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-nwo:OA
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CountBean.java ~`#.ZMO
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/* Y5-X)f
* CountData.java 'an{<82i
* YJuaQxs
* Created on 2007年1月1日, 下午4:44 kmy?`P10(z
* GL@s~_;T6
* To change this template, choose Tools | Options and locate the template under 0+/L?J3
* the Source Creation and Management node. Right-click the template and choose <z#r3J
* Open. You can then make changes to the template in the Source Editor. C0 .Xp
*/ c500:OSB
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package com.tot.count; B6 x5E
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/** |QAmN>7U
* 8<^[xe
* @author }.NR+:0
*/ 18}L89S>
public class CountBean { bsr
private String countType; (^qcX;-
int countId; r4J4|&ym
/** Creates a new instance of CountData */ #E^ %h
public CountBean() {} pP{b!1
public void setCountType(String countTypes){ e:AB!k^xp$
this.countType=countTypes; xE9^4-Px*
} FDbx"%A
public void setCountId(int countIds){ $
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this.countId=countIds; ^dZ,Itho
} g|"z'_
public String getCountType(){ >Eik>dQ a
return countType; HjGT{o
} /p<mD-:.M
public int getCountId(){ ^P"t
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return countId; a+A/l
} BR*""/3`
} $]|_xG-6{
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CountCache.java y|.wL=;
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/* 5c{=/}Y
* CountCache.java XwX1i!'54
* "y
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* Created on 2007年1月1日, 下午5:01 hYi-F.Qtq
* Z6K9E=%)c
* To change this template, choose Tools | Options and locate the template under >8t(qM-~:
* the Source Creation and Management node. Right-click the template and choose *:BNLM
* Open. You can then make changes to the template in the Source Editor. 49/1#^T"Q>
*/ dXe763~<
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package com.tot.count; m1\>v?=K
import java.util.*; XiKv2vwA
/** {EW}Wd
* }mu8fm'
* @author dam.D.o"
*/ "9LPq
public class CountCache { `dEWP;#cp
public static LinkedList list=new LinkedList(); [<wy@W
/** Creates a new instance of CountCache */ /PPk
p9H{
public CountCache() {} BAX])~_
public static void add(CountBean cb){ bTO$B2eh|
if(cb!=null){ d`({z]W;
list.add(cb); fkRb;aIl
} <u4GIi
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} &bBp`h
} h=`rZC
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CountControl.java j|lg&kN
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/* *$`r)pV%AK
* CountThread.java 1 68U-<
* F
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* Created on 2007年1月1日, 下午4:57 G?3S_3J2
* u:g(x+u4:
* To change this template, choose Tools | Options and locate the template under "Hgn2o.;5
* the Source Creation and Management node. Right-click the template and choose "q#(}1Zd
* Open. You can then make changes to the template in the Source Editor. Bfi9%:eG
*/ N#T MU
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package com.tot.count; 8f8+3
import tot.db.DBUtils; -7=pb#y
import java.sql.*; Kz$Ijj
/** ip1jY!
* F4bF&% R
* @author '\_ic=&u
*/ pKr3(5~
public class CountControl{ JXPn
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private static long lastExecuteTime=0;//上次更新时间 @o;m!CYB
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 >x!N[N@G
/** Creates a new instance of CountThread */ (&njZdcb*
public CountControl() {} 61jDI^:
public synchronized void executeUpdate(){ 6|_ S|N
Connection conn=null; V#3VRh
PreparedStatement ps=null; T0tG1/O\
try{ !Z4,UTu|Q
conn = DBUtils.getConnection(); ?$
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conn.setAutoCommit(false); ?KS9Dh
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *}[@*
for(int i=0;i<CountCache.list.size();i++){ M~"]h:m&'v
CountBean cb=(CountBean)CountCache.list.getFirst(); hrS/3c'<Z
CountCache.list.removeFirst(); ~x4Y57
ps.setInt(1, cb.getCountId()); D+ jk0*bJ
ps.executeUpdate();⑴ {qOSs,+=L
//ps.addBatch();⑵ T}u '
} 1$Eiv8xd
//int [] counts = ps.executeBatch();⑶ l#Qf8*0
conn.commit(); }$$b6G
}catch(Exception e){ c-M&cU+=L
e.printStackTrace(); U(J?Q
} finally{ y{v*iH<
try{ =#y&xWxL