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: o?b$}Qrl
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CountBean.java }ARWR.7Cc
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/* 'D-eFJ5
* CountData.java xV}E3Yj2#
* !3v!BJ#+,&
* Created on 2007年1月1日, 下午4:44 }?$d~]t)
* epJVs0W
* To change this template, choose Tools | Options and locate the template under K;,n?Q w
* the Source Creation and Management node. Right-click the template and choose +IK~a9t
* Open. You can then make changes to the template in the Source Editor. 8GN0487H
*/ gnlGL[r|
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package com.tot.count; *^ \xH ,.
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/** ~4.Tq{
* <QQgOaS`2
* @author ea3AcT6
*/ Z+' 7c|a
public class CountBean { BR8z%R
private String countType; ow:c$Zq
int countId; y;keOI!
/** Creates a new instance of CountData */ >#Y8#-$zc
public CountBean() {} %g^dB M#
public void setCountType(String countTypes){ vY7C!O/y_k
this.countType=countTypes; k=Pu4:RF
}
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public void setCountId(int countIds){ fCJ:QK!
this.countId=countIds; eY"y[
} `E8m>q Ss
public String getCountType(){ -d[9mS
return countType; 6{8qATLR
} q*{i /=~
public int getCountId(){ vE;`y46&r
return countId; H|tbwU)J
} Y
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} cAM1\3HWT"
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CountCache.java w{?nX6a@p
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/* _Xlf}BE
* CountCache.java 4};iL)
* 4 C/
* Created on 2007年1月1日, 下午5:01 q{n~v>wU
* 0\qbJ
* To change this template, choose Tools | Options and locate the template under w1KLQd:yq
* the Source Creation and Management node. Right-click the template and choose z2i?7)(?;A
* Open. You can then make changes to the template in the Source Editor. Fx~=mYU
*/ cR 4xy26s
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package com.tot.count; f]^(|*6
import java.util.*; 6k%N\!_TUW
/** F[ N{7C3
* W @Y$!V<
* @author \S[:
*/ j/TsHJ=
public class CountCache { -MbnYs)
public static LinkedList list=new LinkedList(); ?5K.#>{
/** Creates a new instance of CountCache */ FTI[YR8?Y
public CountCache() {} rV<yM$IA
public static void add(CountBean cb){ 2P`hdg
if(cb!=null){ 36`aG Y
list.add(cb); ^2mmgN
} oJ ,t]e*q=
} "[L[*>[9!
} ;Z-xum{
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CountControl.java lsCD%P
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/* *>n<7T0
* CountThread.java ~P
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* K||9m+
* Created on 2007年1月1日, 下午4:57 ;J Dn1(6
* ^*#5iT8/
* To change this template, choose Tools | Options and locate the template under [?r`8K2!,
* the Source Creation and Management node. Right-click the template and choose 1"RO)&
* Open. You can then make changes to the template in the Source Editor. &~:b&
*/ EjV,&7o)
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package com.tot.count; dms R>Q
import tot.db.DBUtils; ..UmbJJ.u
import java.sql.*; tu#VZAPW@
/** sn
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* +v2Fr}
* @author hC4##pAa
*/ rbS67--]
public class CountControl{ (s4w0z
private static long lastExecuteTime=0;//上次更新时间 }BlVLf%C
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 u7ZSs-LuHw
/** Creates a new instance of CountThread */ wo5"f}vd#
public CountControl() {} oJK1~;:
public synchronized void executeUpdate(){ v3x_8n$C9
Connection conn=null; /@gD
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PreparedStatement ps=null; |G&<@8O
try{ L(XGD
conn = DBUtils.getConnection(); y2gI]A
conn.setAutoCommit(false); 1`)ie%=
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); fWhw I+
for(int i=0;i<CountCache.list.size();i++){ xbnx*4o0
CountBean cb=(CountBean)CountCache.list.getFirst(); JaoRkl?F
CountCache.list.removeFirst(); 5"%r,GM U
ps.setInt(1, cb.getCountId()); 1Y6<i8
ps.executeUpdate();⑴ }` E5I&r4
//ps.addBatch();⑵ Rx<m+=
} 2Vas`/~u~
//int [] counts = ps.executeBatch();⑶ `*mctjSN
conn.commit(); R$X1Q/#md
}catch(Exception e){ }dX[u`zQ
e.printStackTrace(); >p [|U`>{
} finally{ %W~Kx_
try{ L}UJ`U
if(ps!=null) { vQ>x5\r5O_
ps.clearParameters(); 0+jR,5|
ps.close(); X|^E+
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ps=null; ,+-l1GpL
} 8u
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}catch(SQLException e){} X1?7}VO
DBUtils.closeConnection(conn); _)
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} 3 GmU$w
} U+>!DtOYK
public long getLast(){ X<dQq`kZ
return lastExecuteTime; td%]l1
} JV(qTb W
public void run(){ j9)P3=s
long now = System.currentTimeMillis(); NNLZ38BV7
if ((now - lastExecuteTime) > executeSep) { 6d& dB
//System.out.print("lastExecuteTime:"+lastExecuteTime); 3`uv/O2~i
//System.out.print(" now:"+now+"\n"); )8VrGg?
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); U??P
lastExecuteTime=now; U\a.'K50F
executeUpdate(); CG*eo!Nw
} 3B!lE(r%J
else{ nAPSs]D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); {G&*\5W
} $"1Unu&P
} ~Mbo`:>(4v
} =)5O(h
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ((&_m9a
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类写好了,下面是在JSP中如下调用。 rCU f,)
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<% GjN/8>/
CountBean cb=new CountBean(); R_ymTB}<t(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ^
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CountCache.add(cb); 7ZarXv
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out.print(CountCache.list.size()+"<br>"); 4scY8(1
CountControl c=new CountControl(); MkgeECMf
c.run(); mz$)80ly
out.print(CountCache.list.size()+"<br>"); /\34o{
%>