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: OoTMvZP[
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CountBean.java |k3ZdM
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/* 8nw_Jatk1
* CountData.java .t|vwx
* U`sybtuBP'
* Created on 2007年1月1日, 下午4:44 VU`aH9g3(
* z8FeL5.(
* To change this template, choose Tools | Options and locate the template under yg\bCvL&
* the Source Creation and Management node. Right-click the template and choose KW|X\1H
* Open. You can then make changes to the template in the Source Editor. )3PQ|r'
*/ xTNWT_d
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package com.tot.count; n Bv|5$w:
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/** O?|opD
* 26 un=
* @author ~.7r
*/ <X~
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public class CountBean { {^ 1s
private String countType; JnE\E(ez
int countId; .q#2 op
/** Creates a new instance of CountData */ hGyi@0
public CountBean() {} c<)C3v
public void setCountType(String countTypes){ :J` *@cDn
this.countType=countTypes; |uVhfD=NG
} ! 4 `any
public void setCountId(int countIds){ I_N(e|s\U
this.countId=countIds; fvccut;K
} 7JNhCOBB
public String getCountType(){ W#!![JDc
return countType; -I4-K%%B`
} LyR to
public int getCountId(){ ?LAKH$t
return countId; G>f-w F6
} 7@al)G;~
} MFO}E!9`q
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CountCache.java $$`E@\5P
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/* "mr;|$Y
* CountCache.java l&cYN2T
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* C^I h"S
* Created on 2007年1月1日, 下午5:01 }
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* {tn%HK">
* To change this template, choose Tools | Options and locate the template under 8 St`,Tq)
* the Source Creation and Management node. Right-click the template and choose +Z[(s!
* Open. You can then make changes to the template in the Source Editor. /~*U'.V
*/ d51l7't
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package com.tot.count; w
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import java.util.*; cU7 c}?J<
/** )>08{7
* mwLp~z%OX
* @author Kt3/C'zu
*/ *L>gZ`Q
public class CountCache { jz(}P8
public static LinkedList list=new LinkedList(); NMb`d0;(
/** Creates a new instance of CountCache */ Cc^`M9dP
public CountCache() {} b$)b/=2
public static void add(CountBean cb){ P<yd
if(cb!=null){ \:ntqj&A|
list.add(cb); }TD$!
} 7Fb |~In<Z
} tn};[r
} K|
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CountControl.java fbp6lE
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/* Pda(O;aNU
* CountThread.java F3[3~r
* PW)XDo7
* Created on 2007年1月1日, 下午4:57 I;kKY
* is_`UDaB
* To change this template, choose Tools | Options and locate the template under f.rc~UI?
* the Source Creation and Management node. Right-click the template and choose O.4ty)*
* Open. You can then make changes to the template in the Source Editor. (m|w&oA/
*/ fhlhlOg
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package com.tot.count; r
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import tot.db.DBUtils; vB(tpki|
import java.sql.*; eED Fm
/** * bx%hX
* .lm^ +1}r
* @author lgp-/O"T
*/ biFy*+|
public class CountControl{ .nX+!EXeS
private static long lastExecuteTime=0;//上次更新时间 PEZ~og:w
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [|<2BQX
/** Creates a new instance of CountThread */ RGy4p)z*+
public CountControl() {} }|>mR];
public synchronized void executeUpdate(){ zM?JLNs]<{
Connection conn=null; Vh1{8'GQ
PreparedStatement ps=null; `iuo([E d
try{ }ybveZxv5A
conn = DBUtils.getConnection(); @+1-_Q`s/R
conn.setAutoCommit(false); m'H%O-h\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); v7"' ^sZ?
for(int i=0;i<CountCache.list.size();i++){ Wi ]Mp7b
CountBean cb=(CountBean)CountCache.list.getFirst(); ]0<T,m Z
CountCache.list.removeFirst(); cd,)GF
ps.setInt(1, cb.getCountId()); s\g"~2+
ps.executeUpdate();⑴ CbTYt6DC
//ps.addBatch();⑵ 6u^MfOc
} $r} )j~c
//int [] counts = ps.executeBatch();⑶ M; *f(JY$
conn.commit(); bm9@A]yP
}catch(Exception e){ n`<YhV
e.printStackTrace(); w]Z*"B&h
} finally{ E?san;Ku
try{ n|5+HE4@
if(ps!=null) { 4r5trquC
ps.clearParameters(); d7Lna^
ps.close(); O}\$E{-
ps=null; n]G!@-z
} $rFLhp}
}catch(SQLException e){} bp Q/#\Z
DBUtils.closeConnection(conn); ;~Y0H9`
} Stqlp<xy
} ;A)w:"m
public long getLast(){ p<IMWe'tP
return lastExecuteTime; 7,U^v}$
} ?:F#WDD
public void run(){ Iqe=)
long now = System.currentTimeMillis(); U6V+jD}L]
if ((now - lastExecuteTime) > executeSep) { ``bIqY
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9A0wiKp
//System.out.print(" now:"+now+"\n"); )=6|G^
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); $OMTk
lastExecuteTime=now; P+00wbx0
executeUpdate(); 0 =#)-n
} h6c0BmS{1
else{ 1s5FjD?M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); lJHV c"*/
} WO{V,<;
} hd*bPj;
} Cisv**9
//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 $oKT-G
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类写好了,下面是在JSP中如下调用。 b
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<% f4Aevh:
CountBean cb=new CountBean(); uN1(l}z$
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); OrN>4S
CountCache.add(cb); (}1 gO
out.print(CountCache.list.size()+"<br>"); \]pRu"
CountControl c=new CountControl(); ;ew j
c.run(); c zTr_>
out.print(CountCache.list.size()+"<br>"); aq/'2U 7
%>