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: 7"S|GEs:
g xLA1]>{
CountBean.java *]H ./a:1
"w7:{E5e
/* -BjB>Vt
* CountData.java @cXY"hP`
* 0Ifd!
* Created on 2007年1月1日, 下午4:44 T*H4kM
* 66BsUA.h
* To change this template, choose Tools | Options and locate the template under u{_T,k<!
* the Source Creation and Management node. Right-click the template and choose Y- w5S|!
* Open. You can then make changes to the template in the Source Editor. 2Nj0 Hqjq
*/ `bx gg'V
*.K}`89T
package com.tot.count; ~E`l4'g?
zU}0AVlIL:
/** _]Hn:O"o
* 2[:`w),.
* @author M$?~C~b!*
*/ 2h/`RefHJ
public class CountBean { Db3tI#
private String countType; PSy=O\
int countId; ;PbyR}s
/** Creates a new instance of CountData */ 1o$<pZZ
public CountBean() {} fNlUc
public void setCountType(String countTypes){ k/t4
this.countType=countTypes; L'Wcb
=;
} wv*r}{%7g[
public void setCountId(int countIds){ fa!iQfr
this.countId=countIds; gmM79^CEF
} +XIN-8
public String getCountType(){ `@:^(sMo
return countType; 4+uAd"
} ukPV nk
public int getCountId(){ zz$*upxK
return countId; V 1Fdt+#
} LOOv8'%O8
} *=ALns?y
apYf,"|9
CountCache.java [NuayO3
uH7u4f1Q
/* yqAw7GaBN
* CountCache.java |fa3;8!96
* $60+}B`m
* Created on 2007年1月1日, 下午5:01 sNNt0q(
* AAs&wYp8Yh
* To change this template, choose Tools | Options and locate the template under SIg=_oa
* the Source Creation and Management node. Right-click the template and choose #2`tsZ]=I
* Open. You can then make changes to the template in the Source Editor. &-&6ARb7o
*/ b _6j77
%f^TZ,q$
package com.tot.count; rA_e3L@v#[
import java.util.*; u''(;U[
/** |m?0h.O,
* ABx0IdOcI
* @author {Ji[d.cY
*/ kdv>QZ
public class CountCache { UyvFR@
public static LinkedList list=new LinkedList(); le1'r>E$
/** Creates a new instance of CountCache */ s^E%Ukm
public CountCache() {} K!'9wt
public static void add(CountBean cb){ Z3Viil:
if(cb!=null){ z:acrQwJ?1
list.add(cb); )!OEa]
} 6 .*=1P*?
} ty"k
} g~`UC
^6obxwVG
CountControl.java 0t<TZa]V
x2tx{Z
/* V-)q&cbW]q
* CountThread.java iHR?]]RF
* ~s
!+9\Fi
* Created on 2007年1月1日, 下午4:57 \=nY&Ml
* *VD-c
* To change this template, choose Tools | Options and locate the template under ./[t'dgC
* the Source Creation and Management node. Right-click the template and choose z5Po,@W
* Open. You can then make changes to the template in the Source Editor. C:H9C
*/ ,(]hykbXp
dhV=;'
package com.tot.count; _I75[W!
import tot.db.DBUtils; UoBu0Rx
import java.sql.*; F|Ou5WD
/** PInU-"gG
* ;Qw>&24h[
* @author Wb^YqqE
*/ p6>3
p
public class CountControl{ t\'URpa+5%
private static long lastExecuteTime=0;//上次更新时间 3VcG
/rf
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I]zCsT.
/** Creates a new instance of CountThread */ gx#TRp}-
public CountControl() {} v k<By R
public synchronized void executeUpdate(){ "tm2YUG},s
Connection conn=null; 3'IF?](]U
PreparedStatement ps=null; XN??^1{J}]
try{ "S*lI^8Z!
conn = DBUtils.getConnection(); \-c70v63X
conn.setAutoCommit(false); Azu$F5G!n
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ^e)KEkh
for(int i=0;i<CountCache.list.size();i++){ R ]HHbD&;
CountBean cb=(CountBean)CountCache.list.getFirst(); & [4Gv61
CountCache.list.removeFirst(); ,US]
ps.setInt(1, cb.getCountId()); 0f1*#8-6
ps.executeUpdate();⑴ XlR.Y~
//ps.addBatch();⑵ BQ &|=a6
} ;}1*M !
//int [] counts = ps.executeBatch();⑶ Z^s&]
conn.commit(); mpN|U(n
}catch(Exception e){ ;CFI*Wfp
e.printStackTrace(); # M%-q8
} finally{ O?rVa:\
try{ :+Y+5:U]
if(ps!=null) { s [@II]
ps.clearParameters(); W}XDzR'<
ps.close(); yX<Sk q
ps=null; p
0R)Yc+;
} S9U`-\L0
}catch(SQLException e){} MejM(o_kk
DBUtils.closeConnection(conn); OZDnU6
} abx/h#_q
} qfx=
public long getLast(){ 3)p#}_u{
return lastExecuteTime; RCgZ GP
} {rf.sN~M
public void run(){ 3~%9;.I3!
long now = System.currentTimeMillis(); 1s/t}J~zZ
if ((now - lastExecuteTime) > executeSep) { SW#
5px`
//System.out.print("lastExecuteTime:"+lastExecuteTime); 4h|sbB"t
//System.out.print(" now:"+now+"\n"); w%KU@$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); @tR:}J*9s
lastExecuteTime=now; 0%#ZupN
executeUpdate(); ~#pQWa5
} p^<*v8,~7
else{ 2E;UHR
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =c[9:&5Q
} `ZC_F!
E
} {f<2VeJ
} Fe{lM'
8
//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 dXg.[|S*
OXT 5
y)
类写好了,下面是在JSP中如下调用。 -Uh3A\#(
ewvFUD'j
<% :I[nA?d[&
CountBean cb=new CountBean(); STtjkZ6
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); sZxf.
CountCache.add(cb); $!H;,Jxv
out.print(CountCache.list.size()+"<br>"); .}=gr+<bf
CountControl c=new CountControl(); Xy5#wDRC
c.run(); NI,i)OSEN
out.print(CountCache.list.size()+"<br>"); Eg$ I
%>