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: Egi<m
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CountBean.java V)mRG`L
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/* ]S[M]-I
* CountData.java ? DWF7{1
* 4N[8LC;MH
* Created on 2007年1月1日, 下午4:44 ,P3nZ
* L%# #U'e3
* To change this template, choose Tools | Options and locate the template under il(dVW
* the Source Creation and Management node. Right-click the template and choose <S:SIaf0
* Open. You can then make changes to the template in the Source Editor. 4GH?$p|LX
*/ _ n,Ye&m
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package com.tot.count; _Jn-# du
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/** iq)4/3"6
* <Td4 o&JR
* @author ykrb/j|rK
*/ ne4j_!V{Mf
public class CountBean { 8_US.52V
private String countType; &> tmzlww
int countId; R*lJe6
/** Creates a new instance of CountData */ vn}:$|r$J
public CountBean() {} })#6BN
public void setCountType(String countTypes){ w[~O@:`]<o
this.countType=countTypes; ^a#Vp
} 6}ct{Q
public void setCountId(int countIds){ PE4#dx^
this.countId=countIds; g]PmmK_L
} ;N6Euiz
public String getCountType(){ '!>LF1W=
return countType; ~:~-AXaMT
} o(Yj[:+m
public int getCountId(){ 8Ux3,X=
return countId; _]E H~;
} 0l=g$G
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} r)UtS4 7
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CountCache.java th]1>
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/* \yP\@cpY{
* CountCache.java `1aEV#;
* BO)K=gl;8
* Created on 2007年1月1日, 下午5:01 Q^}6GS$
* Goa0OC,
* To change this template, choose Tools | Options and locate the template under [(Ss^?AJW
* the Source Creation and Management node. Right-click the template and choose q^NI
* Open. You can then make changes to the template in the Source Editor. {,61V;Bpm
*/ Khp`KPxz%
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package com.tot.count; Rg@W0Bc)
import java.util.*; !lf'gW
/** X/Umfci
* fR[kjwX)<1
* @author Ni"n_Yun
*/ 1 XsB
public class CountCache { M{M>$pt
public static LinkedList list=new LinkedList(); +72[*_ <
/** Creates a new instance of CountCache */ }Fy~DsQ
public CountCache() {} $KDH"J
public static void add(CountBean cb){ MD`1KC_m
if(cb!=null){ #'s}=i}y"C
list.add(cb); 7L68voC@U
} 0G@sj7)]
} VE3,k'^v
} *UM=EQaYk
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CountControl.java Y v22,|:
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/* 5k /Y7+*?E
* CountThread.java lxsBXX Zg
* |-kU]NJFR
* Created on 2007年1月1日, 下午4:57 N0`v;4gF$]
* Td~CnCor
* To change this template, choose Tools | Options and locate the template under ;.Dm?J0
* the Source Creation and Management node. Right-click the template and choose NJ"
d`
* Open. You can then make changes to the template in the Source Editor. YMGzO
*/ iBlZw%zKP
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package com.tot.count; :v-&}?
import tot.db.DBUtils; @nIoYT='
import java.sql.*; #|\w\MJamP
/** !8'mIXZ$
* g~,"C8-H
* @author 9UF^h{X
*/ JQSp2b@'H
public class CountControl{ 2|Of$oMc
private static long lastExecuteTime=0;//上次更新时间 dw6U}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mRJX,
/** Creates a new instance of CountThread */ /"$A?}V
public CountControl() {} +OGa}9j-
public synchronized void executeUpdate(){ CVo2?ZQ
Connection conn=null; (- ]A1WQ?
PreparedStatement ps=null; P[E:=p
try{ O+ ].'
conn = DBUtils.getConnection(); (A@~]N,U/
conn.setAutoCommit(false); 8HL$y-F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o u%Xnk~
for(int i=0;i<CountCache.list.size();i++){ tXZE@JyuC
CountBean cb=(CountBean)CountCache.list.getFirst();
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CountCache.list.removeFirst(); 1^F
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ps.setInt(1, cb.getCountId()); g>g]qQ
ps.executeUpdate();⑴ Atdr|2
//ps.addBatch();⑵ '!$g<= @
} #2&DDy)Bf
//int [] counts = ps.executeBatch();⑶ q#}#A@Rg
conn.commit(); P;B<R"
}catch(Exception e){ d#Hl3]wT
e.printStackTrace(); 6I5,PB
} finally{ rUg<(/c
try{ $>Y2N5
if(ps!=null) {
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ps.clearParameters(); HLD8W8
ps.close(); 8xAxn+;
ps=null; *<.{sx^Gk
} U/9i'D[|{
}catch(SQLException e){} q\0CS>.
DBUtils.closeConnection(conn); uv&??F]/
} g>L4N.ZH_v
} 25:[VH$:4
public long getLast(){ {=Z xF
return lastExecuteTime; 2hD(zUSy
} HUP~
public void run(){ nU^ -D1s{
long now = System.currentTimeMillis(); .mr&zq
if ((now - lastExecuteTime) > executeSep) { O
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//System.out.print("lastExecuteTime:"+lastExecuteTime); @y"/hh_?
//System.out.print(" now:"+now+"\n"); *wvd[q h
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); FR bmeq3c
lastExecuteTime=now; E.ugr])
executeUpdate(); 6"OwrJB
} [UP-BX(
else{ lKtA.{(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BVJ6U[h`
} ?2RDd|#
} xOKLc!J
} vS@;D7ep
//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 "7G>
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类写好了,下面是在JSP中如下调用。 j=q*b Qr
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<% FV 0x/)<z
CountBean cb=new CountBean(); B4l*]K%
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); [Yi;k,F:
CountCache.add(cb); Lm!/iseGv
out.print(CountCache.list.size()+"<br>"); ,$H[DX
CountControl c=new CountControl(); 80'!XKSP
c.run(); >TKl`O
out.print(CountCache.list.size()+"<br>"); r bfIH":
%>