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: z/ i3
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CountBean.java &sllM
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/* ^1g6(k'
* CountData.java wx1uduT)
* bw[!f4~
* Created on 2007年1月1日, 下午4:44 aR\=p:%jGI
* OW.ckYt%
* To change this template, choose Tools | Options and locate the template under 2#&K3v
* the Source Creation and Management node. Right-click the template and choose jv7zvp
* Open. You can then make changes to the template in the Source Editor. C +IXP
*/ (PNvv/A
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package com.tot.count; Ff,M~zn
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/** 7OZs~6(
* oYF8:PYB
* @author S*]IR"YL
*/ /yOd]N;$
public class CountBean { '5Y8 rv<
private String countType; KW09qar
int countId; fT@#S}t
/** Creates a new instance of CountData */ z(m*]kpL"
public CountBean() {} *<UQ/)\
public void setCountType(String countTypes){ z[';HJ0O;
this.countType=countTypes; gC3{:MC-G
} m$o|s1t
public void setCountId(int countIds){ -0kwS4Hx2
this.countId=countIds; $a-~ozr`C
} vxwctJ&
public String getCountType(){ 7e40 }n
return countType; xJ3#k;
} e88JT_zrO
public int getCountId(){ A>PM'$"sT
return countId; qvt~wJf<
} 6zDJdE'Es
} qV^H vZJ
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CountCache.java bH=5[
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/* J#D!J8KP7
* CountCache.java GJW1|Fk
* u'N'<(\k
* Created on 2007年1月1日, 下午5:01 0]WM:6 h
* -aO3/Ik[q
* To change this template, choose Tools | Options and locate the template under QQ?` 1W
* the Source Creation and Management node. Right-click the template and choose -1< }_*
* Open. You can then make changes to the template in the Source Editor. GoF C!nx
*/ -_2=NA?t
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package com.tot.count; eAl&[_o|S
import java.util.*; iWvgCm4
/** P_qxw-s
* `R; ct4-
* @author _h.[I8xgYG
*/ C ]#R7G
public class CountCache { p%G\5.GcJL
public static LinkedList list=new LinkedList(); SKYS6b
/** Creates a new instance of CountCache */ r67 3+
public CountCache() {} & XrV[d[>
public static void add(CountBean cb){ E`'+1
if(cb!=null){ :Z/ig%
list.add(cb); mG2}JWA
} lh5k@\X
} ?!
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} CUYp(GU
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CountControl.java *{tJ3<t(1
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/* UL{Xe&sT
* CountThread.java PCFm@S@Q
* k1%Ek#5
* Created on 2007年1月1日, 下午4:57 bhg"<I
* hup]Jk
* To change this template, choose Tools | Options and locate the template under %i^%D
* the Source Creation and Management node. Right-click the template and choose N/y.=]
* Open. You can then make changes to the template in the Source Editor. \(Hg_]>m
*/ "PlM{ZI\
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package com.tot.count; 7&+Gv6E
import tot.db.DBUtils; t=U[ ;?
import java.sql.*; 9,F(f}(t
/** 6bU/IVP
* zg^5cHP\
* @author zZA I"\;W
*/ m2 OP=z@)
public class CountControl{ {wd.aUB
private static long lastExecuteTime=0;//上次更新时间 2Yyc`o0R;h
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 6vmkDL8{A8
/** Creates a new instance of CountThread */ c[Y7tj%y
public CountControl() {} ZM5[
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public synchronized void executeUpdate(){ fXL$CgXG\x
Connection conn=null; |&C.P?q
PreparedStatement ps=null; z[7U>q[E
try{ 9m8`4%y=
conn = DBUtils.getConnection(); C~:aol i;
conn.setAutoCommit(false); _tYt<oB~%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Vg2s~ce{
for(int i=0;i<CountCache.list.size();i++){ bluC P|
CountBean cb=(CountBean)CountCache.list.getFirst(); 9}5Q5OZ
CountCache.list.removeFirst(); $H-s(3vq
ps.setInt(1, cb.getCountId()); bk"` hq
ps.executeUpdate();⑴ *S;v406
//ps.addBatch();⑵ kkqrlJO|
} whvM^
//int [] counts = ps.executeBatch();⑶ K34y3i_
conn.commit(); ZfMJU
}catch(Exception e){ @aBZ|8
e.printStackTrace(); ,A_itRHH
} finally{ PN<Y&/fB
try{ U4Qc$&j>
if(ps!=null) { ~Fisno
ps.clearParameters(); d<!bE(
ps.close(); >)!"XFbb
ps=null; RU#Q<QI(
} LkJ3 :3O
}catch(SQLException e){} |f`!{=?
DBUtils.closeConnection(conn); I:='LH,
} JTdK\A>l
} -O -_F6p'D
public long getLast(){ ynDa4HB
return lastExecuteTime; F4d L{0;j
} w_e Las%
public void run(){ @{~x:P5g
long now = System.currentTimeMillis(); y?Fh%%uNr
if ((now - lastExecuteTime) > executeSep) { wgI$'tI
//System.out.print("lastExecuteTime:"+lastExecuteTime); r?V\X7` +
//System.out.print(" now:"+now+"\n"); XnV|{X%]U
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Z+Z`J;
,
lastExecuteTime=now; KXYq|w
executeUpdate(); e,8C}
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} `N2zeFG
else{ <gJ|Wee
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Dh J<\_;
} 4l[f}Z
} HOXqIZN85
} ^'[Rb!Q8
//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 5LXK#+Z
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类写好了,下面是在JSP中如下调用。 /q(+r5k \
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<% F|Jo|02
CountBean cb=new CountBean(); =suj3.
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); NCX!ss
CountCache.add(cb); 0=7C-A1(D
out.print(CountCache.list.size()+"<br>"); ^yjc"r%B
CountControl c=new CountControl(); P4ot,Q4
c.run(); 42
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out.print(CountCache.list.size()+"<br>"); q4lL7@_
%>