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: }_S]!AWz
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CountBean.java &^"m6
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/* k 'o?/
* CountData.java `Bx CTwc
* 4R.#=]F
* Created on 2007年1月1日, 下午4:44 )!Bv8&;e
* kK(,FB
* To change this template, choose Tools | Options and locate the template under e):
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* the Source Creation and Management node. Right-click the template and choose xK f+.6 wz
* Open. You can then make changes to the template in the Source Editor. gw-l]@;1
*/ _~r>C
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package com.tot.count; b@k3y9&
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/** ( Qnn
* BQ(`MM@
* @author (,k=mF
*/ ?V+=uTCq
public class CountBean { q>?oV(sF
private String countType; :'03*A_[
int countId; JL1Whf
/** Creates a new instance of CountData */ M~v{\!S
public CountBean() {} d] {^
public void setCountType(String countTypes){ N6eY-`4y
this.countType=countTypes; Ngr7E
} D<:9pLD(
public void setCountId(int countIds){ >:.Bn 8-
this.countId=countIds; 3s+D
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} :?zOL w?(
public String getCountType(){ 1*s Lj#
return countType; @d)6LA9Ec
} D0~mu{;c$
public int getCountId(){ I2b[
return countId; N9hBGa$
} D n^RZLRhy
} 9
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CountCache.java 9ItsK
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/* fz%urbJR
* CountCache.java :jA~zHO
* y37@4p^@9
* Created on 2007年1月1日, 下午5:01 eD(#zfP/+
* #R &F
* To change this template, choose Tools | Options and locate the template under %',.
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* the Source Creation and Management node. Right-click the template and choose ~FJd{$2x`
* Open. You can then make changes to the template in the Source Editor. u(P
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*/ ,JR7N_"I
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package com.tot.count; 2`x[y?Tn
import java.util.*; TB9ukLG^<<
/** NVQIRQ.
* r__uPyIMG/
* @author =2<
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*/ 75a3H`
public class CountCache { h_J'dJS
public static LinkedList list=new LinkedList(); ,+f'%)s_x
/** Creates a new instance of CountCache */ KV Mm<]Z
public CountCache() {} EBJaFz'
public static void add(CountBean cb){ y5>H>NS
if(cb!=null){ *9G;n!t
list.add(cb); s iC/k*
} 9R!.U\sq
} 0nC%tCV'
} cxVnlgq1
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CountControl.java jZ)1]Q2
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/* d+l@hgz~
* CountThread.java ]R(=)
* f"S^:F0
* Created on 2007年1月1日, 下午4:57 [H!V
* m)&2zV/Q
* To change this template, choose Tools | Options and locate the template under wj5{f5 RWV
* the Source Creation and Management node. Right-click the template and choose S?&ntUah
* Open. You can then make changes to the template in the Source Editor. uSH.c>
*/ (JOge~U
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package com.tot.count; qWdL|8
import tot.db.DBUtils; mI-$4st]
import java.sql.*; -(P"+g3T
/** E`BL3+k Q
* ><%z~s
* @author )jvYJ9s
*/ *?cE]U6;
public class CountControl{ .:E%cL
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private static long lastExecuteTime=0;//上次更新时间 cl[rgj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 zl$'W=[rFs
/** Creates a new instance of CountThread */ M,zUg_ @
public CountControl() {} cZi/bIh
public synchronized void executeUpdate(){ dG\dGSZ\h
Connection conn=null; "4C b dD//
PreparedStatement ps=null; 40+~;20
try{ (k4> I"x)
conn = DBUtils.getConnection(); ;BsyN[bF
conn.setAutoCommit(false); }Til $TT%H
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); x ^&D8&4^
for(int i=0;i<CountCache.list.size();i++){ R]H/Jv\'
CountBean cb=(CountBean)CountCache.list.getFirst(); v="i0lL_
CountCache.list.removeFirst(); N"Q-xK
ps.setInt(1, cb.getCountId()); s'RE~,
ps.executeUpdate();⑴ XX+%:,G
//ps.addBatch();⑵ KFx4"f%
} "{Lp'+wNw
//int [] counts = ps.executeBatch();⑶ X)P9f N~7
conn.commit(); qf#Ou
}catch(Exception e){ pKMy:j
e.printStackTrace(); P`0}( '"U
} finally{ @uXF(KDX
try{ >La!O~d
if(ps!=null) { 1?\G6T
ps.clearParameters(); )cxLpTr
ps.close(); K_;'-B
ps=null; Jsde+G,N
} +/E`u|%|\]
}catch(SQLException e){} 1%g%I8W%
DBUtils.closeConnection(conn); 0e-M 24,C
} 7M9Ey29f
} 'GcN9D
public long getLast(){ 6B'd]Fe
return lastExecuteTime; [,JUC<
} yy8h8{=g
public void run(){ ei%L[>N
long now = System.currentTimeMillis(); Pv@Lx+k
if ((now - lastExecuteTime) > executeSep) { WKek^TW4HE
//System.out.print("lastExecuteTime:"+lastExecuteTime); >UlAae44
//System.out.print(" now:"+now+"\n"); $}+t|`*q8]
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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lastExecuteTime=now; ,ELbm
executeUpdate(); \iVb;7r)9:
} xA/Ein0
else{ oK\{#<gCZ
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ai 0am
} DC+p
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} @'P\c
} /r2*le (H
//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 \\}tD@V"
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类写好了,下面是在JSP中如下调用。 kzozjh%`9h
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<% m%7T ~
CountBean cb=new CountBean(); ,%Sf,h?"^
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); w`ebZa/j
out.print(CountCache.list.size()+"<br>"); ?y"=jn
CountControl c=new CountControl(); ;l4epN
c.run(); rs`"Kz`(
out.print(CountCache.list.size()+"<br>"); (m:ktd=x
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