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: ?<!|
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CountBean.java #a#F,ZT
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/* 7CysfBF0g
* CountData.java -7ep{p-
* sJZiI}Xc
* Created on 2007年1月1日, 下午4:44 G|Ti4_w
* 9up3[F$
* To change this template, choose Tools | Options and locate the template under YK_7ip.a[
* the Source Creation and Management node. Right-click the template and choose Rcuz(yS8
* Open. You can then make changes to the template in the Source Editor. 1MFbQs^
*/ 00(\ZUj
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package com.tot.count; 6ujWNf
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/** Yy8g(bU
* 4W75T2q#
* @author 2?C)&
*/ 97Vtn4N3
public class CountBean { /vt3>d%B;
private String countType; F ,kZU$
int countId; F59 TZI
/** Creates a new instance of CountData */ &=[WIG+rk
public CountBean() {} Qs!5<)6
public void setCountType(String countTypes){ &]Tmxh(
this.countType=countTypes; l1I#QB@5n
} WJi]t9 3
public void setCountId(int countIds){ "+c-pO`Wg
this.countId=countIds; 4g/dP^
} [),ige
public String getCountType(){ C!gZN9-
return countType; F|8&
} Py<}S-:
public int getCountId(){ gGYKEq{j(
return countId; +`4A$#$+y
} [E_9V%^
} lE;!TQj:X
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CountCache.java @ Qe0! (_=
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/* rv;3~'V
* CountCache.java :RYTL'hes
* x`s>*^
* Created on 2007年1月1日, 下午5:01 , gHDx
* _1^'(5f$
* To change this template, choose Tools | Options and locate the template under crCJrN=
* the Source Creation and Management node. Right-click the template and choose YSMAd-Ef-
* Open. You can then make changes to the template in the Source Editor. [[ZJ]^n,
*/ )7@0[>
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package com.tot.count; lZ0 =;I
import java.util.*; *p d@.|^)m
/** 9WHddDA
* gw(z1L5
n
* @author [
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*/
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public class CountCache { b>k y
public static LinkedList list=new LinkedList(); M|-)GvR$J
/** Creates a new instance of CountCache */ N`i/mP
public CountCache() {} `oJ [u:b
public static void add(CountBean cb){ 2%1hdA<
if(cb!=null){ pAEx#ck
list.add(cb); :k"]5>(^
} *hrd5na
} +\'tE~V
} sLFl!jX
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CountControl.java X&zis1A<
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/* #$vEGY}1
* CountThread.java ,Q B<7a+I
* G3]4A&h9v~
* Created on 2007年1月1日, 下午4:57 E7hhew
* rNM;ZPF#
* To change this template, choose Tools | Options and locate the template under ?%86/N>
* the Source Creation and Management node. Right-click the template and choose w!CNRtM:~
* Open. You can then make changes to the template in the Source Editor. 6zkaOA46V
*/ B!yr!DWv
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package com.tot.count; e!`i3KYn"
import tot.db.DBUtils; !k%#R4*>
import java.sql.*; <{pz<io)
/** t)
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* @x1-!
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* @author PH"%kCI:
*/ +p^u^a
public class CountControl{ _@g;8CA
private static long lastExecuteTime=0;//上次更新时间 YqG7h,F
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]4{H+rw
/** Creates a new instance of CountThread */ -M2yw
public CountControl() {} +(*DT9s+
public synchronized void executeUpdate(){ iE{&*.q_}>
Connection conn=null; {*KEP
PreparedStatement ps=null; ?upM>69{
try{ H]!"Zq k
conn = DBUtils.getConnection(); >p/`;Kq@
conn.setAutoCommit(false); A
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); +"(jjxJm
for(int i=0;i<CountCache.list.size();i++){ !BI;C(,RL
CountBean cb=(CountBean)CountCache.list.getFirst(); #g=XUZ/"
CountCache.list.removeFirst(); V]N?6\Op
ps.setInt(1, cb.getCountId()); |o@%dH
ps.executeUpdate();⑴ *VeRVaBl
//ps.addBatch();⑵ 5;S.H#YOpO
} bcR_E5x$
//int [] counts = ps.executeBatch();⑶ zQA`/&=Y
conn.commit(); H"KCK6
}catch(Exception e){ OB7hlW
e.printStackTrace(); r>\bW)e
} finally{ }Lv;!
try{ 2tLJU Z1
if(ps!=null) { n(Uyz`qE
ps.clearParameters(); :4s1CC+@\
ps.close(); _U0f=m
ps=null; 1}37Q&2
} >+waX"e
}catch(SQLException e){}
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DBUtils.closeConnection(conn); q;U,s)Uz^
} 9kojLqCT
} 7KPwQ?SjT
public long getLast(){ GL JMP^p
return lastExecuteTime; &{RDM~
} G
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public void run(){ ;]fs'LH
long now = System.currentTimeMillis(); C7vxw-o|&p
if ((now - lastExecuteTime) > executeSep) { !c-*O<Y
//System.out.print("lastExecuteTime:"+lastExecuteTime); fV:83|eQ
//System.out.print(" now:"+now+"\n"); .o8t+X'G
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); @6d[=!9
lastExecuteTime=now;
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executeUpdate(); IAEAhqp
} nie% eC&U
else{ 2(nlJ7R
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); :!/8Hv
} bfO=;S]b!
} `kr?j:g
} XM}hUJJW
//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 Q^I\cAIB
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类写好了,下面是在JSP中如下调用。 .KC++\{HE
@H<q"-J
<% U3kyraj
CountBean cb=new CountBean(); 7rPF$ \#
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8] ikygt"
CountCache.add(cb); J=L5=G7(
out.print(CountCache.list.size()+"<br>"); ?}7p"3j'z
CountControl c=new CountControl(); H:G1BZjq
c.run(); ;wVwX6:ZKr
out.print(CountCache.list.size()+"<br>"); T Ge_G_'o
%>