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: KF)i66
YP,PJnJU8
CountBean.java t,,^^ll
N3<Jh
/* .)w0C%]
* CountData.java 3)a29uc:U
* ?xZmm%JF
* Created on 2007年1月1日, 下午4:44 4#q JX)/
* D$E9%'ir
* To change this template, choose Tools | Options and locate the template under s_!Z+D$K
* the Source Creation and Management node. Right-click the template and choose _4$DnQ6&
* Open. You can then make changes to the template in the Source Editor. vM/v}6;_K2
*/ KT71%?P
bobkT|s^s
package com.tot.count; I:<R@V<~#
m=B0!Z1xx
/** !++62Lf
* 9K<a}QJP
* @author FOi`TZ8
*/ ~*[4DQ[\
public class CountBean { 5FI>T=QF
private String countType; 1 ,'^BgI,
int countId; c&-$?f
r
/** Creates a new instance of CountData */ C:MGi7f
public CountBean() {} x~^I/$
public void setCountType(String countTypes){ |81N/]EER
this.countType=countTypes; D:tZiS=0
} ycD.:w p\'
public void setCountId(int countIds){ YCO:bBmp:
this.countId=countIds; @98SC}}u
} %)Dd{|c
public String getCountType(){ UE w3AO
return countType; T9-a
uK0d
} yW?%c#9D
public int getCountId(){ T
l(uqY?9
return countId; |9]K:A
} $:II@=
} #9VY[<
#/<Y!qV&
CountCache.java PSS/JFZ^
, vyx`wDd
/* D(U3zXdO
* CountCache.java @(fY4]K
* N06O.bji
* Created on 2007年1月1日, 下午5:01 agT[y/gb
* :-" jKw
* To change this template, choose Tools | Options and locate the template under "IJMvTmj
* the Source Creation and Management node. Right-click the template and choose [Od9,XBa
* Open. You can then make changes to the template in the Source Editor. .fY<"2g
*/ l>Ja[`X@
^!_7L4&y
package com.tot.count; ':)j@O3-
import java.util.*; 5G;^OI!g
/** WV"QY/e3
* 6D"`FPC
* @author w]o5L
*/ l zPS
RT
public class CountCache { luk2fi<$
public static LinkedList list=new LinkedList(); [Vp2!"
/** Creates a new instance of CountCache */ 'xoE
[0!
public CountCache() {} @k6}4O?{
public static void add(CountBean cb){ ?9@Af{b t2
if(cb!=null){ \'tz|
list.add(cb); $'{`i5XB
} vqz#V=J{
} T)f_W
} P Xn>x8z
1'm`SRX#e
CountControl.java )"jn{%/t
J*KBG2+13
/* Tc5OI' -V
* CountThread.java 3l(;Pt-yI
* aDvO(C
* Created on 2007年1月1日, 下午4:57 hs_|nr0;[
* Y_>-p(IH
* To change this template, choose Tools | Options and locate the template under ~V"cLTj"
* the Source Creation and Management node. Right-click the template and choose C|IQM4
* Open. You can then make changes to the template in the Source Editor. ur,"K'w
*/ bTy)0ta>AF
<;0N@
package com.tot.count; )X!DCL:16
import tot.db.DBUtils; | 4oM+n;Y
import java.sql.*; J~'Q^O3@
/** (g2r\hI
* NF(IF.8G
* @author XAxI?y[c
*/ )/T$H|
public class CountControl{ S Y>,kwHO
private static long lastExecuteTime=0;//上次更新时间 @TPgA(5NR
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 7cP[o+
/** Creates a new instance of CountThread */ vJAAAS
public CountControl() {} 1S]gD&V
public synchronized void executeUpdate(){ IH5} Az
Connection conn=null; :Z]hI+7
PreparedStatement ps=null; ~7 L)n
try{ UEQ'D9
conn = DBUtils.getConnection(); ~eOj:H
conn.setAutoCommit(false); fQTA@WAr
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1o~U+s_r
for(int i=0;i<CountCache.list.size();i++){ s]<r
CountBean cb=(CountBean)CountCache.list.getFirst(); v\9,j
CountCache.list.removeFirst(); cU5"c)$'
ps.setInt(1, cb.getCountId()); $N+{r=
ps.executeUpdate();⑴ hB$Y4~T%
//ps.addBatch();⑵ m/c&/6nk
} %OTA5
//int [] counts = ps.executeBatch();⑶ 'Kzr-)JS
conn.commit(); SAE'?_
}catch(Exception e){ cvXI]+`<3\
e.printStackTrace(); +s(IQt
} finally{ K9O,7h:x
try{ FDd>(!>
if(ps!=null) { Xt,,AGm}
ps.clearParameters(); KkL:p?@n
ps.close(); ]1|Ql*6y,
ps=null; nL(%&z \4
} CNRU"I+jU
}catch(SQLException e){} cYWy\+
DBUtils.closeConnection(conn); OQL09u
} )4L%zl7
} :_QAjU
public long getLast(){ ['Y+z2k
return lastExecuteTime; |RAQ% VXm
} 9<(K6Q
public void run(){ 8K JQ(
long now = System.currentTimeMillis(); +65~,e
if ((now - lastExecuteTime) > executeSep) { jl e%|8m&@
//System.out.print("lastExecuteTime:"+lastExecuteTime); ci_v7Jnwo
//System.out.print(" now:"+now+"\n"); #u<oEDQ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 51ajE2+X&
lastExecuteTime=now; U_}A{bFG
executeUpdate(); 01{r^ZT`RH
} ?y*+^E0
else{ 6`4W,
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Y zBA{FE
} /@:up+$
} nc\C4g
} ? __aVQ7
//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 d7_ g
u
0n<(*bfW
类写好了,下面是在JSP中如下调用。 w^dueP7J
$uFh$f
<% Q{l*62Bx
CountBean cb=new CountBean(); v<7Gln
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); D _bkUR1
CountCache.add(cb); +{C9uY)$vf
out.print(CountCache.list.size()+"<br>"); `J=1&ae