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: ]/6z;
~3U
1GRCV8"Z^
CountBean.java 4J?0bZ
G_JA-@i%
/* 372rbY
* CountData.java u#~RkY7s
* ; 2#y7!
* Created on 2007年1月1日, 下午4:44 Tidn-2L73O
* t?gic9
q
* To change this template, choose Tools | Options and locate the template under T!{w~'=F
* the Source Creation and Management node. Right-click the template and choose NxY#NaE:?4
* Open. You can then make changes to the template in the Source Editor. ^76]0`gS
*/ re<{
>
t@;p
package com.tot.count; |Ez>J+uye(
B[Scr5|
/** P+sW[:
* 3?yg\
* @author (CL%>5V
*/ i]4I [!
public class CountBean { n@i HFBb
private String countType; T-L||yE,h
int countId; r6qj7}\
/** Creates a new instance of CountData */ z<;HQX,
public CountBean() {} Or+U@vAnk
public void setCountType(String countTypes){ _[3D
this.countType=countTypes; }X6m:#6
} "sCRdx]_
public void setCountId(int countIds){ +\A,&;!SR
this.countId=countIds; 3hH<T.@)
} rlLMT6r.8
public String getCountType(){ C!!M%P
return countType; 6 "sSo j
} B9 uoVcW
public int getCountId(){ yyJf%{
return countId; !.gIHY
} ITBE|b
} p
l0\2e)
3$R1ipb
CountCache.java +'a^f5
!pW0qX\1n
/* T^KKy0ZGM
* CountCache.java /~?*=}c^m
* GxxW&y
* Created on 2007年1月1日, 下午5:01 %> eiAB_b
* 2zb"MEOS5
* To change this template, choose Tools | Options and locate the template under j^JPZ{ej?
* the Source Creation and Management node. Right-click the template and choose fr3d
* Open. You can then make changes to the template in the Source Editor. L2z[
*/ SnfYT)Ph
/3T1U
package com.tot.count; Gd=RyoJl
import java.util.*; KpGhQdR#
/** "+s++@
z
* GefTdO.&
* @author HV|,}Wks6s
*/ r19
pZAc
public class CountCache { X"Swi&4
public static LinkedList list=new LinkedList(); +\9NDfYIA
/** Creates a new instance of CountCache */ H
<l7ZS:
public CountCache() {} a=2%4Wmz
public static void add(CountBean cb){ CdQ!GS<'y
if(cb!=null){
t{96p77)=
list.add(cb); Z9|P'R(l
} 7:1Lol-V
} QWYJ*
} m_]Y{3C
ez$(c
CountControl.java Rm( "=(
/8S>;5hvK@
/* T~e.PP
* CountThread.java |{ip T SH
* C6PdDRf
* Created on 2007年1月1日, 下午4:57 W6Fo6a"<
* V,njO{Q
* To change this template, choose Tools | Options and locate the template under 7.oM J
* the Source Creation and Management node. Right-click the template and choose fHFE){
* Open. You can then make changes to the template in the Source Editor. z}
#JK?u
*/ 4r}51 N\
?@86P|19
package com.tot.count; %ET+iIhK
import tot.db.DBUtils; ~DwpoeYX
import java.sql.*; XL^GZ
/** <5051UEu
* 2+XAX:YD
* @author WyiQoN'q
*/ |6-nbj
public class CountControl{ 2>%=U~5
private static long lastExecuteTime=0;//上次更新时间 HRA|q
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 x%B%f`]8
/** Creates a new instance of CountThread */ 2,b$7xaf
public CountControl() {} !nnC3y{G
public synchronized void executeUpdate(){ >(<f 0
Connection conn=null; $&c*'3
PreparedStatement ps=null; *.[.
{qG(
try{ Pm7}"D'/
conn = DBUtils.getConnection(); tw@X>
G1z
conn.setAutoCommit(false); PJ#,2=n~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ~n_HP_Kf?
for(int i=0;i<CountCache.list.size();i++){ e0 ecD3
CountBean cb=(CountBean)CountCache.list.getFirst(); UN#S;x*
CountCache.list.removeFirst(); |G<|F`Cj
ps.setInt(1, cb.getCountId()); ccxNbU
ps.executeUpdate();⑴
0y\Z9+G:
//ps.addBatch();⑵ i%?* @uj
} *;FdD{+
//int [] counts = ps.executeBatch();⑶ a<e[e>
conn.commit(); SpBy3wd
}catch(Exception e){ DEgXQ[
e.printStackTrace(); Lg hfM"g
} finally{ KI.hy2?e
try{ vY3h3o
if(ps!=null) { n@3>6_^rwT
ps.clearParameters(); Q>z8IlJ}
ps.close(); y~V(aih}D
ps=null; *-X[u:
} %BODkc Zh
}catch(SQLException e){} PA*5Bk="q
DBUtils.closeConnection(conn); !4!~Lk=
} bN.Pex
} DY*N|OnqJ
public long getLast(){ kJR`:J3DJ
return lastExecuteTime; 2~V*5~fb
} lB4WKn=?Kl
public void run(){ 6S#Cl>v
long now = System.currentTimeMillis(); 7yQ4*UB
if ((now - lastExecuteTime) > executeSep) { U<XG{<2
//System.out.print("lastExecuteTime:"+lastExecuteTime); "dlVk~
//System.out.print(" now:"+now+"\n"); /-s6<e!
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); |s_GlJV.
lastExecuteTime=now; LzL
So"n
executeUpdate(); E{(;@PzE
} xIn:ZKJ'
else{ i.#:zU%o
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !,PWb3S
} j>kqz>3
} `]aeI'[}R
} i
XN1I
//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
\=o-
wd6owr
类写好了,下面是在JSP中如下调用。 &^nGtW%a 9
%so]L+r2!
<% wL[
M:
CountBean cb=new CountBean(); ,zc(t<|-y
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); W g!
Lfu
CountCache.add(cb); 2g<Xtt7+o
out.print(CountCache.list.size()+"<br>"); jEwIn1
CountControl c=new CountControl(); !r-F>!~
c.run(); 2mU.7!g)
out.print(CountCache.list.size()+"<br>"); 7>RY/O;Z,
%>