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: 'UhoKb_p
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CountBean.java ea3w
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/* Qte5E}V`
* CountData.java =g#PP@X]D!
* ]rG=\>U3~
* Created on 2007年1月1日, 下午4:44 FZ-Wgh
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* =6sP`:
* To change this template, choose Tools | Options and locate the template under 7[m+r:y
* the Source Creation and Management node. Right-click the template and choose 0+>g/>
* Open. You can then make changes to the template in the Source Editor. `d_T3^ayu
*/ 'Ea3(OsuXn
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package com.tot.count; n8,%<!F^
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/** gT)(RS`_)
* lJK]S=cd
* @author tia}&9;
*/ Ic/hVKYG5
public class CountBean { J}V4.R5d
private String countType; aq?bI:>8
int countId; 9)!Ksg(h
/** Creates a new instance of CountData */ AwJg/VBo)
public CountBean() {} 8SjCU+V
public void setCountType(String countTypes){ Id=20og
this.countType=countTypes; YgEd%Z%4
} /~"-q
public void setCountId(int countIds){ v`S5[{6
this.countId=countIds; i/X3k&
} %KyZ15_(-L
public String getCountType(){ xg p)G!
return countType; 4&*lpl*N
} y_WC"
public int getCountId(){ Oc)n,D)0
return countId; ufL,Kq4
} g#I`P&
} 3!P^?[p3
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CountCache.java e9p/y8gC
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/* 8{4'G$6
* CountCache.java !@z9n\Yj
* fk}Raej g
* Created on 2007年1月1日, 下午5:01 @fd<
* #aqnj+
* To change this template, choose Tools | Options and locate the template under / 4Q=%n
* the Source Creation and Management node. Right-click the template and choose h[(YH ;Y
* Open. You can then make changes to the template in the Source Editor. ^A ]4
*/ IjhRSrCv
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package com.tot.count; 2-F7tcya|
import java.util.*; +wQ5m8E
/** Ec7xwPk
* r9f- [wC
* @author \9+,ynJH8z
*/ I"]E}n d)
public class CountCache { YdI6|o@vc
public static LinkedList list=new LinkedList(); m-{DhJV
/** Creates a new instance of CountCache */ NZGO8u
public CountCache() {} whI4@#
public static void add(CountBean cb){ R&uPoY,f
if(cb!=null){ 7] y3<t
list.add(cb); cC8$ oCR?
} ihkZs3}
}
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} g!0
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CountControl.java xbiprhdv
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/* >Iij,J5i
* CountThread.java 2?,lr2
* dwn|1%D
* Created on 2007年1月1日, 下午4:57 r,eH7&P9{
* q;SD+%tI
* To change this template, choose Tools | Options and locate the template under v=^^Mr"Z^
* the Source Creation and Management node. Right-click the template and choose VmQ^F|
{
* Open. You can then make changes to the template in the Source Editor. rbf5~sw&8+
*/ mpYBMSLM
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package com.tot.count; " lD -*e4
import tot.db.DBUtils; R5sEQ| E
import java.sql.*; C5=^cH8
/** puOMtCI
* #7fOH
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* @author x.gz sd
*/ |mhKD#:
public class CountControl{ oX6Cd:c-
private static long lastExecuteTime=0;//上次更新时间 $bp'b<jx
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 D u<P^CE
/** Creates a new instance of CountThread */ ~Dg:siw
public CountControl() {} ?3DL .U{
public synchronized void executeUpdate(){ :/->m6C`0
Connection conn=null; !UzE&CirV
PreparedStatement ps=null; ,vR>hyM
try{ v0'z''KM!
conn = DBUtils.getConnection(); Mx}r! Q
conn.setAutoCommit(false); 0o/;cBH
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); z7fX!'3V
for(int i=0;i<CountCache.list.size();i++){ +^:uPW^U
CountBean cb=(CountBean)CountCache.list.getFirst(); OBF M70K
CountCache.list.removeFirst(); "4XjABJ4'
ps.setInt(1, cb.getCountId()); !@V]H
ps.executeUpdate();⑴ s\'t=}0q
//ps.addBatch();⑵ " "`z3-
} qA}l[:F+#
//int [] counts = ps.executeBatch();⑶ , wk}[MF
conn.commit(); dhLd2WSyH
}catch(Exception e){ # wn>S<
e.printStackTrace(); a aVq>$G3
} finally{ G>dXK,f<B0
try{ m<Gd 6V5
if(ps!=null) { "P5,p"k:)
ps.clearParameters(); :Nz
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ps.close(); `~axOp9N
ps=null; @>`N%wH'
} FkMM>X
}catch(SQLException e){} J;fbE8x
DBUtils.closeConnection(conn); 6T"5,Q</h
} FkaQVT
} <a
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public long getLast(){ Z){fie4WM
return lastExecuteTime; iLdUus!
} g9GPyU
public void run(){ =j_4!^
long now = System.currentTimeMillis(); !rx5i
if ((now - lastExecuteTime) > executeSep) { p+I`xyk
//System.out.print("lastExecuteTime:"+lastExecuteTime); :t;\`gQoS
//System.out.print(" now:"+now+"\n"); N]BH6 7<
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w&U28"i>
lastExecuteTime=now; :hHKm|1FE
executeUpdate(); UeUOGf ,
} Na\&}GSf^
else{ Xk^<}Ep)c
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "97sH_
,
} BAqwYWdS
} R]Fa?uQW
} 0Dd8c\J
//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 s$^ 2Cuhv
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类写好了,下面是在JSP中如下调用。 <{V{2V#
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<% ~LH).\V
CountBean cb=new CountBean(); n`Ypv{+ {%
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T5[(vTp
CountCache.add(cb); 7CT446
out.print(CountCache.list.size()+"<br>"); 0s4]eEXH
CountControl c=new CountControl(); gYL#} ) g
c.run(); DUf. F
out.print(CountCache.list.size()+"<br>"); %z1hXh#+
%>