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: ~(^*?(Z
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CountBean.java chzR4"WZFt
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/* [=3tAPpzK
* CountData.java pF+wHMhUe
* +J8/,d
* Created on 2007年1月1日, 下午4:44 9$@ g;?}Ps
* ~c$ts&Cl
* To change this template, choose Tools | Options and locate the template under C?|3\@7
* the Source Creation and Management node. Right-click the template and choose ~9YA!48
* Open. You can then make changes to the template in the Source Editor. N@a'd0oTd
*/ |ZlT>u
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package com.tot.count; y$V)^-U>fw
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/** '?3z6%
* >=:T
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* @author QF/u^|f
*/ Z1&GtM
public class CountBean { [Fj+p4*N
private String countType; M8j(1&(:
int countId; &ntP~!w
/** Creates a new instance of CountData */ |
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public CountBean() {} bRz^=
public void setCountType(String countTypes){ RXS| -_$
this.countType=countTypes; sxwW9_C
} pQ(eF0KG
public void setCountId(int countIds){ Ss! 3{VW
this.countId=countIds; 5=h'!|iY
} 1$D`Z/N"A
public String getCountType(){ e0WSHg=6@
return countType; yZ)aKwj%U
} |abst&yp
public int getCountId(){ U3+_'"
return countId; <i\zfa'6
} 'Mx K}9
} 7r[%|:
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CountCache.java GKujDx+h
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/* ^@*zH?Rx{
* CountCache.java RR"WO
* Y\Qxdq
* Created on 2007年1月1日, 下午5:01 ])j|<W/
* \M"^Oe{Dy?
* To change this template, choose Tools | Options and locate the template under u$=ogp=0
* the Source Creation and Management node. Right-click the template and choose w*xUuwi
* Open. You can then make changes to the template in the Source Editor. }-q`&1!t
*/ I<(.i!-x
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package com.tot.count; rjAkpAT
import java.util.*; kbp(
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/** ={E!8"
* 6SBvn%
* @author p@7i=hyt`p
*/ ;.Oh88|k
public class CountCache { .4C[D{4
public static LinkedList list=new LinkedList(); tGO[A#9a
/** Creates a new instance of CountCache */ ^A"lkV7
public CountCache() {} K
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public static void add(CountBean cb){ -wRyMY_D
if(cb!=null){ Jt>[]g$
list.add(cb); P`3s\8[Q
} `\F%l?aY
} Cs[7% j
} Ei9_h
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CountControl.java QTjftcu
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/* x\J;ZiWwW
* CountThread.java m,gy9$
* V)1:LLRW
* Created on 2007年1月1日, 下午4:57 yg+IkQDf4U
* 0gOrW=
* To change this template, choose Tools | Options and locate the template under Rw/JPC"
* the Source Creation and Management node. Right-click the template and choose yLgKS8b
* Open. You can then make changes to the template in the Source Editor. 2}Z4a\YX
*/ ',H$zA?i
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package com.tot.count; 1ntkM?
import tot.db.DBUtils; !V]MLA`
import java.sql.*; L;--d`[
/** v :+8U[x
* 7moElh v
* @author .qIy7_^
*/ 6_%]\37_Z
public class CountControl{ 2l)9Lz=;L
private static long lastExecuteTime=0;//上次更新时间 Z`oaaO
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 x>^3]m
/** Creates a new instance of CountThread */ &vFqe,Z
public CountControl() {} Kl aZZJ
public synchronized void executeUpdate(){ j
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Connection conn=null; 4P4 Fo1
PreparedStatement ps=null; Zc%foK{
try{ P!FEh'.
conn = DBUtils.getConnection(); kByrhK5U
conn.setAutoCommit(false); #6N+5Yx_[
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); AvrL9D
for(int i=0;i<CountCache.list.size();i++){ 'wz\tT ^
CountBean cb=(CountBean)CountCache.list.getFirst(); o=-Vt,2{
CountCache.list.removeFirst(); b\?7?g
ps.setInt(1, cb.getCountId()); ljYpMv.>xG
ps.executeUpdate();⑴ aVppOxA
//ps.addBatch();⑵ &SjHrOG?
} Z&dr0w8
//int [] counts = ps.executeBatch();⑶ b.R!2]T]i^
conn.commit(); *^@#X-NG
}catch(Exception e){ SE;Tujwhqi
e.printStackTrace(); =sE2}/g
} finally{ #*Yi4Cn<
try{ mvHh"NJ
if(ps!=null) { :Su #xI
ps.clearParameters(); jD '
ps.close(); kqKj7L
ps=null; lh\ICN\O
} \LdmGv@&
}catch(SQLException e){} wC(vr.,F
DBUtils.closeConnection(conn); '?"t<$b
} ceFsGdS
} (odR'#
public long getLast(){ r zM Fof
return lastExecuteTime; Ew
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} %XP_\lu]
public void run(){ D!bKm[T
long now = System.currentTimeMillis(); n+{HNr
if ((now - lastExecuteTime) > executeSep) { ~K~b`|1
//System.out.print("lastExecuteTime:"+lastExecuteTime); qIbg
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//System.out.print(" now:"+now+"\n"); rU=b?D)n!w
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (C`FicY
lastExecuteTime=now; ?Oy'awf_
executeUpdate(); E0"10Qbi
} I 1 b
else{ R^J.?>0
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Q_&}^
} hrs#ZZ:E
} q&XCX$N
} M.ZEqV+k
//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 jWH{;V&ZV
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类写好了,下面是在JSP中如下调用。 E?3 0J3S
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<% iNod</+"K
CountBean cb=new CountBean(); .FIt.XPzv
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); omM&{ }8 g
CountCache.add(cb); ~ X-)_zH
out.print(CountCache.list.size()+"<br>"); p?+lAbe6H
CountControl c=new CountControl(); Sa3I?+
c.run(); B{7Kzwh;
out.print(CountCache.list.size()+"<br>"); 1. #
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