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: LxLy+yC#p
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CountBean.java "-31'R-
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/* M|q~6oM
* CountData.java #] CFA9z
* +Y}V3(w9X
* Created on 2007年1月1日, 下午4:44 `ltN,?/
* <Mx0\b!
* To change this template, choose Tools | Options and locate the template under [}OgSP9i
* the Source Creation and Management node. Right-click the template and choose :_ROJ
* Open. You can then make changes to the template in the Source Editor. %f j+70
*/ {%C*{,#+8q
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package com.tot.count; <A>)[u
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/** -'`TL$
* \\,f{?w
* @author n`ViTwd]MQ
*/ *)<B0SjT
public class CountBean { <F;v`h|+S
private String countType; OoBCY-gj*
int countId; nOb?-rR
/** Creates a new instance of CountData */ ZE?f!ifp
public CountBean() {} ~gE:-
public void setCountType(String countTypes){ L[g0&b%%-
this.countType=countTypes; :u6JjW[a)
} !z 53OT!
public void setCountId(int countIds){ bDnZcf
this.countId=countIds; MZV_5i@:
} #*9-d/K
public String getCountType(){
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return countType; J@_ctGv
} %'
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public int getCountId(){ ujFzJdp3k
return countId; s&a1y~rv
} Aw5pd7qKL
} a(IY\q[Wh
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CountCache.java SJ?6{2^
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/* p5\]5bb
* CountCache.java :kMHRm@{
* xYfD()w<I
* Created on 2007年1月1日, 下午5:01 +JRF0T
* +k\Uf*wh
* To change this template, choose Tools | Options and locate the template under }|\d+V2On
* the Source Creation and Management node. Right-click the template and choose /PzcvN
* Open. You can then make changes to the template in the Source Editor. 31WC=ur5
*/ Vw tZLP36
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package com.tot.count; 2S"Nf8>zp
import java.util.*; D&G"BZx|
/** 2)X4y"l
* vI1i,x#i
* @author ^EELaG
*/ "9!d]2.-Vk
public class CountCache { 2I/xJ+
public static LinkedList list=new LinkedList(); $e1=xSQp4
/** Creates a new instance of CountCache */ Cx<0 H
public CountCache() {} l<g5yYyf
public static void add(CountBean cb){ 0 B@n{PvR0
if(cb!=null){ {q%Sx*k9[
list.add(cb); \1"'E@+
} /E;y,o75
} d}'U?6ob
}
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CountControl.java V7d)S&*V
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/* )s_n
* CountThread.java cD*}..-/4
* lot%N(mB`
* Created on 2007年1月1日, 下午4:57 kIHDeo%K}
* <%.5hCTp97
* To change this template, choose Tools | Options and locate the template under VKp*9%9
* the Source Creation and Management node. Right-click the template and choose fhPkEvJ
* Open. You can then make changes to the template in the Source Editor. /X"/ha!=&D
*/ ]\-^>!F #K
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package com.tot.count; Zxr!:t7
import tot.db.DBUtils; !p TJ./
import java.sql.*; Jn:ZYqc
/** dZ#&YG)?e
* {7u[1[L1
* @author j#r6b]k(Hv
*/ r={c,i
public class CountControl{ ho8`sh>N
private static long lastExecuteTime=0;//上次更新时间 l^GP3S
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +T/FeVQ
/** Creates a new instance of CountThread */ q<y#pL=k"*
public CountControl() {} o[oM8o<
public synchronized void executeUpdate(){ m!<i0thJ
Connection conn=null; m>USD?i
PreparedStatement ps=null; w(ln5q
try{ <q*oV
conn = DBUtils.getConnection(); ,}oM-B
conn.setAutoCommit(false); qm/Q65>E
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S/|,u`g-
for(int i=0;i<CountCache.list.size();i++){ :B3[:MpL}
CountBean cb=(CountBean)CountCache.list.getFirst(); j',W 64
CountCache.list.removeFirst(); k@zy
ps.setInt(1, cb.getCountId()); lC:k7<0Ji
ps.executeUpdate();⑴ XO#/Fv!
//ps.addBatch();⑵ rX_@Ihv'
} X%z }VA
//int [] counts = ps.executeBatch();⑶ valtev0<
conn.commit(); L,y6^J!
}catch(Exception e){ 8n1'x;
e.printStackTrace(); !cKz7?w
} finally{ =qN2Xg/
try{ rpeJkG@+
if(ps!=null) { SJD@&m%?[
ps.clearParameters(); u\&b4=nL
ps.close(); 8!.ojdyn
ps=null; U*90m~)
} J+rCxn?;g
}catch(SQLException e){} R1Sy9x .
DBUtils.closeConnection(conn); HhO".GA
} oFOnjK"|F
} %ZHP2j
%~
public long getLast(){ "KcA
return lastExecuteTime; n>@oBG)!
} >WY#4
public void run(){ DN4$Jva
long now = System.currentTimeMillis(); R$; n)_H
if ((now - lastExecuteTime) > executeSep) { y#}cC+;
//System.out.print("lastExecuteTime:"+lastExecuteTime); [MuEoWrq(}
//System.out.print(" now:"+now+"\n"); ),%6V5a+E
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); wFG3KzEq ~
lastExecuteTime=now; 8XbA'% o
executeUpdate(); U
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} {vAE:W.s
else{ V_plq6z
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); + QQS={
} 06jqQ-_`h
} hig2
} *#TUGfwy
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 .<kqJ|SVi
KNH1#30 K
类写好了,下面是在JSP中如下调用。 v<Bynd-
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<% l5L.5$N
CountBean cb=new CountBean(); E=){K
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); <uj8lctmP
CountCache.add(cb); pp9Zb.D\
out.print(CountCache.list.size()+"<br>"); mPq$?gdp
CountControl c=new CountControl(); wAnb
Di{W
c.run(); !w&kyW?e
out.print(CountCache.list.size()+"<br>"); 2^?:&1:
%>