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: =:Ahg
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CountBean.java o."k7fLB
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/* w/&)mm{
* CountData.java dNK Q&TC
* $R6iG\V5
* Created on 2007年1月1日, 下午4:44 o}O"
* oe$&X&
* To change this template, choose Tools | Options and locate the template under ?tx%KU\3
* the Source Creation and Management node. Right-click the template and choose >U.
* Open. You can then make changes to the template in the Source Editor. Ad$CHx-
*/ rKxIOJ ,T
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package com.tot.count; nE;^xMOK!
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/** HGIPz{/5U
* DO6Tz-%o
* @author !D#wSeJ
*/ q=Xd a0c
public class CountBean { 742sqHx
private String countType; a_}k^zw(
int countId; =)QtE|p,77
/** Creates a new instance of CountData */ {<$ D|<S
public CountBean() {} %8C,9q
public void setCountType(String countTypes){ d^b(Uo=$
this.countType=countTypes; z 3((L
} d+DdDr
public void setCountId(int countIds){ CWKN0HB
this.countId=countIds; Zfwhg4G~
} vfBIQfH
public String getCountType(){ v_=xN^R
return countType; }#'I,?_k
} ^jY/w>UdH
public int getCountId(){ FVY$A=G
return countId; w(/#isC
} CVxqNR*DN
} -QPM$
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CountCache.java gbf2ty
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/* Z/
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* CountCache.java CcDmZ
* 'OEh'\d+x
* Created on 2007年1月1日, 下午5:01 "^gV.
* hv.33l
* To change this template, choose Tools | Options and locate the template under $+'bRUo
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. ayGYVYi
*/ GTYCNi66
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package com.tot.count; R k'5L
import java.util.*; F6'[8f
/** WxE^S ??|
* VKGH+j[
* @author v<:/u(i
*/ vC%Hc/&.}
public class CountCache { 2@>#?c7
public static LinkedList list=new LinkedList(); LB/1To
/** Creates a new instance of CountCache */ 8],tGMu
public CountCache() {} q{2
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public static void add(CountBean cb){ qt=nN-AC(
if(cb!=null){ Co^GsUJ
list.add(cb); 0I7 r{T
} cL^r^kL("
} Tu7}*vsR
} .q5WK#^
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CountControl.java fYiof]v@_m
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/* Rd,5&X$
* CountThread.java ^+u/Lw&
* UhbGU G
* Created on 2007年1月1日, 下午4:57 1JY3c
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* n}3fItSJ
* To change this template, choose Tools | Options and locate the template under y1t,i.
[
* the Source Creation and Management node. Right-click the template and choose bq"dKN`
* Open. You can then make changes to the template in the Source Editor. >slGicZ0
*/ IP+.L]S
*DuP~8
package com.tot.count; (3QG
import tot.db.DBUtils; HC>MCwx=r
import java.sql.*; P$Fq62;}r4
/** DlxL:
* Ybp';8V
* @author 66l+cb
*/ &b=OT%D~FU
public class CountControl{ Z>_F:1x
private static long lastExecuteTime=0;//上次更新时间 M&5De{LS}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 {8w,{p`
/** Creates a new instance of CountThread */ qU+qY2S:
public CountControl() {} vxl!`$Pi
public synchronized void executeUpdate(){ C~c|};&%
Connection conn=null; 2<TpNGXM_
PreparedStatement ps=null; Xr]<v%,C
try{ nrJW.F]S8[
conn = DBUtils.getConnection(); r(p@{L185
conn.setAutoCommit(false); 0<u(!iL
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); _&K>fy3t&
for(int i=0;i<CountCache.list.size();i++){ _g%h:G&^
CountBean cb=(CountBean)CountCache.list.getFirst(); *5q_fO
CountCache.list.removeFirst(); DNGj8 1'c
ps.setInt(1, cb.getCountId()); ITf4PxF
ps.executeUpdate();⑴ "q3W&@
//ps.addBatch();⑵ /5j]laYK)
} cOb,Md
//int [] counts = ps.executeBatch();⑶ VZCCMh-
conn.commit(); l]F)]>AE
}catch(Exception e){ %Z{ 7*jtE
e.printStackTrace(); gbjql+Mx+
} finally{ hg+0!DVx
try{ P>qDQ1
if(ps!=null) { `l}+BI`4
ps.clearParameters(); <iNxtD0
ps.close(); *7^w}v+.
ps=null; z0xw0M+X
} 0%;y'd**Ck
}catch(SQLException e){} i~uoK7o|G
DBUtils.closeConnection(conn); qTrb)95
} m!^z{S
} TRku(w1f
public long getLast(){ <XH,kI(%
return lastExecuteTime; on)$y&lu
} w/Y6m.i1
public void run(){ 0)E`6s#M
long now = System.currentTimeMillis(); "Is0:au+?}
if ((now - lastExecuteTime) > executeSep) { #uCE0}N@
//System.out.print("lastExecuteTime:"+lastExecuteTime); #6F/:j;
//System.out.print(" now:"+now+"\n"); 4=7h1qex
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 5<mGG;F
lastExecuteTime=now; z-`-0@/A$
executeUpdate(); GCv*a[8?n
} EbMG9
else{ Erq%Ck(
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); *;Gn od<
} d <Rv~F@
} GOj<>h}r
} YZQF*fj
//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 ]hjA,p@Q
RinaGeim
类写好了,下面是在JSP中如下调用。 q
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<% (sL!nRw
CountBean cb=new CountBean(); #*x8)6Ct
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); jZP~!q
CountCache.add(cb); CK#SD|~:
out.print(CountCache.list.size()+"<br>"); lt{yo\
CountControl c=new CountControl(); e2vLUlL8
c.run(); @V71%D8{
out.print(CountCache.list.size()+"<br>"); #/2W RN1L
%>