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: YX||\
>.P/fnvJ
CountBean.java aD
33!
:y
H
l'za
/* (X!?#)fyn
* CountData.java B.zRDB}i=
* d%IM`S;fh
* Created on 2007年1月1日, 下午4:44 wi{qN___
* yrp;G_
* To change this template, choose Tools | Options and locate the template under 6\8
lx|w
* the Source Creation and Management node. Right-click the template and choose s)?=4zJ
* Open. You can then make changes to the template in the Source Editor. P!;%DI!<b
*/ xwSi}.
+ -[M 7J
package com.tot.count; $UgQ1Qc
|
rY.IbL
/** RR*eq.;
* q7itznQSKc
* @author F*&A=@/3
*/ /h/f&3'h
public class CountBean { +`;YK7o
private String countType; u}zCcWP|L
int countId; MMyVm"w
/** Creates a new instance of CountData */ H9 d!-9I
public CountBean() {} Mq!vu!
public void setCountType(String countTypes){ :>@6\
this.countType=countTypes; (}$pf6s
} ;0)|c}n+.5
public void setCountId(int countIds){ *aE/\b
this.countId=countIds; ba=-F4?
} vDGAC'
public String getCountType(){ X\?PnD`,
return countType; J>H$4t#HX
} ;S+UD~i[Bu
public int getCountId(){ &$\B&Hp@
return countId; pS1f y]
} ^A4bsoW
} Ro&s\T+d
4$j7DJ8dj
CountCache.java v[3QI7E3
zz4TJ('
/* Z*9Qeu-N:
* CountCache.java `v]|x,l+C
*
>mk}
* Created on 2007年1月1日, 下午5:01 Z6.0X{6nA
* M
Y2=lT
* To change this template, choose Tools | Options and locate the template under X:aLed_{f
* the Source Creation and Management node. Right-click the template and choose h KZ<PwBi
* Open. You can then make changes to the template in the Source Editor. 73:y&U
*/ .7h:/d
Y:
f!3$xu5
package com.tot.count; Gxtqzr*
import java.util.*;
-tQi~Y[]
/** sZ-A~X@g
* <Cbah%X
* @author B=4xZJPy
*/ MLu@|Xgh
public class CountCache { |)"`v'8>
public static LinkedList list=new LinkedList(); bO)voJ<
/** Creates a new instance of CountCache */ /-in:gX8
public CountCache() {} mz|#K7:
public static void add(CountBean cb){ M_<? <>|
if(cb!=null){ T#HW{3
list.add(cb); E%A] 8y7
} KdBE[A-1^M
} 2X:OS/
} G*oqhep
.(RX;.lw
CountControl.java RDX$Wy$@L
91|0{1
/* OMl<=;^:|
* CountThread.java ws^ 7J/8
* !>n^ ;u
* Created on 2007年1月1日, 下午4:57 il=:T\'U9
* E46+B2_~zk
* To change this template, choose Tools | Options and locate the template under JO|%Vpco
* the Source Creation and Management node. Right-click the template and choose !foiGZ3g
* Open. You can then make changes to the template in the Source Editor. DlD;rL=
*/ !CnkG<5z>
1FkS$ j8:
package com.tot.count; e-4 Qw#cw
import tot.db.DBUtils; &bIE"ZBjt
import java.sql.*; LqDj4[}
/** d*M:PjG@
* X,ES=J0
* @author <k41j=d
*/ n7CwGN%
public class CountControl{ >Y3ZK{b
private static long lastExecuteTime=0;//上次更新时间 JemB[
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Te\i;7;4u
/** Creates a new instance of CountThread */ pGwBhZnb>
public CountControl() {} /=+y[y3`
public synchronized void executeUpdate(){ 53g(:eB
Connection conn=null;
`oPUf!
PreparedStatement ps=null; vv F:
try{ d=*&=r0!C{
conn = DBUtils.getConnection(); @(b;H0r~
conn.setAutoCommit(false); AW\#)Em
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >j%4U*
for(int i=0;i<CountCache.list.size();i++){ km 0LLYG
CountBean cb=(CountBean)CountCache.list.getFirst(); wjRv=[
CountCache.list.removeFirst(); {Rd){ky@
ps.setInt(1, cb.getCountId()); l-~
o&n
ps.executeUpdate();⑴ B%L dH
//ps.addBatch();⑵ oP%'8%tk
} @v:p)|Ne;
//int [] counts = ps.executeBatch();⑶ {&I3qk2(
conn.commit(); dPVl\<L1
}catch(Exception e){ s)eU^4m
e.printStackTrace(); n
_H]*~4F
} finally{ oMw#ROsvC
try{ 3-%F)@n
if(ps!=null) { lk(q>dv K
ps.clearParameters(); Z%_m<Nf8T
ps.close(); $K'A_G^
ps=null; Bh%Yu*.f
} Ga9^+.j
}catch(SQLException e){}
Z'ZN^j{
DBUtils.closeConnection(conn); OqW (C
} {r.yoI4e
} 9[7Gxmf
public long getLast(){ "^3pP(8;~
return lastExecuteTime; Pm}
} A"PmoV?lAm
public void run(){ E5EAk6
long now = System.currentTimeMillis(); q n2X._`
if ((now - lastExecuteTime) > executeSep) { ^CtA@4
//System.out.print("lastExecuteTime:"+lastExecuteTime); 6%8,OOS
//System.out.print(" now:"+now+"\n"); ~,:
FZ1wh
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); gb,X"ODq
lastExecuteTime=now; g5,Bj
executeUpdate(); DFUW^0N
} 3u g-cq
else{ _w\A=6=q|
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); a{deN9Qn
} '
6#en9{L
} Kz`g Q |S
} { :~D
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 pZA0Go2!IN
=u,8(:R]s
类写好了,下面是在JSP中如下调用。 hiM nU
{:!CA/0Jx
<% }-8ZSWog6f
CountBean cb=new CountBean(); 41'|~3\X
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); yo=0Ov
CountCache.add(cb); ZY Ci&l
out.print(CountCache.list.size()+"<br>"); }1)tALA
CountControl c=new CountControl(); 7yDWc m_y
c.run(); G$HXc$OY
out.print(CountCache.list.size()+"<br>"); /GQN34RD
%>