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: Ue,eEer
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CountBean.java #\Q)7pgi.
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/* F/A)2 H_
* CountData.java CnY dj~
* 4U)%JK.ta
* Created on 2007年1月1日, 下午4:44 $1)NYsSH/H
* Sqmjf@o$>
* To change this template, choose Tools | Options and locate the template under /Z#AHfKF
* the Source Creation and Management node. Right-click the template and choose 93w$ck},?G
* Open. You can then make changes to the template in the Source Editor. e*Nm[*@UW
*/ MfLus40;n
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package com.tot.count; EOqV5$+
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/** >2mY%
* aOoWB^;6
* @author 6w{""K.{
*/ cY~lDLyB
public class CountBean { uSCI
private String countType; O,J,Q|`H&
int countId; ov!L8
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/** Creates a new instance of CountData */ !g>mjD
public CountBean() {} 5=8_Le
public void setCountType(String countTypes){ GWj !n
this.countType=countTypes; T~}g{q,tR
} X/Fip0i
public void setCountId(int countIds){ ={ 190=\9
this.countId=countIds; Pm24;'
} J(XK%e[8
public String getCountType(){ nu|odP
return countType; zCwb>v
} F>@z&a}(
public int getCountId(){ d+eb![fi
return countId; W`wT0kP?*]
} `wLmGv+V
} 2V+[:>F
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CountCache.java W$" >\A0%
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/* tE=$#
* CountCache.java +#'QP#
* Xd~li fF
* Created on 2007年1月1日, 下午5:01 .N#grk)C
* zq#gf
* To change this template, choose Tools | Options and locate the template under ooYs0/,{
* the Source Creation and Management node. Right-click the template and choose O,I7M?dRf
* Open. You can then make changes to the template in the Source Editor. hM(Hq4ed,
*/ Qcs0w(
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package com.tot.count; =&U7:u
import java.util.*; N9f;X{
/** 5hiuBf<
* zjx'nK{eI
* @author QO,ge<N+N
*/ .7#04_aP
public class CountCache { UZc{ Av
public static LinkedList list=new LinkedList(); LA837%)
/** Creates a new instance of CountCache */ C9T-4o1
public CountCache() {} gD6BPW~0
public static void add(CountBean cb){ a4!6K
if(cb!=null){ <,T#* fg
list.add(cb); @eDL j}
} yucbEDO.
} >LR+dShG
} BQ~&gy{
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CountControl.java =(5}0}j
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/* b@[5xv\J
* CountThread.java ~x+24/qT
* TUO#6
* Created on 2007年1月1日, 下午4:57 Zxv{qbF
* @/?$ ZX/e[
* To change this template, choose Tools | Options and locate the template under pM@0>DVi
* the Source Creation and Management node. Right-click the template and choose opxPK=kJ
* Open. You can then make changes to the template in the Source Editor. ga91#NWgK
*/ ';x5 $5k'
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package com.tot.count; MXpj_+@
import tot.db.DBUtils; m=IA/HOR^
import java.sql.*; K:sC6|wG
/** 1FC1*7A[
* a,p7l$kK
* @author !1?Nc}T0Q&
*/ *
@j#13.
public class CountControl{ nr{}yQu
private static long lastExecuteTime=0;//上次更新时间 K fNR)
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 s^AZ)k~J(
/** Creates a new instance of CountThread */ 3sGe#s%
public CountControl() {} noNL.%I
public synchronized void executeUpdate(){ ~7=w,+
Connection conn=null; Wv)2dD2I
PreparedStatement ps=null; C[(Exe
try{ `L}Irt}
conn = DBUtils.getConnection(); N+ R/ti
conn.setAutoCommit(false); P!2[#TL0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,t>/_pI+=
for(int i=0;i<CountCache.list.size();i++){ @AkD-}^[
CountBean cb=(CountBean)CountCache.list.getFirst(); !7[Rhk7bW
CountCache.list.removeFirst(); dCMWv~>
ps.setInt(1, cb.getCountId()); l.i&.;f
ps.executeUpdate();⑴ C{):jH,Rf
//ps.addBatch();⑵ y#;@~S1W
} [mk!]r
//int [] counts = ps.executeBatch();⑶ 0IjQqI
conn.commit(); "Mmvf'N
}catch(Exception e){ Ndx ]5
e.printStackTrace(); 4;d9bd)A
} finally{ .W%{j()op
try{ ;zvg] %
if(ps!=null) { =Wk!mGc
ps.clearParameters(); u7<s_M3%N
ps.close(); A@"CrVE
ps=null; Lpdp'9>I
} m)?cXM
}catch(SQLException e){} eJ!a8
DBUtils.closeConnection(conn); D8Vb@5MW
} T|[o
} "n@=.x
public long getLast(){ iP JZ%
return lastExecuteTime; 8[;U|SR"
} -xf=dzm)
public void run(){ fKAG+ t
long now = System.currentTimeMillis(); 8aD4wc
if ((now - lastExecuteTime) > executeSep) { `ja**re
//System.out.print("lastExecuteTime:"+lastExecuteTime); "-TIao#
//System.out.print(" now:"+now+"\n");
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); dKyX70Zy9
lastExecuteTime=now; %k3a34P@
executeUpdate(); qN_jsJ
} T=2 91)@
else{ x3my8'h@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KdOy3O_5N
} ]7^YPFc+
} ef!V EtEOv
} BY$%gIB6>
//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 ,Tyh._sa
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类写好了,下面是在JSP中如下调用。 ~z!U/QR2
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<% !W8'apG&[
CountBean cb=new CountBean(); rf8`|9h"7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "sRR:wzQu
CountCache.add(cb); A_@#V)D2
out.print(CountCache.list.size()+"<br>"); .
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CountControl c=new CountControl(); p]#%e0
c.run(); /\_ s
out.print(CountCache.list.size()+"<br>"); fF8g3|p:
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