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: 'l;|t"R12
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CountBean.java [u:_Jqf-
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/* _De;SB%V
* CountData.java #96a7K
* [<t*&Kr+o
* Created on 2007年1月1日, 下午4:44 XRkqMq%
* COafVlJ,l
* To change this template, choose Tools | Options and locate the template under XJ+sm^`vOf
* the Source Creation and Management node. Right-click the template and choose ^M"g5+q
* Open. You can then make changes to the template in the Source Editor. e{=$4F
*/ H2} i .
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package com.tot.count; BlCKJp{m$
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/** _DQdo
* #]2u!ama
* @author s0CRrMk
*/ y5I7pbe
public class CountBean { r|+Zni]
private String countType; 9w1)Mf}
int countId; l_WY];a
/** Creates a new instance of CountData */ <Bwu N,}
public CountBean() {} #@G2n@Hj
public void setCountType(String countTypes){ [Pay<]c6g
this.countType=countTypes; cP,jC(<N
} `S|gfJ
public void setCountId(int countIds){ r\zK>GVm_
this.countId=countIds; 0#G"{M
}
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public String getCountType(){ X'Oo ogu
return countType; <[Vr(.A
} UOyP6ej
public int getCountId(){ Kmtr.]Nj
return countId; ]?2AFkF
} W!g
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} %2.T1X%!
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CountCache.java _v\QuI6
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/* ]TQjk{X<
* CountCache.java ?~$y3<[
* <]<50
* Created on 2007年1月1日, 下午5:01 wBf
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* *m7e>]-
* To change this template, choose Tools | Options and locate the template under /Wa+mp
* the Source Creation and Management node. Right-click the template and choose ,AJd2i x
* Open. You can then make changes to the template in the Source Editor. OA8pao~H
*/ \l`;]cA
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package com.tot.count; [4gv_g
import java.util.*; Y\rKw!u_!
/** c;WS !.
* 0Bll6Rd
* @author 8n56rOW!
*/ /w|YNDA]j
public class CountCache { fRbVc
public static LinkedList list=new LinkedList(); E^rN)
/** Creates a new instance of CountCache */ [wExjLW
public CountCache() {} P?I"y,_ p
public static void add(CountBean cb){ TnC'<zm9!
if(cb!=null){ Tb}b*d3
list.add(cb); tIg_cY_y
} /<n_X:[)
} d00r&Mc
} 3KqylC&.
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CountControl.java (*p |Kzu
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/* @E}4LTB
* CountThread.java P\Ka'i
* Ft07>E$/Q^
* Created on 2007年1月1日, 下午4:57 {P*RA'H3G
* 0_ ;-QAd
* To change this template, choose Tools | Options and locate the template under 6(eyUgnb
* the Source Creation and Management node. Right-click the template and choose #e=[W))
* Open. You can then make changes to the template in the Source Editor. ZqSczS7uf
*/ 7,:QFV
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package com.tot.count; ,i'>+Ix<
import tot.db.DBUtils; bkV_ ^8
import java.sql.*; FvRog<3X
/** CrK}mbe
* N^O.P
* @author F&ux9zP
*/ gI[xOK#
public class CountControl{ i`X/d=
private static long lastExecuteTime=0;//上次更新时间 ?(E$|A
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 fi1tF/`
/** Creates a new instance of CountThread */ ,}J(&
public CountControl() {} |TkO'QN
public synchronized void executeUpdate(){ C}7Sh6
Connection conn=null; Ug/b;( dJ'
PreparedStatement ps=null; BYRf MtT@+
try{ Z[ys>\_To
conn = DBUtils.getConnection(); p2\@E}
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conn.setAutoCommit(false); mzDbw-#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -_B*~M/vV`
for(int i=0;i<CountCache.list.size();i++){ cZA l.}/
CountBean cb=(CountBean)CountCache.list.getFirst(); gd2cwnP
CountCache.list.removeFirst(); *M09Y'5]
ps.setInt(1, cb.getCountId()); GP1b/n3F1
ps.executeUpdate();⑴ PyK)ks!6
//ps.addBatch();⑵ q5Z]Z.%3O
} 0ZTT^2R
//int [] counts = ps.executeBatch();⑶ :GK]"sNC
conn.commit(); af.yC[
}catch(Exception e){
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e.printStackTrace(); qEE
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} finally{ !ouJ3Jn
try{ T-0fVTeN
if(ps!=null) {
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ps.clearParameters(); OLTgBXh
ps.close(); `StlG=TB8
ps=null; U8 '}(
} r761vtC#
}catch(SQLException e){} ("?V|
DBUtils.closeConnection(conn); 8!sl) R
} ogtl
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} zr2oU '+
public long getLast(){ *6<<6f`(
return lastExecuteTime; 'b~,/lZd
} E&9BeU
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public void run(){ >We4F2?
long now = System.currentTimeMillis(); +K {J*
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if ((now - lastExecuteTime) > executeSep) { JYc;6p$<i
//System.out.print("lastExecuteTime:"+lastExecuteTime); kIrb;bZ+l
//System.out.print(" now:"+now+"\n"); ^\KZE|^3@
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Dn~c
lastExecuteTime=now; H[S[ y
executeUpdate(); q8#zv_>K
} p?PK8GL
else{ OO#_0qK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); c&X2k\
} ~Z-o2+xA
} /-s-W<S[
} X;'H@GU0
//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 P:KS*lOp
#q?'<''d,
类写好了,下面是在JSP中如下调用。 O/ybqU\7
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<% kn%i#Fz
CountBean cb=new CountBean();
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); /0 CS2mLC
CountCache.add(cb); []OmztB
out.print(CountCache.list.size()+"<br>"); x18(}4
CountControl c=new CountControl(); &Ql$7:r
c.run(); p4-UW;Xu
out.print(CountCache.list.size()+"<br>"); X)Zc*9XA
%>