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: DFhXx6]
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CountBean.java NN0$}ac p
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/* <IW#ME
* CountData.java uw\2qU3gk
* WW+l' 6.
* Created on 2007年1月1日, 下午4:44 @`tXKP$so
* >Vy>O&r
* To change this template, choose Tools | Options and locate the template under }i{sg#
* the Source Creation and Management node. Right-click the template and choose dzK{
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* Open. You can then make changes to the template in the Source Editor. [b{CkX06
*/ yR{x}DbG
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package com.tot.count; Uv
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/** )jWOP,|
* [7(-T?_
* @author vZ/6\Cz
*/ xtPLR/Z
public class CountBean { r`)L~/
private String countType; )X4K2~k*
int countId; qq)0yyL r
/** Creates a new instance of CountData */ ikWtC]y
public CountBean() {} DeR='7n
public void setCountType(String countTypes){ D=:04V}2+
this.countType=countTypes; yC
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} UnVm1ZWZ
public void setCountId(int countIds){ .@
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this.countId=countIds; %r&-gWTQ,
} 4Mk-2 Dx
public String getCountType(){ zR!o{8
return countType; z
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} KH\b_>wU2
public int getCountId(){ o6f_l^+H
return countId; dz~co Z9
} ,q(&)L$S
} bjAnaya
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CountCache.java eC5 $#,HiC
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/* $+.l*]
* CountCache.java $$:ZX
* tXJUvish
* Created on 2007年1月1日, 下午5:01 BCe_@
* aP'"G^F
* To change this template, choose Tools | Options and locate the template under 0]D0{6x8
* the Source Creation and Management node. Right-click the template and choose 8|E'>+ D_-
* Open. You can then make changes to the template in the Source Editor. n wI!O
*/ BpX6aAx
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package com.tot.count; LZMYr
import java.util.*; Z3[S]jC
/** ,=?{("+
* "[}O"LTQ
* @author ngj,x7t
*/ L4uFNM]
public class CountCache { OL_{_K(w
public static LinkedList list=new LinkedList(); Bgmn2-
/** Creates a new instance of CountCache */ E}%hz*Q)(
public CountCache() {} R/"x}B1d
public static void add(CountBean cb){ qfcYE=
if(cb!=null){ P0`Mdk371
list.add(cb); Xl@cHO=i
} Z|RY2P>E
} Xf)|Pu
} iH^z:%dP
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CountControl.java &3J@BMYp
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/* 1-.~7yC
* CountThread.java p4V eRJk%
* N'xSG`,Mg
* Created on 2007年1月1日, 下午4:57 (E]!Z vE
* A(]H{>PMy
* To change this template, choose Tools | Options and locate the template under v]B
L[/4
* the Source Creation and Management node. Right-click the template and choose ;S xFp
* Open. You can then make changes to the template in the Source Editor. VLBE'3Qg1
*/ 5k|9gICyd*
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package com.tot.count; qRbf2;
import tot.db.DBUtils; 8w({\=
import java.sql.*; ;gC|
/** u&wiGwF[
* 7)h[Zy,A
* @author ?f/n0U4w
*/ fib}b?vk
public class CountControl{ 9n}p;3{f
private static long lastExecuteTime=0;//上次更新时间 !|c|o*t{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +2 Af&~T
/** Creates a new instance of CountThread */ OT'[:|x ;
public CountControl() {} C"IKt
public synchronized void executeUpdate(){ ja=F 7Usb
Connection conn=null; 1~$);US
PreparedStatement ps=null; #97h6m?
try{ u.rY#cS,-R
conn = DBUtils.getConnection(); wf1lyS
conn.setAutoCommit(false); &~CY]PN.
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ePIiF_X
for(int i=0;i<CountCache.list.size();i++){ ah~YeJp
CountBean cb=(CountBean)CountCache.list.getFirst(); ,^icPQSwc
CountCache.list.removeFirst(); MQin"\
ps.setInt(1, cb.getCountId()); {nU=%w"\
ps.executeUpdate();⑴ {}:ToIp
//ps.addBatch();⑵ OzC\9YeA
} 'U'yC2BI n
//int [] counts = ps.executeBatch();⑶ .5
conn.commit(); h<~7"ONhV
}catch(Exception e){ Le%ZV%,
e.printStackTrace(); wj[$9UJb
} finally{ 0Ia($.1mY
try{ 7t.!lh5G%
if(ps!=null) { KD^N)&k^Kp
ps.clearParameters(); ZoArQ(YFy
ps.close(); dK>7fy;mv
ps=null; trE{ FT
} ZcYh) HD
}catch(SQLException e){} :T9<der,
DBUtils.closeConnection(conn); %u;~kP|S%
} Pb*5eXk
} S8e{K
public long getLast(){ ^U]UqX`
return lastExecuteTime; [V:\\$
} " LJq%E
public void run(){ XkyKBg-
long now = System.currentTimeMillis(); n@ G[
if ((now - lastExecuteTime) > executeSep) { >ooZj9:'
//System.out.print("lastExecuteTime:"+lastExecuteTime); qTQBt}
//System.out.print(" now:"+now+"\n"); z3uW)GQ.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); yv)ux:P&+
lastExecuteTime=now; d:yqj:
executeUpdate(); "?mJqA
} 2U-3Q]/I}
else{ [LRLJ_~g5
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /a6Xa&(B
} '}Ri`
} S]E.KLR?[;
} ur$l Z0
//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 [|l?2j\
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类写好了,下面是在JSP中如下调用。 t'ZWc\
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<% S6[v;{xJ
CountBean cb=new CountBean(); 36am-G
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); p0pWzwTG3
CountCache.add(cb); @}kv-*
out.print(CountCache.list.size()+"<br>"); VcoOeAKL
CountControl c=new CountControl(); <jed!x
c.run(); dXnl'pFS
out.print(CountCache.list.size()+"<br>"); 'MY/*k7:
%>