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: Uq=Rz8hLM
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CountBean.java d*!H&1L
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/* =PU@'OG
* CountData.java wV-N\5!r%H
* ?,v@H$)3_
* Created on 2007年1月1日, 下午4:44 X:FyNUa
* ;J?fK69%
* To change this template, choose Tools | Options and locate the template under ^=I[uX-3ue
* the Source Creation and Management node. Right-click the template and choose r?`nc6$0|
* Open. You can then make changes to the template in the Source Editor. zv1,DnkqF
*/ $IKN7
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package com.tot.count; uA?a
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/** C#&b`
* w6 Y+Y;,'f
* @author 8}z PDs
*/ YU87l
public class CountBean { M/[9ZgDc
private String countType; xZAg
int countId; q9(O=7O]-
/** Creates a new instance of CountData */ E?0RR'
public CountBean() {} Nf~B 1vkp
public void setCountType(String countTypes){ !/F-EJOH6C
this.countType=countTypes; b9f5
} 11J:>A5zt
public void setCountId(int countIds){ oOQan
this.countId=countIds; }WQ:Rmi
} $~EY:
public String getCountType(){ .GnoK?
return countType; 3,+UsB%
} .<P@6Jq
public int getCountId(){ esTK4z]
return countId; e?aSM
} I1ibrn
} yC}x6xG
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CountCache.java B*Q.EKD8s
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/* i;)r|L`V?
* CountCache.java u<@
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* V6<Ki
* Created on 2007年1月1日, 下午5:01 !OH'pC5
* kr
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* To change this template, choose Tools | Options and locate the template under qyzeAK\Ia
* the Source Creation and Management node. Right-click the template and choose zHj_q%A
* Open. You can then make changes to the template in the Source Editor. KrECAc
*/ @0:mP
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package com.tot.count; Z*5]qh2r8
import java.util.*; z:$TW{%M
/** I8hmn@ce
* *u<@_Oa
* @author "jl`FAu)q
*/ 3TD!3p8
public class CountCache { E<_+Tc
public static LinkedList list=new LinkedList(); !I8(Y
/** Creates a new instance of CountCache */ r,Pu-bhF
public CountCache() {} _`94CC:
public static void add(CountBean cb){ {QLqf
if(cb!=null){ )3_g&&
list.add(cb); gtP;Qw'
} PJcz] <
} #`Et{6WS
} \=g%W^i
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CountControl.java 7W#9ki1
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/* ]| =#FFz
* CountThread.java v3jx2Z
* =HvLuVc
* Created on 2007年1月1日, 下午4:57 F9SIC7}uH
* j#XU\G
* To change this template, choose Tools | Options and locate the template under 4VL]v9
* the Source Creation and Management node. Right-click the template and choose {Q~A;t
* Open. You can then make changes to the template in the Source Editor. }%-`CJ,
*/ 4fzM%ku
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package com.tot.count; $VJ=A<
import tot.db.DBUtils; >^Z!
import java.sql.*; ph1veD<ZZ
/** ? Kn~fs8
* 0r\hX6 k
* @author Ol@
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*/ \+w -{"u$
public class CountControl{ K31rt-IIt
private static long lastExecuteTime=0;//上次更新时间 aKCXV[PO
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I1(,J
/** Creates a new instance of CountThread */ SY2B\TV
public CountControl() {} 8:A6Ew&\]O
public synchronized void executeUpdate(){ mY1$N}8fm
Connection conn=null; 2?7a\s
PreparedStatement ps=null; C44Dz.rs
try{ l>9ZAI\^
conn = DBUtils.getConnection();
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conn.setAutoCommit(false); P3YG:*
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); bsmnh_YRj
for(int i=0;i<CountCache.list.size();i++){ 5k}UXRB?
CountBean cb=(CountBean)CountCache.list.getFirst(); o' DXd[y
CountCache.list.removeFirst(); W,>;`>
ps.setInt(1, cb.getCountId()); ',*
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ps.executeUpdate();⑴ %lPFq-
//ps.addBatch();⑵ {Z|.-~W
} s.I=H^T
//int [] counts = ps.executeBatch();⑶ |3g:q
conn.commit(); C31SXQ
}catch(Exception e){ 1<qq6 9x
e.printStackTrace(); 7<?v!vQ}-
} finally{ Hca)5$yL
try{ jKu"Vi|j>
if(ps!=null) { >b/0i$8
ps.clearParameters(); L*VGdZ
ps.close(); ;z7iUke0%
ps=null; DI!l.w5P_
} 9W7H",wR
}catch(SQLException e){} B)"WG7W E
DBUtils.closeConnection(conn); gGdZ}9
} S*CRVs
} Kc\0-3 Z
public long getLast(){ G\IH
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return lastExecuteTime; W"WvkW>-
} )5X7|*LP
public void run(){
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long now = System.currentTimeMillis(); g;bkVq
if ((now - lastExecuteTime) > executeSep) { 4S.%y7d\
//System.out.print("lastExecuteTime:"+lastExecuteTime); NzRL(A6V
//System.out.print(" now:"+now+"\n"); rReZ$U
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); y?aOk-TaRA
lastExecuteTime=now; v *~ yN*
executeUpdate(); W#0pFofXw
} :h3
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else{ VxfFk4
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); GYv2^IB:
} !=0N38wA
} x<=+RYz#^:
} JX/rAnc@
//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 Md_\9G .e
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类写好了,下面是在JSP中如下调用。 G#CWl),=
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<% 7IZ(3B<87t
CountBean cb=new CountBean(); q^dI!93n|
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 4- 6'
CountCache.add(cb); )r1Z}X(#d
out.print(CountCache.list.size()+"<br>"); 2&!G@5
CountControl c=new CountControl(); !cE)LG
c.run(); F{f "xM
out.print(CountCache.list.size()+"<br>"); E(
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