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: oY~ Dg
w6dFb6~R
CountBean.java 9vNkZ-1
D0(xNhmKz
/* FOwDp0
* CountData.java C${S^v
* '\fY<Q:!
* Created on 2007年1月1日, 下午4:44 %n%xR%|
* am_gH
* To change this template, choose Tools | Options and locate the template under tj]9~eJ-
* the Source Creation and Management node. Right-click the template and choose y %$O-q
* Open. You can then make changes to the template in the Source Editor. e^YHJ>@
*/ X2mREt9
'1fNBH2
package com.tot.count; (KZHX5T=
Sw`RBN[ yo
/** F;lI+^}}
* WnwhSr2
* @author \k`n[{
*/ +`M!D }!
public class CountBean { LWsP ya
private String countType; f=!PllxL:
int countId; {y] mk?j
/** Creates a new instance of CountData */ %S`
v!*2
public CountBean() {} YJS{i
public void setCountType(String countTypes){ &bz:K8c
this.countType=countTypes; GSoZx0
} qrvsjYi*w
public void setCountId(int countIds){ dUgrKDNyA
this.countId=countIds; { wF&+kH3
} V~ ~=Qp+.
public String getCountType(){ #eU.p&Zc
return countType; D9mz9
} iz(u=/*\
public int getCountId(){ ?.c;oS|
return countId; ^[Ua46/" m
} `s '#
} t&5%?QyM
5F t5@UF~
CountCache.java VN0mDh?E
+(O~]Q-Ez
/* SYeadsvF
* CountCache.java 04%S+y.6&Y
* >3:?)
* Created on 2007年1月1日, 下午5:01 kpbm4t
* "x941}
* To change this template, choose Tools | Options and locate the template under L{l6Dd43q
* the Source Creation and Management node. Right-click the template and choose ~A<H9Bw
* Open. You can then make changes to the template in the Source Editor. xR"M*%{@0
*/ 2Nxm@B` {
:{'k@J"|a
package com.tot.count; ;Z j]~|
import java.util.*; +9O5KI?P
/** {
74mf'IW
* 7:]Pl=:X
* @author J`IDlGFYp
*/ Z=4{Vv*
public class CountCache { ,y9iKkg
public static LinkedList list=new LinkedList(); FLoNE>q
/** Creates a new instance of CountCache */ /!}'t
public CountCache() {} >U1R.B7f
public static void add(CountBean cb){ 2#X4G~>#h
if(cb!=null){ n\I#CH0V
list.add(cb); e&MC|US=\
} (qn2xrV
} [ rNXQ`/
} wdzOFDA
.yT8NTu~0j
CountControl.java mD:IO
z3t~}aL
/* T{]~07N?
* CountThread.java s{ V*1$e~
* Q "oI])r
* Created on 2007年1月1日, 下午4:57 \^1+U JU
* L.xZ_ 6
* To change this template, choose Tools | Options and locate the template under xX0-]Y h:
* the Source Creation and Management node. Right-click the template and choose Cp^@zw*/
* Open. You can then make changes to the template in the Source Editor. d"G+8}.4
*/ <J(sR
h0?2j)X_
package com.tot.count; jNwjK0?
import tot.db.DBUtils; &X9Z
W$C
import java.sql.*; e98lhu"|H
/** V&soN:HS
* ,1q_pep~?%
* @author _qvK*nE
*/ t3Z_Dp~\
public class CountControl{ uUE9g
private static long lastExecuteTime=0;//上次更新时间 %2'A
pp
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S1n3(U:m
/** Creates a new instance of CountThread */ j4FeSGa
public CountControl() {} KPSh#x&I
public synchronized void executeUpdate(){ oHM
]
Connection conn=null; |vte=)%
PreparedStatement ps=null; &"_u}I&\
try{ ""O"
conn = DBUtils.getConnection(); `<^VR[Mx
conn.setAutoCommit(false); K.C>
a:J
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 4fh^[\
for(int i=0;i<CountCache.list.size();i++){ 0s#vwK13
CountBean cb=(CountBean)CountCache.list.getFirst(); E'1+ Yq
CountCache.list.removeFirst(); {)- .xG
ps.setInt(1, cb.getCountId()); )f+U~4G&
ps.executeUpdate();⑴ ka\OJ7u
//ps.addBatch();⑵ s57N) 0kP
} @L84>3O
//int [] counts = ps.executeBatch();⑶ #6+FY+/
conn.commit(); o
sbHs$C
}catch(Exception e){ bf_I9Z3m
e.printStackTrace(); ggtDN{t
} finally{ 6{x,*[v
try{ -71dN0hWh
if(ps!=null) { sDqe(x}a
ps.clearParameters(); {qKxz9.y
ps.close(); , xx6$uZ
ps=null; ?%Rw(E
}
|eoid?=
}catch(SQLException e){} qo+N,x9o
DBUtils.closeConnection(conn); ?3z- _8#
} ;TQf5|R\K
} tg4Y i|5
public long getLast(){ zWw2V}U!
return lastExecuteTime; Kzy/9
} BhpOXqg
public void run(){ 6Dws,_UAZ4
long now = System.currentTimeMillis(); 5q{h 2).)
if ((now - lastExecuteTime) > executeSep) { O<9~Kgd8h
//System.out.print("lastExecuteTime:"+lastExecuteTime); m,3er*t{
//System.out.print(" now:"+now+"\n"); 6
y"-I!&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); LL!.c
lastExecuteTime=now; B bhfG64
executeUpdate(); f#%JSV"7
} W-RqN!snJ8
else{ 8pLBt:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); IWVlrGyM
} t<uYM
} (VvKGh
} '"pd
//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 W[[oSqp
gOT+%Ab{_
类写好了,下面是在JSP中如下调用。 J?)RfK|!
LCXO>MXN
<% ZZ/cq:3$ P
CountBean cb=new CountBean(); @#+jMV$g
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); OwzJO
CountCache.add(cb); di9!lS$
out.print(CountCache.list.size()+"<br>"); ,O=a*%0rt
CountControl c=new CountControl(); \8uo{#cL8
c.run(); 2.}R
out.print(CountCache.list.size()+"<br>"); !=Y;h[J.p
%>