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: 'aWZ#GS*
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CountBean.java u1Yp5jp^K
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/* cCCplL
* CountData.java eBKIdR%k
* FDC{8e
* Created on 2007年1月1日, 下午4:44 W5uI(rS<6
* 0PbIWy'
* To change this template, choose Tools | Options and locate the template under {j@)sDMX
* the Source Creation and Management node. Right-click the template and choose muq|^Hfb
* Open. You can then make changes to the template in the Source Editor. pU'sADC
*/ *\vc_NP]
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package com.tot.count; \Y 4Z Q"0Q
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/** rq?x]`u
* F}[;ytmUS
* @author c'qM$KN9G
*/ /RmCMT
public class CountBean { B+sqEj-
private String countType; qnRzs
int countId; .e+UgCwi
/** Creates a new instance of CountData */ WcG&W>
public CountBean() {} N^N?!I
public void setCountType(String countTypes){ 3dphS ^X
this.countType=countTypes; @>j \~<%
} #|i{#~gxM
public void setCountId(int countIds){ uK5Px!
this.countId=countIds; `:4cb$
} *p!dd?8
public String getCountType(){ ufPQ~,.
return countType; 4Pdk?vHK;
} ?O?~|nI
public int getCountId(){ #"JU39e
return countId; {r8CzJ'f
} ]f~YeOB@
} <`q o*__1
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CountCache.java o7seGw<$X
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/* PBv43uIL
* CountCache.java VA.1JBQ
* $)~]4n=
* Created on 2007年1月1日, 下午5:01 L]}|{<3\
* G9q0E|
* To change this template, choose Tools | Options and locate the template under 8<
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* the Source Creation and Management node. Right-click the template and choose K gX)fj
* Open. You can then make changes to the template in the Source Editor. e8.bH#
*/ q4N$.hpb
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package com.tot.count; kv b-=
import java.util.*; 0k 8SDRWU
/** 7d5x4^EYE
* /K<Nlxcm
* @author B=Os?'2[
*/ 0]~n8mB>
public class CountCache { .Ps;O
public static LinkedList list=new LinkedList(); ^D|c
/** Creates a new instance of CountCache */ Yw<:I&
public CountCache() {} zL'n
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public static void add(CountBean cb){ k5YDqGn'q
if(cb!=null){ A9gl|II
list.add(cb); 91XHz14
} /<Et
} jGCW^#GE
} oH0\6:S
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CountControl.java d6VKUAk'7>
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/* ijB,Q>TgO
* CountThread.java @:I/lg=Qd
* M{QNpoM
* Created on 2007年1月1日, 下午4:57 HPQ ,tlp6j
* ngjbE+
* To change this template, choose Tools | Options and locate the template under Q~kwUZ
* the Source Creation and Management node. Right-click the template and choose u4'Lm+&O
* Open. You can then make changes to the template in the Source Editor. .YkKIei
*/ >Z%^|S9
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package com.tot.count; /[L:ol6;!
import tot.db.DBUtils; .8m)^ET
import java.sql.*; dEiX!k$#
/** {65X37W
* "=;&{N~8U
* @author AUK7a
*/ N_0O"" d
public class CountControl{ GZw<Y+/V"5
private static long lastExecuteTime=0;//上次更新时间 wkGF&U
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 t-Wn@a
/** Creates a new instance of CountThread */ = DgD&_
public CountControl() {} ;ORy&H aKl
public synchronized void executeUpdate(){ &}uO ]0bR
Connection conn=null; pK`rm"6G
PreparedStatement ps=null; itU01
try{ iR-O6*PTC
conn = DBUtils.getConnection(); QWkw$mcf
conn.setAutoCommit(false); k<qQ+\X
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); gyK"#-/_d
for(int i=0;i<CountCache.list.size();i++){ i/L1KiCLx
CountBean cb=(CountBean)CountCache.list.getFirst(); u@HP@>V
CountCache.list.removeFirst(); <5q }j-Q
ps.setInt(1, cb.getCountId()); d~8Q)"6 [
ps.executeUpdate();⑴ lVdExR>H
//ps.addBatch();⑵ jc<3\ 7
} [Dhc9
//int [] counts = ps.executeBatch();⑶ _W+TZa@_
conn.commit(); MouYZI)
}catch(Exception e){
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e.printStackTrace(); 'K1w.hC<
} finally{ =aCv
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try{ aE"t['
if(ps!=null) { ziOmmL(r
ps.clearParameters(); p,+~dn;=
ps.close(); T2dpn%I
ps=null; Qi%A/~
} z 4-wvn<*
}catch(SQLException e){} %lPP1
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DBUtils.closeConnection(conn); DM&"oa50
} ZBGI_9wZ
} oAL-v428
public long getLast(){ X DX_c@U
return lastExecuteTime; TCEbz8ql
} ;@L#0
public void run(){ ObCwWj^qO
long now = System.currentTimeMillis(); %>.v[d1c
if ((now - lastExecuteTime) > executeSep) { bQ)r8[o!
//System.out.print("lastExecuteTime:"+lastExecuteTime); "@n$(-.
//System.out.print(" now:"+now+"\n"); Dt ?Fs
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); bchhokH
lastExecuteTime=now; Di6:r3sEO
executeUpdate(); iY2bRXA
} Nl+2m4
else{ 1/m/Iw@
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); P(4[<'HO
} O ?4V($
} Q,$x6YwE
} ?`r/_EKNv
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 fq(e~Aqw$
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类写好了,下面是在JSP中如下调用。 uO6_lOT9n
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<% ";~#epPkX
CountBean cb=new CountBean(); T:ck/:ZH
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); CUG6|qu
CountCache.add(cb); g41LpplX
out.print(CountCache.list.size()+"<br>"); | @YN\g K;
CountControl c=new CountControl(); ZoUfQ!2*
c.run(); 5E@V@kw
out.print(CountCache.list.size()+"<br>"); jsR1jou6
%>