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: 7(<z= F
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CountBean.java _M9-n
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/* v|K<3@J
* CountData.java 2[Q/|D}}|
* L2m~ GnP|?
* Created on 2007年1月1日, 下午4:44 u=9)A9
* #Hy fjj
* To change this template, choose Tools | Options and locate the template under s
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* the Source Creation and Management node. Right-click the template and choose f]JLFg7
* Open. You can then make changes to the template in the Source Editor. PDH00(#;+
*/ c
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package com.tot.count; c<n <!!vi
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/** 0'O*Y
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* .P>-Fh,_p
* @author K%/:V
*/ 6fr@y=s2:
public class CountBean { 'AjDB:Mt$
private String countType; UM QsYD)
int countId; 56Gc[<nR
/** Creates a new instance of CountData */ ("$ ,FRTQ:
public CountBean() {} mFu0$N6]H
public void setCountType(String countTypes){ iQnIk|8
this.countType=countTypes; 0nV|(M0lu?
} U*7Yi-"/*
public void setCountId(int countIds){ K
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this.countId=countIds; m6D]
} =fZMute
public String getCountType(){ >84:1`
return countType; ON~K(O2g(
} l{b*YUsz>
public int getCountId(){ BvA09lK
return countId; XK7$Xbd
} j/+e5.EX/
} jaq`A'o5
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CountCache.java +bv-! rf
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/* js#72T/_n
* CountCache.java L&s|<<L
* rS3* k3
* Created on 2007年1月1日, 下午5:01 6s$jt-bH
* /y<nAGtD&
* To change this template, choose Tools | Options and locate the template under O3>m,v
* the Source Creation and Management node. Right-click the template and choose WFBVAD
* Open. You can then make changes to the template in the Source Editor. ]@D#<[5\
*/ %Z#s9QC
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package com.tot.count; $<N!2[I L
import java.util.*; _jr'A -M
/** ^Td_B03)
* OKH4n/pq
* @author MPg"n-g*
*/ ; OpN&q+
public class CountCache { CS<,qvLpL
public static LinkedList list=new LinkedList(); }F~4+4B^
/** Creates a new instance of CountCache */ ;[~:Y[N
public CountCache() {} ~&?{hd.
public static void add(CountBean cb){ (,5,}
if(cb!=null){ QIg.r\>o
list.add(cb); ;}BDEBl
} NLLLt
} O5:2B\B
} =Hs[peO*
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CountControl.java X>`5YdT~+
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/* :jc
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* CountThread.java bim
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* jbU=D:|
* Created on 2007年1月1日, 下午4:57 |dxcEjcY_
* A&:i$`m,
* To change this template, choose Tools | Options and locate the template under 7kZ-`V|\.
* the Source Creation and Management node. Right-click the template and choose s^n}m#T
* Open. You can then make changes to the template in the Source Editor. k]<E1 c/
*/ .9Y,N&V<H
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package com.tot.count; |Qe#[Q7
import tot.db.DBUtils; V#Px
import java.sql.*; T.57Okp
/** g,0u_$U
* JGB 9Z
* @author 1Y-m=~J7
*/ pRAdo="
public class CountControl{ %SX)Z
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private static long lastExecuteTime=0;//上次更新时间 Q0\tK=Z/
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 d,R
/** Creates a new instance of CountThread */ "&,Gn#'FG
public CountControl() {} Snav)Hb'
public synchronized void executeUpdate(){ O&Ws*k
Connection conn=null; lOc!KZHUp
PreparedStatement ps=null; Y8^pgv
try{ W_##8[r(?
conn = DBUtils.getConnection(); EM.7,;|N
conn.setAutoCommit(false); X}/{90UD
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [9:'v@Ph
for(int i=0;i<CountCache.list.size();i++){ aq|R?
CountBean cb=(CountBean)CountCache.list.getFirst(); ,bQbj7
CountCache.list.removeFirst(); Y}/e"mp
ps.setInt(1, cb.getCountId()); :RH0.5)
ps.executeUpdate();⑴ jBTXs5q
//ps.addBatch();⑵ soH
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} )tRqt9Th*
//int [] counts = ps.executeBatch();⑶ I\BcG(hlJ
conn.commit(); GomTec9.
}catch(Exception e){ Jx:t(oUR+
e.printStackTrace(); 0M'[|cid|
} finally{ VGVZ`|
try{ 0
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if(ps!=null) { \GR M,c
ps.clearParameters(); a*pwVn
ps.close(); .!kO2/:6
ps=null; !&3iZQGWv
} ~is$Onf99#
}catch(SQLException e){} q:y_#r"_y
DBUtils.closeConnection(conn); JVoW*uA
} $E_9AaX
} F%8W*Y699
public long getLast(){ TH`zp]0
return lastExecuteTime; _ 2WG6y;
} z g@,s"`>
public void run(){ Ls<.&3X2
long now = System.currentTimeMillis(); I-fjqo3
if ((now - lastExecuteTime) > executeSep) { RW!_ZzZ
//System.out.print("lastExecuteTime:"+lastExecuteTime); #9{9T"ed
//System.out.print(" now:"+now+"\n"); vBMuV pzO
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 3N'f Hy
lastExecuteTime=now; P~>E
executeUpdate(); j A 9!
} )]=1W
else{ FAS+*GFz
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =9lrPQ]w
} 1;\A./FVv
} a^vXwY
} #!m`A+!~!
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 =*icCng
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类写好了,下面是在JSP中如下调用。 PFqc_!Pm
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<% _86#$|kw
CountBean cb=new CountBean(); QEh_2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `Jvy~T
CountCache.add(cb); W;Rx(o>
out.print(CountCache.list.size()+"<br>"); =5UT'3p>
CountControl c=new CountControl(); C)7T'[
c.run(); Qg7rkRia
out.print(CountCache.list.size()+"<br>"); YpAJ7E|7
%>