[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); R8P7JY[h
} &G7JGar
} ?Z
{4iF
} B-ReBtN
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 zg+78
1O*5>dkX;%
类写好了,下面是在JSP中如下调用。 YpoO:
f;`pj`-k%
<% dX{|-;6vm
CountBean cb=new CountBean(); N~_GJw@
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); |8PUmax
CountCache.add(cb); )a.Y$![
out.print(CountCache.list.size()+"<br>"); \.2?951}
CountControl c=new CountControl(); t%ye:
c.run(); /9 NQ u
out.print(CountCache.list.size()+"<br>"); I8@NQ=UV0
%>