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: g{W;I_P^9
iA8U Yd3Q
CountBean.java 0sI1GhVR
y=In?QN{6*
/* QO"oEgB`+Z
* CountData.java da1]mb=4 5
* GN KF&M
* Created on 2007年1月1日, 下午4:44 uB!kM
* 'n<iU st
* To change this template, choose Tools | Options and locate the template under &/Ro lIHF
* the Source Creation and Management node. Right-click the template and choose 4w#``UY)'
* Open. You can then make changes to the template in the Source Editor. -(O-%
*/ _qbIh
}FzqW*4~
package com.tot.count; WL` 9~S
ypJ".
/** p>_;^&>&
* Vy_2 .
* @author 8q1wHZ
*/ Wrr cx(
public class CountBean { :4^\3~i1X
private String countType; hFiIW77s2
int countId; piU/&
/** Creates a new instance of CountData */ c/_+o;Bc
public CountBean() {} _+
.\@{c
public void setCountType(String countTypes){ o)OUWGjb/K
this.countType=countTypes; qlA7tU2p&
} w8g,a]p
public void setCountId(int countIds){ ^F:k3,_[
this.countId=countIds; >~K
qg~
} @ym/27cRE
public String getCountType(){ jy]JiQB
return countType; `DT3x{}_S
} tzy'G"P|
public int getCountId(){ )xb|3&+W
return countId; Rb(SBa
}
aR,}W\6M
} TYI7<-Mp:[
>vuY+o;B
CountCache.java wvrrMGU)a
7\ nf:.
/*
9CCkqB/
* CountCache.java *D'$"@w3
* q~o,WZG
* Created on 2007年1月1日, 下午5:01 rQ=,y>-*
* U^qt6$bK
* To change this template, choose Tools | Options and locate the template under S1/`th
* the Source Creation and Management node. Right-click the template and choose " R8KQj
* Open. You can then make changes to the template in the Source Editor. Hcc"b0>}{
*/ %Th>C2\
@iEA:?9uX
package com.tot.count; &Q}*+Y]G
import java.util.*; Xn~I=Ml d
/** &-5_f*{
* _-5,zPR
* @author tgjr&G}a@0
*/ _z[#}d;k
public class CountCache { <cA/<3k)
public static LinkedList list=new LinkedList(); o[H{(f1%
/** Creates a new instance of CountCache */ %F kMv
public CountCache() {} v\`9;QV5
public static void add(CountBean cb){ 1 { , F
if(cb!=null){ J[^}u_z
list.add(cb); "_2Ng<2
} erVO|<%=R
} EC|'l
} Jv.UQ
0euuT@_$
CountControl.java 5MzFUv0)
uUKcB:
/* V21njRS
* CountThread.java YDGS}~m~Q
* IF]lHB
* Created on 2007年1月1日, 下午4:57 Cuc$3l(%
* JoSJH35=:
* To change this template, choose Tools | Options and locate the template under OLI$1d_
* the Source Creation and Management node. Right-click the template and choose rpw.]vnn
* Open. You can then make changes to the template in the Source Editor. hK<5KZ/4
*/ ZylJp8U
7OjR._@
package com.tot.count; Bo5ZZY
import tot.db.DBUtils; 8( btZt
import java.sql.*; z"*/mP2
/** c$wsH25KH8
* r[?1
* @author W
d0NT@
*/ \P1=5rP
public class CountControl{ Dde]I_f}
private static long lastExecuteTime=0;//上次更新时间 M4xi1M#%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 N25V]
/** Creates a new instance of CountThread */ ;;A2!w{}[i
public CountControl() {} 97)/"i e
public synchronized void executeUpdate(){ m[k_>e\u
Connection conn=null; Kt0(gQOr0
PreparedStatement ps=null; ?'"X"@r5
try{ 9;xM%
conn = DBUtils.getConnection(); y,pZTlE
conn.setAutoCommit(false); N?X~ w <
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1,5E`J
for(int i=0;i<CountCache.list.size();i++){ ~SSU`
CountBean cb=(CountBean)CountCache.list.getFirst(); r\;ut4wy
CountCache.list.removeFirst(); S.!UPkW H
ps.setInt(1, cb.getCountId()); [%&ZPJT%i
ps.executeUpdate();⑴ g:0#u;j^7
//ps.addBatch();⑵ n<B<93f/
} /pp1~r.s?>
//int [] counts = ps.executeBatch();⑶ j1 =`|
conn.commit(); oq*N_mP0
}catch(Exception e){ UJs$q\#RO
e.printStackTrace(); JMdPwI
} finally{ ?aW^+3i
try{ <LRey%{q
if(ps!=null) { WMMO5_Mz
ps.clearParameters(); jjM{]
ps.close(); aTBR|US
ps=null; {-BRt)L[
} ,sGZ2=M}J
}catch(SQLException e){} fqu}Le
DBUtils.closeConnection(conn); \n9zw'
} l]<L [Y,E-
} MQ)L:R`L
public long getLast(){ sdCvG R e
return lastExecuteTime; {,OS-g
} }h 3K@R
public void run(){ .vG,fuf8
long now = System.currentTimeMillis(); s}j1"@
if ((now - lastExecuteTime) > executeSep) { 7OWbAu;
//System.out.print("lastExecuteTime:"+lastExecuteTime); =+w*gDr
//System.out.print(" now:"+now+"\n"); q$G,KRy/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); jgS%1/&
lastExecuteTime=now; KN"S?i]X
executeUpdate(); T;L>P[hNn
} hm<}p&!J
else{ hXGwP4
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /*Qq[C
} XlI!{qj|
} OiDhJ
} 8>/Q1(q0
//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 @E.k/G!~Nb
1
y}2+Kk
类写好了,下面是在JSP中如下调用。 #.[AK_S5&
8.bKb<y
<% m?HZ;
CountBean cb=new CountBean(); 7=]i~7uy
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); flgRpXt
CountCache.add(cb); wM[~2C=vx
out.print(CountCache.list.size()+"<br>"); m*X[ Jtr
CountControl c=new CountControl(); 'B0{U4?
c.run(); Jgu94.;5
out.print(CountCache.list.size()+"<br>"); -CH`>
%>