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: >{QO$F#
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CountBean.java YGC%j
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/* %59uR}\
* CountData.java 4w~%MZA^
* {aN pk,n
* Created on 2007年1月1日, 下午4:44 zBlv?JwG
* ^~I@]5Pq
* To change this template, choose Tools | Options and locate the template under 5wmd[YL
* the Source Creation and Management node. Right-click the template and choose Bcarx<P-p
* Open. You can then make changes to the template in the Source Editor. t"Ci1"U
*/ [nZIV
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package com.tot.count; (5 @H
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/** SF&2a(~s
* \7i_2|w
* @author 5LB{b]w7m
*/ # H
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public class CountBean { 9M;t4Um
private String countType; @`dg:P*[
int countId; k`Ifl)
/** Creates a new instance of CountData */ ,bXZ<RY$
public CountBean() {} 'Zp{
public void setCountType(String countTypes){ y0sce
this.countType=countTypes; oR&z,%0wMK
} <|4$TH^t
public void setCountId(int countIds){ s6@mXO:H^
this.countId=countIds; ^\AeX-q2v'
} 7n6g;8xE
public String getCountType(){ itP`{[
return countType;
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} a3<:F2=~\
public int getCountId(){ +ZM,E8
return countId; 3}<U'%sd
} 4lB??`UN
} UMR ?q0J
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CountCache.java /T)E&=Ds
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/* ^"X.aksA
* CountCache.java \~ChbPnc
* iCF},W+
* Created on 2007年1月1日, 下午5:01 T:$^1"\
* h9)fXW
* To change this template, choose Tools | Options and locate the template under iyl
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* the Source Creation and Management node. Right-click the template and choose R~4X?@ZB
* Open. You can then make changes to the template in the Source Editor. 3NtUB;!
*/ HCs^?s8Pp
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package com.tot.count; t\K
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import java.util.*; b<00 %Z
/** 4u6 FvN
* ::oFL#+
* @author s2{SbOBis
*/ i=aR~
public class CountCache { 0I)$!1~O)
public static LinkedList list=new LinkedList(); <bKtAf
/** Creates a new instance of CountCache */ F'Y ad
public CountCache() {} cjEqN8
public static void add(CountBean cb){ sQa;l]O:NC
if(cb!=null){ WFOJg&
list.add(cb); ;>v.(0FE6
} P35DVK S
} 2'Dl$DH
} `FMo;,j
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CountControl.java v_!6S|
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/* ,x8;| o5
* CountThread.java b#
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* il5C9ql$
* Created on 2007年1月1日, 下午4:57 ]nhh|q9r{
* ,-#MEr
* To change this template, choose Tools | Options and locate the template under <?nI O
* the Source Creation and Management node. Right-click the template and choose :5NMgR.d
* Open. You can then make changes to the template in the Source Editor. S/'0czDMW
*/ U>E:
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package com.tot.count; =X4Fn^w"4O
import tot.db.DBUtils; 9(N
import java.sql.*; fjRVYOG#
/** ?G,4N<]Nu
* _uQ]I^ 'D
* @author q-JTGCFl
*/ &kg^g%%
public class CountControl{ $D^\[^S
private static long lastExecuteTime=0;//上次更新时间 ENTcTrTn
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 4XN
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/** Creates a new instance of CountThread */ c{=Sy;i@
public CountControl() {} F^yW3|Sb
public synchronized void executeUpdate(){ =_dM@ j
Connection conn=null; .k,j64
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PreparedStatement ps=null; C}8#yAS9M
try{ 4[gmA
conn = DBUtils.getConnection(); $Ll9ak}
conn.setAutoCommit(false); cc[(w
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); b>07t!;
for(int i=0;i<CountCache.list.size();i++){ <Vhd4c
CountBean cb=(CountBean)CountCache.list.getFirst(); {"ST
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CountCache.list.removeFirst(); 6@N,'a8r
ps.setInt(1, cb.getCountId()); Fz7t84g(
ps.executeUpdate();⑴ ,;g%/6X
//ps.addBatch();⑵ ],]Rv#`
} cJ4My#w
//int [] counts = ps.executeBatch();⑶ o:d7IL
conn.commit(); cbJgeif
}catch(Exception e){ PIri|ZS
e.printStackTrace(); UQl?_[G
} finally{ Q0xO;20
try{ kKyU?/aj
if(ps!=null) { 4=yzf
ps.clearParameters(); ,!:c6F+
ps.close(); YdhTjvx
ps=null; 51k}LH
} 4Q|>k)H
}catch(SQLException e){} .(@=L1C<}J
DBUtils.closeConnection(conn); ,->ihxf
} =6sP`:
} CD`a-]6qA
public long getLast(){ j
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return lastExecuteTime; !l'nX
} Px_8lB/;
public void run(){ ^z
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long now = System.currentTimeMillis(); y3oq{Z>
if ((now - lastExecuteTime) > executeSep) { :\;9y3
//System.out.print("lastExecuteTime:"+lastExecuteTime); "hyfo,r
//System.out.print(" now:"+now+"\n"); AwJg/VBo)
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 6r~9$IM
lastExecuteTime=now; B7\4^6Tx
executeUpdate(); v`S5[{6
} ('z=/"(l
else{ $[T~<I
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |O8e;v72g^
} ufL,Kq4
} KMhrw s{&B
} wkt4vE87
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 +Y?Tr i
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类写好了,下面是在JSP中如下调用。 fk}Raej g
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<% Sm/8VSY
CountBean cb=new CountBean(); SzLlJUV X
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); <$nPGz)}
CountCache.add(cb); K'&,]r#
out.print(CountCache.list.size()+"<br>"); ?O25k!7
CountControl c=new CountControl(); 11PL1zzH
c.run(); dX?j/M-
out.print(CountCache.list.size()+"<br>"); 5 H._Q
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