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: 7u\^$25+h
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CountBean.java InNuK0@
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/* K!HSQ,AC
* CountData.java z9&$Xao
* tQz-tQg
* Created on 2007年1月1日, 下午4:44 Sxjwqqv
* (Pc:A!}
* To change this template, choose Tools | Options and locate the template under }#'O b
* the Source Creation and Management node. Right-click the template and choose O)`R)MQ)
* Open. You can then make changes to the template in the Source Editor. mm\J]Cc`
*/ l5D8DvJCj
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package com.tot.count; 8_8R$=V
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/** sh:sPzQ%Jv
* 5sFp+_``
* @author m}Kn!21
*/ kVy%y"/
public class CountBean { vDv:3qN7(
private String countType; +<|6y46
int countId; HeNg<5v%Y
/** Creates a new instance of CountData */ b)3dZ*cOJ
public CountBean() {} ,>`wz^z
public void setCountType(String countTypes){ { >bw:^F
this.countType=countTypes; ~H7m7
} 3iR;(l}
public void setCountId(int countIds){ oh :g
this.countId=countIds; yWsNG;>
} k^S=i_ U
public String getCountType(){ ujmO'blO
return countType; ,N?~je.
} k)1K6ug
public int getCountId(){ 3!,XR\`[
return countId; [- a2<E
} y5RcJM
} +I;b,p
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CountCache.java >ys>Q)
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/* co|jUDu>W
* CountCache.java '_@Y
* ,<d[5;7x
* Created on 2007年1月1日, 下午5:01 i"r&CS)sT
* XWf8ZZj
* To change this template, choose Tools | Options and locate the template under bT|a]b:
* the Source Creation and Management node. Right-click the template and choose (es+VI2!&C
* Open. You can then make changes to the template in the Source Editor. R/Mwq#xUb
*/ nws '%MK)
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package com.tot.count; Tu?+pz`h
import java.util.*; qb]n{b2
/** {W)Kz_
* D}>pl8ke~g
* @author N&]v\MjI62
*/ [V|,O'X ~
public class CountCache { \3-XXq
public static LinkedList list=new LinkedList(); w-C~
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/** Creates a new instance of CountCache */ #5wOgOv
public CountCache() {} o8-BTq8
public static void add(CountBean cb){ =;W"Pi;*
if(cb!=null){ [2pp)wq
list.add(cb); O#7ONQfBO
} L'BDS*
} ug'I:#@2
} >XcbNZV
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CountControl.java `MAee8u'
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/* y>Zvos e
* CountThread.java I?YTX
* K_{f6c<
* Created on 2007年1月1日, 下午4:57 \_Nr7sc\
* -wH#B<'
* To change this template, choose Tools | Options and locate the template under kT&-:: ^R
* the Source Creation and Management node. Right-click the template and choose orVsMT[A
* Open. You can then make changes to the template in the Source Editor. ([R}s/)$
*/ Q&]
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package com.tot.count; 7!+kyA\}r^
import tot.db.DBUtils; X,:pT\G
import java.sql.*; rlT[tOVAY
/** h!5^d!2,
* Fq!12/Nn
* @author >ygyPl
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*/ 4:q<<vCJv
public class CountControl{ d)1)/Emyj
private static long lastExecuteTime=0;//上次更新时间 {_0Efc=7
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 blNE$X+0|
/** Creates a new instance of CountThread */ t
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public CountControl() {} R $HIJM
public synchronized void executeUpdate(){ EAn}8#r'(8
Connection conn=null; }YW0?-G.$
PreparedStatement ps=null; /+l3
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try{ )X@Obg
conn = DBUtils.getConnection(); hLPg=8nJ_
conn.setAutoCommit(false); L]hXAShmb
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 79U
Th@r}
for(int i=0;i<CountCache.list.size();i++){ b#bdz1@s
CountBean cb=(CountBean)CountCache.list.getFirst(); YLmzMD>
CountCache.list.removeFirst(); R$'4 d
ps.setInt(1, cb.getCountId()); #t:]a<3Y2
ps.executeUpdate();⑴ Ja>UcE29
//ps.addBatch();⑵ #/$}zl
} W6ZXb_X
//int [] counts = ps.executeBatch();⑶ AVVL]9b_2
conn.commit(); 4r;!b;3
}catch(Exception e){ ^wPKqu)^
e.printStackTrace(); 3t22KY[`
} finally{ oJe9H <
try{
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if(ps!=null) { [/hS5TG|7
ps.clearParameters(); K-IXAdx
ps.close(); mt3j- Mw
ps=null; n)uvN
} K&0op 4&
}catch(SQLException e){} Eb SH)aR
DBUtils.closeConnection(conn); j89|hG)2
} s|Ls
} ?Y+xuY/t
public long getLast(){ biG=4?Xl
return lastExecuteTime; \bYuAE1q
} Kdh(vNB>
public void run(){ 5QB]2c^
long now = System.currentTimeMillis(); v39`ct= e
if ((now - lastExecuteTime) > executeSep) { t1?e$s
//System.out.print("lastExecuteTime:"+lastExecuteTime); r?Jxl<
//System.out.print(" now:"+now+"\n"); c[E{9wp v
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;ZXP*M9
lastExecuteTime=now; Epj
executeUpdate(); (oX|lPD<b
} ";}Lf1M9
else{ I"Y d6M%
;
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); }uo5rB5D
} )tR5JK} AV
} o6sL~*hQ
} ?g%5 d
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 *k==2figz
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类写好了,下面是在JSP中如下调用。 geU-T\1[l
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<% W)JUMW2|
CountBean cb=new CountBean(); _H}y7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); B 3|zR
CountCache.add(cb); 'EU{%\qM
out.print(CountCache.list.size()+"<br>"); kv&%$cA
CountControl c=new CountControl(); ^@ s!"c
c.run(); -cs
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out.print(CountCache.list.size()+"<br>"); =Xze ).g
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