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: "e?#c<p7
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CountBean.java KuAGy*:4T
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/* o`]FH_
* CountData.java I(eR3d:
* Xrs~ove1V
* Created on 2007年1月1日, 下午4:44 _25]>D$
* Hqy>!1!
* To change this template, choose Tools | Options and locate the template under W5yu`Br
* the Source Creation and Management node. Right-click the template and choose oieLh"$
* Open. You can then make changes to the template in the Source Editor. 'r3}= z4Y
*/ D%}o26K.C
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package com.tot.count; w'j]Y%
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/** F}mwQ%M
* @)Y7GM+^
* @author k0=y_7
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*/ aj~@r3E;
public class CountBean { U*l>8
private String countType; U/lra&P
int countId; B_1u<00kg
/** Creates a new instance of CountData */ nmAXU!t'
public CountBean() {} Ft>8 YYyU
public void setCountType(String countTypes){ T7X2$ '
this.countType=countTypes; D-EM
} /R?uxhV
public void setCountId(int countIds){ *m/u 3.\
this.countId=countIds; cSWVHr
} 2,`mNjHh
public String getCountType(){ 6!m#_z8qG3
return countType; cMKh+r
} mjc:0hH
public int getCountId(){ 7guxkN#
return countId; `&DiM@Sm
} 7t/SZm
} Jx7^|A
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CountCache.java KL{uhb0f
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/* )8PL7P84
* CountCache.java _3JTHf<+
* 6n g9 o6
* Created on 2007年1月1日, 下午5:01 $RO=r90o
* 6f1Y:qK'@
* To change this template, choose Tools | Options and locate the template under I>|?B(F
* the Source Creation and Management node. Right-click the template and choose XS@6jbLE
* Open. You can then make changes to the template in the Source Editor. G(e?]{(
*/ (CwaOm{g
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package com.tot.count; ~Y[b
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import java.util.*; J>&GP#7}
/** ;B@l0)7(x
* B 8,{jwB
* @author v-@@>?W-
*/ CdjGYS
public class CountCache { cQb%bmBc5
public static LinkedList list=new LinkedList(); b?,y%D)'
/** Creates a new instance of CountCache */ vN+!l3O
public CountCache() {} J(GLPC O$K
public static void add(CountBean cb){ YTA&G
if(cb!=null){ 5}VP-04vh
list.add(cb); oyY,uB.|
} [sRQd;+
} $Vh82Id^
} L"0L_G
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CountControl.java /PlsF
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/* (w fZ!
* CountThread.java ~b/>TKn+
* d)HK9T|B
* Created on 2007年1月1日, 下午4:57 ,GlK_-6>
* =nl,5^
* To change this template, choose Tools | Options and locate the template under N:.bnF(
* the Source Creation and Management node. Right-click the template and choose _BV:i:z
* Open. You can then make changes to the template in the Source Editor. d29HEu
*/ Q)/q h;Ru
QO%K`}Q}
package com.tot.count; >F
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import tot.db.DBUtils; E'}$'n?:
import java.sql.*; bC|~N0b
/** ~%ZO8X:^
* uVocl,?.L
* @author D.~t#a A
*/ kaLRI|hC
public class CountControl{ Y|L57F
private static long lastExecuteTime=0;//上次更新时间 YDwns
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 i`X{pEKP+
/** Creates a new instance of CountThread */ YL+W4ld
public CountControl() {} AKVmUS;70
public synchronized void executeUpdate(){ <|@9]>z
Connection conn=null; o/xE
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PreparedStatement ps=null; 53c6dl
try{ Fei$94a
conn = DBUtils.getConnection(); xnTky1zq
conn.setAutoCommit(false); l`k3!EZDS
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); >4c 1VEi
for(int i=0;i<CountCache.list.size();i++){ h?b{{
CountBean cb=(CountBean)CountCache.list.getFirst(); ,3K?=e2
CountCache.list.removeFirst(); u|C9[(
ps.setInt(1, cb.getCountId()); 7%tn+
ps.executeUpdate();⑴ K(?7E6\vO
//ps.addBatch();⑵ =J,:j[D(
} F=#Wfl-o
//int [] counts = ps.executeBatch();⑶ oUqNA|l
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conn.commit(); $FoNEr&q
}catch(Exception e){ KK?}`o
e.printStackTrace(); n~h%K7
c
} finally{ )`)cB)s
try{ .*Z]0~ &|
if(ps!=null) { @RC_Ie=#)
ps.clearParameters(); `fH6E8N
ps.close(); zK&`&("4C
ps=null; V\_
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} #KIHq2:.4
}catch(SQLException e){} `7LdF,OdE
DBUtils.closeConnection(conn); |G1U$p
} pJmn;XbME
} /1Eg6hf9B
public long getLast(){ #pZ3xa3R
return lastExecuteTime; {MHr]A}X\
} J-U}iU|
public void run(){ ~[C m#c
long now = System.currentTimeMillis(); 0wx`y$~R
if ((now - lastExecuteTime) > executeSep) { \oi=fu=}*
//System.out.print("lastExecuteTime:"+lastExecuteTime); =hA/;
//System.out.print(" now:"+now+"\n"); `
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); )XD_Yq@E
lastExecuteTime=now; Co'dZd(
executeUpdate(); TPrwC~\B/
} ]!/1qF
else{ # RtrHm
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 51~:t[N|
} q|~9%Pujg
} /h_BF\VBs
} "G<^@v9
//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 +=||c\'
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类写好了,下面是在JSP中如下调用。 |')Z;
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<% )msqt!Ev
CountBean cb=new CountBean(); C&Rv)j
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); "2 Kh2[K
CountCache.add(cb); J<'4(}^|
out.print(CountCache.list.size()+"<br>"); j}y"
CountControl c=new CountControl(); WKN\*N <
c.run(); SW bwD/SN
out.print(CountCache.list.size()+"<br>"); -Z @cj
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