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: gAztdAsLM
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CountBean.java ibQ
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/* juF=ZW%i
* CountData.java ;-py h(
* "k @[7
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* Created on 2007年1月1日, 下午4:44 8VQ!&^9!U#
* q\i&ERr
* To change this template, choose Tools | Options and locate the template under (Ytr&gh;0
* the Source Creation and Management node. Right-click the template and choose K O\HH
* Open. You can then make changes to the template in the Source Editor. mCg^Y)Q
*/ Nk\ni>Du3
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package com.tot.count; T>(X`(
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/** dg#Pb@7a
* k -R"e
* @author @o?Y[BR
*/ U.~G{H`G,u
public class CountBean { J`[jub
private String countType; P~!,"rY
int countId; ZoJqJWsd
/** Creates a new instance of CountData */ ydO G8EI
public CountBean() {} fP4P'eI
public void setCountType(String countTypes){ !'#
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this.countType=countTypes; a)r["*bTx
} s Adb0 A
public void setCountId(int countIds){ t`hes
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this.countId=countIds; W(ryL_#;
} j]%XY+e
public String getCountType(){ @ls/3`E/5E
return countType; fATVAv
} @?]>4+Oa0
public int getCountId(){ T<Y*();Zo
return countId; J"E _i]
} s1[.L~;J
} ~e,l2
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CountCache.java ZZHQ?p-
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/* R%2.N!8v
* CountCache.java 58HAl_8W
* E6xdPjoWy
* Created on 2007年1月1日, 下午5:01 DEkv,e
* G,<d;:
* To change this template, choose Tools | Options and locate the template under "v0bdaQH3
* the Source Creation and Management node. Right-click the template and choose *K?UWi#$
* Open. You can then make changes to the template in the Source Editor. 0>-}c>
*/ ]57Ef'N
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package com.tot.count; P $y'``
import java.util.*; ,{(XT7hr
/** Mby4(M+&n
* {=d}04i)E"
* @author +{;wOQ.
*/ *(vh |
public class CountCache { 54WX#/<Yik
public static LinkedList list=new LinkedList(); K9 }Brhe
/** Creates a new instance of CountCache */ ]FvGAG.*
public CountCache() {} 9o?\*{'KT
public static void add(CountBean cb){ cotySio$
if(cb!=null){ )+,h}XqlX
list.add(cb); .C+(E@ey A
} #Q=c.AL{
} 2PeMt^
} SQ+r'g
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CountControl.java wRK27=\z
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/* qW4\t
* CountThread.java Q qj9o2
* :,$"Gk
* Created on 2007年1月1日, 下午4:57 %}~(%@qB>+
* T?Z&\g0yp
* To change this template, choose Tools | Options and locate the template under {=&({ cS
* the Source Creation and Management node. Right-click the template and choose sL\ {.ad5
* Open. You can then make changes to the template in the Source Editor. I!kR:Z
*/ "u$XEA
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package com.tot.count; tfm3IX
import tot.db.DBUtils; d>MDC
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import java.sql.*; (5+g:mSfr
/** /f oI.S
* W)o*$cu
* @author d2U?rw_
*/ ^ )!eiM
public class CountControl{ )ryP K"V
private static long lastExecuteTime=0;//上次更新时间 km^ZF<. @
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 jyyig%
/** Creates a new instance of CountThread */ Y1ca=ewFx
public CountControl() {} _):@C:6
public synchronized void executeUpdate(){ HFyQ$pbBU
Connection conn=null; G[_Z|Xi1
PreparedStatement ps=null;
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try{ }|M:MJ`
conn = DBUtils.getConnection(); DMp@B]>
conn.setAutoCommit(false); Ijz*wq\s;
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); g6.I~oQj
for(int i=0;i<CountCache.list.size();i++){ &IRM<A!8
CountBean cb=(CountBean)CountCache.list.getFirst(); c\ZnGI\|
CountCache.list.removeFirst(); MwQt/Qv=
ps.setInt(1, cb.getCountId()); D Vg$rm`
ps.executeUpdate();⑴ Q9f5}
//ps.addBatch();⑵ P&:[pPG
} ]WcN6|b+
//int [] counts = ps.executeBatch();⑶ B *6ncj
conn.commit(); @y * TVy
}catch(Exception e){ i<tJG{A=
e.printStackTrace(); H*f2fyC1\
} finally{ /S~ =qodS
try{ v&]yzl
if(ps!=null) { Gp)J[8j
ps.clearParameters(); ;qWSfCt/^
ps.close(); 3a ZS1]/
ps=null; Y2dml!QM
} &U}8@;
}catch(SQLException e){} cQBc6eAi
DBUtils.closeConnection(conn); nr}Ols
} N@!PhP
} BYa#<jXtAT
public long getLast(){ KPjAk
return lastExecuteTime; jk\V2x@DR
} VUHf-bKl
public void run(){ !V/7q'&t=
long now = System.currentTimeMillis(); N cGFPi(Z
if ((now - lastExecuteTime) > executeSep) { 15' fU!
//System.out.print("lastExecuteTime:"+lastExecuteTime); iAXGf V
//System.out.print(" now:"+now+"\n"); \"Z\Af<
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^\J-LU|"B
lastExecuteTime=now; +$2`"%nBG
executeUpdate(); G^dzE/:
} o>Dd1
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else{ xpwy%uo
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); g4 +Hq *
} SK 5]7C2
} W5:fY>7
} @qx$b~%
//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 rwgj]
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类写好了,下面是在JSP中如下调用。 A 2A_F|f
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<% h9iQn<lp4.
CountBean cb=new CountBean(); m@w469&<(q
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); FS!)KxC/-
CountCache.add(cb); b^ [ z'
out.print(CountCache.list.size()+"<br>"); 3=} P l,
CountControl c=new CountControl(); hk
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c.run(); UA]fKi
out.print(CountCache.list.size()+"<br>"); 2Yd@V}
%>