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: w1Z9@*C!
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CountBean.java BDW%cs
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/* \2q!2XWgK
* CountData.java ^Ge3"^x1
* -)biSU,
* Created on 2007年1月1日, 下午4:44 N5>ioJj
* 0w'%10"&U+
* To change this template, choose Tools | Options and locate the template under XBd/,:q
* the Source Creation and Management node. Right-click the template and choose w8!S;~xKI
* Open. You can then make changes to the template in the Source Editor. :'*;>P
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*/ sdk%~RN0T
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package com.tot.count; ![=C`O6K
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/** L : hEt
* 4Wz@^7|V5
* @author p^QEk~qw
*/ {+CW_ce
public class CountBean { !(:R=J_h
private String countType; FerQA9K)x
int countId; QnsD,F; /
/** Creates a new instance of CountData */ Nj8 `<Sl
public CountBean() {} gq[|>Rs75
public void setCountType(String countTypes){ ,e6n3]W8
this.countType=countTypes; B d#D*"gx
} [,A*nU$
public void setCountId(int countIds){ ,{"%-U#z
this.countId=countIds; )bJS*#
} vbH?[Zr?
public String getCountType(){ PuKT0*_ 7
return countType; OEz'&))J
} R>BZQugZ~
public int getCountId(){ dso6ZRx
return countId; cg16|
}
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} ,(h:0L2v7d
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CountCache.java T$ <l<.Qd
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/* blbL49;
* CountCache.java o :`>r/SlL
* AfU~k!4`
* Created on 2007年1月1日, 下午5:01 WCK;r{p%I
* YNEPu:5J
* To change this template, choose Tools | Options and locate the template under SFKfsb !C
* the Source Creation and Management node. Right-click the template and choose e^;<T9Esr
* Open. You can then make changes to the template in the Source Editor. >=G-^z:
*/ mB.ybrig
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package com.tot.count; gP&G63^
import java.util.*; @FC|1=+
/** T8nOb9Nrj
* ZbmBwW_ 7
* @author \UBTNY,
*/ uBdS}U
public class CountCache { 1}O&q6\"J
public static LinkedList list=new LinkedList(); *fz]Q>2g a
/** Creates a new instance of CountCache */ o>(I_3J[p
public CountCache() {} * z,] mi%
public static void add(CountBean cb){ TR@*tfS
if(cb!=null){ xqP DL9\
list.add(cb); r&$r=f<
} J.nJ@?O+
} *{_WM}G
} o75Hit
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CountControl.java x~!gGfP
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/* `7.(dn>WL0
* CountThread.java _J|cJ %F>%
* {KH!PAh
* Created on 2007年1月1日, 下午4:57 KwEyMR!
* yeI((2L@E2
* To change this template, choose Tools | Options and locate the template under 7iI6._"!w
* the Source Creation and Management node. Right-click the template and choose jv8diQ.
* Open. You can then make changes to the template in the Source Editor. <xb =.xe
*/ Bo)N<S_=^
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package com.tot.count; \FE
import tot.db.DBUtils; n'WhCrW
import java.sql.*; bSK> p3
/** %Z:07|57I[
* S,Y\ox-
* @author `5J`<BPs
*/ <B+xE?v4
public class CountControl{ } "QV{W
private static long lastExecuteTime=0;//上次更新时间 m%?+;V
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `>kHJI4
/** Creates a new instance of CountThread */ [I
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public CountControl() {} K<BS%~,I
public synchronized void executeUpdate(){ vdhwFp~Y
Connection conn=null; Ub>Pl,~'
PreparedStatement ps=null; l_?r#Qc7
try{ 0!Zp4>l\Z
conn = DBUtils.getConnection(); WTlR>|Zdn
conn.setAutoCommit(false); **RW
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); bcVzl]9
for(int i=0;i<CountCache.list.size();i++){ 71g\fGG\
CountBean cb=(CountBean)CountCache.list.getFirst(); -#TF&-
CountCache.list.removeFirst(); F<W`zQ46
ps.setInt(1, cb.getCountId()); :6N'%LKK
ps.executeUpdate();⑴ h'QEwW
//ps.addBatch();⑵
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} B#zu<z
//int [] counts = ps.executeBatch();⑶ EZN38T
conn.commit(); Qp]-:b
}catch(Exception e){ -W6r.E$mC
e.printStackTrace(); EWU(Al T
} finally{ oU\Q|mN(
try{ y2_^lW%
if(ps!=null) { (]Zyk,[
ps.clearParameters(); do-mkvk
ps.close(); oB BL7/L
ps=null; f@G3,u!]i
} <'Ppu
}catch(SQLException e){} :J
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DBUtils.closeConnection(conn); Zze(Ik
} <Z0N)0|
} $qvk9 B0E
public long getLast(){ =|Q7k +b
return lastExecuteTime; F:3*i^ L
} 834E
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public void run(){ :!fP~(R'm
long now = System.currentTimeMillis(); |FR'?y1
if ((now - lastExecuteTime) > executeSep) { r[u@[
//System.out.print("lastExecuteTime:"+lastExecuteTime); Nt>wzPd)
//System.out.print(" now:"+now+"\n"); sKIpL(_I$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 7KB:wsz^
lastExecuteTime=now; bD: yu
executeUpdate(); 1@i 8ASL
} U\<8}+x
else{ &EZq%Sd
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); s#nd:$p3
} +"~~;J$
} }3}{} w0Y
} \!]Zq#*kH
//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 4R;6u[a]u
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类写好了,下面是在JSP中如下调用。 c@uNA0
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<% \W;+@w|c
CountBean cb=new CountBean(); gG>|5R0
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); A,WZ}v}_
CountCache.add(cb); |=xK-;qs
out.print(CountCache.list.size()+"<br>"); vvsQf%
CountControl c=new CountControl(); a4B#?p
c.run(); L,KK{o|Eq
out.print(CountCache.list.size()+"<br>"); Dej2-Y
%>