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: KFQ 4vavNh
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CountBean.java ;Z>u]uK4+
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/* 7>
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* CountData.java <[iw1>
* *Iy5 V7`KU
* Created on 2007年1月1日, 下午4:44 ,liFo.kT8%
* w_zUA'n+
* To change this template, choose Tools | Options and locate the template under v
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* the Source Creation and Management node. Right-click the template and choose iA*^`NMaT
* Open. You can then make changes to the template in the Source Editor. ^na8d's:
*/ ]?KTw8j}
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package com.tot.count; _cPGS=Ew
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/** 2"0q9 Jg
* }E[u" @}
* @author EFpV
*/ $ZnLY uGb
public class CountBean { Pn?Ujjv
private String countType; \3nu &8d
int countId; Kf=6l#J7
/** Creates a new instance of CountData */ RNa59b
public CountBean() {} (41BUX
public void setCountType(String countTypes){ GD*rTtDWn
this.countType=countTypes; ]M^k~Xa
} G@$Y6To[
public void setCountId(int countIds){ bogw /)1
this.countId=countIds; iYbp^iVg
} NMaZ+g!t(
public String getCountType(){ %Xe#'qNq)
return countType; 73/DOF
} $y%X#:eLJ
public int getCountId(){ }5_[t9LX
return countId; t2bv
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} }~B @Z\`O
} h?t#ABsVK
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CountCache.java ]0[Gc
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/* FKYPkFB
* CountCache.java +Cs[]~
* KMs[/|HX\
* Created on 2007年1月1日, 下午5:01 #kGgzO
* #eRrVjbo
* To change this template, choose Tools | Options and locate the template under |l \!
* the Source Creation and Management node. Right-click the template and choose WG~|sLg
* Open. You can then make changes to the template in the Source Editor. V$ 8go#5
*/ P:lmQHls+
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package com.tot.count; _xKu EU}
import java.util.*; =7^rKrD
/** 4o/}KUu(*
* g5",jTn#
* @author vR`#kxSdJ@
*/ Go^a~Sf$
public class CountCache { :? uUh
public static LinkedList list=new LinkedList(); [N@t/^gRC
/** Creates a new instance of CountCache */ " a&|{bv
public CountCache() {} gu1:%raXd
public static void add(CountBean cb){ WFr;z*
if(cb!=null){ ,\){-H/n
list.add(cb); \,n|V3#G
} T[?wbYfW
} Uz4!O
} ~wejy3|@0
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CountControl.java )GT*HJR(vc
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/* .Iu8bN(L`
* CountThread.java 9\dpJ\
* R #f*QXv
* Created on 2007年1月1日, 下午4:57 n'?AZ4&z
* 9N+3S2sBx&
* To change this template, choose Tools | Options and locate the template under =D>,s)}o3;
* the Source Creation and Management node. Right-click the template and choose QD8.C=2R
* Open. You can then make changes to the template in the Source Editor. Uzi.CYVs%
*/ ol[sX=5 *
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package com.tot.count; o"kVA;5<G
import tot.db.DBUtils; 96(3ilAt
import java.sql.*; g3 6:OK"
/** cVV @MC
* %#_"Ie
* @author Pv#Oea?
*/ (&Kv]--
public class CountControl{ m{v*\e7P
private static long lastExecuteTime=0;//上次更新时间 5SB!)F]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 R^p'gQc$
/** Creates a new instance of CountThread */ \X*Es.;|x
public CountControl() {} mRurGaR
public synchronized void executeUpdate(){ 'VMov
Connection conn=null; dCb7sqJ%
PreparedStatement ps=null; ;c/|LXc\
try{ f]_{4Olk
conn = DBUtils.getConnection(); =%)Y,
)"
conn.setAutoCommit(false); =~D QX\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 5n0B`A
for(int i=0;i<CountCache.list.size();i++){ icrcP ~$A
CountBean cb=(CountBean)CountCache.list.getFirst(); u?Uu>9@Z
CountCache.list.removeFirst(); )X2/_3
ps.setInt(1, cb.getCountId()); jW8,}Xs
ps.executeUpdate();⑴ ,J$XVvwxF
//ps.addBatch();⑵ **G5fS.^W
} `iQ])C^d
//int [] counts = ps.executeBatch();⑶ B,5kG{2!
conn.commit(); \PzJ66DL!
}catch(Exception e){ *HONA>u
e.printStackTrace(); UR|Au'iu
} finally{ F HK{cE
try{ A3uF 0A
if(ps!=null) { hEh` cBO
ps.clearParameters(); %&5PZmnW
ps.close(); /g]NC?
ps=null; K\trT!I
} !,cLc}a
}catch(SQLException e){} 6"L,#aKm^
DBUtils.closeConnection(conn); "*bP @W
} o#Viz:
} u]z87#4
public long getLast(){ w paI}H#
return lastExecuteTime; sU$<v( `"
} #iiXJnG
public void run(){ M*-]<!))7
long now = System.currentTimeMillis(); +:_;K_h
if ((now - lastExecuteTime) > executeSep) { KXiStwS
//System.out.print("lastExecuteTime:"+lastExecuteTime); 1a]P+-@u[
//System.out.print(" now:"+now+"\n"); J*Q+$Ai~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); %Q080Ltet
lastExecuteTime=now; ?8/T#ox
executeUpdate(); hh[@q*C
} @kPe/j/[1
else{ fq[1 |Q
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 1xD?cA\vu
} K%g_e*"$
} H[Q3M~_E
} cakwGs_{
//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 *%ta5a
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类写好了,下面是在JSP中如下调用。 M{jJ>S{g
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<% $vLGX>H
CountBean cb=new CountBean(); Pr_DMu
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); .Cu0G1
CountCache.add(cb); u*m|o8
out.print(CountCache.list.size()+"<br>"); =x@v{cP
CountControl c=new CountControl(); m7|S'{+!
c.run(); +Ym#!"
out.print(CountCache.list.size()+"<br>"); E*vh<C
%>