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: GtGyY0
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CountBean.java ]2u7?l
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/* !E(J
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* CountData.java ]"7El;2z
* =r@ie>*U
* Created on 2007年1月1日, 下午4:44 6.(]}?g1f
* a'L7y%
* To change this template, choose Tools | Options and locate the template under ' ]H#0.
* the Source Creation and Management node. Right-click the template and choose Qcy+ {j]
* Open. You can then make changes to the template in the Source Editor. ;_;H(%uY
*/ NEjBjLJZ
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package com.tot.count; 0[3tW[j
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/** ~>wq;T:=
* '! 2
* @author 'j=PbA
*/ 4'u|L&ow
public class CountBean { .x9nWa
private String countType; |7 W6I$Xl
int countId; r>D[5B
/** Creates a new instance of CountData */ ]mDsUZf<
public CountBean() {} #|2g{7g*
public void setCountType(String countTypes){ qoyGs}/I8
this.countType=countTypes; g^|_X1{
} SJY"]7
public void setCountId(int countIds){ T<_1|eH
this.countId=countIds; d#$i/&gE
} FCw
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public String getCountType(){ 2* cKFv{
return countType; FnU{C= P
} I "+|cFq.
public int getCountId(){
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return countId; ,L;c{[*rh
} N'W>pU
} Ij,?G*
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CountCache.java r+WPQ`Ar
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/* <\#
* CountCache.java ^SelqX
* ?R~Ye
* Created on 2007年1月1日, 下午5:01 yW7S
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* Y)-)NLLG;n
* To change this template, choose Tools | Options and locate the template under P+h<{%:*
* the Source Creation and Management node. Right-click the template and choose l2_E6U"
* Open. You can then make changes to the template in the Source Editor. fn"jYSy
*/ ^[,1+WS%
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package com.tot.count; 1=cfk#
import java.util.*; Zm'::+tl
/** wBaFC\CW
* d3q/mg 5a
* @author 4pHPf<6
*/ k?*DBXJv
public class CountCache { g960;waz3
public static LinkedList list=new LinkedList(); ri_6wbPp
/** Creates a new instance of CountCache */ `oI/;&
public CountCache() {} ~+NFWNgN
public static void add(CountBean cb){ X2mm'JDwK
if(cb!=null){ .J!
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list.add(cb); Q $,kB<M
} )#TJw@dNf^
} ?&bVe__
} EYj2h
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CountControl.java Yka yT0!
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/* InGbV+ I
* CountThread.java lbXkZ ,
* qSs^}eN
* Created on 2007年1月1日, 下午4:57 rcb/X`l=
* }u$aPS<$!
* To change this template, choose Tools | Options and locate the template under [[Eu?vQ9R
* the Source Creation and Management node. Right-click the template and choose +c2=*IA/
* Open. You can then make changes to the template in the Source Editor. UyfIAC$S
*/ ~\(>m=|C:H
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package com.tot.count; IpVwn Nj!}
import tot.db.DBUtils; W}i$f -K
import java.sql.*; MrjB[3Td
/** %^BOYvPx
* WX$^[^=HC
* @author 544I#!
*/ (N>ew)Ke
public class CountControl{ CX2q7azG
private static long lastExecuteTime=0;//上次更新时间 a[9OtZX<
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 uS10P7N}
/** Creates a new instance of CountThread */ 9>Z#o<*_/
public CountControl() {} iPL'JVPZ
public synchronized void executeUpdate(){ K%#C+`Ij
Connection conn=null; &wC.?w$
PreparedStatement ps=null; %LaC$w_X
try{ !6`nN1A
conn = DBUtils.getConnection(); a5+v)F/=
conn.setAutoCommit(false); ?26[%%
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3cQmxp2*
for(int i=0;i<CountCache.list.size();i++){ EJ|ZZYke!
CountBean cb=(CountBean)CountCache.list.getFirst(); tQ<2K*3]
CountCache.list.removeFirst(); Ji?UG@
ps.setInt(1, cb.getCountId()); H[yLlv
ps.executeUpdate();⑴ Sgk{NM7|k
//ps.addBatch();⑵ 8*){*'bf
} CUM~*
//int [] counts = ps.executeBatch();⑶ DY27' `n6
conn.commit(); uy%PTi+A
}catch(Exception e){ -5B([jHgR
e.printStackTrace(); F4l6PGxF&\
} finally{ QU;C*}0Zl
try{ yKy)fn!
if(ps!=null) { {.)~4.LhQM
ps.clearParameters(); 545xs`Q_
ps.close(); ~}l,H:jk@
ps=null; G#M]\)f%
} VL1z$<vVXt
}catch(SQLException e){} LOo#
DBUtils.closeConnection(conn); WY UU-
} s8O+&^(U
} x1ex}_\
public long getLast(){ ,;& PKY
return lastExecuteTime; l3$?eGGM
} p;01a
public void run(){ O/"&?)[v
long now = System.currentTimeMillis(); 7im;b15j`'
if ((now - lastExecuteTime) > executeSep) { "qp_*Y
//System.out.print("lastExecuteTime:"+lastExecuteTime); U9OF0=g
//System.out.print(" now:"+now+"\n"); (G;*B<|A
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); R-|]GqS}L
lastExecuteTime=now; d$
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executeUpdate(); )y Y;%
} bhT]zsBK
else{ 2UJ0%k
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); : \`MrI^
} id9T[^h
} I[Y?f8gJ
} ~Q]M_,`M
//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 tq93 2M4
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类写好了,下面是在JSP中如下调用。 #&gy@!a~
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<% X;g|-<
CountBean cb=new CountBean(); [K QZHIe
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); S-dV
CountCache.add(cb); &"0[7zgYQz
out.print(CountCache.list.size()+"<br>"); )Jn80~U|1
CountControl c=new CountControl(); Q)8t;Kx
c.run(); 7 4UE-H)
out.print(CountCache.list.size()+"<br>"); XcneH jpR
%>