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: IIQ3|eZ
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CountBean.java mK40 f
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/* 90iW-"l+[
* CountData.java 'Z2N{65
* {0vbC/?]
* Created on 2007年1月1日, 下午4:44 d =(Yl r
* (
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* To change this template, choose Tools | Options and locate the template under ;Nf hKu%K
* the Source Creation and Management node. Right-click the template and choose y'!p>/%v
* Open. You can then make changes to the template in the Source Editor. _RaVnMJKX4
*/ df4^C->:
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package com.tot.count; &lh_-@Xz
b6!Q!:GO&
/** -{8Q= N
* :qCm71*
* @author c+b:K
*/ =*:[(Py1
public class CountBean { 1s}``1>
private String countType; NkA6Cp[Q,1
int countId; Tt <-<oyU.
/** Creates a new instance of CountData */ Z|:_c
public CountBean() {} GATP
public void setCountType(String countTypes){ 8?j&{G
this.countType=countTypes; lYZ@a4TA
} /R(U>pZ
public void setCountId(int countIds){ U)`3[fo
this.countId=countIds; R5NRCI
} yToT7 X7F7
public String getCountType(){ RRI>bh]
return countType; (ciGLfNG
} _yxe2[TD
public int getCountId(){ Ql#W
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return countId; ^;)SFmjg%
} kKxL04
} $dx1[V+_
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CountCache.java c<+g|@A#
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/* 2[8fFo>
* CountCache.java EbBv}9g
* x;ERRK
* Created on 2007年1月1日, 下午5:01 }"&n[/8~
* X|-v0 f
* To change this template, choose Tools | Options and locate the template under {hvQ<7b
* the Source Creation and Management node. Right-click the template and choose c6?c>*z
* Open. You can then make changes to the template in the Source Editor. d739UhKC
*/ CzzUi]*Ac{
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package com.tot.count; Eo7 _v
import java.util.*; 45r]wT(C
/** @H3 s2|
* ,yHzo
* @author :>tF_6
*/ 1kvPiV=X>
public class CountCache { 5bF9IH
public static LinkedList list=new LinkedList(); 4hsPbUx9
/** Creates a new instance of CountCache */ AQnJxIL:
public CountCache() {} R
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public static void add(CountBean cb){ 3D?IG\3
if(cb!=null){ fB;&n
list.add(cb); B&%L`v2[
} 0%h[0jGj
} ;uM34^
} 27Kc-rcB
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CountControl.java dl*_ m3T
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/* 2cs?("8e%
* CountThread.java 4cXAT9
* [Vrc:%Jk
* Created on 2007年1月1日, 下午4:57 8Ehy9<
* 9_J!s
* To change this template, choose Tools | Options and locate the template under l]a^"4L4`o
* the Source Creation and Management node. Right-click the template and choose 5}-)vsa`
* Open. You can then make changes to the template in the Source Editor. i#L6UKe:Q
*/ #6*V7@9]3|
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package com.tot.count; m+D2hK*
import tot.db.DBUtils; 5z9r S<
import java.sql.*; !XgQJ7y_Z
/** -{yDk$"
* "?oo\op
* @author _/8_,9H
*/ x\Nhix}1D
public class CountControl{ ax-=n (
private static long lastExecuteTime=0;//上次更新时间 &q," !:L]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0=N4O!X9
/** Creates a new instance of CountThread */ kbfuvJ>
public CountControl() {} ucQezmie
public synchronized void executeUpdate(){ lSZ"y
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Connection conn=null; <ldid]o
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PreparedStatement ps=null; ,3w I~j=
try{ ox(*
conn = DBUtils.getConnection(); Nbgp_:{
conn.setAutoCommit(false); Q9`s_4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Am2*-
for(int i=0;i<CountCache.list.size();i++){ &FL%H;Kfx
CountBean cb=(CountBean)CountCache.list.getFirst(); .LX?VD
CountCache.list.removeFirst(); `y1BTe&
ps.setInt(1, cb.getCountId()); !&@2
ps.executeUpdate();⑴ 1k!D0f3qb
//ps.addBatch();⑵ GYFgEg}
} -6uH.
//int [] counts = ps.executeBatch();⑶ PLO\L W
conn.commit(); ! a86iHU
}catch(Exception e){ II.<S C
e.printStackTrace(); YH6snC$u
} finally{ 11i"nR|
try{ +ckMT3
if(ps!=null) { ~wfoK7T}
ps.clearParameters(); ?+3R^%`V
ps.close(); 6o$Z0mG
ps=null; \V._Z>]
} b OW}"
}catch(SQLException e){} 0Wa#lkn$I
DBUtils.closeConnection(conn); ri_P;#lz
} 8r5xs-
} _Mlhumt
public long getLast(){ RI?NB6U
return lastExecuteTime; 1UC2zM"
} }'u3U"9)
public void run(){ 1oB$MQoc
long now = System.currentTimeMillis(); 0 9tikj1
if ((now - lastExecuteTime) > executeSep) { 0rV/qMo;K
//System.out.print("lastExecuteTime:"+lastExecuteTime); ,xYg
//System.out.print(" now:"+now+"\n"); ,Yo: &>As
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); B<A:_'g
lastExecuteTime=now; >Ja0hS{*
executeUpdate(); 3 Q@9S
} AlUJ1^o)
else{ H1Q''$}Z.
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); r~I.F!{
} QDP-E[
} #U\$@4D
} :g&>D#{
//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 =1O?jrl~q
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类写好了,下面是在JSP中如下调用。 }Bd_:#.mw
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<% *<w3" iq
CountBean cb=new CountBean(); ~'(9?81d
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); dZF8R
CountCache.add(cb); R;%^j=Q
out.print(CountCache.list.size()+"<br>"); S=4R5igrC
CountControl c=new CountControl(); miPmpu!
c.run(); !TGr .R
out.print(CountCache.list.size()+"<br>"); wI*Y{J
%>