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: 92g&,Wb
y-vQ4G5F|
CountBean.java }bYk#6KX
5Cl;h^R|m
/* c'Zs2s7$
* CountData.java Uc5BNk7<=
* -4t!k
Aw`
* Created on 2007年1月1日, 下午4:44 ux1SQ8C *
* OB\jq!"
* To change this template, choose Tools | Options and locate the template under [-w+ACV~
* the Source Creation and Management node. Right-click the template and choose ~%u;lr
* Open. You can then make changes to the template in the Source Editor. ePe/@g1K*
*/ 7_ao?}g
we2D!Ywr
package com.tot.count; TbR!u:J
ui1h M
/** R%)7z)~
* R2dCp|6A
* @author a'YK1QX
*/ |v= */e
public class CountBean { YE1X*'4
private String countType; Uf<IXx&;
int countId; <jtu/U]78|
/** Creates a new instance of CountData */ I2*\J)|f
public CountBean() {} Ui05o7xg~p
public void setCountType(String countTypes){ 7A4_b8
this.countType=countTypes; K5:>
} .u&GbM%Ga
public void setCountId(int countIds){ IGcYPL\&
this.countId=countIds; Un{ 9reX5
} LABLT;c
public String getCountType(){ h|XLL|:
return countType; (-esUOB.
} 8B|B[,`
public int getCountId(){ Ap9 %5:]
return countId; mE3M$2}
} *)um^O
} k+y>xI,
5Jm%*Wb
CountCache.java |9fGn@-
.eG_>2'1
/* ys Td'J
* CountCache.java VTwJtWnq
* ^.(i!BG'
* Created on 2007年1月1日, 下午5:01 ^y3snuLtE
* ^RE("'+
* To change this template, choose Tools | Options and locate the template under w$z]Z-
* the Source Creation and Management node. Right-click the template and choose L(\o66a-rV
* Open. You can then make changes to the template in the Source Editor. bs\7 juHt
*/ P |kfPohI=
nZ~J&QK-
package com.tot.count; 1bpjj'2%x
import java.util.*; wsyAq'%L
/** [E4#|w
* qn#f:xltu
* @author Nt
P=m
@
*/ 2j*o[kAE
public class CountCache { Yp8GW1@
public static LinkedList list=new LinkedList(); Nk&$b
/** Creates a new instance of CountCache */ s.KHm
L3
public CountCache() {} ul[+vpH9
public static void add(CountBean cb){ +oR wXO3W
if(cb!=null){ 0ZjinWkR[
list.add(cb); 9{XC9\~
} pTIE.:g(
} q5u"v
} iBy
^
@#KZ2^
CountControl.java <jHo2U8/"s
5_= HtM[v]
/* E>3(ff&
* CountThread.java A]q"+Z]
* 2]/[
* Created on 2007年1月1日, 下午4:57 [{cMEV&
* =#sr4T
* To change this template, choose Tools | Options and locate the template under Uh8c!CA8:\
* the Source Creation and Management node. Right-click the template and choose I,wgu:}P#
* Open. You can then make changes to the template in the Source Editor.
v{*#
*/ j5]6CG_
l[Rl:k!
package com.tot.count;
9M!J7 W
import tot.db.DBUtils; ^Yu%JCN8g
import java.sql.*; D}6~2j
/** CiTjRJ-ZW)
* pG(%yIiAi
* @author Hv.nO-c
*/ KL6FmL)HH
public class CountControl{ 9|9Hk1
private static long lastExecuteTime=0;//上次更新时间 5p`.RWls
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 k\`~v$R3
/** Creates a new instance of CountThread */ "L~qsFL
public CountControl() {} sQ>L3F;A`
public synchronized void executeUpdate(){ BaUcmF2Q
Connection conn=null; |*-&x:p7O
PreparedStatement ps=null; Kitx%P`i
try{ @h";gN
conn = DBUtils.getConnection(); Zm~oV?6
conn.setAutoCommit(false); ?5MOp
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); y0f"UH/
for(int i=0;i<CountCache.list.size();i++){ GI$7uR}
CountBean cb=(CountBean)CountCache.list.getFirst(); "~^#{q
CountCache.list.removeFirst(); :q,tmk h
ps.setInt(1, cb.getCountId()); gS$?#!f
ps.executeUpdate();⑴ R@Kzdeo
//ps.addBatch();⑵ BT8L 'qEj
} >V1v.JH
//int [] counts = ps.executeBatch();⑶ ae`6hW2
conn.commit(); M
h5>@-fEE
}catch(Exception e){ A9L
{c!|-
e.printStackTrace(); ofIw7D*h
} finally{ wtpz ef=
try{ sAec*Q(R
if(ps!=null) { }Uc)iNU
ps.clearParameters(); haW*W=kv)
ps.close(); (np60mX<
ps=null; 9j~|m
} ~v+A6N:qC
}catch(SQLException e){} NwPC9!*
DBUtils.closeConnection(conn); smTPca)7s
} QKt[Kte
}
YD|;xuh
public long getLast(){ FyV)Nmc%t
return lastExecuteTime; WfF~\DlrD
} B %Vz -t
public void run(){ Tz{f5c&
long now = System.currentTimeMillis(); cgevP`*]
if ((now - lastExecuteTime) > executeSep) { Y ~%9TC
//System.out.print("lastExecuteTime:"+lastExecuteTime); d"Aer
//System.out.print(" now:"+now+"\n"); @+P7BE}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); "Gh5
^$w?j
lastExecuteTime=now; aS,M=uqqK
executeUpdate(); uiQR RT
} (h3f$
else{ Oj ?
|g_
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); IGC:zZ~z
} Gl@}b\TB
} JNZ O7s
} mM6X0aM
//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 ]= nM|e
TCI%Ox|a
类写好了,下面是在JSP中如下调用。 Td"_To@jd
"cVJqW
<% ]> dCt<
CountBean cb=new CountBean(); "ke>O'
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); py8)e7gX=
CountCache.add(cb); ZN `D!e6
out.print(CountCache.list.size()+"<br>"); \sZT[42
CountControl c=new CountControl(); 0V_dg |.
c.run(); 6mAaFDI,R
out.print(CountCache.list.size()+"<br>"); mOQN$d [
%>