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: <(V~eo
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CountBean.java $xF[j9nM
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/* @ `mke4>_
* CountData.java e~cg
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* VWzuV&;P
* Created on 2007年1月1日, 下午4:44 b):aqRwP
* qZv@ULluc
* To change this template, choose Tools | Options and locate the template under Kltqe5
* the Source Creation and Management node. Right-click the template and choose Wt=@6w&
* Open. You can then make changes to the template in the Source Editor. v"o@q2f_
*/ 3preBs#i
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package com.tot.count; >ffC?5+
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/** *X}2
* s#")hMJQ
* @author D(&WEmm\B
*/ |`V=hqe{
public class CountBean { !$!%era`
private String countType; iM6(bmc.
int countId; b*{UO
/** Creates a new instance of CountData */ $jv"$0Fc
public CountBean() {} %Nob B
public void setCountType(String countTypes){ WN#2<XjG
this.countType=countTypes; ya,-Lt
} h^''ue"
public void setCountId(int countIds){ UN:qE oS
this.countId=countIds; '*
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} y7GgTC/H
public String getCountType(){ B?y[ %i
return countType; 'T3xZ?*q=
} eV}H
public int getCountId(){ 6\-u:dvGI?
return countId; dy'lM ;@-
} w|*D{`O
} {LCKt/Z>P
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CountCache.java N%1nii
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/* x\VP
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* CountCache.java bka%W@Y%
* Fdq5:v?k
* Created on 2007年1月1日, 下午5:01 !C^>tmqS
* IR;3{o
* To change this template, choose Tools | Options and locate the template under *&R|0I{>
* the Source Creation and Management node. Right-click the template and choose V)ag ss w?
* Open. You can then make changes to the template in the Source Editor. v$5D&Tv
*/ { 9\/aXPS
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package com.tot.count; ^uVPN1}b^@
import java.util.*; b^P\Q s*m
/** H\9ePo\b~
* P_75-0G
* @author mQ:YHtHE.F
*/ a$bE2'cb
public class CountCache { +kD JZ
public static LinkedList list=new LinkedList(); +>$Kmy[3
/** Creates a new instance of CountCache */ s'IB{lJ9
public CountCache() {} l
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public static void add(CountBean cb){ kf9]nIo
if(cb!=null){ imhE=6{
list.add(cb); {G<1.
} [qkc6sqo
} -9o7a_Z
} +RkXe;q
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CountControl.java Pt-O1$C[
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/* wqJl[~O$
* CountThread.java iWW
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* /WK1( B:
* Created on 2007年1月1日, 下午4:57 UQ@szE
* &0J8ICd=
* To change this template, choose Tools | Options and locate the template under 3v `@**
* the Source Creation and Management node. Right-click the template and choose E]r<t#
* Open. You can then make changes to the template in the Source Editor. KDA2
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*/ qG g2 9
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package com.tot.count; n1PvZ~^3
import tot.db.DBUtils; yw89*:A6
import java.sql.*; *m`x/_y+
/** M
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* lk
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* @author |_ U!i
*/ W%o! m,zFM
public class CountControl{ A0v@L6m-O
private static long lastExecuteTime=0;//上次更新时间 *Gj`1#Z$
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ag8lI+
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/** Creates a new instance of CountThread */ 1Y~'U
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public CountControl() {} 8|5+\1!#/)
public synchronized void executeUpdate(){ 6Lg#co}9
Connection conn=null; C#3&,G W
PreparedStatement ps=null; 0V`~z-#
try{ F|o1r
conn = DBUtils.getConnection(); NdXC8
conn.setAutoCommit(false); R9QW%!:,\2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); d5R2J:dI
for(int i=0;i<CountCache.list.size();i++){ h%v qt~0
CountBean cb=(CountBean)CountCache.list.getFirst(); mC?}:WM@
CountCache.list.removeFirst(); L;+e)I]
ps.setInt(1, cb.getCountId()); CUBL/U\=
ps.executeUpdate();⑴ +[$Td%6
//ps.addBatch();⑵ jyidNPLm4
} w"O;: `|n
//int [] counts = ps.executeBatch();⑶ ;M\Cw.%![
conn.commit(); 5Kk}sxol
}catch(Exception e){ N$.ls48a4-
e.printStackTrace(); 7;]IlR6
} finally{ `Ao"fRv#
try{ +$/NTUOP
if(ps!=null) { L6ypn)l
ps.clearParameters(); cFuQ>xR1
ps.close(); zN-Y=-c
ps=null; mS0;2xU
} ;<xPzf
}catch(SQLException e){} 7_rDNK@e
DBUtils.closeConnection(conn); u
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} .SOCWznb
} |W&K@g$
public long getLast(){ =GeGlI6
return lastExecuteTime; z=8l@&hYLq
} ~*Y/#kPY
public void run(){ !<b+7A
long now = System.currentTimeMillis(); O-P`HKr
if ((now - lastExecuteTime) > executeSep) { Ln/*lLIOb
//System.out.print("lastExecuteTime:"+lastExecuteTime); oU*e=uehj
//System.out.print(" now:"+now+"\n"); v3kT~uv
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); M*~X pT3
lastExecuteTime=now; 7; ?7q
executeUpdate(); f3:dn7
} ]5MT-qU
else{ u9]M3>
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Mt%Q5^
} I7t}$S6
} Lw?>1rTT/
} _p9 _P g8
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 &._Mh
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类写好了,下面是在JSP中如下调用。 <xH!
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<% v`:!$U*
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CountBean cb=new CountBean(); ;$qc@)Uwp
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); AU9:Gu@M/
CountCache.add(cb); '[HU!8F
out.print(CountCache.list.size()+"<br>"); H$
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CountControl c=new CountControl(); (dV7N
c.run(); * )HVK&