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: Gl4f:`
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CountBean.java Xk :_aJ
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/* 0|mCk
* CountData.java BtF7P}:MGf
* `nd$6i^#W
* Created on 2007年1月1日, 下午4:44 s +0S,?{$
* "Qk)EY
* To change this template, choose Tools | Options and locate the template under .sZ"|j9m
* the Source Creation and Management node. Right-click the template and choose Wm!cjGK
* Open. You can then make changes to the template in the Source Editor. \5#eBJ
*/ IRsyy\[kp8
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package com.tot.count; /vLW{ %
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/** .aC/ g?U
* 7Y
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* @author AD7&-=p&w
*/ 0>3Sn\gZ(
public class CountBean { F ^)(
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private String countType; ( n!8>>+1C
int countId; rL/H{.@$`
/** Creates a new instance of CountData */ `Js"*[z
public CountBean() {} [n$6T
public void setCountType(String countTypes){ %\1W0%w
this.countType=countTypes; O~5*X f
} ,UxAHCR~9
public void setCountId(int countIds){ *3(mNpi{_
this.countId=countIds; T?*f}J
} riSgb=7q9
public String getCountType(){ M
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return countType; lG`%4}1
} .6pVt_f0/
public int getCountId(){ `dgZ `#
return countId; 1+Q@RiW
} S0lt_~
} XrGP]k6.^
% 3<7HY]~
CountCache.java 15kkf~Z<t
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/* @h%Nn)QBq
* CountCache.java dTQW /kAHQ
* To,*H OP
* Created on 2007年1月1日, 下午5:01 ]4,eCT
* z7HM/<WY
* To change this template, choose Tools | Options and locate the template under ugs9>`fF&
* the Source Creation and Management node. Right-click the template and choose L1QDA}6?_Y
* Open. You can then make changes to the template in the Source Editor. Eo0/cln|
*/ rouaT
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package com.tot.count; T:*l+<?
import java.util.*; j;EH[3
/** ZtX
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* KAnq8B!h
* @author (JT
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*/ Pk`3sfz
public class CountCache { 3yLJWHO%W
public static LinkedList list=new LinkedList(); U<6+2y P
/** Creates a new instance of CountCache */ 9[:TWvd
public CountCache() {} #1p\\Av
public static void add(CountBean cb){ 5p~hUP]tT
if(cb!=null){ SnY{|
list.add(cb); sV]I]DR
} D/Py?<n-B
} 2~%^y6lR
} *_K*GCy
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CountControl.java ,k}(]{ -
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/* G|z%T`!U1;
* CountThread.java #@P0i^pFTB
* V}Ce3wgvA
* Created on 2007年1月1日, 下午4:57 FQ u c}A
* *eMMfxFl
* To change this template, choose Tools | Options and locate the template under !iW>xo
* the Source Creation and Management node. Right-click the template and choose 8Y/1+-
* Open. You can then make changes to the template in the Source Editor. %m-U:H.Vp
*/ 8;x0U`}Ez(
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package com.tot.count; +.QJZo_
import tot.db.DBUtils; YRU95K[
import java.sql.*; H'&[kgnQ@
/** /25Ay
* ,OFNV|S$
* @author yV*4|EkvW
*/ m"wP]OQH*+
public class CountControl{ 5 &0qr$
private static long lastExecuteTime=0;//上次更新时间 .Gb!mG
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Y;kiU
/** Creates a new instance of CountThread */ b8glZb*$
public CountControl() {} gKtgW&PYm
public synchronized void executeUpdate(){ =X7_!vSv
Connection conn=null; U+&Eps&NI
PreparedStatement ps=null; xL"O~jTS
try{ t$rla_rbY
conn = DBUtils.getConnection(); k`J|]99Wb
conn.setAutoCommit(false); \t)`Cp6,[b
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ]AX3ov6z9;
for(int i=0;i<CountCache.list.size();i++){ \;JZt[
CountBean cb=(CountBean)CountCache.list.getFirst(); S:1g(f*85
CountCache.list.removeFirst(); mp
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ps.setInt(1, cb.getCountId()); ~JO.h$1C
ps.executeUpdate();⑴ >~_)2_j
//ps.addBatch();⑵ eg24.W9c
} N! I$Qtr,
//int [] counts = ps.executeBatch();⑶ R[OXYHu
conn.commit(); MfO:BX@$
}catch(Exception e){ J M`[|"R%
e.printStackTrace(); Rx?ze(
} finally{ I
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try{ *q+X?3
if(ps!=null) { G=|~SYz
ps.clearParameters(); oXUb_/
ps.close(); L+}<gQJ(
ps=null; LL==2KNUo
} /*MioaQB}p
}catch(SQLException e){} ]'pL*&"X
DBUtils.closeConnection(conn); 1x%B`d
}
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} n}c~+0`un
public long getLast(){ bAwKmk9C
return lastExecuteTime; L@Q+HN
} 8 [D"
public void run(){ qw{`?1[+
long now = System.currentTimeMillis(); x_r*<?OZ
if ((now - lastExecuteTime) > executeSep) { hw(\3h()
//System.out.print("lastExecuteTime:"+lastExecuteTime); B<0Kl.V
//System.out.print(" now:"+now+"\n"); -!}3bl*(7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); n#@ Qd!uzM
lastExecuteTime=now; ;%;||?'v
executeUpdate(); F~eY'~&H}
} -+0kay%
else{ ^b.#4i(v
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 6[SIDOp*^
} b`@J"E}
} 7VL|\^Y `q
} &xUD(
//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 qHvUBx0
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类写好了,下面是在JSP中如下调用。 wE}Wh5
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<% W1EYVXN
CountBean cb=new CountBean(); N1B$z3E*
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); XK})?LTD
CountCache.add(cb); Keem\/
out.print(CountCache.list.size()+"<br>"); Np aS2q-d
CountControl c=new CountControl(); IdK<:)Q
c.run(); n2EPx(~
out.print(CountCache.list.size()+"<br>"); PcqS#!t
%>