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: 0t) IWD
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CountBean.java .}tL:^'~o
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/* &c]x;#-y
* CountData.java ;j$84o{
* *q^'%'
* Created on 2007年1月1日, 下午4:44 !MbRI
* $z<CkMP!U7
* To change this template, choose Tools | Options and locate the template under ^C(AMT
* the Source Creation and Management node. Right-click the template and choose _7Z$"
* Open. You can then make changes to the template in the Source Editor. 9DIG K\
*/ L8V'mUyD
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package com.tot.count; KT3[{lr
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/** ?}W:DGudZ
* ?B-aj
* @author w:qwU\U>x
*/ .N%$I6w
public class CountBean { Z8m/8M
private String countType; m+o>`1>a
int countId; LcF0: h'
/** Creates a new instance of CountData */ m_pK'jc
public CountBean() {} @FQ@*XD
public void setCountType(String countTypes){ &?~> I[^~
this.countType=countTypes; -/h$Yb
} , 7}Ri
public void setCountId(int countIds){ 4F'@yi^Gt
this.countId=countIds; @gZ%>qe
} IRpCbTIXK
public String getCountType(){ }\1V;T
return countType; 46mu,v
} Fr3Q"(
public int getCountId(){ qWWy}5SOm
return countId; C4b3ZcD2
} UOa{J|k>h
} cM55
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CountCache.java b7\nCRY
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/* le*pd+> j
* CountCache.java W] RxRdY6[
* d@C93VYp
* Created on 2007年1月1日, 下午5:01 L:~
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* M,l
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* To change this template, choose Tools | Options and locate the template under NWTsL OIm
* the Source Creation and Management node. Right-click the template and choose #KiRH* giU
* Open. You can then make changes to the template in the Source Editor. ^fRA$t
*/ ~V (WD;Mk
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package com.tot.count; ](^xA`
import java.util.*; ]E,
/** =s;7T!7!
* $[IuEdc/
* @author _v_ak4m>
*/ +|^rz#X
public class CountCache { P}cGWfj
public static LinkedList list=new LinkedList(); d~qDQ6!
/** Creates a new instance of CountCache */ m,-:(82
public CountCache() {} vh((HS-)
public static void add(CountBean cb){ K !`t EW[
if(cb!=null){ :[,n`0lH
list.add(cb); Cfa?LgSz
} <x,$ODso
} {"O'kx
} si)920?E&
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CountControl.java ~]}7|VN.}
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/* i/~A7\:8%
* CountThread.java 92XzbbLp
* uQrD}%GI
* Created on 2007年1月1日, 下午4:57 P.LMu
* vX&Nh"0H&
* To change this template, choose Tools | Options and locate the template under mlX^5h'
* the Source Creation and Management node. Right-click the template and choose Fz-Bd*uS
* Open. You can then make changes to the template in the Source Editor. o ;.j_
*/ $n!saPpxS
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package com.tot.count; ij/ |~-!
import tot.db.DBUtils; @ 3FTf"#Y
import java.sql.*; ![ Fb~Egc
/** 7?e*b(vd
* MH1??vW
* @author uTngDk
*/ (J5E]NV
public class CountControl{ =ejkE;
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private static long lastExecuteTime=0;//上次更新时间 S$ dFz
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Q!MS_
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/** Creates a new instance of CountThread */ YS%HZFY, "
public CountControl() {} 2B5Z0<
public synchronized void executeUpdate(){ m%l\EE
Connection conn=null; ,{7Z OzA
PreparedStatement ps=null; 8h}o5B
try{ | M4_@P
conn = DBUtils.getConnection(); 9>%ti&_-jt
conn.setAutoCommit(false); JuS#p5E #
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); u1(`^^Ml
for(int i=0;i<CountCache.list.size();i++){ y?;&(Tcbt8
CountBean cb=(CountBean)CountCache.list.getFirst(); eA4@)6W P(
CountCache.list.removeFirst(); f8!*4Bw
ps.setInt(1, cb.getCountId()); b<NI6z8\
ps.executeUpdate();⑴ 3`$-
//ps.addBatch();⑵ K'Wg_ihA
} +,f|Y6L<