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: :doP66["!
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CountBean.java 8~EDmg[
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/* >6=yxCJ
* CountData.java ov#/v\|0
* Yj/S(4(h?
* Created on 2007年1月1日, 下午4:44 M=x/PrY"R
* k:Uyez
* To change this template, choose Tools | Options and locate the template under 0DIaXdOdW+
* the Source Creation and Management node. Right-click the template and choose !?Z}b.%W
* Open. You can then make changes to the template in the Source Editor. I&YYw8&
*/ UALwr>+VJ
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package com.tot.count; "\vEi
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/** g>_6O[;t%
* 0LrTYrlj
* @author `U#*O+S-^
*/ ^uMy|d
public class CountBean { Q68&CO(rE
private String countType; -G(z!ed
int countId; 9&g//JlD
/** Creates a new instance of CountData */ >9Fs)R]P
public CountBean() {} &tj0Z:
public void setCountType(String countTypes){ }7IS:"tu
this.countType=countTypes; 7cK#fh"hvg
} I6M 7xn
public void setCountId(int countIds){ @8HTC|_vX
this.countId=countIds; ?>1AT==wI
} KR^lmN
public String getCountType(){ NC>rZS]
return countType; ^IjKT
} Zi|MWaA.f
public int getCountId(){ ,LSF@1|Fx
return countId; hW~,Uqy
} Z WL/ AC
} `a["`N^
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CountCache.java YKJk)%;+w
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/* ~Hd{+0
* CountCache.java ^W eE%"
* TKx.`Cf
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* Created on 2007年1月1日, 下午5:01 %ErLL@e
* "6['!rq0
* To change this template, choose Tools | Options and locate the template under 0F8y8s
* the Source Creation and Management node. Right-click the template and choose 05gU~6AF
* Open. You can then make changes to the template in the Source Editor. KqP!={>"
*/ RgHPYf{
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package com.tot.count; MBIt)d@Ix
import java.util.*; Ett%Y*D+J
/** /+1+6MqRn*
* EFW'D=&h8
* @author k:Da+w_'1
*/ 5n"b$hMF
public class CountCache { &{!FE`ZC_
public static LinkedList list=new LinkedList(); jX-v9eaA
/** Creates a new instance of CountCache */ [M 65T@v
public CountCache() {} b/:9^&z
public static void add(CountBean cb){ ?[hIv6c
if(cb!=null){ Ck%nNy29
list.add(cb); SQDllG84E
} f>k]{W Y
} y))d[1E
} s$4!?b$tw
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CountControl.java c~3OK_k
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/* _Jx.?8
* CountThread.java X=USQj\A
* a6wPkf7-H
* Created on 2007年1月1日, 下午4:57 =3$JeNK9
* =e=sK'NvD
* To change this template, choose Tools | Options and locate the template under WPs6)8
* the Source Creation and Management node. Right-click the template and choose Azvj(j
* Open. You can then make changes to the template in the Source Editor. es 8%JTi
*/ Eyv%"+>
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package com.tot.count; %ZF47P%6
import tot.db.DBUtils; Jte:U*2
import java.sql.*; 4/vQ/>c2j
/** JnQ5r>!>3
* N9QHX
* @author |re)]%A?Fu
*/ .xo#rt9_"=
public class CountControl{ 1vk&;
private static long lastExecuteTime=0;//上次更新时间 }G}2Y (
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 j;6kN-jx
/** Creates a new instance of CountThread */ 5V5Nx(31i
public CountControl() {} C ioM!D
public synchronized void executeUpdate(){ D]X&Va
Connection conn=null; %ub\+~
PreparedStatement ps=null; 3pg_`
try{ KnK8\p88\
conn = DBUtils.getConnection(); M9so3L<N0
conn.setAutoCommit(false); Af y\:&j
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); a^/j&9
for(int i=0;i<CountCache.list.size();i++){ {[&$W8Li
CountBean cb=(CountBean)CountCache.list.getFirst(); |:)UNb?R"O
CountCache.list.removeFirst(); ukNB#2"
ps.setInt(1, cb.getCountId()); (#,0\ea{x
ps.executeUpdate();⑴ ip.aM#
//ps.addBatch();⑵ ,xmL[Yk,
} bDK%vx!_
//int [] counts = ps.executeBatch();⑶ Q|T9tc->
conn.commit(); $;~
}catch(Exception e){ 93I.Wp_{
e.printStackTrace(); vu7F>{D
} finally{ U&x)Q
try{ O$SQzLZx&
if(ps!=null) { o m9zb&{tu
ps.clearParameters(); SA3!a.*c
ps.close(); 3hUU$|^4gm
ps=null; \ct7~!qM
} W[ZW=c
}catch(SQLException e){} s,~)5nL
DBUtils.closeConnection(conn); 8<#S:O4kA
} )GgO=J:o
} ~#
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public long getLast(){ %N.qu_,IZ
return lastExecuteTime; &v}c3wL]
} N5]}m:"pk
public void run(){ C{gY*+
long now = System.currentTimeMillis(); $<c;xDO&t
if ((now - lastExecuteTime) > executeSep) { \9FWH}|
//System.out.print("lastExecuteTime:"+lastExecuteTime); P/9iB/
//System.out.print(" now:"+now+"\n"); Ic!8$NhRS
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); y&F0IJ|`@M
lastExecuteTime=now; @ckOLtxE>
executeUpdate(); U`25bb1Wj
}
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else{ |~V`Es +j
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); R\VM6>SN'S
} ICbT{Mla
} /C: rr_4=
} iD/r8_}
//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 ;8VvpO^G/
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类写好了,下面是在JSP中如下调用。 (txr%Z0E
%\uEV
<% F|ib=_)3
CountBean cb=new CountBean(); "?[7oI}c&
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); *CnrzrKtQ
CountCache.add(cb); i*q!|^M
out.print(CountCache.list.size()+"<br>"); slV7,4S&!
CountControl c=new CountControl();
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c.run(); GiF})e}
out.print(CountCache.list.size()+"<br>"); G\HU%J
%>