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: -b(DPte
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CountBean.java 1UP=(8j/
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/* a#YK1n[!
* CountData.java zfeT>S+
* !@ ^6/=
* Created on 2007年1月1日, 下午4:44 J7`mEL>?
* +xFn~b/
* To change this template, choose Tools | Options and locate the template under *;o%*:
* the Source Creation and Management node. Right-click the template and choose 6p9fq3~7Y
* Open. You can then make changes to the template in the Source Editor. HEF
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*/ g'(bk@<BP
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package com.tot.count; k6(7G@@}
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/** ZEP?~zV\A
* g^'h4qOa
* @author ,&P
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*/ VfX^iG r
public class CountBean { g4IF~\QRVi
private String countType; lB,1dw2(T
int countId; w&p+mJL.
/** Creates a new instance of CountData */ 3
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public CountBean() {} 4b8G 1fm
public void setCountType(String countTypes){ 9L=mS
this.countType=countTypes; 7*!7EBb
} 95l)s],
public void setCountId(int countIds){ u\]EG{w(
this.countId=countIds; !_S#8"
} ~||0lj.D
public String getCountType(){ 6hxZ5&;(*
return countType; a+w2cN'
} QNj]wm=mp
public int getCountId(){ Re$h6sh
return countId; G;Li!H
} Nd~B$venh
} s2;~FK#/
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CountCache.java G{U#9
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/* XB)D".\
* CountCache.java $|N6I
* M.W
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* Created on 2007年1月1日, 下午5:01 T
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* (bsx|8[
* To change this template, choose Tools | Options and locate the template under |&; ^?M
* the Source Creation and Management node. Right-click the template and choose QL?_FwZL
* Open. You can then make changes to the template in the Source Editor. z
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*/ 0HzqU31%l@
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package com.tot.count; 77P\:xc
import java.util.*; <J/ =$u/
/** ma.84~m
* i?x gV_q;
* @author mMAN*}`O
*/ ?Nos;_/
public class CountCache { 8Zr;n`~
public static LinkedList list=new LinkedList(); q~ H>rC(\
/** Creates a new instance of CountCache */ x/*lNG/
public CountCache() {} to={q
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public static void add(CountBean cb){ dljE.peL
if(cb!=null){ :Sq]|)
list.add(cb); )GD7rsC`<
} &d_^k.%y
} WR;1
} HK;NR.D
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CountControl.java (Ou%0
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/* kp m;ohd
* CountThread.java b9bIvjm_
* M5dYcCDE
* Created on 2007年1月1日, 下午4:57 NkZG
* bZqTT~'T
* To change this template, choose Tools | Options and locate the template under J=g)rd[`
* the Source Creation and Management node. Right-click the template and choose O2w-nd74U
* Open. You can then make changes to the template in the Source Editor. zF1!a
*/ Abc{<4 z0?
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package com.tot.count; FK%b@/7s~
import tot.db.DBUtils; OF-k7g7
import java.sql.*; ~tDYo)hH8
/**
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* 7sot?gF
* @author jLAEHEs
*/ z0z@LA4k6@
public class CountControl{ Qb536RpcTY
private static long lastExecuteTime=0;//上次更新时间 E&M(QX5
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 c;l!i-
/** Creates a new instance of CountThread */ XiUq#84Q
public CountControl() {} UP~28%>X
public synchronized void executeUpdate(){ `m,4#P-kj
Connection conn=null; (MwRe?Ih
PreparedStatement ps=null; ,}oAc
try{ ;Afz`Se1@
conn = DBUtils.getConnection(); p~D}Iyww1_
conn.setAutoCommit(false); djd/QAfSC
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )U/jD
for(int i=0;i<CountCache.list.size();i++){ R9J!}az'
CountBean cb=(CountBean)CountCache.list.getFirst(); J9^NHU
CountCache.list.removeFirst(); #Hw|P
ps.setInt(1, cb.getCountId()); ?CpVA
ps.executeUpdate();⑴ E C#0-,z
//ps.addBatch();⑵ d"wA"*8~y
} G|6qL
//int [] counts = ps.executeBatch();⑶ 77>oQ~q
conn.commit(); 8mI(0m'
}catch(Exception e){ 0At0`Q#
e.printStackTrace(); @8d 3
} finally{ m1$tf
^
try{ I^NDJdxd
if(ps!=null) { !T6R[
ps.clearParameters(); Oa|c ?|+
ps.close(); 9*qwXU_aV
ps=null; c=m'I>A
} 1IXtu
}catch(SQLException e){} )Z7Vm2a
DBUtils.closeConnection(conn); X\^V{v^-
} wJp<ZL
} hnj\|6L
public long getLast(){ ,9&cIUH
return lastExecuteTime; !_fDL6a-
} WAu>p3
public void run(){ NxP(&M(
long now = System.currentTimeMillis(); &:&'70Ya
if ((now - lastExecuteTime) > executeSep) { *z0!=>(
//System.out.print("lastExecuteTime:"+lastExecuteTime);
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//System.out.print(" now:"+now+"\n"); |T:R.=R$~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8$( I! ;
lastExecuteTime=now; Qqm?%7A1
executeUpdate(); C}huU
} -/f$s1
else{ *+M#D^qo
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {j2V k)\[i
} mLCDN1UO{
} }b_Ob
} #QNN;&L]R
//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 AA\a#\#Z3
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类写好了,下面是在JSP中如下调用。 Q}BMvR 9w
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<% VAPeMO
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CountBean cb=new CountBean(); U]PB)
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ">V1II
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CountCache.add(cb); >|f"EK}m!
out.print(CountCache.list.size()+"<br>"); l\<.*6r
CountControl c=new CountControl(); fO<40!%9cQ
c.run(); @16GF!.
out.print(CountCache.list.size()+"<br>"); rN0<y4)!
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