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: Qk:Lo*!
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CountBean.java n jWe^
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/* W&*&O,c
* CountData.java z{
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* 'R79,)|;[
* Created on 2007年1月1日, 下午4:44 :xPo*#[Z(A
* "mW'tm1+
* To change this template, choose Tools | Options and locate the template under oNAnJ+_
* the Source Creation and Management node. Right-click the template and choose igfQ,LWe!
* Open. You can then make changes to the template in the Source Editor. |(z{)yWbC[
*/ ]=qauf>3
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package com.tot.count; &sWr)>vs
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/** !%,7*F(
* )N&SrzqTK
* @author LJGpa )(
*/ 9kH~=`: ?
public class CountBean { u^tQ2&?O!P
private String countType; Ig`q[o
int countId; -[L\:'Gp5
/** Creates a new instance of CountData */ tF`L]1r>
public CountBean() {} /'rj L<M
public void setCountType(String countTypes){ 'F/oR/4,
this.countType=countTypes; v'@gUgC
} _xaum
public void setCountId(int countIds){ {r&mNbz
this.countId=countIds; 6:#o0OeBP
} WMf /
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public String getCountType(){ (@+pz/
return countType; t<p#u=jOa
} z3tx]Ade
public int getCountId(){ 6(bN*.
return countId; Fvl\.
} K$,Zg
} )t|:_Z
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CountCache.java 1'E=R0`pA
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/* w*VN=
* CountCache.java *OG<+#*\_?
* NZB*;U~t
* Created on 2007年1月1日, 下午5:01 /grTOf&
* f,TW|Y'{g
* To change this template, choose Tools | Options and locate the template under sN[}B{+
* the Source Creation and Management node. Right-click the template and choose Ay?<~)H
* Open. You can then make changes to the template in the Source Editor. ^Spu/55_
*/ L3, /7
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package com.tot.count; F]
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import java.util.*; '@t$3
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/** */;7Uv7
* _`udd)Y2
* @author >&PM'k
*/ jq,M1
public class CountCache { VhUWws3E
public static LinkedList list=new LinkedList(); m^3x%ENZ
/** Creates a new instance of CountCache */ \)~d,M}kK
public CountCache() {} el9P@r0
public static void add(CountBean cb){ mAW.p=;
if(cb!=null){ r N$0qo
list.add(cb); g-sNYd%?a
} /4an@5.\C
} p3=Py7iz
} v1OVrk>s>
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CountControl.java Ss>pNH@c
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/* &>JP.//spi
* CountThread.java oP`l)`
* GTP'js
* Created on 2007年1月1日, 下午4:57 6'Q{xJe?
* b)d;eS
* To change this template, choose Tools | Options and locate the template under BDI|z/~&
* the Source Creation and Management node. Right-click the template and choose [H}>
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* Open. You can then make changes to the template in the Source Editor. zZ=SAjT QP
*/ :<J7 g`f
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package com.tot.count;
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import tot.db.DBUtils; ~Gu$EqQ
import java.sql.*; fqgp{(`@>
/** 6gV*G
* #r'MfTr
* @author >(Y CZ
*/ <YaT r9%w
public class CountControl{ su%(!XJQpg
private static long lastExecuteTime=0;//上次更新时间 Z2g'&,uc#
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 |.N[NY
/** Creates a new instance of CountThread */ Bh3F4k2bg7
public CountControl() {} }>@\I^Xm,
public synchronized void executeUpdate(){ !Km[Qw
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Connection conn=null; ?})A-$f ~
PreparedStatement ps=null; i>Q!5
try{ !D??Y^6bI
conn = DBUtils.getConnection(); Nz
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conn.setAutoCommit(false); ukiWNF/
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); /$c87\
for(int i=0;i<CountCache.list.size();i++){ EF`}*7)
CountBean cb=(CountBean)CountCache.list.getFirst(); u} ot-!}Q
CountCache.list.removeFirst(); 0g?)j-
ps.setInt(1, cb.getCountId()); ) D@j6r
ps.executeUpdate();⑴ +{:uPY#1
//ps.addBatch();⑵ U^dfNi@q
} *[[Gu^t^!
//int [] counts = ps.executeBatch();⑶ d0(zB5'}
conn.commit(); E4X6f
}catch(Exception e){ LikcW#
e.printStackTrace(); @2>UR9j
} finally{ F/oqYk9`
try{
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if(ps!=null) { b84l`J
ps.clearParameters(); 2%%\jlT_
ps.close(); =]7o+L4
ps=null; [dJ!JT/X{
} ALMsF2H
}catch(SQLException e){} o2!738
DBUtils.closeConnection(conn); K<>kT4
} e5'I W__
} h4;kjr}h}
public long getLast(){ HRf;bKZ
return lastExecuteTime; FNQ<k[#K'~
} ,2FK$:M\
public void run(){ MAek856
long now = System.currentTimeMillis(); o "VKAP
if ((now - lastExecuteTime) > executeSep) { |}=eY?iXo
//System.out.print("lastExecuteTime:"+lastExecuteTime); "_WN[jm
//System.out.print(" now:"+now+"\n"); #3&@FzD_P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); _S r}3
lastExecuteTime=now; Geq]wv8
executeUpdate(); l2
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} : K|
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else{ 'PF>#X''
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); m}"Hm(,6
} eEZgG=s
} f$lb.fy5
} ?bZH Aed
//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 ?NMk|+
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类写好了,下面是在JSP中如下调用。 xC`!uPk/pL
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<% :iE b^F}
CountBean cb=new CountBean(); `ASDUgx Mq
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); J K/{IkF
CountCache.add(cb); 6K.2VY#
out.print(CountCache.list.size()+"<br>"); As,`($=
CountControl c=new CountControl(); 6v)TCj/
c.run(); fL*7u\m:
out.print(CountCache.list.size()+"<br>"); N5?bflY
%>