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: =Z G:x<Hg
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CountBean.java J*fBZ.NO
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/* AVw%w&|%
* CountData.java =Gk/k}1
* <spZ! #o
* Created on 2007年1月1日, 下午4:44 sZ&G%o
* KvPX=/&Zu
* To change this template, choose Tools | Options and locate the template under Cx_Q :6T
* the Source Creation and Management node. Right-click the template and choose B;K`q
* Open. You can then make changes to the template in the Source Editor. <plC_{Y:wu
*/ CjIu[S1%
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package com.tot.count; 76cG90!Z
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/** X[gn+6WB%
* mo{MR:>)
* @author 6 15s5ZA
*/ !QI\Fz?
public class CountBean { C[!MS5
private String countType; A5'NGt
int countId; ENF"c$R
/** Creates a new instance of CountData */ {gNV[45
public CountBean() {} JO<wK
public void setCountType(String countTypes){ E37<"(;
this.countType=countTypes; 2Qp Hvsl_
} 0$+fkDf
public void setCountId(int countIds){ ps
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this.countId=countIds; -x8nQ%X
} Io4(f
public String getCountType(){ |tR
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return countType; /2EHv.e`
} B+C);WQ,
public int getCountId(){ zA+~7;7E
return countId; Ofm%:}LV
} "<_0A f]
} lv vs%@b>
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CountCache.java 8d*/HF)h
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/* -/{4Jf Wf
* CountCache.java *BuUHjTv
* -V,v9h^
* Created on 2007年1月1日, 下午5:01 aLJ(?8M@
* A;\7|'4
* To change this template, choose Tools | Options and locate the template under L-B<nl
* the Source Creation and Management node. Right-click the template and choose `(A5f71MfM
* Open. You can then make changes to the template in the Source Editor. `qd+f{Q
*/ 1]IQg;q
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package com.tot.count; '13ZX:
import java.util.*; :l|%17N
/** $zB[B;-!$
* :qChMU|Y6
* @author 8-y{a.,u.
*/ !mWiYpbU+
public class CountCache { +f*OliMD
public static LinkedList list=new LinkedList(); n,B,"\fw
/** Creates a new instance of CountCache */ s
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public CountCache() {} Y"OG@1V;8
public static void add(CountBean cb){ []a[v%PkG
if(cb!=null){ /axIIfx-
list.add(cb); &WNf
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} 22f`LoM
} 6mKjau{r_
} J'N!Omz
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CountControl.java @+ atBmt
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/* 5/po2V9)
* CountThread.java 5)
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* Bz5-ITX
* Created on 2007年1月1日, 下午4:57 >yY'7Ey
* XJLQ{
* To change this template, choose Tools | Options and locate the template under &QhX1dT+
* the Source Creation and Management node. Right-click the template and choose 3e(ehLc4DJ
* Open. You can then make changes to the template in the Source Editor. s}N#n(
*/ u|4$+QiD
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package com.tot.count; /4xki_}
import tot.db.DBUtils; k?2k'2dy
import java.sql.*; R'S0 zp6
/** sg+uBCGB
* (PfqRk1Y
* @author Yv:55+ e!|
*/ ,\qs4&
public class CountControl{ e^ v.)
private static long lastExecuteTime=0;//上次更新时间 |g=="
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V*W;OiE_3
/** Creates a new instance of CountThread */ b$Vz2Fzx
public CountControl() {} U#3J0+!
public synchronized void executeUpdate(){ cK 06]-Y
Connection conn=null; Unsogd
PreparedStatement ps=null; Vb9',a?#n
try{ 6P';DB
conn = DBUtils.getConnection(); kYLM&&h
conn.setAutoCommit(false); IEU^#=n
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); F$[ U|%*
for(int i=0;i<CountCache.list.size();i++){ 4._(|
CountBean cb=(CountBean)CountCache.list.getFirst(); >Jp:O
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CountCache.list.removeFirst(); %Q.&ZhB
ps.setInt(1, cb.getCountId()); L(U"U#QZ
ps.executeUpdate();⑴ d9q(xZ5
//ps.addBatch();⑵ gCxAG
} .-<k>9S7_
//int [] counts = ps.executeBatch();⑶ C*`mM'#
conn.commit(); Dq)j:f#QM
}catch(Exception e){ %*\es7m}
e.printStackTrace(); ;$z$@@WC
} finally{ CP6LHkM9
try{ NOp609\^
if(ps!=null) { O9r>E3-q
ps.clearParameters(); HQB(*
ps.close(); 0X^Ke(/89
ps=null; ;s52{>&F]
} eGX%KT"O
}catch(SQLException e){} Ud!4"<C_
DBUtils.closeConnection(conn); .B\ 5OI,]
} L =8rH5
} 7P9=)$(EH
public long getLast(){ W16,Alf:
return lastExecuteTime; C?2'+K
} G8;w{-{m
public void run(){ ,13Lq-
long now = System.currentTimeMillis(); R~ZFy0
if ((now - lastExecuteTime) > executeSep) { kSDZZx
//System.out.print("lastExecuteTime:"+lastExecuteTime); PnoPbk[<
//System.out.print(" now:"+now+"\n"); T,VY.ep/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ObiT-D?)g
lastExecuteTime=now; Dre]AsgiV
executeUpdate(); ;
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} TsGE cxIg
else{ ma((2My'H
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); X#e1KZ
} nI*v820,
} >>5NX"{
} =|YxDas
//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 8:/e
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类写好了,下面是在JSP中如下调用。 QI3Nc8t_2
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<% IzpZwx^3''
CountBean cb=new CountBean(); 1Y]TA3:
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]~E0gsq
CountCache.add(cb); EeF'&zE-
out.print(CountCache.list.size()+"<br>"); 6#Q K%[1!>
CountControl c=new CountControl(); a$Cdhx!
c.run(); 3fh8$A
out.print(CountCache.list.size()+"<br>"); "1HRLci
%>