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: 1Z%^U ?
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CountBean.java Xu\FcQ{
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/* lx_jy>$}r
* CountData.java s\2t|d
* VM=A#}
* Created on 2007年1月1日, 下午4:44 uJ<nW%}
* {JTO
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* To change this template, choose Tools | Options and locate the template under TbX#K:l
* the Source Creation and Management node. Right-click the template and choose &x6Z=|Ers
* Open. You can then make changes to the template in the Source Editor. E0; }e
*/ ~R^~?Y%+<
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package com.tot.count; Pu/X_D-#Gi
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/** 1bjhEOW
* )7!q>^S{B
* @author Jm8{@D%
*/ Ey<vvZ
public class CountBean { ~Sy/q]4ys*
private String countType; ]."~)
int countId; P`r@<cgb=
/** Creates a new instance of CountData */ [Q+8Ku
public CountBean() {} iR}3 [
public void setCountType(String countTypes){ SNqw2f5
this.countType=countTypes; ;[@);-9q
} F/,K8<|r>
public void setCountId(int countIds){ qQK0s*^W
this.countId=countIds; XgRrJ.
} 7^1yZ1(
public String getCountType(){ .m%/JquMFM
return countType; L3}n(KAJj
} M~%~y`D^
public int getCountId(){ N3/G6wn
return countId; vEQw`OC
} `! ~~Wf'
} v:/+OzY
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CountCache.java 3j<:g%5
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/* C1w~z4Qp
* CountCache.java [R
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* $Ro]]NUz|
* Created on 2007年1月1日, 下午5:01 Mn$w_Z?
* T%0vifoQ_$
* To change this template, choose Tools | Options and locate the template under o[Ojl.r<
* the Source Creation and Management node. Right-click the template and choose =AEl:SY+
* Open. You can then make changes to the template in the Source Editor. .quui\I3
*/ MzUNk`T @
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package com.tot.count; Cka&b
import java.util.*; .*N]SbU<8
/** 0zJT_H+
* 0X \OQ;
* @author :
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*/ `| nC r
public class CountCache { `zf,$67>1
public static LinkedList list=new LinkedList(); 2I:x)
/** Creates a new instance of CountCache */ wxC&KrRF
public CountCache() {} n1
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public static void add(CountBean cb){ K>%}m,
if(cb!=null){ Y]>!uwn
list.add(cb); 4}0DEH.Vx
} 6<aZr\Ufg
} 2AYV9egZ
} p@B/S(Xi
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CountControl.java GxH]
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/* ,q9nHZG^
* CountThread.java )9F o
* o>Fc.$ngZ
* Created on 2007年1月1日, 下午4:57 cD^`dn%$
* O5rHN;\_
* To change this template, choose Tools | Options and locate the template under pF0sXvWGG
* the Source Creation and Management node. Right-click the template and choose Q=B>Q
* Open. You can then make changes to the template in the Source Editor. 8+}yf.`
*/ RbOEXH*]
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package com.tot.count; 0}LBnV
import tot.db.DBUtils; q47>RWMh%
import java.sql.*; =f48[=
/** 9E`WZo^.
* 6t zUp/O
* @author ^a>3U l{
*/ eXs^YPi
public class CountControl{ ~rnbuIh
private static long lastExecuteTime=0;//上次更新时间 T"h@-UcTl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 .\Z/j
/** Creates a new instance of CountThread */ *?? !~RE
public CountControl() {} 1co;U
public synchronized void executeUpdate(){ 'YQVf]4P
Connection conn=null; {@1;kG
PreparedStatement ps=null; a7$]"
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try{ Z<_"Tk;!',
conn = DBUtils.getConnection(); ,K/l;M5I
conn.setAutoCommit(false); 8x)&4o@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $] ])FM"b
for(int i=0;i<CountCache.list.size();i++){ " a&|{bv
CountBean cb=(CountBean)CountCache.list.getFirst(); ]81t~t9LQ
CountCache.list.removeFirst(); WFr;z*
ps.setInt(1, cb.getCountId()); F!k3/z
ps.executeUpdate();⑴ &^q!,7.J
//ps.addBatch();⑵ 6[.#B!;9
} f$7Xh~
//int [] counts = ps.executeBatch();⑶ $ ,:3I*}be
conn.commit(); w^Mj[v#
}catch(Exception e){ ON,sN
e.printStackTrace(); :| s
} finally{ #'5C*RO
try{ %|"0p3
if(ps!=null) { EO.Se9ux
ps.clearParameters(); B|\JGnNQ
ps.close(); kjj4%0"
ps=null; ]VKM3[
} i`nmA-Zj[
}catch(SQLException e){} a *hWODYn
DBUtils.closeConnection(conn); Gt4/ax:A@
} |_6V+/?"?`
} V
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public long getLast(){ z`}<mY
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return lastExecuteTime; j . "L=
} cVV @MC
public void run(){ Pv#Oea?
long now = System.currentTimeMillis(); "=0(a)01p:
if ((now - lastExecuteTime) > executeSep) { ?IN'Dc9&%-
//System.out.print("lastExecuteTime:"+lastExecuteTime); @V\u<n
//System.out.print(" now:"+now+"\n"); :CeK
'A\
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); \X*Es.;|x
lastExecuteTime=now; p&s~O,Bw$
executeUpdate(); TmS-w
} 3-=f@uH!
else{ &g;&=<#I
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); I>bO<T`
} pftnFOLO
} $q$G
} X_3*DqY
//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 -n:~m
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类写好了,下面是在JSP中如下调用。 "^froQ{"T
" jBc5*
<% u?Uu>9@Z
CountBean cb=new CountBean(); Tqf:G4!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); +GYO<N7
CountCache.add(cb); ,J$XVvwxF
out.print(CountCache.list.size()+"<br>"); = :/4)
CountControl c=new CountControl(); `iQ])C^d
c.run(); >eC>sTPQ{
out.print(CountCache.list.size()+"<br>"); \PzJ66DL!
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