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: VYR<x QA
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CountBean.java +UM%6Z=+
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/* yv;KKQ
* CountData.java mhNX05D
* 5V $H?MW>
* Created on 2007年1月1日, 下午4:44 mi';96
* LJ8 t@ui
* To change this template, choose Tools | Options and locate the template under >fq]c
* the Source Creation and Management node. Right-click the template and choose sQ}E4Iq1#S
* Open. You can then make changes to the template in the Source Editor. ;_K3/:
*/ Xf YbWR
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package com.tot.count; WR.>?IG2E
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/** +QW|8b
* '=WPi_Z5:C
* @author ez-jVi-Fi
*/ q\$k'(k>35
public class CountBean { m ?e::W
private String countType; C>:,\=y%
int countId; tH)fu%:p
/** Creates a new instance of CountData */ <G_71J`MLC
public CountBean() {} zk;'`@7
public void setCountType(String countTypes){ 5Ic'6AIz
this.countType=countTypes; @ *<`*W
} 'PqKb%B|
public void setCountId(int countIds){ ~Fe$/*v
this.countId=countIds; <-h[I&."
} {y%|Io`P
public String getCountType(){ '>^!a!<G
return countType; !jTxMf
} h}U>K4BJ
public int getCountId(){ Wt M1nnJp
return countId; hh[@q*C
} @kPe/j/[1
} fq[1 |Q
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CountCache.java
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/* /8? u2
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* CountCache.java h
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* (
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* Created on 2007年1月1日, 下午5:01 :\]qB&
* 6pdek3pOCt
* To change this template, choose Tools | Options and locate the template under eyzXHS*s;L
* the Source Creation and Management node. Right-click the template and choose pt%*Y.)az
* Open. You can then make changes to the template in the Source Editor. ;U&~tpd
*/ E*vh<C
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package com.tot.count; LL_@nvu}M
import java.util.*; ILIv43QKM(
/** vhGX&
* =X;h _GQ
* @author m2\[L/W]
*/ Vz]yJ:
public class CountCache { r`Bm"xI
public static LinkedList list=new LinkedList(); (-Qr.t_B`
/** Creates a new instance of CountCache */ Rr0]~2R
public CountCache() {} O&
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public static void add(CountBean cb){ w&>*4=^a
if(cb!=null){ #OwxxUeZ
list.add(cb); wCEcMVT
} n+1`y8dy
} )tx2lyY:
} @;X#/dZe
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CountControl.java "9#hk3*GqX
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/* HBm(l@#.
* CountThread.java jG%J.u^k
* ()ww9L2
* Created on 2007年1月1日, 下午4:57 T}jW,Ost
* MP
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* To change this template, choose Tools | Options and locate the template under |)OC1=As
* the Source Creation and Management node. Right-click the template and choose #!C|~=
* Open. You can then make changes to the template in the Source Editor. 5^Ny6t
*/ OyQ[}w3o|
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package com.tot.count; |*g\-2j{
import tot.db.DBUtils; tN;^{O-(V
import java.sql.*; `0`#Uf_/$
/** iSNbbu#
* 0E7h+]bh|
* @author
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*/ $+ORq3
public class CountControl{ uMjL>YLq{?
private static long lastExecuteTime=0;//上次更新时间 g:YUuZ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 H<"EE15
/** Creates a new instance of CountThread */ YbF}>1/"
public CountControl() {} ma6Wr !J
public synchronized void executeUpdate(){ ]l}bk]
Connection conn=null; wlDo(]mj=O
PreparedStatement ps=null; 8:U0M'}u>
try{ epI~w
conn = DBUtils.getConnection(); ddY-F
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conn.setAutoCommit(false); t!59upbN}3
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); .M s$)1
for(int i=0;i<CountCache.list.size();i++){ R@KWiV
CountBean cb=(CountBean)CountCache.list.getFirst(); w{riXOjS4
CountCache.list.removeFirst(); k- exqM2x=
ps.setInt(1, cb.getCountId()); c_ u7O
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ps.executeUpdate();⑴ =N2@H5+7
//ps.addBatch();⑵ qE.3:bQ!`
} S`& yVzv
//int [] counts = ps.executeBatch();⑶ k>=wwPy
conn.commit(); >:OP+Vc
}catch(Exception e){ AMN`bgxW
e.printStackTrace(); _ucixM#
} finally{ ZU`HaL$
try{ I7C+XUQkQ
if(ps!=null) { ,=2)1I]
ps.clearParameters(); dKmPKeJM
ps.close(); Lr Kx
ps=null; RN$q,f[#
} ]d*O>Pm
}catch(SQLException e){} p
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DBUtils.closeConnection(conn); KVHK~Y-G
} Uv(}x7e)
} P0rdGf 5T
public long getLast(){ *-'`Ea
return lastExecuteTime; oJZ0{^
} 0ke1KKy/d
public void run(){ O]l-4X#8F
long now = System.currentTimeMillis(); uN0'n}c;1.
if ((now - lastExecuteTime) > executeSep) { ~Fo`Pr_
//System.out.print("lastExecuteTime:"+lastExecuteTime); I#xhmsF
//System.out.print(" now:"+now+"\n"); r#d]"3tH
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Xy9'JVV6
lastExecuteTime=now; 7'5/T]Z
executeUpdate(); d;a"rq@a)
} 7o-}86x#
else{ J?Rp
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); V/ZWyYxjLi
} @^`5;JiUk
} iHWt;]
} y*8;T v|
//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 eTt{wn;6
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类写好了,下面是在JSP中如下调用。 Xm6M s<z6
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<% `Mo%)I<`=
CountBean cb=new CountBean(); G~NhBA9
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Xg;q\GS/<i
CountCache.add(cb); &WdP=E"
out.print(CountCache.list.size()+"<br>"); >P6U0
CountControl c=new CountControl(); ! &V,+}>)
c.run(); eXdH)|l,\
out.print(CountCache.list.size()+"<br>"); r<*Y1;7H'
%>