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: kF(Ce{;z
457fT |
CountBean.java tXf}jU}
2j8Cv:{Nn%
/* sTKab
:
* CountData.java 'v'`
F*6
* xNC* ]8d
* Created on 2007年1月1日, 下午4:44 }': EJ~H
* /{fZH,!L
* To change this template, choose Tools | Options and locate the template under F3r S6_
* the Source Creation and Management node. Right-click the template and choose W$z#ssr
* Open. You can then make changes to the template in the Source Editor. =gW"#ZjL){
*/ <KHv|)ak
#'J~Xk
package com.tot.count; Qy{NS.T
?*CRa$_I|
/** ]~?S~l%
* 5"1!p3`\D{
* @author /yx=7<
*/ CCuxC9i7
public class CountBean { 8_"3Yb`f
private String countType; 'is,^q:@
int countId; J*}VV9H
/** Creates a new instance of CountData */ i'Y-V]->
public CountBean() {} <8iYL`3
public void setCountType(String countTypes){ g/OI|1a
this.countType=countTypes; NlA*\vco
} eZynF<i
public void setCountId(int countIds){ :6 Uk)
this.countId=countIds; !(B_EM
} !aQIh
public String getCountType(){ d>^~9X
return countType; 5+y@ ]5&g
} *w=z~Jq^R"
public int getCountId(){ /t$rX3A
return countId; ,"@w>WL<9
} (3AYy0J%
} rQ=xcn[A
MPjr_yc]
CountCache.java hA@zoIoe
])N|[ |$
/* lN);~|IOv7
* CountCache.java PASuf.U$"
* d-hbvLn
* Created on 2007年1月1日, 下午5:01 XXXljh6
* j'k8^*M6
* To change this template, choose Tools | Options and locate the template under <Cu'!h_nL
* the Source Creation and Management node. Right-click the template and choose ;JAK[o8i
* Open. You can then make changes to the template in the Source Editor. i B%XBR
*/ dj3|f{kg{
&K06}[J
package com.tot.count; 63.( j P1;
import java.util.*; grGhN q
/** O-i4_YdVt
* vB Sm=M
* @author _i-\mR_~
*/ k&O C&
public class CountCache { $RpFxi
public static LinkedList list=new LinkedList(); \^yXc*C
/** Creates a new instance of CountCache */ D=2~37CzQ1
public CountCache() {} <H<!ht%q3
public static void add(CountBean cb){ \.5F](:
if(cb!=null){ .H ,pO#{;
list.add(cb); Dp^"J85}
} &8Zeq3~
} T0g0jr{
} j0AwL7
}|AX_=a
CountControl.java >+L7k^[,0
|Es0[cU
/* Ny[QT*nV
* CountThread.java (viWY
* =ntftSH
* Created on 2007年1月1日, 下午4:57 j(&GVy^;?
* 5n:nZ_D
* To change this template, choose Tools | Options and locate the template under !zU/Hq{wcK
* the Source Creation and Management node. Right-click the template and choose N A8
sN
* Open. You can then make changes to the template in the Source Editor. _jW>dU^B
*/ 9p5= _
%z30=?VL
package com.tot.count; P%iP:16
import tot.db.DBUtils; z3clUtC+
import java.sql.*; 64SW
/** \e_IFISC
* Ih; aBS
* @author aUAcRW
*/ |0lLl^zp
public class CountControl{ kPW BDpzN
private static long lastExecuteTime=0;//上次更新时间 ^,LtEwd~Y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I<sfN'FpT
/** Creates a new instance of CountThread */ TFo}\B7
public CountControl() {} )GK+
public synchronized void executeUpdate(){ en%J!<&W{K
Connection conn=null; 2bkJ /u`i
PreparedStatement ps=null; ;r3}g"D@
try{ tp@*=*^I
conn = DBUtils.getConnection(); ~H7!MC~K
conn.setAutoCommit(false); H*GlWgfG
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); UnP|]]o:I
for(int i=0;i<CountCache.list.size();i++){ uN8/Q2
CountBean cb=(CountBean)CountCache.list.getFirst(); /\d(c/, 4
CountCache.list.removeFirst(); rjXnDh]MC
ps.setInt(1, cb.getCountId()); *u}'}jC1X
ps.executeUpdate();⑴ '|_/lz$h
//ps.addBatch();⑵ MBlBMUJk
} 2R\+}
//int [] counts = ps.executeBatch();⑶ 7"#f!.E
conn.commit(); d)\2U{
}catch(Exception e){ ,'u *ZB;
e.printStackTrace(); W-1sU g[AN
} finally{ ubi~%
try{ ;ed#+$Na
if(ps!=null) { w;~>k%}j
ps.clearParameters(); J||E;=%f-Q
ps.close(); oooS s&t
ps=null; v G2.]?
} Nfg{,/O
}catch(SQLException e){} c+~LpSQ
DBUtils.closeConnection(conn); =x1Wii$`
} #,TELzUVE
} -;vT<G3
public long getLast(){ N\'TR6_,b
return lastExecuteTime; Yc|uD-y
} 7_KXD#
public void run(){ Oo1ecbY
long now = System.currentTimeMillis(); (#If1[L
if ((now - lastExecuteTime) > executeSep) { UoHd -
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5?w.rcN[j
//System.out.print(" now:"+now+"\n"); ;I+H>$%jZ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); vTHq)C.7G
lastExecuteTime=now; "-P/jk
executeUpdate(); f}2;N
} Je 31".
else{ lY8`5Uz
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); $T?]+2,6;
} cv]BV>=E
} V:OiW"/
} b4)k &*dfR
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 O:._W<
2$tQ @r
类写好了,下面是在JSP中如下调用。 yyjw?#\8
jQ|:I7y
<% e?P%wqB
CountBean cb=new CountBean(); }3J=DCtS
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); eIJ[0c b}
CountCache.add(cb); |kc@L`7s
out.print(CountCache.list.size()+"<br>"); Wxn#Rk#>
CountControl c=new CountControl(); JCD?qeTg
c.run(); $it@>L8
out.print(CountCache.list.size()+"<br>"); !9D1
Fa
%>