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: q4k)E
L"i
B'=
CountBean.java u5f+%!p
62BJ;/ ]
/* }OeEv@^
* CountData.java dYg}qad5:
* @17hB h
* Created on 2007年1月1日, 下午4:44 q2I;Ly\3o
* )P^5L<q>|
* To change this template, choose Tools | Options and locate the template under (8!#<$
* the Source Creation and Management node. Right-click the template and choose iL-I#"qT,
* Open. You can then make changes to the template in the Source Editor. e JMD8#
*/ E)Z$7;N0x
~&/|J)}
package com.tot.count; 26fm}QV
ZCQ7xQD
/** CI+dIv>
* w8t,?dY
* @author LzEAA{
*/ v-85`h
public class CountBean { ILUA'T=B0
private String countType; dqMR<Nl&
int countId; q8:Z.<%8
/** Creates a new instance of CountData */ 9T47U; _)
public CountBean() {} 4#5w^
public void setCountType(String countTypes){ n9;+RhxA
this.countType=countTypes; UarU.~Uqi
} ^n@.
public void setCountId(int countIds){ .+G),P)
this.countId=countIds; #vy:aq<bjE
} "y>\
mC
public String getCountType(){ 5Wj+ey^^w
return countType; JM{S49Lx
} *G^n<p$"
public int getCountId(){ #@,39!;,:O
return countId; 8Ek<J+&|I
} #e.2m5T
} 6 ^X$;
;Ef:mr"Nu
CountCache.java 2,nKbE9*
BoB2q(
/* D[)")xiG
* CountCache.java &*
4uji
* &XosDt
* Created on 2007年1月1日, 下午5:01 A>6b
6
* pti`q)
* To change this template, choose Tools | Options and locate the template under 9i)E<.6
* the Source Creation and Management node. Right-click the template and choose LxkToO{
* Open. You can then make changes to the template in the Source Editor. XD`QU m
*/ 4BG6C'`%
L<>;E
package com.tot.count; tb7Wr1$<
import java.util.*; #Zpp*S55
/** 8<$6ufvOv
* j380=?7
* @author SGW2'
*/ {&G7 Xa
public class CountCache { w,NK]<dU@
public static LinkedList list=new LinkedList(); /"?y @;Y~
/** Creates a new instance of CountCache */ T0W B
public CountCache() {} |U?5%
L
public static void add(CountBean cb){ yhe$A<Rl=
if(cb!=null){ .~V0>r~my
list.add(cb); w:Fi
2aJ
} 8uoFV=bj\
} b
r)o Sw
} @v9PI/c
C
#ng`7 q
CountControl.java S .rT5A[
kZ+nL)YQ#
/* : j&M&+
* CountThread.java @EzSosmF
* (veGztt
* Created on 2007年1月1日, 下午4:57 2Z6#3~
* 1)u
3
* To change this template, choose Tools | Options and locate the template under Qi|jL*mj&
* the Source Creation and Management node. Right-click the template and choose CzxU
@
* Open. You can then make changes to the template in the Source Editor.
ykSn=0
*/ gZgb-$b
^_JD
7-g
package com.tot.count; k
oo`JHC
import tot.db.DBUtils; PYqx&om
import java.sql.*; )J8dm'wH92
/** < vU<:S
* o|8
5<~`
* @author s)"C~w^
*/ D%umL/[]
public class CountControl{ rX6"w31
private static long lastExecuteTime=0;//上次更新时间 ^~(vP:
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 K1Nhz'^=D
/** Creates a new instance of CountThread */ .]%PnJM9K
public CountControl() {} qIK"@i[
uq
public synchronized void executeUpdate(){ cD^n}'ej
Connection conn=null; Rd;k> e
PreparedStatement ps=null; R8UtX9'*sa
try{ oK@!yYv
conn = DBUtils.getConnection(); S =q.Y
conn.setAutoCommit(false); 3 q
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [AQ6ads)
for(int i=0;i<CountCache.list.size();i++){ XF(I$Mxl6
CountBean cb=(CountBean)CountCache.list.getFirst(); 0F sz
CountCache.list.removeFirst(); aQwc Py|1R
ps.setInt(1, cb.getCountId()); bC?uyo"
ps.executeUpdate();⑴ 8qn1?Lb
//ps.addBatch();⑵ $<2r;'?0D
} %\=5,9A\
//int [] counts = ps.executeBatch();⑶ 8Cz_LyL
conn.commit(); QRXsLdf$$
}catch(Exception e){ ^ng#J\
e.printStackTrace(); CfQOG7e@
} finally{ ./mh9ax
try{ bT}P":*y
if(ps!=null) { CQ2{5
ps.clearParameters(); bCg
{z b#
ps.close(); z71.5n!C
ps=null; Gvv~P3Dm
} i 4
KW
}catch(SQLException e){}
7
2ux3D
DBUtils.closeConnection(conn); p>=YPi/d
} ?8. $A2(Xw
} xRW~xr2h@
public long getLast(){ @jO3+
return lastExecuteTime; j]}A"8=1
} XodA(73`i
public void run(){ cu(2BDfiL
long now = System.currentTimeMillis(); v0 |A
N
if ((now - lastExecuteTime) > executeSep) { 2hAu~#X
//System.out.print("lastExecuteTime:"+lastExecuteTime); =v=a:e
//System.out.print(" now:"+now+"\n"); t>f<4~%MJ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); I\PhgFt@O
lastExecuteTime=now; M4pEwD
executeUpdate(); rOw""mE
} !HL7a]PB
else{ szMh}q"u
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 0G1?
} 6#fl1GdH-
} cjsQm6
} {S(?E_id5b
//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 q17c)]<"
r]Bwp i%
类写好了,下面是在JSP中如下调用。 :}TT1@
_Xd,aLoo
<% AU} e^1h
CountBean cb=new CountBean(); \v{tK;
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); KOGbC`TN<
CountCache.add(cb); ibex:W^
out.print(CountCache.list.size()+"<br>"); d*Dq=.F(
CountControl c=new CountControl(); *:bNK5I.t
c.run(); &Qy_= -]
out.print(CountCache.list.size()+"<br>"); bKj#HHy\I
%>