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: QwT]|
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CountBean.java _\]D<\St
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/* oSa FmP
* CountData.java 34;c00
* Ac7`nvI=
* Created on 2007年1月1日, 下午4:44 >D:S)"
*
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* To change this template, choose Tools | Options and locate the template under ljt1:@SN(
* the Source Creation and Management node. Right-click the template and choose 3:Z(tM&-O
* Open. You can then make changes to the template in the Source Editor. m]"YR_
*/ @bqCs^U35
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package com.tot.count; p*npY"}v
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/** "BFW&<1
* '|XP}V0I
* @author X2@o"xU
*/ $}KYpSV
public class CountBean { 2WUBJ-qnuT
private String countType; ^_+ks/
int countId; GU[Cq=k
/** Creates a new instance of CountData */ `=KrV#/758
public CountBean() {} zi-+@9T
public void setCountType(String countTypes){ 0a'@J~v!
this.countType=countTypes; ~!&[;EM<bm
} B:mlBSH
public void setCountId(int countIds){ .9^;? Ts
this.countId=countIds; (B$FX<K3
} q!ZmF1sU
public String getCountType(){ ]#:xl}'LS
return countType; \3LD^[qi
} qyJpm{
public int getCountId(){ FBY~Z$o0.
return countId; l&|{uk
} NXmj<azED
} teB{GR
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CountCache.java @H_LPn
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/* ,@!d%rL:4]
* CountCache.java WX=+\`NyJ(
* P)\f\yb
* Created on 2007年1月1日, 下午5:01 4Dd9cG,lN
* RsOK5XnQn
* To change this template, choose Tools | Options and locate the template under l:|Fs=\
* the Source Creation and Management node. Right-click the template and choose H~~(v52wD
* Open. You can then make changes to the template in the Source Editor. A&M/W'$s
*/ >u/yp[Ky
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package com.tot.count;
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import java.util.*; F"F(s!
/** KJ#c(yb9zR
* [`b{eLCFX]
* @author VuBp$H(U
*/ .XE]vo
public class CountCache { ?#[K&$}
public static LinkedList list=new LinkedList(); l2v}PALs
/** Creates a new instance of CountCache */ 3AL.UBj&}
public CountCache() {} $I/p 6
public static void add(CountBean cb){ Y$Ke{6 4
if(cb!=null){ GbE3:;JI
list.add(cb); 'q-h
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} 2?ednMoE
} ""a8eB6
} DVS7N_cx2o
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CountControl.java [<`+9R
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/* a;zcAeX
* CountThread.java avz 4&
* 8`~]9ej
* Created on 2007年1月1日, 下午4:57 ;'Q{ ywr
* (j/O=$mJ
* To change this template, choose Tools | Options and locate the template under 3TtW2h>M
* the Source Creation and Management node. Right-click the template and choose h
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* Open. You can then make changes to the template in the Source Editor. #.='dSj
*/ Xo5L:(?K
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package com.tot.count; aF=VJ+5
import tot.db.DBUtils; o MAK[$k;
import java.sql.*; 5jLDe~
/** t(yv
* #n7{ 3)
* @author i*tj@5MY-
*/ hJ@nW5CI
public class CountControl{ ^v'Lu!\f
private static long lastExecuteTime=0;//上次更新时间 k8JPu"R
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9x1Dyz 2?F
/** Creates a new instance of CountThread */ q ^gEA5
public CountControl() {} H:_`]X"
public synchronized void executeUpdate(){ RW)C<g
Connection conn=null; L; ~=(
PreparedStatement ps=null; pi{ahuI#_o
try{ *Tlv'E.M
conn = DBUtils.getConnection(); 72 6y/o
conn.setAutoCommit(false); k?#6j1pn
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 40E[cGz$*
for(int i=0;i<CountCache.list.size();i++){ E*l"uV
CountBean cb=(CountBean)CountCache.list.getFirst(); ;:4puv+]
CountCache.list.removeFirst(); )'g vaT
ps.setInt(1, cb.getCountId()); >xjy
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ps.executeUpdate();⑴ g;h&Xkp
//ps.addBatch();⑵ 9T1G/0k-
} 0d2%CsMS"D
//int [] counts = ps.executeBatch();⑶ tFQFpbI
conn.commit(); $3ILVT
}catch(Exception e){ KOQTvJ_#
e.printStackTrace(); Bz{
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} finally{ Vh8uE
try{ iiTUhO )
if(ps!=null) { e'Pa@]VaC
ps.clearParameters(); [ n2udV
ps.close(); +=_Pl7?
ps=null; 7`}z7nk
} P33E\O
}catch(SQLException e){} q|l|gY1g)
DBUtils.closeConnection(conn); ^bG!k]U!2
} (G VGoh&
} )3AT=b
public long getLast(){ Z7^}G=*
return lastExecuteTime; #O
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} X`b5h}c
public void run(){ [oj"Tn(
long now = System.currentTimeMillis(); UU;:x"4
if ((now - lastExecuteTime) > executeSep) { z#4g,)ZX
//System.out.print("lastExecuteTime:"+lastExecuteTime); 7'S]
//System.out.print(" now:"+now+"\n"); =-qsz^^a-
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); v`&Z.9!Tz^
lastExecuteTime=now; x_K%
executeUpdate(); ~ #CCRUhM
} J (h>
else{ 1%,Z&@^j
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); l_c?q"X
} y6/X!+3+
} CkU=0mcY
} Q\76jD`m\
//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 iIFQRnpu;3
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类写好了,下面是在JSP中如下调用。 Ub,unU
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<% {76!
CountBean cb=new CountBean(); R=PzR;8
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^ne8~
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CountCache.add(cb); meR2"JN'
out.print(CountCache.list.size()+"<br>"); MlFvDy
CountControl c=new CountControl(); jGn^<T\
c.run(); Qx;A; n!lw
out.print(CountCache.list.size()+"<br>"); 7o. 'F
%>