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: An]Vx<PD
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CountBean.java e0C_ NFS+
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/* O>*Vo!z\f
* CountData.java HII@Ed f?
* ,*[N_[
* Created on 2007年1月1日, 下午4:44 g6gwNC:aF
* xJ^B.;>
* To change this template, choose Tools | Options and locate the template under 55b/giX
* the Source Creation and Management node. Right-click the template and choose Yl1l$[A$
* Open. You can then make changes to the template in the Source Editor. nr>Yj?la
*/ $5#DU__F/
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package com.tot.count; A{3nz DLI
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/** ?J|
* ?`:+SncI"b
* @author )eX{a/Be
*/ ZP:+ '\&J
public class CountBean { }Oe4wEYN)
private String countType; >kuu\
int countId; cI6Td*vM
/** Creates a new instance of CountData */ 1k%HGQM{
public CountBean() {}
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public void setCountType(String countTypes){ ~1Ffu x
this.countType=countTypes; (nkiuCO
} $|@-u0sv
public void setCountId(int countIds){ '^Q$:P{G?
this.countId=countIds; g/!tp;e
} |*~SR.[`
public String getCountType(){ *aYuuRx
return countType; &`g^b^i
} {XXnMO4uR;
public int getCountId(){ %4wHiCOg
return countId;
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} R<r,&X?m
} O^~nf%
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CountCache.java WQ{^+C9g'1
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/* 5sB~.z@
* CountCache.java #8WHIDS>
* B;<zA' 1
* Created on 2007年1月1日, 下午5:01 Xag#ZT
* ;6=*E '
* To change this template, choose Tools | Options and locate the template under S""F58H n
* the Source Creation and Management node. Right-click the template and choose Sq`Zuu9t
* Open. You can then make changes to the template in the Source Editor. CE4Kc33OU|
*/
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package com.tot.count; %YG[?"P'
import java.util.*; -^>7\]
/** T'5MO\
* a!&<jM
* @author BtF7P}:MGf
*/ 8wCB}q C
public class CountCache { j9f Q V
public static LinkedList list=new LinkedList(); p3IhK>
/** Creates a new instance of CountCache */ A4)TJY
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public CountCache() {} ?{1& J9H
public static void add(CountBean cb){ DH])Q5
if(cb!=null){ 4SIS#m
list.add(cb); <,t6A?YoMP
} p-6T,')
} 2}9M7Z",2
} dlDO?T
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CountControl.java K*tomy
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/* <@>l9_=R
* CountThread.java
: !wt/Y
* T=[/x=
* Created on 2007年1月1日, 下午4:57 1(WBvAPS
*
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* To change this template, choose Tools | Options and locate the template under b%xG^jUXsX
* the Source Creation and Management node. Right-click the template and choose =<r1sqf
* Open. You can then make changes to the template in the Source Editor. "BC;zH:
*/ 55zy]|F"
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package com.tot.count; ugs9>`fF&
import tot.db.DBUtils; Eg_ram`\R
import java.sql.*; ~6#O5plKc
/** vSwRj<|CF
* ]}9[ys
* @author OgCz[QXr_
*/ |+Tq[5&R
public class CountControl{ O_v*,L!
private static long lastExecuteTime=0;//上次更新时间 -o@L"C>
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -7VQ{nC
/** Creates a new instance of CountThread */ ^MvBW6#1
public CountControl() {} m-<m[ 49
public synchronized void executeUpdate(){ [6\b(kS+
Connection conn=null; C ~04#z_$
PreparedStatement ps=null; {n(/ c33
try{ 7Q?^wx
conn = DBUtils.getConnection(); 1YtK+,mz
conn.setAutoCommit(false); L fZF
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !iW>xo
for(int i=0;i<CountCache.list.size();i++){ c-ql
CountBean cb=(CountBean)CountCache.list.getFirst(); 8;x0U`}Ez(
CountCache.list.removeFirst(); /Edq[5Ah
ps.setInt(1, cb.getCountId()); _[/#t|I}
ps.executeUpdate();⑴ W@D./Th
//ps.addBatch();⑵ m%s:4Z%=
} M<P8u`)>4H
//int [] counts = ps.executeBatch();⑶ !i\ gCLg2_
conn.commit();
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}catch(Exception e){ 22 feYm|
e.printStackTrace(); [gj>ey8T
} finally{ xL"O~jTS
try{ "6Z(0 iu:{
if(ps!=null) { wYQEm
ps.clearParameters(); uc/W/c u,
ps.close(); i:1
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ps=null; ^%!#Q].
} eg24.W9c
}catch(SQLException e){} "Cs36k
DBUtils.closeConnection(conn); 9+3 VK
} IL`=r6\
} /O~Np|~v
public long getLast(){ !@ {sM6U
return lastExecuteTime; ri6KD
} <LN7+7}
public void run(){ 8 #:k
long now = System.currentTimeMillis(); b7B|$T,
if ((now - lastExecuteTime) > executeSep) {
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//System.out.print("lastExecuteTime:"+lastExecuteTime); W||&Xb
//System.out.print(" now:"+now+"\n"); l z-I[*bA
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !;0K=~(Y^
lastExecuteTime=now; JfmYr47Pv
executeUpdate(); %`YR+J/V
} QNH3\<IS
else{ Hz)i.AA 4
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Xt
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} M=3gV?N
} AREjS$
} bc3`x1)\^
//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 +wf9!_'
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类写好了,下面是在JSP中如下调用。 # 1dg%
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<% );kD0FO1|
CountBean cb=new CountBean(); U_l9CZ
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Np aS2q-d
CountCache.add(cb); ESYF4-d+
out.print(CountCache.list.size()+"<br>"); Hq!|r8@6
CountControl c=new CountControl(); e['<.Yf+
c.run(); ambr}+}
out.print(CountCache.list.size()+"<br>"); is~2{:
%>