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: 1 niTkop
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CountBean.java A84HaRlkF5
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/* {q4"x5|
* CountData.java &zy9} 4w,
* l.)!jWY
* Created on 2007年1月1日, 下午4:44 AVZ@?aJgF
* "MN'%"/
* To change this template, choose Tools | Options and locate the template under >,2],X"G
* the Source Creation and Management node. Right-click the template and choose m"}G-#
* Open. You can then make changes to the template in the Source Editor. C5
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*/ R>q'Y mu~
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package com.tot.count; l<6/ADuS
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/** %s yBm
* |Ay#0uQ5Y
* @author }y/t~f+
*/ Pl6=._
public class CountBean { ]x\wP7x
private String countType; d(XWt;K K
int countId; 1OL~)X3
/** Creates a new instance of CountData */ VG^-aR_F
public CountBean() {} S22 ;g
public void setCountType(String countTypes){ uI wyan-
this.countType=countTypes; lEs/_f3;A
} \_'pUp22
public void setCountId(int countIds){ 9-SXu lgu
this.countId=countIds; &YMj\KmlSg
} (*]Y<ve
public String getCountType(){ hn.fX:}
return countType; mqw.v$>
} ~3 (>_r
public int getCountId(){ ha5\T'
return countId; _,Y79 b6
} bc NYoZ8`
} P&;I]2#
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CountCache.java 35T7g65;
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/* us+adS.l&
* CountCache.java X}Fv*
* Y$^QH.h
* Created on 2007年1月1日, 下午5:01 q?\D9aT9
* \266N;JrN
* To change this template, choose Tools | Options and locate the template under #>'0C6Xn
* the Source Creation and Management node. Right-click the template and choose j!dklQh0
* Open. You can then make changes to the template in the Source Editor. \ZH=$c*W
*/ ,sK-gw
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package com.tot.count; J)]W[Nk
import java.util.*; @<L.#gtP
/** ?K"]XXsI
* tA.C"
* @author R,lr&;a8
*/ ^D)C|T
public class CountCache { %94"e7Hy
public static LinkedList list=new LinkedList(); [<t*&Kr+o
/** Creates a new instance of CountCache */ '%N
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public CountCache() {} N1rrKyL!$
public static void add(CountBean cb){ %LyB~X
if(cb!=null){ V
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list.add(cb); [<hiOB
} iatQHn>(
} JI(|sAH
} dXhV]xK
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CountControl.java KAZz)7
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/* Kt(p|
* CountThread.java q$P"o].EK
* paY%pU
* Created on 2007年1月1日, 下午4:57 @z.!Dby
* -}s?!Pg>
* To change this template, choose Tools | Options and locate the template under JYq} YG=%
* the Source Creation and Management node. Right-click the template and choose s0CRrMk
* Open. You can then make changes to the template in the Source Editor. #<{MtK_
*/ p[Es4S}N
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package com.tot.count; "$_ypgRrSR
import tot.db.DBUtils; _+i-)
import java.sql.*; l_WY];a
/** jBM>Pe^`3
* tq[C"| dH
* @author #@G2n@Hj
*/ = j -
public class CountControl{ "q8wEu,z[
private static long lastExecuteTime=0;//上次更新时间 [}D)73h`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 eYFCf;
/** Creates a new instance of CountThread */ %?seX+ne
public CountControl() {} N~Gh>{N
public synchronized void executeUpdate(){ :L,]<n
Connection conn=null; We|*s2!
PreparedStatement ps=null;
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try{ +t f=
conn = DBUtils.getConnection(); Vufw:}i+^
conn.setAutoCommit(false); @gd-lcMYW
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 4'M#m|V
for(int i=0;i<CountCache.list.size();i++){ f!<mI8H
CountBean cb=(CountBean)CountCache.list.getFirst(); Kmtr.]Nj
CountCache.list.removeFirst(); ts
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ps.setInt(1, cb.getCountId()); n~LR=o
ps.executeUpdate();⑴ W!g
,
//ps.addBatch();⑵ !**q20-aP
} Ua4} dW[w
//int [] counts = ps.executeBatch();⑶ 1D$k:|pP~
conn.commit(); rqIt}(J
}catch(Exception e){ 9iUw7-)
e.printStackTrace(); Uvp?HZ\Z
} finally{ Q]\xO/
try{ 'EQAG' YV
if(ps!=null) { =vWnqF:
ps.clearParameters(); G} p~VLf
ps.close(); C/XOI>
ps=null; Pdv&X*KA
} <NUZPX29
}catch(SQLException e){} cWi2Sls
DBUtils.closeConnection(conn); 5g=" #
} ],LOkAX
} >v(Xc/oI
public long getLast(){ ^0 t`EZ$
return lastExecuteTime; |laqy`D
} FUQT ,7CA
public void run(){ @[^H*^1|g
long now = System.currentTimeMillis(); *oF{ R^
if ((now - lastExecuteTime) > executeSep) { V1+IqOXAIp
//System.out.print("lastExecuteTime:"+lastExecuteTime); =LC5o2bLy
//System.out.print(" now:"+now+"\n"); *ULXJZ%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (mzyA%;W
lastExecuteTime=now; ~DSle 3
executeUpdate();
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} @{bf]Oc
else{ ,yC~{H
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F>&8b^v bn
} wL{Qni3A
} BjShK+Y
} )_BteLo-
//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 + 7Z%N9
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类写好了,下面是在JSP中如下调用。 S+He
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<% 3TJNlS
CountBean cb=new CountBean(); Zy<0'k%U
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); F$caKWzny5
CountCache.add(cb); __a9}m4i7x
out.print(CountCache.list.size()+"<br>"); zUOYH4+
CountControl c=new CountControl(); , v R4x:W
c.run(); @+xQj.jNC
out.print(CountCache.list.size()+"<br>"); H;v*/~zl
%>