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: Z/ThYbk
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CountBean.java 'l<kY\I!%
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/* F]YPq
* CountData.java VSP[G ,J.
* 3-_4p8OK
* Created on 2007年1月1日, 下午4:44 kW/ksz0)
* $]%k
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* To change this template, choose Tools | Options and locate the template under Wje7fv
* the Source Creation and Management node. Right-click the template and choose /?by4v73P
* Open. You can then make changes to the template in the Source Editor. A
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*/ 3HfT9
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package com.tot.count; Y3-15:-
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/** n}._Nb
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* (r7~ccy4
* @author cLB"<mG
*/ $x`U)pv
public class CountBean { XvdK;
private String countType; g=Qj9Z
int countId; '9RHwKu&s
/** Creates a new instance of CountData */ K,^b=_]
public CountBean() {} I@x*>
public void setCountType(String countTypes){ xi|iV1A
this.countType=countTypes; E%$FX'8&
} LTJ|EXYA
public void setCountId(int countIds){ l?#([(WM
this.countId=countIds; _s=[z$EN&
} iF`E>%#
public String getCountType(){ 'RG`DzuF
return countType; 3 #jPQ[+
} "h)+fAT|,
public int getCountId(){ JbG+ysn
return countId; [%bshaY:
} gE8>5_R|
} vO"AJ`_
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CountCache.java b},OCVT?
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/* i@d!g"tot
* CountCache.java zJ@f {RWZa
* lYq
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* Created on 2007年1月1日, 下午5:01 "_5av!;A
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* BeplS
* To change this template, choose Tools | Options and locate the template under 1L^\TC
* the Source Creation and Management node. Right-click the template and choose ,"*[T\u
* Open. You can then make changes to the template in the Source Editor. N!btj,vx
*/ &;C|=8eB
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package com.tot.count; ;1F3.ibE
import java.util.*; Ba@UX(t
/** m2\ZnC
* !5p01]7
* @author k.0$~juu
*/ BeP0lZ
public class CountCache { !f"@pR6
public static LinkedList list=new LinkedList(); o<%Sr*
/** Creates a new instance of CountCache */ R#Ss_y
public CountCache() {} F5EKWP
public static void add(CountBean cb){ b/2t@VlL
if(cb!=null){ _D
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list.add(cb); q?\3m3GM
} y'Wz*}8pr
} !&! sn"yD
} (8{h I
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CountControl.java 4UG7{[!+
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/* Fet>KacTht
* CountThread.java o2Z#
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*
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* Created on 2007年1月1日, 下午4:57 m-ZVl j
* fq\E$'o$
* To change this template, choose Tools | Options and locate the template under $g#%
* the Source Creation and Management node. Right-click the template and choose Soq
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* Open. You can then make changes to the template in the Source Editor. oSTGs@EK
*/ h5B'w
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package com.tot.count; yPuT%H&i
import tot.db.DBUtils; 3<?(1kSo>>
import java.sql.*; 3O$Q>.0 w/
/** l$.C40v
* .PxtcC.K
* @author @YV-8;hO
*/ 7FfzMs[\e
public class CountControl{ /z~;.jRg
private static long lastExecuteTime=0;//上次更新时间 }0qgvw
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Q- j+#NGc
/** Creates a new instance of CountThread */ V"\t
public CountControl() {} >'E'Mp.
public synchronized void executeUpdate(){ Z\`uI+`
Connection conn=null; !a4pKN`qLY
PreparedStatement ps=null; dt;R
try{ q[**i[+%
conn = DBUtils.getConnection(); P62g7>B5^
conn.setAutoCommit(false); Q>= :$I
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); i!sKL%z}
for(int i=0;i<CountCache.list.size();i++){ u9sffX5x[J
CountBean cb=(CountBean)CountCache.list.getFirst(); o'r?^ *W
CountCache.list.removeFirst(); -*+7-9A I
ps.setInt(1, cb.getCountId()); mWCY%o@
ps.executeUpdate();⑴ q[7C,o>/
//ps.addBatch();⑵ X_O(j!h
} 1j3mTP
//int [] counts = ps.executeBatch();⑶ v(]\o;/O
conn.commit(); XeJx/'9o{
}catch(Exception e){ "J7=3$CA
e.printStackTrace(); l.Qj?G
} finally{ YzsHec
try{ So,EPB+
if(ps!=null) { 7$}lkL
ps.clearParameters(); #t
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ps.close(); W
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ps=null; AfFFu\
} aJK8G,Vk
}catch(SQLException e){} WXaLKiA*(
DBUtils.closeConnection(conn); M)(
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} {N/(lB8
} O~l WFaW
public long getLast(){ f*LDrAf9
return lastExecuteTime; ,7z.%g3+z
} bp;b;f>
public void run(){ eBBqF!WDb
long now = System.currentTimeMillis(); mp>,TOi~s7
if ((now - lastExecuteTime) > executeSep) { qAHQZKk
//System.out.print("lastExecuteTime:"+lastExecuteTime); >t 3%-Kc
//System.out.print(" now:"+now+"\n"); 0x[v)k9"0
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Rw=gg>\
lastExecuteTime=now; fg^$F9@
executeUpdate(); ~Wf&$p<|
} VuPa'2
else{ 34&n{ xv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); @=isN'>] O
} |^8l8u
} #4DEb<D
} }e&
//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 d
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#-Ehg4W
类写好了,下面是在JSP中如下调用。 +t,JCY6
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<% yM=%a3
CountBean cb=new CountBean(); }&bO;o&>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Y Dq5%N`
CountCache.add(cb); I?EtU/AD
out.print(CountCache.list.size()+"<br>"); Pur~Rz\\
CountControl c=new CountControl(); OZB(4{vnyC
c.run(); )zf&`T
out.print(CountCache.list.size()+"<br>"); h/mmV:v
%>