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: xBcE>^{1.
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CountBean.java ~lLIq!!\
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/* G_x<2E"d
* CountData.java nz]+G2h
* 6ax|EMw
* Created on 2007年1月1日, 下午4:44 vvG#O[| O
* *]
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* To change this template, choose Tools | Options and locate the template under rfMzHY}%
* the Source Creation and Management node. Right-click the template and choose /e}NZo{)g
* Open. You can then make changes to the template in the Source Editor. {o[*S%Z"
*/ Dx27 s
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package com.tot.count; i/UHDqZ
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/** &<sDbNS
* j!P]xl0vOZ
* @author H6XlSj
*/ )W/mt[;
public class CountBean { V"@]PI pr
private String countType; #4*~ 4/
int countId; vN%SN>=L<
/** Creates a new instance of CountData */ (-(sBQ a+
public CountBean() {} #Hr>KQ5mJQ
public void setCountType(String countTypes){ ZK@ENfG
this.countType=countTypes; H?>R#Ds-
} !7-dqw%l
public void setCountId(int countIds){ ?8Hr
9
this.countId=countIds; !8U\GR `
} .pOTIRbA
public String getCountType(){ ^i^/d#
return countType; 0Y9\,y_
} *1KrI9i
public int getCountId(){ XaV h.
return countId; bgjo_!J+Pp
} /r Hd9^Y
} Hb;#aXHSd
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CountCache.java jdGoPa\
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/* +idj,J|
* CountCache.java *s9
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* s^b2H
!~
* Created on 2007年1月1日, 下午5:01 /gKX%`ZF/r
* zR+EJFf
* To change this template, choose Tools | Options and locate the template under $!x8XpR8s
* the Source Creation and Management node. Right-click the template and choose x\Bl^1&
* Open. You can then make changes to the template in the Source Editor. q(J3fjY)
*/ nDSmr
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package com.tot.count; 0BM3:]=wr
import java.util.*; H1>}E5^?
/** ~ b;%J:
* v'*#P7%Kf
* @author g,!6,v@
*/ eFUJASc
public class CountCache { eEIa=MB*
public static LinkedList list=new LinkedList(); d3AOuVUf
/** Creates a new instance of CountCache */ !K#Q[Ee
public CountCache() {} Q0I22?
public static void add(CountBean cb){ d([NU;
if(cb!=null){ 8=H!&+aGh
list.add(cb); Yqy7__vm
} 2Ke?*
} +.T&U7xV
} f YR*B0tu
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CountControl.java `Li3=!V[
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/* {(i>$RG_
* CountThread.java +v3@WdLcD
* :e5)Q=lX
* Created on 2007年1月1日, 下午4:57 N*N@wJy:5
* @JS O=8
* To change this template, choose Tools | Options and locate the template under W~J@v@..4
* the Source Creation and Management node. Right-click the template and choose ON|Bpt2Qp
* Open. You can then make changes to the template in the Source Editor. A=/|f$s+
*/ vlAYKtl3]
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package com.tot.count; 0 V:z(r
import tot.db.DBUtils; V^WR(Q}
import java.sql.*; TpLlbsd
/** -9)<[>:
* F'DO46
* @author X|)Ox
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*/
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public class CountControl{ z^to"j
private static long lastExecuteTime=0;//上次更新时间 GpV"KVJJ/
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Y#EM]x5!=
/** Creates a new instance of CountThread */ y,i:BQJ<
public CountControl() {} }u0t i"V
public synchronized void executeUpdate(){ {%ZD^YSA
Connection conn=null; }UK<tUO
PreparedStatement ps=null; &y/
try{ lV/-jkR
conn = DBUtils.getConnection(); 6C>"H
conn.setAutoCommit(false); #y }{ 'rF?
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); |-l)$i@
for(int i=0;i<CountCache.list.size();i++){ %Ji@\|Zkf
CountBean cb=(CountBean)CountCache.list.getFirst(); 7KOM,FWKe
CountCache.list.removeFirst(); p9ligs7V'
ps.setInt(1, cb.getCountId()); ?'_E$
ps.executeUpdate();⑴ !N- -
//ps.addBatch();⑵ &)@|WLW
} AOhfQ:E 4
//int [] counts = ps.executeBatch();⑶ $IzhaX
conn.commit(); oqa]iBO
}catch(Exception e){ `x2Q:&.H`
e.printStackTrace(); Q%61_l
} finally{ <\<[J0
try{ u6{=Z :
if(ps!=null) { ,*SoV~
ps.clearParameters(); [hE0 9W
ps.close(); kGsd3t!'
ps=null; ,C%fA>?UF8
} hm"i\JZ3N
}catch(SQLException e){} Z<6XB{Nh\
DBUtils.closeConnection(conn); OTs vox|(
} pBV_'A}ioh
} @Omgk=6
public long getLast(){ ;v0M
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return lastExecuteTime; pJ Iq`)p5
} M8oCh
public void run(){ 8.4 1EKr2
long now = System.currentTimeMillis(); J0@<6~V6o
if ((now - lastExecuteTime) > executeSep) { d?G~k[C!a
//System.out.print("lastExecuteTime:"+lastExecuteTime); #?/&H;n_8S
//System.out.print(" now:"+now+"\n"); [EUp4%Z #
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); fG2hCP+
lastExecuteTime=now; B2\R#&X.
executeUpdate(); a[;TUc^I1F
} MYgh^%w:
else{ 5 Z+2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
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} bjvpYZC\5
} ^sz4-+>
} B]Vnu7
//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 ?}4 =A&][
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类写好了,下面是在JSP中如下调用。 ag Za+a
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<% /XtpGk_1)
CountBean cb=new CountBean(); $e66j V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); n#,<-Rb-
CountCache.add(cb); =SJwCT0;
out.print(CountCache.list.size()+"<br>"); QJ2V&t"3
CountControl c=new CountControl(); j{00iA}
c.run(); !;'#fxW[
out.print(CountCache.list.size()+"<br>"); >*#clf;@p
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