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: Qjx?ri//
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CountBean.java zX5!vaEv
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/* u4z&!MT}
* CountData.java w6`9fX6{h
* Vz14j_
* Created on 2007年1月1日, 下午4:44 T5urZq*R
* gVeEdo`$<
* To change this template, choose Tools | Options and locate the template under y"]n:M:(
* the Source Creation and Management node. Right-click the template and choose ~HQ9i%exg
* Open. You can then make changes to the template in the Source Editor. f}guv~K
*/ r&-m=Kk$
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package com.tot.count; f%5zBYCgC
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/** hF2IW{=!
* e1//4H::t
* @author Q{e\}wN
*/ ]weoTn:
public class CountBean { ^Rm
private String countType; kw2T>
int countId; .^J2.>.
/** Creates a new instance of CountData */ G0E121`h
public CountBean() {} h|X^dQb]
public void setCountType(String countTypes){ EpQ8a[<-3
this.countType=countTypes; O25lLNmO
} cqxVAzb
public void setCountId(int countIds){ :6$>_m=i
this.countId=countIds; BT}&Y6
} <$JaWL
public String getCountType(){ S6fb f>[
return countType; I}R0q
} K_&4D'
public int getCountId(){ O*#*%RL|
return countId; 4j)tfhwd8
} \l~*PG2
} \6\<~UX^
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CountCache.java bJs9X/E
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/* }f2r!7:x
* CountCache.java !>:?rSg*
* Y".RPiTL
* Created on 2007年1月1日, 下午5:01
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* ~g.$|^,.O/
* To change this template, choose Tools | Options and locate the template under B5$kHM%p
* the Source Creation and Management node. Right-click the template and choose }l=xiAF
* Open. You can then make changes to the template in the Source Editor. zP<pEI
*/ OrK&RC
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package com.tot.count; %iw3oh&Fkm
import java.util.*; iQ"XLrpl
/** )vxUT{;sH
* Dih3}X&jn$
* @author [+P#tIL
*/ h yv2SxP*
public class CountCache { %; D.vKoh
public static LinkedList list=new LinkedList(); Q%f|~Kl-hd
/** Creates a new instance of CountCache */ TiH)5
public CountCache() {}
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public static void add(CountBean cb){ F
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if(cb!=null){ L>RP-x>
list.add(cb); ~15N7=wCM
} AGYc |;
} O2%?
} b7p@Dn?E
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CountControl.java W|g4z7Pb
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/* ^8AXxE
* CountThread.java y3o25}"
* -RvQB
* Created on 2007年1月1日, 下午4:57 ;k>&FWEG
* 5E zw
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* To change this template, choose Tools | Options and locate the template under vbC\?\_
* the Source Creation and Management node. Right-click the template and choose GfmI<{da
* Open. You can then make changes to the template in the Source Editor. /*X2c6<d
*/ R&BTA
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package com.tot.count; 9E"vN
import tot.db.DBUtils; Wg<(ms dj
import java.sql.*; ~ijVmWNk
/** \(^nSy&N
* P>NF.BCq
* @author ;E3>ay6m8
*/ |w<H!lGe!$
public class CountControl{ <4g{ fT0
private static long lastExecuteTime=0;//上次更新时间 F|e1"PkeoA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Z:sg}
/** Creates a new instance of CountThread */ fj;y}t1E]
public CountControl() {} HiR[(5vnf
public synchronized void executeUpdate(){ JSCZ{vJ$
Connection conn=null; zGAq-<
PreparedStatement ps=null; +~mA}psr
try{ "2)H'<
conn = DBUtils.getConnection(); @oV9)
conn.setAutoCommit(false); S/e2P|}
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); mUdOX7$c>
for(int i=0;i<CountCache.list.size();i++){ lFV N07hG
CountBean cb=(CountBean)CountCache.list.getFirst(); /tf5Bv'<
CountCache.list.removeFirst(); [f1
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ps.setInt(1, cb.getCountId()); o:3dfO%nuM
ps.executeUpdate();⑴ XkXHGDEf 1
//ps.addBatch();⑵ B"TAjB&
*
} ,^w?6?,&l}
//int [] counts = ps.executeBatch();⑶ XBb~\p3y
conn.commit(); ,y
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}catch(Exception e){ VcSVu
e.printStackTrace(); X.f>'0i
} finally{ s'E2P[:
try{ smRE!f*q
if(ps!=null) { 2(u,SQ
ps.clearParameters(); \eT5flC
ps.close(); jv%kOovj
ps=null; |
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} S+atn]eU@
}catch(SQLException e){} #Ssx!+q?
DBUtils.closeConnection(conn); t<z`N-5*
} ||hb~%JK6
} Y2ZT.l
public long getLast(){ LcSX *MC
return lastExecuteTime; %,6#2X nX%
} h]5C|M|
public void run(){ aJ-K? xQ
long now = System.currentTimeMillis(); 5Iy;oZ
if ((now - lastExecuteTime) > executeSep) { /%}*Xh
//System.out.print("lastExecuteTime:"+lastExecuteTime); ^S UPi
//System.out.print(" now:"+now+"\n"); }z _
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); E*V`":efS
lastExecuteTime=now; % NA9{<I
executeUpdate(); E:JJ3X|
} juka0/
else{ 6y+Kjd/D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F)&@P-9+
} EQb7-vhg
} ysxb?6
} DcoX+8 7
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 Q[vJqkgT
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类写好了,下面是在JSP中如下调用。 [F0s!,P
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<% -(bXSBs#
CountBean cb=new CountBean(); s \;" X
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Co (.:z~
CountCache.add(cb); {QHVo#
out.print(CountCache.list.size()+"<br>"); 01r 8$+
CountControl c=new CountControl(); +$C4\$t
c.run(); b$ve sJ
out.print(CountCache.list.size()+"<br>"); ,&jhlZ i
%>