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: x69RQ+Vw
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CountBean.java UdpuQzV<4`
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/* q[. p(6:
* CountData.java lpbcpB
* _X{ GZJm
* Created on 2007年1月1日, 下午4:44 g/w<T+v
* [BEQ ~A_I
* To change this template, choose Tools | Options and locate the template under dI%N wl%
* the Source Creation and Management node. Right-click the template and choose \@{TF((Y
* Open. You can then make changes to the template in the Source Editor. b<E78B+Aax
*/ F$YT4414
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package com.tot.count; A":cS }Ui
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/** bq}`jP~#
* W*u$e8i7
* @author -O $!sFmY
*/ \23m*3"W
public class CountBean { gL7rX a j
private String countType; ^--8
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int countId; y7Hoy.(
/** Creates a new instance of CountData */ Fgi;%
public CountBean() {} AU8sU?=
public void setCountType(String countTypes){ wOEc~WOd
this.countType=countTypes; q0nIJ(
} }:]CXrdg>
public void setCountId(int countIds){ TALiH'w6|e
this.countId=countIds; ]na$n[T/I
} D]WrPWL8v
public String getCountType(){ n8z++T&
return countType; P9jSLM
} ]L
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public int getCountId(){ ZT<VDcP{
return countId; DyUS^iz~o
} tLP
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} ;B{oGy.
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CountCache.java -'^:+FU
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/* /^WOrMR
* CountCache.java
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* 6$H`wDh#(&
* Created on 2007年1月1日, 下午5:01 &_\;p-1:
* D&OskM60
* To change this template, choose Tools | Options and locate the template under UUGX@
* the Source Creation and Management node. Right-click the template and choose m\MI 6/
* Open. You can then make changes to the template in the Source Editor. 'oUTY *
*/ '#jZ`
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package com.tot.count; \:2z!\iP`
import java.util.*; VKSn \HT~
/** 02-% B~oP
* zd {sw}
* @author jrX`_Y
*/ .Y^pDR12
public class CountCache { XQ8q)B=
public static LinkedList list=new LinkedList(); &
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/** Creates a new instance of CountCache */ 3jHE,5m
public CountCache() {} Uz%ynH
public static void add(CountBean cb){ $"?$r
if(cb!=null){
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list.add(cb); :`uu[^
} JkKbw&65
} I6,||!sZ
} Q
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CountControl.java Q`Rn,kCVy
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/* CY$
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* CountThread.java ant2];0p
* hDc2T
* Created on 2007年1月1日, 下午4:57 { _Y'%Ggh
* }rF4M1+B\
* To change this template, choose Tools | Options and locate the template under .kJu17!
* the Source Creation and Management node. Right-click the template and choose j3u!lZ}U
* Open. You can then make changes to the template in the Source Editor. Y' 5X4Ks|
*/ Iz>\qC}
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package com.tot.count; hf;S#.k
import tot.db.DBUtils; 5Fbb5`(
import java.sql.*; <;cch6Z
/** fUPYCw6F
* !_W']Crb]]
* @author qxYCT$1
*/ PfGiJ]:V-u
public class CountControl{ uO1^nK
private static long lastExecuteTime=0;//上次更新时间 6o*'Q8h
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 bfkFk
/** Creates a new instance of CountThread */ (!Xb8rV0_
public CountControl() {} 5'%O]~
public synchronized void executeUpdate(){ Q5_ ,`r`
Connection conn=null; 6rO^ p
PreparedStatement ps=null; Pon0(:#1
try{ 12Fnv/[n'K
conn = DBUtils.getConnection(); 6z'0fi|EN
conn.setAutoCommit(false); {wO.nOB
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 735l&(3A\
for(int i=0;i<CountCache.list.size();i++){ IoV"t,
CountBean cb=(CountBean)CountCache.list.getFirst(); w7 \vrS>&
CountCache.list.removeFirst(); B~,?Gbl+g
ps.setInt(1, cb.getCountId()); @gQ?cU 7
ps.executeUpdate();⑴ /AYq^
//ps.addBatch();⑵ MJa`4[/
} "hZ `^"0b
//int [] counts = ps.executeBatch();⑶ e-.(O8
conn.commit(); rA@|nL{
}catch(Exception e){ 9Vt6);cA-]
e.printStackTrace(); Ok}e|b[D
} finally{ <TSps!(#
try{ O"_QDl<ya
if(ps!=null) { Bgai|l
ps.clearParameters(); ^;?w<9Y
ps.close(); SCfk!GBVD
ps=null; ETR7%0$r
} =PnNett}a
}catch(SQLException e){} !~j9Oc^
DBUtils.closeConnection(conn); {96NtR0Z
} PTTUI
} ]{I>HA5[
public long getLast(){ y{XNB}E
return lastExecuteTime; %{me<\(
} W>'gG}.
public void run(){ E;"VI2F
long now = System.currentTimeMillis(); A.YK=_J
if ((now - lastExecuteTime) > executeSep) { dkg+_V!
//System.out.print("lastExecuteTime:"+lastExecuteTime); {3!A\OR
//System.out.print(" now:"+now+"\n"); pTJ_DH
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); CI+li H
lastExecuteTime=now; R1.Yx?
executeUpdate(); `[ZA#8Ma
} n"R$b:
else{ 715J1~aRNr
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =YtK@+| i
} FE#|5;q.
} +RK/u
} f,BJb+0
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 <YWu/\{KT
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类写好了,下面是在JSP中如下调用。 'OMl9}M
[u-=<hnoa
<% MJKPpQ(,
CountBean cb=new CountBean(); C3 m_sv#e
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 37V$Qb_
CountCache.add(cb); ADMeOdgca
out.print(CountCache.list.size()+"<br>"); &((04<@e
CountControl c=new CountControl(); ?w)A`G_
c.run(); kC'm |Y@T
out.print(CountCache.list.size()+"<br>"); zD
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%>