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: Nl<,rD+KSD
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CountBean.java IS
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/* f<sPh>n
* CountData.java d<'Yt|zt
* @gjdyz
* Created on 2007年1月1日, 下午4:44 @bCiaBdi
* 0#/
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* To change this template, choose Tools | Options and locate the template under tMBy
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* the Source Creation and Management node. Right-click the template and choose *^+xcG
* Open. You can then make changes to the template in the Source Editor. [5eT|uy
*/ bl>b/u7/6
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package com.tot.count; R|$`MX}'z
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/** jsaCnm>&
* ;,-Vapz
* @author BI^]juH-c
*/ Uu:v4a
public class CountBean { jL%}y1m?
private String countType; 5_C#_=E
int countId; 5t#]lg[06'
/** Creates a new instance of CountData */ jh&vq=PH
public CountBean() {}
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public void setCountType(String countTypes){ &FF. Ddt{
this.countType=countTypes; OwIy(ukTI
} N~J Eia%
public void setCountId(int countIds){ 6:tr8 X_
this.countId=countIds; ~[y+B0I3
} de47O
public String getCountType(){ Hf{%N'4
return countType; Od]xIk+E
} \` ^Tbn:
public int getCountId(){ T|2%b*/
return countId; 5t?2B]
} sLqvDH?V
} X@q1;J
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CountCache.java k[) @I;m
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/* V(uRKu
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* CountCache.java Z2jb>%
* `80Hxp@
* Created on 2007年1月1日, 下午5:01 5@%-=87S
* 5m?$\h
* To change this template, choose Tools | Options and locate the template under j:KQIwc
* the Source Creation and Management node. Right-click the template and choose }/0dfes
* Open. You can then make changes to the template in the Source Editor. +M&S
*/ Y mjS!H
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package com.tot.count; ~Fb?h%w
import java.util.*; swL|Ff`$
/** 2B dr#qr
* xF|*N<9(</
* @author .LR>&N _U
*/ Z?'|9FM
public class CountCache { ea>\.D-S
public static LinkedList list=new LinkedList(); 1W<_5 j_
/** Creates a new instance of CountCache */ T@Z{KV"S
public CountCache() {}
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public static void add(CountBean cb){ -Ep6.v
if(cb!=null){ {~I_rlo n
list.add(cb); }3y\cv0ct
} 8mLU ~P
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} 4PM`hc
} `3oP^#
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CountControl.java mJR
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/* }?kO<)d
* CountThread.java q:sR zX
* R_n-&d'PP
* Created on 2007年1月1日, 下午4:57 [V0 h9!
* Nb/%>3O@
* To change this template, choose Tools | Options and locate the template under fEv36xb2S
* the Source Creation and Management node. Right-click the template and choose 17MjIX
* Open. You can then make changes to the template in the Source Editor. Qo *]l_UO;
*/ as!j 0j%
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package com.tot.count; Lta\AN!c
import tot.db.DBUtils; ye2Oh7
import java.sql.*; S\!E;p
/** z1s"C[W2T
* D +""o"%
* @author jloyJ@ck
*/ Ib2pV2`h(
public class CountControl{ |R/50axI
private static long lastExecuteTime=0;//上次更新时间 (SA*9%
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 L]<4{8H.
/** Creates a new instance of CountThread */ TJ:Lz]l >
public CountControl() {} UdJV;T'rm
public synchronized void executeUpdate(){ |h/2'zd^-
Connection conn=null; :q1r2&ne
PreparedStatement ps=null; $7d"9s\$"
try{ TLgVuY
conn = DBUtils.getConnection(); p
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conn.setAutoCommit(false); R,1 ,4XT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 6|}mTG^
for(int i=0;i<CountCache.list.size();i++){ b.;}Hq>
CountBean cb=(CountBean)CountCache.list.getFirst(); ]!:Y]VYN)\
CountCache.list.removeFirst(); rtE,SN
ps.setInt(1, cb.getCountId()); x)L@xQ
ps.executeUpdate();⑴ IyP].g1"U
//ps.addBatch();⑵ >K%x44|
} =T$- #bA)
//int [] counts = ps.executeBatch();⑶ 5wX>PJS
conn.commit(); `,d7_#9'
}catch(Exception e){ ayp}TYh*
e.printStackTrace(); q/?_djv
} finally{ Q2?qvNZ
try{ Q#KjX;No
if(ps!=null) { 4/>={4Y9
ps.clearParameters(); ow[qpP[
ps.close(); nVzo=+Yp
ps=null; UI;{3Bn
} L ai"D[N
}catch(SQLException e){} Shz;)0To
DBUtils.closeConnection(conn); m@~x*+Iz
} IhLfuyFWu
} 0aWb s$FyU
public long getLast(){ C<>.*wlp=
return lastExecuteTime; `f]O
} CI{x/ e^(
public void run(){ %A3Jd4DH
long now = System.currentTimeMillis(); 9#!tzDOtD
if ((now - lastExecuteTime) > executeSep) { nT"z(\i.!J
//System.out.print("lastExecuteTime:"+lastExecuteTime); 8F1!9W7
//System.out.print(" now:"+now+"\n"); e_TDO
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }}_l@5
lastExecuteTime=now; y{JkY\g
executeUpdate(); F}>`3//u
} BYU.ptiJJ
else{ [_n|n"M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); G2D<LRWt4
} $ cSZX#\
} DAW%?(\,
} K>y+3HN[6
//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 G\%hT5^
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类写好了,下面是在JSP中如下调用。 \.]
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<% J?'!8,RX
CountBean cb=new CountBean(); X)m2{@v D
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \ua.%|
CountCache.add(cb); g\'sGt3 O
out.print(CountCache.list.size()+"<br>"); 2|BE{91
CountControl c=new CountControl(); F1>,^qyG6
c.run(); ^ a:F*<D
out.print(CountCache.list.size()+"<br>"); kx[8#+P
%>