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: Y$q--JA
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CountBean.java q[Y*.%~
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/* @(st![i+
* CountData.java %gEfG#S
* ilj9&.isB
* Created on 2007年1月1日, 下午4:44 ,J-YfL^x6*
* !ImtnU}
* To change this template, choose Tools | Options and locate the template under e3&.RrA
* the Source Creation and Management node. Right-click the template and choose Yi"jj;!^S
* Open. You can then make changes to the template in the Source Editor. YsjTC$Tx,
*/ WAw} ?&k
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package com.tot.count; ?6^KY+ 5`C
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/** k3"Y!Uha:
* r+l3J>:K
* @author == i?lbj
*/ Z"<tEOs/En
public class CountBean { s2+s1%^Ll
private String countType; Jqi^Z*PuX
int countId; r`'n3#O*
/** Creates a new instance of CountData */ *$7c||J7
public CountBean() {} ?Da!QH
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public void setCountType(String countTypes){ ,}#l0BY
this.countType=countTypes; g*#.yC1/
} VJ(#FA2
public void setCountId(int countIds){ *FUbKr0
this.countId=countIds; j1,ir
} bc|DC,n?
public String getCountType(){ t7DT5SrR
return countType; Go_~8w0<
} 1vBXO bk
public int getCountId(){ |P]>[}mD
return countId; ;/Dp
} F.JvMy3
} 5zF7yvS.w
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CountCache.java paW7.~3
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/* !8O*)=RA
* CountCache.java ~O}LAzGb
* 9IC|2w66
* Created on 2007年1月1日, 下午5:01 5}4r'P$m:
* %9A6c(L
* To change this template, choose Tools | Options and locate the template under >{^&;$G+*
* the Source Creation and Management node. Right-click the template and choose XaV h.
* Open. You can then make changes to the template in the Source Editor. IPoNAi<b
*/ N?h=Zl|
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package com.tot.count; /t083
import java.util.*; 8I'c83w
/** t .&YD x
* x\Bl^1&
* @author RAQi&?Ko
*/ X99:/3MXB'
public class CountCache { 7N/v
public static LinkedList list=new LinkedList(); XOzd{
/** Creates a new instance of CountCache */ ?j{LE-(
public CountCache() {} k!K}<sX2
public static void add(CountBean cb){ eFUJASc
if(cb!=null){ "3A.x1uQ
list.add(cb); D0D0=s
} ~
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} }^;Tt-*k
} u|.L73<j%
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CountControl.java jX79Nm|
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/* LoQm&3/
* CountThread.java gf^"sfNk
* t8,s]I&
* Created on 2007年1月1日, 下午4:57 ,mR$YT8
* y-gSal
* To change this template, choose Tools | Options and locate the template under Re**)3#gn
* the Source Creation and Management node. Right-click the template and choose L<encPJt
* Open. You can then make changes to the template in the Source Editor. E=.4(J7K
*/ _4VF>#b
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package com.tot.count; y,i:BQJ<
import tot.db.DBUtils; {%ZD^YSA
import java.sql.*; E`3yf9"
/** IPK.
* tY^ MP5*
* @author KPIc?|o/6
*/ )54;YK
public class CountControl{ lL.3$Rp;
private static long lastExecuteTime=0;//上次更新时间 c0.i
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 8jW"8~Y#0
/** Creates a new instance of CountThread */ M}E0Msq_o
public CountControl() {} h0ufl.N_%
public synchronized void executeUpdate(){ 5T)qn`%
Connection conn=null; PMzPe"3M
PreparedStatement ps=null; kGsd3t!'
try{ ~wmc5L/!?
conn = DBUtils.getConnection(); #;59THdtPk
conn.setAutoCommit(false); Zi5d"V[}T
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); RM8p[lfX
for(int i=0;i<CountCache.list.size();i++){ j3`#v3
CountBean cb=(CountBean)CountCache.list.getFirst(); ] RgLTqv4x
CountCache.list.removeFirst(); x#ub % t
ps.setInt(1, cb.getCountId()); cs[_5r&:
ps.executeUpdate();⑴ f$vWi&(
//ps.addBatch();⑵ bkfwsYZx
} tJ>|t hk
//int [] counts = ps.executeBatch();⑶ x_&=IyU0j
conn.commit(); q 65mR!)
}catch(Exception e){ S&]AIG)
e.printStackTrace(); UruD&=AMK
} finally{ $e66j V
try{ }TjiYA.
if(ps!=null) { AnK-\4
ps.clearParameters(); P%`|Tu!B
ps.close(); 7?Vo([8
ps=null; y{CyjYpz^
} <i9pJGW
}catch(SQLException e){} #jdo54-
DBUtils.closeConnection(conn); \LX!n!@
} M{ #
} u2=gG.
public long getLast(){ m/W0vPM1
return lastExecuteTime; ,})x1y
} "Uy==~
public void run(){ )Ih'0>=
long now = System.currentTimeMillis(); 6- H81y3
if ((now - lastExecuteTime) > executeSep) { Y{yN*9a79
//System.out.print("lastExecuteTime:"+lastExecuteTime); c5~d^
//System.out.print(" now:"+now+"\n"); 3,qq\gxB
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 4j9
lastExecuteTime=now; lLD-QO}/
executeUpdate(); " jefB6k9h
} !Gwf"-TQ
else{ P$4h_dw
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); BPAz.K Q
} BzFD_A>j;_
} +QS7F`O
} -
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//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 =Rnx!E
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类写好了,下面是在JSP中如下调用。 ^fj):n5/
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<% _H#l&bL@C
CountBean cb=new CountBean(); w3j51v` 0'
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); @D.]PZf
CountCache.add(cb); MZ_+doN
out.print(CountCache.list.size()+"<br>"); b"Ep?=*5
CountControl c=new CountControl(); z!09vDB^
c.run(); ~'/I[y4t
out.print(CountCache.list.size()+"<br>"); 7Gb(&'n
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