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: ,Q7W))j
h(<2{%j
CountBean.java )BJ Z{E*
=>y%Aj&4
/* ;5ANw"Dq
* CountData.java GLS`1!
* M5C%(sQ$
* Created on 2007年1月1日, 下午4:44 '}F=U(!
* E8`AU<
* To change this template, choose Tools | Options and locate the template under 3 P)N,
* the Source Creation and Management node. Right-click the template and choose EG7.FjnVu
* Open. You can then make changes to the template in the Source Editor. @ 4ccZ&`
*/ B1u.aa$
u{Rgk:bn
package com.tot.count; AA&5wDMV>
i_[nW
/** $,s"c(pv[,
* [v,Y-}wQ)
* @author xE0'eC5n^
*/ l-~
o&n
public class CountBean { )0tq&
private String countType; w1N-`S:
int countId; (8XP7c]5
/** Creates a new instance of CountData */ rQrh(~\:
public CountBean() {} @v:p)|Ne;
public void setCountType(String countTypes){ (E*pM$
this.countType=countTypes; xDsB%~
} t>Ot)d
public void setCountId(int countIds){ E
U#
M.
this.countId=countIds; <,X?+hr
} <$:Hf@tpMo
public String getCountType(){ IXz)xdP
return countType; y%wjQC 0~
} &_Vd
public int getCountId(){ Z1&<-T_
return countId; pOmHxFOOK
} =Zt7}V
} HOY@<'
fxcCz 5
CountCache.java "QV?C
ZD`9Ez)5
/* MODi:jsl
* CountCache.java DO5H(a
* dyyGt}}5f
* Created on 2007年1月1日, 下午5:01
mRYM,
* yE3l%<;q
* To change this template, choose Tools | Options and locate the template under av; ~e<
* the Source Creation and Management node. Right-click the template and choose SI~MTUqt
* Open. You can then make changes to the template in the Source Editor. 7hq$vI%0
*/ xDtJ&6uFw
T`Jj$Lue{
package com.tot.count; $z":E(oy
import java.util.*; '|jN!y^2p
/** ?Z{:[.
* >'MT]@vez
* @author 0CtPq`!
*/ \-2O&v'}
public class CountCache { k O8W>
public static LinkedList list=new LinkedList(); \c .^^8r
/** Creates a new instance of CountCache */ 'v42Q J"{
public CountCache() {} tl@n}
public static void add(CountBean cb){ j56Dt_
if(cb!=null){ `yXJaTbo
list.add(cb); J;mvD^`g
} )r +o51gp
} q'zV9
} l`M7a9*U
G*].g['
CountControl.java ,|Xibfw
^5- 8'9 w
/* cCWk^lF],
* CountThread.java 1#OM~v6B
* 7hLdCS X
* Created on 2007年1月1日, 下午4:57 &.4m(ZX
* U 5f<4I
* To change this template, choose Tools | Options and locate the template under :}[RDF?
* the Source Creation and Management node. Right-click the template and choose 9D+B~8[SQ
* Open. You can then make changes to the template in the Source Editor. Rv^
\o
*/ +Vsd%AnN"l
w<54mGMOLr
package com.tot.count; l^WPv/}?
import tot.db.DBUtils; /P}Wp[)u
import java.sql.*; F%s'R 0l
/** q<2b,w==
* YH
.+(tNv
* @author _go1gf7
*/ dK^WZQ
public class CountControl{ z}sBx9;
private static long lastExecuteTime=0;//上次更新时间 /CT g3Q"KQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 hOTqbd}
/** Creates a new instance of CountThread */ 6t0-u~
public CountControl() {} *(pmFEc
public synchronized void executeUpdate(){ X61p xPa
Connection conn=null; 017(I:V?(:
PreparedStatement ps=null; =w#sCy
try{ _1sjsGp>
conn = DBUtils.getConnection(); /#]4lFk:h
conn.setAutoCommit(false); )c"m:3D@
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); _R] qoUw;
for(int i=0;i<CountCache.list.size();i++){ >qT4'1S*g
CountBean cb=(CountBean)CountCache.list.getFirst();
Fb:Z.
CountCache.list.removeFirst(); ^7zXi xp
ps.setInt(1, cb.getCountId()); 54geU?p0
ps.executeUpdate();⑴ x,~ ys4
//ps.addBatch();⑵ g,,'Pdd7Pn
} $RJpn]d
j
//int [] counts = ps.executeBatch();⑶ qL
0{w7
conn.commit(); J<'7z%2w
}catch(Exception e){ N-Jp; D
e.printStackTrace(); teDO,$
} finally{ %I
3D/!%
try{ 41'|~3\X
if(ps!=null) { ^<"^}Jh.M
ps.clearParameters(); XFx p ^
ps.close(); re-;s
ps=null; W.O]f.h
} fkjo
}catch(SQLException e){} FLE2]cL-
DBUtils.closeConnection(conn); O,+ZD^
} q4wS<,3
} XzH"dDAVE
public long getLast(){ =iEQE
return lastExecuteTime; `r$c53|<u
} sBuOKT/j
public void run(){ tXWhq
long now = System.currentTimeMillis(); O 6}eV^y
if ((now - lastExecuteTime) > executeSep) { 2&+Nr+P
//System.out.print("lastExecuteTime:"+lastExecuteTime); Z91GM1lrf8
//System.out.print(" now:"+now+"\n"); +l8`oQuG
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Vw~st1",[
lastExecuteTime=now; "F3M m
executeUpdate(); ;I5u"MDHGI
} F#S)))#
else{ %x2_njDd
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #3WKm*T/
} F=qG+T
} &P,z$H{o@
} ZNX=]]HM<n
//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 6k@(7Mw8A
m[t4XK
类写好了,下面是在JSP中如下调用。 btV
Tt5
E#L"*vh
<% $ZEwz;HNo
CountBean cb=new CountBean(); :w+2L4lGs
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); l)^sE)
CountCache.add(cb); 'Rg6JW\
out.print(CountCache.list.size()+"<br>"); "Om4P|
CountControl c=new CountControl(); pm 4"Q!K
c.run(); c%bGVRhE
out.print(CountCache.list.size()+"<br>"); (*CGZDg
%>