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: qbjRw!2?w
;tO (,^
CountBean.java 7+fFKZFKF
'j|;M
/* TWMD f
* CountData.java 278
6tZF,
* Zi^&x6y^
* Created on 2007年1月1日, 下午4:44 gqE{
* @l 1 piz8
* To change this template, choose Tools | Options and locate the template under c}QjKJ-c
* the Source Creation and Management node. Right-click the template and choose Vx'_fb?wap
* Open. You can then make changes to the template in the Source Editor. C+_ NG
*/ _("{fJ,A
8@ b83
package com.tot.count; 1Ypru<.)W
rQU;?[y
/** UPH:$Fk&
* n<MH\.!tM
* @author RX'(
l
*/ HA| YLj?|g
public class CountBean { y 2bZo'Z
private String countType; dI3U*:$X
int countId; dLLF#N
/** Creates a new instance of CountData */ VgOj#Z?K
public CountBean() {} ds`a6>746
public void setCountType(String countTypes){ )]'?yS"
this.countType=countTypes; E1=]m
} ^$VOC>>9
public void setCountId(int countIds){ WL<Cj_N_{H
this.countId=countIds; :WE(1!P@
} 2%QY~Ku~
public String getCountType(){ J?HYN%
return countType; 1N2s[ \q$
} : -OHD#>%
public int getCountId(){ bEbnZ<kz*
return countId; =F6J%$
} t68h$u
} bX8Bn0#a+
+`zM^'^$
CountCache.java -3A#a_fu
&{99Owqg
/* U)2\=%8
* CountCache.java jvA]EN6$;~
* HKV]Rn
* Created on 2007年1月1日, 下午5:01 .7"
f~%&oP
* (h%!Kun
* To change this template, choose Tools | Options and locate the template under X2~>Z^,
U
* the Source Creation and Management node. Right-click the template and choose :`25@<*u
* Open. You can then make changes to the template in the Source Editor. iphe0QE[#}
*/ r\Zz=~![<
l:%4@t`
package com.tot.count; ?Jio9Zr
import java.util.*; YvR MUT
/** WOiw 0
* 1jpcoJ@s
* @author 5#~u U
*/ vzG(u_,9[
public class CountCache { 6Dwj^e0
public static LinkedList list=new LinkedList(); _Uc le
/** Creates a new instance of CountCache */ Srg`Tt]
public CountCache() {}
v[\'
M
public static void add(CountBean cb){ a2/!~X9F
if(cb!=null){ g^/
list.add(cb); s${ew.eW
} s0WI93+z
}
G<U MZg
} 6x7pqHM
1)U%p
CountControl.java rfku]A$
?*){%eE
/* Q0s!]Dk
* CountThread.java N;Wm{~Zhb
* Ou>L|#=!
* Created on 2007年1月1日, 下午4:57 0P_qtS
* ?VmEbl
* To change this template, choose Tools | Options and locate the template under Yjx*hv&?
* the Source Creation and Management node. Right-click the template and choose g)nsP
* Open. You can then make changes to the template in the Source Editor. FMhSHa/B
*/ |]y]K%
v!JQ;OX
package com.tot.count; bdEc?
import tot.db.DBUtils; 8bd&XieE
import java.sql.*; [9Q}e;T
/** v2][gn+58
* Wz',>&a
* @author 3=SIIMp7=
*/ )*Xd
public class CountControl{ $)8b)Tb
private static long lastExecuteTime=0;//上次更新时间 gTa6%GM>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,'N8Ivt
/** Creates a new instance of CountThread */ F l@%?
public CountControl() {} )%FRBO]
public synchronized void executeUpdate(){ C7:;<<"P
Connection conn=null; _Z'[-rcXWh
PreparedStatement ps=null; [<CIh46S.
try{ os9X)G
conn = DBUtils.getConnection(); 8K$q6V%#
conn.setAutoCommit(false); U 51C /A
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Q4i@y6z
for(int i=0;i<CountCache.list.size();i++){ ;w--fqxVl
CountBean cb=(CountBean)CountCache.list.getFirst(); '[V}]Z>-
CountCache.list.removeFirst(); x=s=~cu4,
ps.setInt(1, cb.getCountId()); +X#JCLD
ps.executeUpdate();⑴ Kw_> X&GcJ
//ps.addBatch();⑵ [Vzp D 4
} FtHR.S=u
//int [] counts = ps.executeBatch();⑶ WCJ$S\#
conn.commit(); QU{|S.\
}catch(Exception e){ K)=<hL
e.printStackTrace(); M*6}# ST
} finally{ F-0 |&0
try{ `IN/1=]5
if(ps!=null) { jG~zpZh
ps.clearParameters(); Y_S>S(0
ps.close(); t|XQFb@}
ps=null; fR]%:'2k
} (nL''#Ka
}catch(SQLException e){} @'XxMO[Z!<
DBUtils.closeConnection(conn); *>"k/XUn$
} a8$gXX-2
} ] /w:5o#
public long getLast(){ w=Cqv~
return lastExecuteTime; `q":i>FP2
} 9b88):[qO
public void run(){ BTi:Bcv k
long now = System.currentTimeMillis(); +OM`c7M:
if ((now - lastExecuteTime) > executeSep) { EdgcdSb7
//System.out.print("lastExecuteTime:"+lastExecuteTime); lyZ[tP S
//System.out.print(" now:"+now+"\n"); $w%n\t>B
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 57PoJ+
lastExecuteTime=now; [R-&5 G!x
executeUpdate(); ~m@v ~=
} dB`3"aSN7
else{ 5BWO7F0v"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); SI-G7e)3;>
} PH$fDbC8
} $d:>(_p=A
} DSb/+8KT
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 JrZ"AId2
6<E4?<O%
类写好了,下面是在JSP中如下调用。 --X1oC52A
#I]5)XT
<% ^
hoz<Ns
CountBean cb=new CountBean(); AC'$~4
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {-FS+D`
CountCache.add(cb); ^dc~hD
out.print(CountCache.list.size()+"<br>"); !w+A3Z>V
CountControl c=new CountControl(); ~x}/>-d
c.run(); >'\cNM~nf
out.print(CountCache.list.size()+"<br>"); mI;#Zq_j
%>