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: ~(V\.hq
<IZt]P
CountBean.java *&I>3;~%^}
2%pED
xui
/* '0D$C},^|8
* CountData.java xG/Q%A
* U=G49~E
* Created on 2007年1月1日, 下午4:44 ]j3> =Jb;
* Mh7m2\fLbd
* To change this template, choose Tools | Options and locate the template under yiZtG#6K{
* the Source Creation and Management node. Right-click the template and choose 0)WAQt\/
* Open. You can then make changes to the template in the Source Editor. >R F|Q
*/ 2$Mnwxfk
>$ZG=&
package com.tot.count; oN1D&*
l
;:IL\*1I
/** }Z"iW/?"
* (t-hi8"
* @author f)*"X[)o
*/ 1tNL)x"w
public class CountBean { %Ln`c.C
private String countType; : .x((
FU
int countId; "|8oFf)l@B
/** Creates a new instance of CountData */ eq6O6-
public CountBean() {} DC8#b`j
public void setCountType(String countTypes){ ~*iF`T6
this.countType=countTypes; LlX)xJ
} |C4fg6XDL
public void setCountId(int countIds){ ^#:;6^Su
this.countId=countIds; IA` voO$
} 8TP$ ?8l
public String getCountType(){ -%`~3*L
return countType; w jkh*Y
} 6|jZv~rS$
public int getCountId(){ 2`f{D~w
return countId; w<9rTHG8,
} Fv~lasW[
} _RIU,uJs
!J7`frv"(
CountCache.java z(\aJW
[{7#IZL
/* _<S!tW
* CountCache.java K}l3t2uk
* =
7y-o
* Created on 2007年1月1日, 下午5:01 arL>{mj
* 7H3v[ f^Q
* To change this template, choose Tools | Options and locate the template under 59Pc:Gg;
* the Source Creation and Management node. Right-click the template and choose R0-0
* Open. You can then make changes to the template in the Source Editor. *igmi9A
*/ T3{O+aRt
'8q3ub<\
package com.tot.count; z0 9Gp}^;
import java.util.*; P~\rP6
;
/** MRLiiIrq,5
* X"{%,]sb G
* @author :'p)xw4K|
*/ *O_fw 0jV
public class CountCache { *$eH3nn6g
public static LinkedList list=new LinkedList(); _w\9
\<%
/** Creates a new instance of CountCache */ 6 eSo.@*l
public CountCache() {} SxRJ{m~
public static void add(CountBean cb){ j[r}!;O
if(cb!=null){ kk=n&M
list.add(cb); ZsP ^<
} gQ\.|'%
} GeR#B;{
} xvTtA61Vp
Z@Rm^g]o
CountControl.java KR?;7*qF
!P A:#]J
/* 9<Pg2#*N0
* CountThread.java ^N={4'G)
* =!\Nh,\eQ
* Created on 2007年1月1日, 下午4:57 #p(gB)o:l
* %%NoXW
* To change this template, choose Tools | Options and locate the template under eQ>Ur2H8n
* the Source Creation and Management node. Right-click the template and choose
p'h'Cz
* Open. You can then make changes to the template in the Source Editor. _5p$#U`
*/ }QI \K
1ubu~6
package com.tot.count; x/s:/YN'
import tot.db.DBUtils; |
1B0
import java.sql.*; #*.!J zOg
/** oZ%uq78#[%
* &hWELZe0vv
* @author NljpkeX'
*/ (ks>F=vk*
public class CountControl{ 5sY$
private static long lastExecuteTime=0;//上次更新时间 ]KFh 1
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S F)$b
/** Creates a new instance of CountThread */ @8W@I|
public CountControl() {} #&|"t<}
public synchronized void executeUpdate(){ v<1@"9EH
Connection conn=null; 84(Jo_9
PreparedStatement ps=null; .V;,6Vq
try{ HkD.W6A3
conn = DBUtils.getConnection(); !4p{b f
conn.setAutoCommit(false); Kki(A4;7F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); d4b!
r
for(int i=0;i<CountCache.list.size();i++){ 7\UHADr
CountBean cb=(CountBean)CountCache.list.getFirst(); l+Wux$6U
CountCache.list.removeFirst(); $J6
.0O
ps.setInt(1, cb.getCountId()); (:bf m
ps.executeUpdate();⑴ /4r2B.91O
//ps.addBatch();⑵ 0fqcPi
} q'jOI_b
//int [] counts = ps.executeBatch();⑶ e i=
4u'
conn.commit(); \'y]m B~k
}catch(Exception e){
7UBDd1
e.printStackTrace(); 5Dkb/Iagi
} finally{ s@L ;3WdO
try{ N]W*ei
if(ps!=null) { Nn_fhc>
ps.clearParameters(); dy6zrgxygP
ps.close(); 2?
E;(]dQ
ps=null; =CQfs6np:N
} n{QyqI
}catch(SQLException e){} MXSD8]je
DBUtils.closeConnection(conn); g(&cq
} NO*,}aeG
}
:a*>PMTn
public long getLast(){ "Da1BuX\
return lastExecuteTime; T, #-: }
} *8)?ZZMM
public void run(){ C1-U2@
long now = System.currentTimeMillis(); :-x?g2MY
if ((now - lastExecuteTime) > executeSep) { a?-J j\q
//System.out.print("lastExecuteTime:"+lastExecuteTime); m'2F#{
//System.out.print(" now:"+now+"\n"); Ft>B% -;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ["nWIs[h
lastExecuteTime=now; DGJ:#UE
executeUpdate(); ?c8~VQaQ
} _f!ko<52
else{ I[%IW4jJ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); %E%=Za
} .w4|$.H
} G!FdTvx$
} n~lB}
//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 WoXAOj%iW
9'(_*KSH
类写好了,下面是在JSP中如下调用。 'pA%lc)
P"7` :a
<% *A9v8$
CountBean cb=new CountBean(); ?,VpZ%Df2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); v J0v6\
CountCache.add(cb); B>i%:[-e
out.print(CountCache.list.size()+"<br>"); S\Z*7j3;M
CountControl c=new CountControl(); S[L@8z.Sj
c.run(); ytj});,>
out.print(CountCache.list.size()+"<br>"); qBk[Afjgz
%>