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: &Hp*A^M
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CountBean.java 5?` 4qSUz
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/* LJ@(jO{z
* CountData.java +`Q]p "G
* "Tser*i )
* Created on 2007年1月1日, 下午4:44 2@Yu:|d4U
* .lb]Xa*n
* To change this template, choose Tools | Options and locate the template under K2x2Y=
* the Source Creation and Management node. Right-click the template and choose QK6_dIvDz
* Open. You can then make changes to the template in the Source Editor. q1u$Sm
*/ 4w ,L
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package com.tot.count; X:Wd%CHP
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/**
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* H}~K51
* @author SF;\*]["f
*/ zW#5 /*@
public class CountBean { fn
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private String countType; ]vf0 f,F
int countId; 3>7{Q_5
/** Creates a new instance of CountData */ auAz>6L
public CountBean() {} MnFrQC
public void setCountType(String countTypes){ hu0z
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this.countType=countTypes; _J,rql@nG<
} +d=f_@i
public void setCountId(int countIds){ na
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this.countId=countIds; Xn=yC Pi
} Q?1.GuF
public String getCountType(){ WcSvw
return countType; \K\eq>@6
} R7(XDX=[s
public int getCountId(){ &PV%=/-J
return countId; Xykoq"dbb
} ^"|q~2
} Ey:?!
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CountCache.java \jk*Nm8;
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/* t^MTR6y+8
* CountCache.java AcnY6:3Y|
* }G{"Mp4
* Created on 2007年1月1日, 下午5:01 Rq+7&%dy
* BV@q@C
* To change this template, choose Tools | Options and locate the template under w=_^n]`R
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. ,^e2ma|z
*/ >2>/
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package com.tot.count; q%d'pF
import java.util.*; ?m~1b_@A{
/** 08jk~$%
* u
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* @author \e4AxLP
*/ }U'9 d#N
public class CountCache { 9a=:e=q3#
public static LinkedList list=new LinkedList(); =gSc{ i|
/** Creates a new instance of CountCache */
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public CountCache() {} VOr:G85*s
public static void add(CountBean cb){ ~tfd9,t
if(cb!=null){ 3s%DF,
list.add(cb); d:>^]5cE&
} U5j4iz'
} bnkZWw'9
} *FEJ5x
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CountControl.java *ilVkV"U
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/* }[|9vF"g.y
* CountThread.java [g}#R#Y)
* L7<30"7
* Created on 2007年1月1日, 下午4:57 `-U?{U}H
* 6B@e[VtG$
* To change this template, choose Tools | Options and locate the template under YBj*c$.D0
* the Source Creation and Management node. Right-click the template and choose %`s#p` Ol1
* Open. You can then make changes to the template in the Source Editor. R%n*wGi_6b
*/ ]XlBV-@b
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package com.tot.count; ,OwTi:yDr
import tot.db.DBUtils; b7^q(}qE
import java.sql.*; qm/>\4eLt
/** +@fEw
* B2$cY;LH
* @author sM)1w-
*/ qY%|Uo
public class CountControl{ |H5GWZ
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private static long lastExecuteTime=0;//上次更新时间 TtrO _D
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Ms5qQ<0v_
/** Creates a new instance of CountThread */ $s1/Rmw
public CountControl() {} Q}\\0ajS)
public synchronized void executeUpdate(){ q,7W,<-
Connection conn=null; whw+
PreparedStatement ps=null; 1O0)+9T82
try{ Q'=7#_
conn = DBUtils.getConnection(); gp$]0~[tO
conn.setAutoCommit(false); 1(T2:N(M-A
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); p9G+la~;VM
for(int i=0;i<CountCache.list.size();i++){ 3
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CountBean cb=(CountBean)CountCache.list.getFirst(); Ii}{{1N6
CountCache.list.removeFirst(); go=xx.WJ
ps.setInt(1, cb.getCountId()); yR{rje*
ps.executeUpdate();⑴ (p#c p
//ps.addBatch();⑵ &Hf%Va[B
} ddl]!
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//int [] counts = ps.executeBatch();⑶ CIo`;jt K
conn.commit(); $ Lfbt=f
}catch(Exception e){ X4\T=Q?uLx
e.printStackTrace(); Or$"f3gq
} finally{ v]@ XyF\j8
try{ oVP,ar0G
if(ps!=null) { T[e+iv<8j
ps.clearParameters(); sF :pwI5^
ps.close(); v~AshmP
ps=null; k
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} I_Lm[
}catch(SQLException e){} :/SGB3gb1t
DBUtils.closeConnection(conn); X7K{P_5l
} I8@leT\9M
} J3 oUtu
public long getLast(){ n4{?Odrf
return lastExecuteTime; 4IOqSB|
} CTg79
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public void run(){ l{3zlXk3z
long now = System.currentTimeMillis(); n?6^j8i
if ((now - lastExecuteTime) > executeSep) { -0;{
//System.out.print("lastExecuteTime:"+lastExecuteTime); !Y|xu07
//System.out.print(" now:"+now+"\n"); )R<93`q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); xa_ IdkV
lastExecuteTime=now; wO!>kc<
executeUpdate(); v0&D