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: ?x|8"*N
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CountBean.java mrzrQ@sN
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/* g0P^O@8
* CountData.java AI|8E8h+D
* o6PDCaT7
* Created on 2007年1月1日, 下午4:44 Tjfg[Z/x
* 8d90B9
* To change this template, choose Tools | Options and locate the template under &{Zt(%\ '
* the Source Creation and Management node. Right-click the template and choose ,&1DKx
* Open. You can then make changes to the template in the Source Editor. d&dp#)._8
*/ /"Bm1
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package com.tot.count; $:#{Y;d
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/** }CiB+
* %YI Xk1
* @author =2
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*/ CO`%eL~
public class CountBean { V?a+u7*U&
private String countType; b0A*zQA_)
int countId; UKBVCAK
/** Creates a new instance of CountData */ }w0>mA0=H
public CountBean() {} G/2| *H
public void setCountType(String countTypes){ i,{'}B
this.countType=countTypes; x>?jfN,e
} >>**n9\q
public void setCountId(int countIds){ ndIf1}
this.countId=countIds; 3 9|4)1e
} bvf}r
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public String getCountType(){ )jh4HMvmC
return countType; D ]H@Sx
} U9d0nj9 j
public int getCountId(){ W3XVr&
return countId; [/s^(2%
} CMm:Vea
} kIb)I(n
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CountCache.java iBq|]
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/* SD "'
* CountCache.java Ye '=F
* x*G-?Xza)
* Created on 2007年1月1日, 下午5:01 dPdodjSu,!
* GWNLET
* To change this template, choose Tools | Options and locate the template under l Ikh4T6i
* the Source Creation and Management node. Right-click the template and choose {xw"t9(fE
* Open. You can then make changes to the template in the Source Editor. Rn(vG-xQ
*/ z%Xz*uu(|
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package com.tot.count; =@ '>|-w|
import java.util.*; X*'tJN$
/** `uO(#au,U
* IA\CBwiLj
* @author O>Vb7`z0<
*/ \"]vSx>
public class CountCache { S1iF1X(+?X
public static LinkedList list=new LinkedList(); hPs7mnSW
/** Creates a new instance of CountCache */ tSr.0'CE
public CountCache() {} )%4%Uo_Xm
public static void add(CountBean cb){ 6*] g)m
if(cb!=null){ "k)}qI{
list.add(cb); Osb#<9{}
} :u%Jrc(W
} td:GZ %
} kEH(\3,l
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CountControl.java j4ARGkK5B
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/* bbDl?m&bq
* CountThread.java 8i H'cX
* ax]Pa*C}
* Created on 2007年1月1日, 下午4:57 %S G**7
* z|w@eQ",
* To change this template, choose Tools | Options and locate the template under uM!$`JN
* the Source Creation and Management node. Right-click the template and choose F~;G[6}
* Open. You can then make changes to the template in the Source Editor. 39xA h*}G]
*/ )ZU)$dJ>V
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package com.tot.count; C@{#OOa
import tot.db.DBUtils; |i)7jG<
import java.sql.*; Lci SQ
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/** LL|uMe"Jb
* AY{-Hf&
* @author 9~bl
*/ PGaB U3
public class CountControl{ K%Dksx7ow
private static long lastExecuteTime=0;//上次更新时间 i+x$Y)=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 G~SgI>Q
/** Creates a new instance of CountThread */ [^rT: %Z
public CountControl() {} [0M2`x4`
public synchronized void executeUpdate(){ 4fK(<2i
Connection conn=null; > 3<P^-9L
PreparedStatement ps=null; Q}pnb3J>T
try{ ' }G!D
conn = DBUtils.getConnection(); ^hG
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conn.setAutoCommit(false); _0~WT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); "|{3V:e>a
for(int i=0;i<CountCache.list.size();i++){ <r6e23
CountBean cb=(CountBean)CountCache.list.getFirst(); {fwA=J9%KS
CountCache.list.removeFirst(); {[r}&^K15
ps.setInt(1, cb.getCountId()); 2E
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ps.executeUpdate();⑴ (zW;&A
//ps.addBatch();⑵ ;.Lf9XJ
} hxIG0d!o
//int [] counts = ps.executeBatch();⑶ _/@VV5Mq
conn.commit(); F\' ^DtB
}catch(Exception e){ mN5`Fct*A>
e.printStackTrace(); WD wW`
} finally{ e(;1XqLM
try{ z:RclDm
if(ps!=null) { t<_Jx<{2
ps.clearParameters(); :lF[k`S T
ps.close(); /i$-ws-
ps=null; _cz&f