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: >Nov9<p
m\t
%wr
CountBean.java `a J[
!O
2@ad! h
/* -Oo$\=d
* CountData.java ;c'jBi5W
* F8pLA@7[
* Created on 2007年1月1日, 下午4:44 g><sZqj8tt
* W6)A":`
* To change this template, choose Tools | Options and locate the template under "e(Nh%t
* the Source Creation and Management node. Right-click the template and choose q[+];
* Open. You can then make changes to the template in the Source Editor. #):FXB$a
*/ shi#K<gVC
?e BN_a,r6
package com.tot.count; 55#H A?cR
uto4bs:
/** Kp"o0fh<9
* \Wo,^qR
* @author O9qEKW)a
*/ vX{]_
public class CountBean { (BJs6":BFe
private String countType; `'g%z: ~
int countId; e]rWR
/** Creates a new instance of CountData */ 6l50IWj,T
public CountBean() {} rc$G0O
public void setCountType(String countTypes){ I|p(8R!
this.countType=countTypes; 6VA@ ;g0$
} mtHw! *
public void setCountId(int countIds){ l<gg5 Zea
this.countId=countIds; * @oAM,@
} < B'BlqTS
public String getCountType(){ 3c6#?<%0`
return countType; \}cEHLq
} l9-(ofY*J
public int getCountId(){ d`Wd"LJ=
return countId; 1X=}
} En[cg
} pN?
(pAGS{{
CountCache.java @o_-UsUX
R7vO,kZ6Q
/* )4DF9 JpD
* CountCache.java xvb5-tK
-
* JD,/oL.KA
* Created on 2007年1月1日, 下午5:01 A9[l5E
* 32dR`qb
* To change this template, choose Tools | Options and locate the template under 3]V"9+
* the Source Creation and Management node. Right-click the template and choose 'H97D-86/
* Open. You can then make changes to the template in the Source Editor. Qq>M}
*/ )Wgh5C`
j134iVF%
package com.tot.count; Z:5e:M
import java.util.*; D;m>9{=
/** |o6B:NH,rg
* 58WL8xu
* @author ?&"-y)FG
*/ Td?a=yu:J
public class CountCache { \= i>}Sg
public static LinkedList list=new LinkedList(); @*!8
/** Creates a new instance of CountCache */ ?oP<sGp
public CountCache() {}
z7>
public static void add(CountBean cb){ KYMz
if(cb!=null){ SxH b76 ;
list.add(cb); PY~cu@'k{
} Kk-A?ju@g
} 5ILce%#zL
} `Fnt#F}
~Sh8. ++}
CountControl.java Xji<oih
'9*(4/,UJJ
/* tKu'Q;J
* CountThread.java :IvKxOv
* !5&%
P b
* Created on 2007年1月1日, 下午4:57 S }mqK|!
* !bRoNP
* To change this template, choose Tools | Options and locate the template under i#=s_v8
* the Source Creation and Management node. Right-click the template and choose 8Y_wS&eB
* Open. You can then make changes to the template in the Source Editor. =UT*1-yhR
*/ J1KV?aR
"'~55bG
package com.tot.count; .gzNdSE
import tot.db.DBUtils; zq _*)V
import java.sql.*; cl/}PmYIZ
/** G?v]p~6
* >+LFu?y
* @author R$sG*=a!8j
*/ IXc"gO
public class CountControl{ bC&*U|de
private static long lastExecuteTime=0;//上次更新时间 :>+}|(v
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 OLg=kF[[
/** Creates a new instance of CountThread */ :VGvL"Kro
public CountControl() {} \ ?sM
public synchronized void executeUpdate(){ ~QQi{92
Connection conn=null; /p}^Tpu
PreparedStatement ps=null; kzcl
try{ Myvp PW
conn = DBUtils.getConnection(); U8m/L^zh
conn.setAutoCommit(false); W^v3pH-y#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2Sz?r d,0f
for(int i=0;i<CountCache.list.size();i++){ Bs:INvhYW
CountBean cb=(CountBean)CountCache.list.getFirst(); f_I6g uDPz
CountCache.list.removeFirst(); g
67;O(3
ps.setInt(1, cb.getCountId()); ~|QhWgq
ps.executeUpdate();⑴ P;GRk6
//ps.addBatch();⑵ ER-X1fD
} 6R1}fdHvP
//int [] counts = ps.executeBatch();⑶ 1CXO=Q
conn.commit(); xy;u"JY*
}catch(Exception e){ [+j}:u
e.printStackTrace(); pbJC A&
} finally{ 9=YX9nP
try{ lXso@TNrZ0
if(ps!=null) { V $Y=JK@
ps.clearParameters(); <#HQU<
ps.close(); ROqz$yY
ps=null; Hwiw:lPq`E
} }04EM
}catch(SQLException e){} G6@XRib3
DBUtils.closeConnection(conn); sbqAjm}
} J$"3w,O6+U
} X"lPXoCN
public long getLast(){ 0&wbGbg(W
return lastExecuteTime; ,sF49CD
} l=4lhFG,Mk
public void run(){ 9
M>.9~
long now = System.currentTimeMillis(); &![3{G"+>l
if ((now - lastExecuteTime) > executeSep) { Pk)>@F<
//System.out.print("lastExecuteTime:"+lastExecuteTime); QPr29
//System.out.print(" now:"+now+"\n"); v{tw ;Z#
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); awu18(;J
lastExecuteTime=now; 2nz^%pLT
executeUpdate(); 5\S
s`#g
} ^6g^ Q*"
else{ ' m^nKG$"
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |0^~S
} M it3q
} FglW|Hwy
} ]40@yrc
//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 CmP_9M?ce
Q^trKw~XNy
类写好了,下面是在JSP中如下调用。 rHngYcjR
Q> d<4]`
<%
|k,M$@5s
CountBean cb=new CountBean(); eICavp
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ykMdH:
CountCache.add(cb); n[+$a)$8
out.print(CountCache.list.size()+"<br>"); sQ";
t=yC
CountControl c=new CountControl(); Q7#Yw"#G!
c.run(); mZ_643|
out.print(CountCache.list.size()+"<br>"); 6 rp(<D/_
%>