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: q].n1w[
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CountBean.java ? dD<KCbP,
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/* HZ>8@AVa\
* CountData.java WrzyBG_
* i]sz*\P~
* Created on 2007年1月1日, 下午4:44 =[X..<bW9:
* Yr7%C
* To change this template, choose Tools | Options and locate the template under iP nu *29
* the Source Creation and Management node. Right-click the template and choose EUxkYl
* Open. You can then make changes to the template in the Source Editor. 4O~E4" ]
*/ )}{V#,xz@
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package com.tot.count; e~Hx+Qp.G
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/** ,sU#{.(
* \=kre+g
* @author c(:qid
*/ +1`Zu$|
public class CountBean { z@\r V@W5
private String countType; ~KtA0BtC
int countId; Y6J7N^
/** Creates a new instance of CountData */ N|G=n9p
public CountBean() {} Zjo8/
public void setCountType(String countTypes){ u2p5*gzZ
this.countType=countTypes; qT
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} O^tH43C
public void setCountId(int countIds){ "!\O N)l*
this.countId=countIds; SHM
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} !`S`%\"
public String getCountType(){ BPFd'-O)
return countType; UD0via
} [#}A]1N
public int getCountId(){ h"b;e2
return countId; .Vy*p")"
} Y ;JPr
} >o\s'i[
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CountCache.java }=d]ke9_
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/* t")+L{
* CountCache.java %&D,|Yl6
* Cpyv@+;D
* Created on 2007年1月1日, 下午5:01 h}vzZZ2,
* pWU3?U
* To change this template, choose Tools | Options and locate the template under b?h)~j5
* the Source Creation and Management node. Right-click the template and choose ) ?AlQA
* Open. You can then make changes to the template in the Source Editor. cy0
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*/ \ow3_^Bk
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package com.tot.count; bo;;\>k
import java.util.*; IV"OzQONx
/** ^>?E1J3u
* s|/m}n
* @author sk0N=5SB-
*/ a{?`yO/ 2
public class CountCache { mY}_9rTn|
public static LinkedList list=new LinkedList(); +Xb )bfN
/** Creates a new instance of CountCache */ dMcCSwYh
public CountCache() {} AixQR[Ul*c
public static void add(CountBean cb){ 95`Q=I|i
if(cb!=null){ +3@d]JfMh
list.add(cb); QQQ3U
} I|RMxx y;
} jafIKSD]%
} P>*g'OK^!G
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CountControl.java Xp(e/QB
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/* RoL5uha,l
* CountThread.java M"q]jeaM
* =44hI86
* Created on 2007年1月1日, 下午4:57 ^LA.Y)4C2%
* 2>Uy`B|f
* To change this template, choose Tools | Options and locate the template under FQV]/
* the Source Creation and Management node. Right-click the template and choose L&C<-BA/
* Open. You can then make changes to the template in the Source Editor. nG0Uv%?{pj
*/ c&A;0**K,
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package com.tot.count; (IAc*V~
import tot.db.DBUtils; 0SoU\/kUi
import java.sql.*; W{0gtT0
/** =y5~7&9'
* V}leEf2'
* @author KNR_upO8
*/ .zm'E<
public class CountControl{ n?@3+wG
private static long lastExecuteTime=0;//上次更新时间 c"vF i~Db
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3f 1@<7*
/** Creates a new instance of CountThread */ &VY(W{\eY
public CountControl() {} (-V=&F_
public synchronized void executeUpdate(){ oiG@_YtR
Connection conn=null; D.e4S6\&
PreparedStatement ps=null; UV ?.KVD~
try{ x#mZSSd
conn = DBUtils.getConnection(); S C'F,!
conn.setAutoCommit(false); gq$]jWtCD
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 9J"Y
for(int i=0;i<CountCache.list.size();i++){ r#Pkhut
CountBean cb=(CountBean)CountCache.list.getFirst(); 410WWR&4_
CountCache.list.removeFirst(); R~z@voM*<
ps.setInt(1, cb.getCountId()); m,zZe}oJ
ps.executeUpdate();⑴ o_2mSD!
//ps.addBatch();⑵ }]-SAM
} ?[[K6v}q{
//int [] counts = ps.executeBatch();⑶ 4JF8S#8B
conn.commit(); Ri,8rf0u
}catch(Exception e){ owYSR?aG
e.printStackTrace(); Y0kDHG
} finally{ oB3,"zY
try{ D,aJ`PK~
if(ps!=null) { !&~8j7{
ps.clearParameters(); \O]1QM94Y
ps.close(); <K8$00lm
ps=null; ` ,B&oV>
} J6*Zy[)%&S
}catch(SQLException e){} HvITw%`
DBUtils.closeConnection(conn); yIS.'mK
} ;l]OmcL
} |+?ABPk"
public long getLast(){ =y3gnb6
return lastExecuteTime; w|6;Pf~1y)
} C*e)UPK`
public void run(){ >R5qhVYFb
long now = System.currentTimeMillis(); PB
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if ((now - lastExecuteTime) > executeSep) { 'o2V}L'nG
//System.out.print("lastExecuteTime:"+lastExecuteTime); YF{ KSGq
//System.out.print(" now:"+now+"\n"); 7=.}484>J
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 4<`x*8`
,
lastExecuteTime=now; fo"dX4%}
executeUpdate(); u9AXiv+K
} 'E/vE0nN?
else{ m"B)%?C#
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2<$C6J0HM
} 5t$ZEp-
} }2sc|K^
} 8aCa(Xu(H
//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 y{Wtm7fnA
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类写好了,下面是在JSP中如下调用。 G0sg\]
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<% h[()!\vBy
CountBean cb=new CountBean(); F, ^<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); []K5l%
CountCache.add(cb); #;F1+s<|QJ
out.print(CountCache.list.size()+"<br>"); 9v(&3,)a
CountControl c=new CountControl(); 5a9PM(
c.run(); v=b`kCH}
out.print(CountCache.list.size()+"<br>"); xg~
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