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: ioYGZ%RG#
,N!o
CountBean.java L)@?e?9
M<kj_.
/* BT}!W`
* CountData.java 3E!|<q$z
* 45,1-? -!
* Created on 2007年1月1日, 下午4:44 >`A9[`$n
* n:yTeZ=-s4
* To change this template, choose Tools | Options and locate the template under DXJ`oh
* the Source Creation and Management node. Right-click the template and choose
ll`>FcQ
* Open. You can then make changes to the template in the Source Editor. uBNn6j
*/ 23RN}LUi
Rm255zp
package com.tot.count; -uMSe~
L.S;J[a;
/** " @v <Bk
* p<,*3huj
* @author M$/|)U'W
*/ ^j31S*f&:
public class CountBean { +^=8ge}
private String countType; 56zL"TF`
int countId; UA48Ug
/** Creates a new instance of CountData */ *>n;SuT_
public CountBean() {} {>DEsO
public void setCountType(String countTypes){ qz0;p=$8Z
this.countType=countTypes; Y]/%t{Y
} ,
udTvI
public void setCountId(int countIds){ }bdmomV
this.countId=countIds; W-?()dX{
} E5I"%9X0H
public String getCountType(){ ms*(9l.hOK
return countType; I%sFqh>
} U%q7Ai7
public int getCountId(){ =kJ,%\E`
return countId; :h\Q;?
} ?o81E2TJO
} gW)3e1a
a@@)6FM
CountCache.java KH(%?
gMWjk7
/* <}<zgOT[1!
* CountCache.java cx&>#8s&
* }o(zj=7
* Created on 2007年1月1日, 下午5:01 Ye2 {f"F
* _AAaC_q
* To change this template, choose Tools | Options and locate the template under !g5xq
* the Source Creation and Management node. Right-click the template and choose bpH^:fyLU`
* Open. You can then make changes to the template in the Source Editor. vms|x wb
*/ $~VRza 8Q
K
1 a\b"
package com.tot.count; lij.N)E
import java.util.*; bdC8zDD
/** mS(fgq6
* b{L/4bu
* @author r:f[mk"-"A
*/ S-
pV_Ff
public class CountCache { K/i*w<aPb7
public static LinkedList list=new LinkedList(); 1FlX'[vh
/** Creates a new instance of CountCache */ U+:m4a
public CountCache() {} _+K_5IO4
public static void add(CountBean cb){ >7I15U
if(cb!=null){ 1*'HL#
list.add(cb); *>|gxM8
} +
+M$#Er&
} 'ig&$fz b
} #_6I w`0
Q=AavKn#
CountControl.java :S<f?*
}:
gl\\+VyU
/* /?@3.3sl_
* CountThread.java pGJ>O/%
* uE%r/:!k4$
* Created on 2007年1月1日, 下午4:57 ([SU:F!uW(
* }001K
* To change this template, choose Tools | Options and locate the template under sf)EMh3Z
* the Source Creation and Management node. Right-click the template and choose L ^q""[
* Open. You can then make changes to the template in the Source Editor. w80oXXs[#
*/ l_o@miG/
}+.}J
package com.tot.count; [x+FcXb
import tot.db.DBUtils; +S>j0m<*
import java.sql.*; Al}6q{E9+8
/** cAY: AtD
* _ FpTFfB
* @author ad*m%9Y1Q
*/ W-mQjJ`,B
public class CountControl{ B:'J`M"N
private static long lastExecuteTime=0;//上次更新时间 41`n1:-]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 R=gb'
/** Creates a new instance of CountThread */ lR )67a
public CountControl() {} .E`\MtA
public synchronized void executeUpdate(){ |bTPtrT8
Connection conn=null; G`cHCP_n
PreparedStatement ps=null; ZA0mz 65
try{ vHyC; 4'
conn = DBUtils.getConnection(); zHA!%>%'
conn.setAutoCommit(false); 6 :b!F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); qTdh eX/
for(int i=0;i<CountCache.list.size();i++){ TE3lK(f
CountBean cb=(CountBean)CountCache.list.getFirst(); d,+Hd2o^X
CountCache.list.removeFirst(); B2>H_dmQ
ps.setInt(1, cb.getCountId()); ;LcZ`1
ps.executeUpdate();⑴ 3EJj9}#x"'
//ps.addBatch();⑵ G<}()+L
} ?zh9d%R
//int [] counts = ps.executeBatch();⑶ A\4D79>x
conn.commit(); -ws? "_w
}catch(Exception e){ \k .{-nh
e.printStackTrace(); B<5R
} finally{ X{5vXT\/y
try{ S\:P-&dC
if(ps!=null) { ZP@
$Q%up
ps.clearParameters(); >0/i[k-dk
ps.close(); q!.byrod
ps=null; )
i;1*jK
} 4 ezEW|S
}catch(SQLException e){} _
TiuY
DBUtils.closeConnection(conn); wH>a~C:
} VCV"S>aVf
} Q-_N2W?
public long getLast(){ CAfGH!l!
return lastExecuteTime; ((H^2KJn
} t<#TJ>Le
public void run(){ th
long now = System.currentTimeMillis(); O#ai)e_uQk
if ((now - lastExecuteTime) > executeSep) { ??^5;P{yx
//System.out.print("lastExecuteTime:"+lastExecuteTime); GWZ
}7ake
//System.out.print(" now:"+now+"\n"); uxXBEq;
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); J%u=Ucdh
lastExecuteTime=now; smlpD3?va
executeUpdate(); s^Y"' ` +
} q
?|,O;?
else{ |cK*~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); r+A{JHnN
} Vc 1\i
} 00(on28b
} cr%"$1sY;
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 gwLf '
YmL06<Mh
类写好了,下面是在JSP中如下调用。 NP0\i1P>.?
T$>WE= Y
<% 9]k @Q_
CountBean cb=new CountBean(); h}[-'>{
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); e%svrJ2
CountCache.add(cb); eWCb73
out.print(CountCache.list.size()+"<br>"); `#rL*;\uV
CountControl c=new CountControl(); joFm]3$;
c.run(); ,f~J`3(&
out.print(CountCache.list.size()+"<br>"); qB5j;@r
%>