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: ~8l(,N0
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CountBean.java x_VD9
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/* {a6cA=WTPd
* CountData.java r)xkpa5
* 5%)<e-
* Created on 2007年1月1日, 下午4:44 vA"MTncv
* &'KJh+jJ
* To change this template, choose Tools | Options and locate the template under &Ay[mZQ 7
* the Source Creation and Management node. Right-click the template and choose F(}~~EtPHo
* Open. You can then make changes to the template in the Source Editor. +0Z,#b
*/ d.Im{-S
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package com.tot.count; Ef~Ar@4fA
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/** 1r?hRJ:'
* jRGslak;
* @author [ ~&yLccN
*/ `G0GWh)`x
public class CountBean { DElrY)3O.
private String countType; u/_TR;u=q
int countId; xP+`scv*m#
/** Creates a new instance of CountData */ {a9(
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public CountBean() {} J1UG},-h
public void setCountType(String countTypes){ }huFv*<@'
this.countType=countTypes; =IH~:D\&
} @^cR
public void setCountId(int countIds){ ic;M=dsh:
this.countId=countIds; kVe4#LT
}
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public String getCountType(){ !fmbm4!a
return countType; 6Q*Zy[=
} N(Sc!rX
public int getCountId(){ ^gSZzJ5
return countId; aDZ,9}
} N}gPf
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} vN9R.R
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CountCache.java N3(.7mxo
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/* lx\9 Y 8
* CountCache.java cw3j&k
* K;Fs5|gFU
* Created on 2007年1月1日, 下午5:01 .L@gq/x)
* %urd;h D
* To change this template, choose Tools | Options and locate the template under (Cb;=:3G
* the Source Creation and Management node. Right-click the template and choose wQ9?Z.-$
* Open. You can then make changes to the template in the Source Editor. 'W*:9wah
*/ `n?Rxhkwp
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package com.tot.count; Fs(FI\^
import java.util.*; F}~qTF;H
/** `Kbf]"4q
* \,S4-~(:!
* @author 8I[=iU7]l
*/ p1N3AhXY
public class CountCache { +Ly@5y"
public static LinkedList list=new LinkedList(); =}g-N)^
/** Creates a new instance of CountCache */ cq0-Dd9^&
public CountCache() {} ShesJj
public static void add(CountBean cb){ N 9W,p2
if(cb!=null){ X;]Ijha<*
list.add(cb); v\o
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} 8b!xMFF"
} '*B%&QC-
} \ `;1[m
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CountControl.java uJ`:@Z^J
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/* o3$dl`'
* CountThread.java 9ZNzC
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* wk#cJ`wG;
* Created on 2007年1月1日, 下午4:57 Ya4yW9*
* &F:%y(;{Y
* To change this template, choose Tools | Options and locate the template under 22'Ra[
* the Source Creation and Management node. Right-click the template and choose L*OG2liJ
* Open. You can then make changes to the template in the Source Editor. nC(Lr,(
*/ (mplo|>
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package com.tot.count; vi.INe
import tot.db.DBUtils; xR8y"CpE
import java.sql.*; +%H=+fJ2}
/** U1 `pY:P
* Oy b0t|do+
* @author 7K ~)7U
*/ :k-@w5(
public class CountControl{ ep4?;Qmho
private static long lastExecuteTime=0;//上次更新时间 KZO[>qC"R
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &kcmkRRG
/** Creates a new instance of CountThread */ pedyWA>
public CountControl() {} j\"d/{7Q
public synchronized void executeUpdate(){ &c} 2[=
Connection conn=null; Yxy!&hPLv:
PreparedStatement ps=null; 1]9l
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try{ 0"Euf41
conn = DBUtils.getConnection(); [nG[ x|;|
conn.setAutoCommit(false); 4V;-*:
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ [kTckZv
CountBean cb=(CountBean)CountCache.list.getFirst(); _DAqL@5n
CountCache.list.removeFirst(); /E3~z0
ps.setInt(1, cb.getCountId()); (&u'S+
ps.executeUpdate();⑴ M2;6Cz>,P
//ps.addBatch();⑵ zK I1
} #3tC"2MZ
//int [] counts = ps.executeBatch();⑶ p"7[heExw
conn.commit(); r&ys?@+G
}catch(Exception e){ nN^lY=3
e.printStackTrace(); .s?^y+e_
} finally{ 'MW O3
try{ 24
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if(ps!=null) { R\Ckk;<$
ps.clearParameters(); oIQ$98 M
ps.close(); Q5l+-
ps=null; .|Yn[?(
} G*,7pc
}catch(SQLException e){}
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DBUtils.closeConnection(conn); $Yp.BE<}
} u?rX:KkS
} pe>?m ^gz[
public long getLast(){ X 4!Jj*
return lastExecuteTime; o?cNH
} So75h*e
public void run(){ 4)>S3Yr
long now = System.currentTimeMillis(); .XVL JJ#
if ((now - lastExecuteTime) > executeSep) { g3yZi7b5FU
//System.out.print("lastExecuteTime:"+lastExecuteTime); O4:_c-V2
//System.out.print(" now:"+now+"\n"); 2[j`bYNe
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); yqtaQ0F~
lastExecuteTime=now; 0P!Fci/t
executeUpdate(); th<>%e}5c
} @,}tY ?>a
else{ Pp_? z0M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 1~},}S]id
} 3lEP:Jp
} (uy\~Zb
} F~hH>BH9
//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 P}>>$$b\Yi
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类写好了,下面是在JSP中如下调用。 }W(t>>
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<% #/8
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CountBean cb=new CountBean(); g:!R't?
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); sY?wQ:
CountCache.add(cb); ,7DyTeMpN
out.print(CountCache.list.size()+"<br>"); !4<A|$mQ
CountControl c=new CountControl(); Y7 K2@257
c.run(); Fey^hx
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out.print(CountCache.list.size()+"<br>"); .u=|h3&
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