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: gC/-7/}
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CountBean.java (d-j/v*4
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/* |9
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* CountData.java nmrdqSV
* @3>nVa
* Created on 2007年1月1日, 下午4:44 !7anJl
* MM Nz2DEy[
* To change this template, choose Tools | Options and locate the template under JmVha!<qk
* the Source Creation and Management node. Right-click the template and choose ;%PdSG=U
* Open. You can then make changes to the template in the Source Editor. ]I0(_e|z}
*/ +isaqfy/
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package com.tot.count; kN$L8U8f
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/** XJf1LGT5
* }UHoa
* @author B9h>
*/ S?m4
public class CountBean { N+NS\Y5
private String countType; bq`0$c%hN
int countId; f%Bm x{Ttq
/** Creates a new instance of CountData */ Hy1f,D
public CountBean() {} ACxjY2
public void setCountType(String countTypes){ ZBfB4<M9xS
this.countType=countTypes; 0)3*E)g{
} agW#"9]WM
public void setCountId(int countIds){ UkBr4{+aE
this.countId=countIds; ;hp?wb
} ppM^&6x^
public String getCountType(){ K\>CXa
return countType; ic|>JX$G
} }g[(h=Qi
public int getCountId(){ #oD*H:%*
return countId; ^k}jPc6
} }[I|oV5*+&
} ^<O:`c6_
cc$+"7/J^c
CountCache.java REwZ41
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/* oGi{d5
* CountCache.java 3:WXrOl
* kP}91kja
* Created on 2007年1月1日, 下午5:01 [8.w2\<?
* &\o!-EIK8
* To change this template, choose Tools | Options and locate the template under awa$o
* the Source Creation and Management node. Right-click the template and choose K.jm>]'z4;
* Open. You can then make changes to the template in the Source Editor. ceqYyVy
*/ ,b8q$R~\
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package com.tot.count; .% EEly
import java.util.*; +Udlt)H
/** goV[C]|
* S}cm.,/w
* @author o\YF_235
*/ 6?c(ue iL[
public class CountCache { JMq00_
public static LinkedList list=new LinkedList(); Px))O&w{
/** Creates a new instance of CountCache */ A">A@`}
public CountCache() {} -!]dU`:(X
public static void add(CountBean cb){ :S5B3S@|
if(cb!=null){ D;al(q
list.add(cb); vMOit,{
} jVpk) ;vC
} _'E,g@
} ` `R;x
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CountControl.java 0BTLIV$d;
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/* *xOrt)D=
* CountThread.java GlVD!0
* T9+ ?A
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* Created on 2007年1月1日, 下午4:57 +}@HtjM
* VJeN
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* To change this template, choose Tools | Options and locate the template under cHMS[.=;
* the Source Creation and Management node. Right-click the template and choose Y+tXWN"8
* Open. You can then make changes to the template in the Source Editor. =N zA2td
*/ 8y{<M"v+/
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package com.tot.count; 6"W~%FSJX
import tot.db.DBUtils; 43Yav+G(+
import java.sql.*; <j.bG 7
/** oA&V,r
* {>cO&eiCt
* @author YFCP'J"Z
*/ +)fl9>Mb
public class CountControl{ ymBevL
private static long lastExecuteTime=0;//上次更新时间 ` `A=p<W
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 rsR0V+(W
/** Creates a new instance of CountThread */ /*bS~7f1
public CountControl() {} ?Q]{d'g(sx
public synchronized void executeUpdate(){ j [h4F"`-
Connection conn=null; _azg
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PreparedStatement ps=null; l*]*.?m/5
try{ GiN\nu<!
conn = DBUtils.getConnection(); ccJ@jpXI
conn.setAutoCommit(false); #U NTD4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); yjVPaEu]aU
for(int i=0;i<CountCache.list.size();i++){ <"@~
CountBean cb=(CountBean)CountCache.list.getFirst(); Nd~?kZZu
CountCache.list.removeFirst(); %Y` @>P'
ps.setInt(1, cb.getCountId()); %jY/jp=R
ps.executeUpdate();⑴ n@xDFa
//ps.addBatch();⑵ j#b?P=|l
} sgo({zA`i
//int [] counts = ps.executeBatch();⑶ 'Z+~G
conn.commit(); z2&SZ.mk
}catch(Exception e){ ']+ -u{+#
e.printStackTrace(); 1Q6WpS
} finally{ e1X*}OI
try{ ^Q]*CU+C
if(ps!=null) {
P.RlozF5;
ps.clearParameters(); D!~-53f@
ps.close(); ++:v O
ps=null; B8_w3;x
} ~n84x
}catch(SQLException e){} 0EYK3<k9!
DBUtils.closeConnection(conn); V$+xJ m
} z.:{
} JI}(R4uV
public long getLast(){ Wr7^
return lastExecuteTime; $LZf&q:\]*
} A:EF#2)g
public void run(){ DA@YjebP'
long now = System.currentTimeMillis(); PY.c$)az>
if ((now - lastExecuteTime) > executeSep) { $Tt@Xu
//System.out.print("lastExecuteTime:"+lastExecuteTime); \c+)Y}:D
//System.out.print(" now:"+now+"\n"); IBWUeB:b
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); #{GUu',?&
lastExecuteTime=now; n< [np;\
executeUpdate(); dx@#6Fhy
} Rv6{'\:
else{ !Ljs9 =UF
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); X|H%jdta
} sD.bBz
} 5f7;pS<
} jpqq>Hbg_
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 I;L$Nf{v
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类写好了,下面是在JSP中如下调用。 uYS?# g
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<% UHz*Tfjb
CountBean cb=new CountBean(); TdP_L/>|J
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); E) >~0jv
CountCache.add(cb); +}X?+Epm
out.print(CountCache.list.size()+"<br>"); r+0"1\f3
CountControl c=new CountControl(); l'VgS:NT
c.run(); V{fYMgv
out.print(CountCache.list.size()+"<br>"); BUv;BzyV
%>