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: 69uDc
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CountBean.java KiC,O7&<
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/* Sw[*1C8
* CountData.java +Bt%W%_X
* Sv>CVp*
* Created on 2007年1月1日, 下午4:44 PIQd=%?'
* qla=LS\-A+
* To change this template, choose Tools | Options and locate the template under b1=! "Y@
* the Source Creation and Management node. Right-click the template and choose E J6|y'
* Open. You can then make changes to the template in the Source Editor. L!ms{0rJ
*/ * "?,.
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package com.tot.count; NW21{}=4
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/** }>YEtA
* ^QHgc_oDm
* @author pMUUF5
*/ y=SpIbn{
public class CountBean { Nlc3S+$`z
private String countType; _R
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int countId; '=K~M
/** Creates a new instance of CountData */ "Nq5FcS9
public CountBean() {} vsI|HxpyC,
public void setCountType(String countTypes){ 4Xn-L&0z
this.countType=countTypes; oVfRp.a
} EWVn*xl?
public void setCountId(int countIds){ iE{VmHp=
this.countId=countIds; <<YH4}wZ
} ('=Q[ua7-(
public String getCountType(){ poqNiOm4%
return countType; brF) %x`
} nnd-d+$
public int getCountId(){ y,<\d/YY@
return countId; "*d%el\63
} %]F{aR
} /KO2y0`
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CountCache.java 6gq`V,
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/* f~p[izt
* CountCache.java bD1IY1
* @_;vE(!5
* Created on 2007年1月1日, 下午5:01 o O1Fw1Y
* i^}DIx{
* To change this template, choose Tools | Options and locate the template under :pP l|"
* the Source Creation and Management node. Right-click the template and choose $f6wmI;<y
* Open. You can then make changes to the template in the Source Editor. ~}K$z
*/ >lO]/3j1
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package com.tot.count; ?V)M!
import java.util.*; dda*gq/p
/** TP=#U^g*
* Hegj_FQ
* @author !T]bz+
*/ ~llw_w
public class CountCache { eI5W; Q4
public static LinkedList list=new LinkedList(); 0IbR>zFg.
/** Creates a new instance of CountCache */ oi^pU
public CountCache() {} @CCDe`R*
public static void add(CountBean cb){ [;7$ 'lr%D
if(cb!=null){ p,OB;Ncf/
list.add(cb); PV/ hnVUl
} ,L(q/#p
} +C=^,B!,
} 1-pxM~Y
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CountControl.java o{K#LP
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/* <r8s=<:
* CountThread.java U+ief?;4F
* {'f=*vMI
* Created on 2007年1月1日, 下午4:57 hOcVxSc.
* glNXamo
* 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 ;J?zD9
* Open. You can then make changes to the template in the Source Editor. .+`Z:{:BC&
*/ >=L<3W1
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package com.tot.count; gG,gL9o
import tot.db.DBUtils; 'v&f
import java.sql.*; 7{u1ynt
/** xJE26i
* =>)4>WT8A
* @author /p[lO g
*/ Sh o] ~)XX
public class CountControl{ t1]svVX,w
private static long lastExecuteTime=0;//上次更新时间 4VlQN$
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 PZCOJK
/** Creates a new instance of CountThread */ T_4y;mf!@O
public CountControl() {} rqi|8gKY
public synchronized void executeUpdate(){ .RWKZB
Connection conn=null; |z.Z='`
PreparedStatement ps=null; xz vbjS W
try{ 7|pF(sb0
conn = DBUtils.getConnection(); jb!15Vlt"
conn.setAutoCommit(false); UE%~SVi.#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); lRA!
for(int i=0;i<CountCache.list.size();i++){ 83gp'W{|
CountBean cb=(CountBean)CountCache.list.getFirst(); 2S_7!|j
CountCache.list.removeFirst(); VaFv%%w
ps.setInt(1, cb.getCountId()); K<D=QweOon
ps.executeUpdate();⑴ EN@Pr `R
//ps.addBatch();⑵ :|E-Dx4F6H
} P}$DCD<$U
//int [] counts = ps.executeBatch();⑶ ZklZU,\!|v
conn.commit(); %0^taA
}catch(Exception e){ ch:0qgJ
e.printStackTrace(); v.e~m2u_F
} finally{ Z3nmC-NE
try{ x[eho,6)
if(ps!=null) { 3h>56{P
ps.clearParameters(); :~dI2e\:
ps.close(); Kx5VR4f`J@
ps=null; PLDp=T%
} K6;
s xF
}catch(SQLException e){} ; Uf]-uS
DBUtils.closeConnection(conn); >KnXj7
} ]tDuCZA
} ?Y#x`DMh
public long getLast(){ a2`|6M;
return lastExecuteTime; jM|-(Es.)
} 5oR/Q|^
public void run(){ hS 7o=G[
long now = System.currentTimeMillis(); -PH!U Hg
if ((now - lastExecuteTime) > executeSep) { 2ID]it\5
//System.out.print("lastExecuteTime:"+lastExecuteTime); #MI4 `FZ
//System.out.print(" now:"+now+"\n"); IAa}F!6Q1
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !S}4b
lastExecuteTime=now; J+20]jI
executeUpdate(); #[aHKq:?b
} Y1h)0_0
else{ x9B{|+tIoc
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); dw
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} \4pWHE/
} W_P&;)E
} Z4'8x 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 O&De!Gx
A +J&(7N
类写好了,下面是在JSP中如下调用。 ` p)$7!
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<% q+/7v9
CountBean cb=new CountBean(); [qGj*`@C
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); lZ` CFZR0
CountCache.add(cb); a jyuk@
out.print(CountCache.list.size()+"<br>"); TbPTgE *
CountControl c=new CountControl(); tHV81F1J
c.run(); ag\xwS#i5H
out.print(CountCache.list.size()+"<br>"); NU?05sF
%>