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: ?gjx7TQ?
'4Qsl~[Eh
CountBean.java o?a3hD
"J+4
/* 0?gHRdU"
* CountData.java L2~'Z'q
* T"gk^.
* Created on 2007年1月1日, 下午4:44 a1_ o
* 6Q_A-X3hk
* To change this template, choose Tools | Options and locate the template under ev_' .t'
* the Source Creation and Management node. Right-click the template and choose Q[|*P ] w
* Open. You can then make changes to the template in the Source Editor. H3ovF
*/ $p$p C/:%
Y}<%~z#.4
package com.tot.count; YV@efPy}n
B##X94aTT
/** Z;RUxe|<k
* mF jM6pmo
* @author AS;qJ)JfzQ
*/
@';.$
public class CountBean { Aq3\Q>klH)
private String countType; &Vgpv#&Cfx
int countId; 'V&Uh]>
/** Creates a new instance of CountData */ *vvm8ik
public CountBean() {} Np r u
public void setCountType(String countTypes){ >'.: Acn
this.countType=countTypes; rzLW@k
} zEukEA^9`
public void setCountId(int countIds){ {s*2d P)
this.countId=countIds; !=a]Awr\
} \^RKb-6n
public String getCountType(){ UF*R1{
return countType; P~iZae
} ',LC!^:~Nw
public int getCountId(){ ?#z<<FR
return countId; ._`rh
} &oy')\H
} W7!iYxO
w1aoEo "S
CountCache.java ylQj2B,CB
SO[ u4b_"h
/* xk7Dx}
* CountCache.java *kYGXT,f]
* N#t`ZC&m'
* Created on 2007年1月1日, 下午5:01 MtN!Xx
* $60`Hh 4/
* To change this template, choose Tools | Options and locate the template under >V)"TZH
* the Source Creation and Management node. Right-click the template and choose gw[Eu>I
* Open. You can then make changes to the template in the Source Editor. n^O!93a
*/ ,u)jZ7
H6|eUU[&
package com.tot.count; =adHP|S
import java.util.*; IAq
o(Qm
/** Y#~A":A
* a'dlAda
* @author a_?b<
*/ R*6B@<p,i
public class CountCache { /wt7KL-I
public static LinkedList list=new LinkedList(); \x]\W#C
/** Creates a new instance of CountCache */ PJe_qP
public CountCache() {} Z*UVbyC
public static void add(CountBean cb){ Vp|?R65S*
if(cb!=null){ gt02Csdt
list.add(cb); ;+6><O!G
} &);P|v`8
} kV4Oq.E
} 3JBXGT0gJ
6ST(=X_C
CountControl.java nhjT2Sl
C])s'XTs
/* IOdxMzF`m
* CountThread.java C1UU v=|
* ugE!EEy[^
* Created on 2007年1月1日, 下午4:57 ubOXEkZ8N
* 2{vAs
* To change this template, choose Tools | Options and locate the template under [Z#Sj=z
* the Source Creation and Management node. Right-click the template and choose 5\#I4\
* Open. You can then make changes to the template in the Source Editor. >0<n%V#s:r
*/ 5Pn.c!
%DXBl:!Y`
package com.tot.count; A8Fe@$<#8
import tot.db.DBUtils; Vdd
import java.sql.*; HK~SD:d
/** s*<T'0&w0S
* )`R}@(r.
* @author %!(C?k!\
*/ PM#3N2?|E
public class CountControl{ /WE\0bf
private static long lastExecuteTime=0;//上次更新时间 *vuI'EbM
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5rdB>8W
/** Creates a new instance of CountThread */ CEc(2q+%i
public CountControl() {} ]77f`<q<}!
public synchronized void executeUpdate(){ [WG\wj.
Connection conn=null; *qk7e[IP
PreparedStatement ps=null; JcmJq
fR
try{ 9 i/
(
conn = DBUtils.getConnection(); bp=r]nO
conn.setAutoCommit(false); 4R\jZ@D
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); jHn7H)F8
for(int i=0;i<CountCache.list.size();i++){ %]DA4W
CountBean cb=(CountBean)CountCache.list.getFirst(); =&$z
Nc4h
CountCache.list.removeFirst(); cGgfCF^`
ps.setInt(1, cb.getCountId()); c$7~EP
ps.executeUpdate();⑴ gK({InOP
//ps.addBatch();⑵ KU9FHN
} }YFM40H
//int [] counts = ps.executeBatch();⑶ Mh5>
hD
conn.commit(); Q[rZ1z
}catch(Exception e){ UF#!6"C@
e.printStackTrace(); jga \Ry=nw
} finally{ 9,`i[Dzp
try{ rVoV@,P
if(ps!=null) { T>rmm7F
ps.clearParameters(); V@#oQi*
ps.close(); PDuBf&/e
ps=null; ~i>DF`w$
} %\T,=9tD\
}catch(SQLException e){} K3[+L`pz
DBUtils.closeConnection(conn); ~h;
} 4d PTrBQ?
} d9;&Y?fp
public long getLast(){ &|#[.ti1
return lastExecuteTime; B#jnM~fJz
} nv@z;#&
public void run(){ k)S1Z s~G
long now = System.currentTimeMillis(); 0
h!Du|?
if ((now - lastExecuteTime) > executeSep) { L#byYB;E{
//System.out.print("lastExecuteTime:"+lastExecuteTime); T[k$ [
//System.out.print(" now:"+now+"\n"); |y eQz
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pQ:^ ziwa3
lastExecuteTime=now; 1Ng.Ukb
executeUpdate(); .
c+m(Pk
} 0ck3II
else{ i:0v6d
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {eaR,d~X
} k!0O[U
} g}D)MlXRq
} nco.j:
//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 L4m Vk
4i)5=H
类写好了,下面是在JSP中如下调用。 Jp]?tlT
KxX [8
<% yef\Y3X
CountBean cb=new CountBean(); U,EoCAm>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2RX]~}
CountCache.add(cb); b^h_`
out.print(CountCache.list.size()+"<br>"); a- rR`
CountControl c=new CountControl(); Mp|Jt
c.run(); cE
'LE1DK
out.print(CountCache.list.size()+"<br>"); <Q9l'u]3$c
%>