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: ']}ZI 8
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CountBean.java T-|z18|!
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/* u^iK?S#Ci8
* CountData.java BS+N
* Y}nE/bmx&9
* Created on 2007年1月1日, 下午4:44 eCk}B$ 2
* NsWyxcty
* To change this template, choose Tools | Options and locate the template under iSIj ?.
* the Source Creation and Management node. Right-click the template and choose g%RL9-z
* Open. You can then make changes to the template in the Source Editor. e-{k;V7b
*/
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package com.tot.count; E(TL+o
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/** sl/# 1B
* p jHUlQ
* @author U.?,vw'aai
*/ 7M^!t X
public class CountBean { =AZ>2P
private String countType; 9{xP~0g
int countId; ;'R{b$B;|
/** Creates a new instance of CountData */ u]"oGJj1
public CountBean() {} JsVW:8QO~
public void setCountType(String countTypes){ PN0:,.4
this.countType=countTypes; A9$q;8= <
} qBKIl=
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public void setCountId(int countIds){ ETjlq]@j
this.countId=countIds; 0P%(4t$pd
} 9<\wa/#
public String getCountType(){ >KM<P[BRd
return countType; In^$+l%O[
} H$;K(,'
public int getCountId(){ O1rnF3Be
return countId; X`^9a5<"
} XP6R$0yN
} ).-B@&Eu%
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CountCache.java !*+~R2&b
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/* SvDVxK
* CountCache.java GG%j+Ed
* H%Q@DW8~@
* Created on 2007年1月1日, 下午5:01 EV2whs2g
* *9?-JBT&F
* To change this template, choose Tools | Options and locate the template under ~~:i+-[
* the Source Creation and Management node. Right-click the template and choose y\r8_rBo
* Open. You can then make changes to the template in the Source Editor. jIAl7aoY
*/ ZqS'xN:k
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package com.tot.count; 2-]gHAw%
import java.util.*; 8cR4@Hqx
/** 0=L:8&m
* l"b78n
* @author Mq6.!j
*/ .CrahV1G
public class CountCache { }_gCWz-5?
public static LinkedList list=new LinkedList(); a|TP 2m
/** Creates a new instance of CountCache */ A&F@+X6@
public CountCache() {} 3V LwMF?
public static void add(CountBean cb){ I)Lg=n$
if(cb!=null){ 9[6xo!
list.add(cb); i&{8a3B
} *sZOws<
} Ok2k;
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} mcp}F|ws
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CountControl.java Hz%#&E
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/* 1th|n
* CountThread.java aL+k1v[m
* cz&Qoyh{;
* Created on 2007年1月1日, 下午4:57 X: @nROL^7
* 'S E%9
* To change this template, choose Tools | Options and locate the template under 1ciP+->$
* the Source Creation and Management node. Right-click the template and choose SDDs}mV
* Open. You can then make changes to the template in the Source Editor. 8WfF: R;
*/ 5pE[}@-c9
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package com.tot.count; 7PHvsd"]p
import tot.db.DBUtils; ~*THL0]~
import java.sql.*; ,?<jue/bd
/** OUnt?[U\
* B5zu?AG
* @author li%=<?%T
*/ ^e<0-uM"s
public class CountControl{ HQ ^> ~
private static long lastExecuteTime=0;//上次更新时间 &6r".\;^
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 mNWmp_c,1
/** Creates a new instance of CountThread */ p,$1%/m
public CountControl() {} {cq; SH
public synchronized void executeUpdate(){ :$dGcX}
Connection conn=null; E3_EXz9h
PreparedStatement ps=null; j?[fpN$
try{ tiI>iP`!
conn = DBUtils.getConnection(); DJ[U^dWRn
conn.setAutoCommit(false); }bAd@a9>3
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); vC&y:XMt,`
for(int i=0;i<CountCache.list.size();i++){ nPR_:_^
CountBean cb=(CountBean)CountCache.list.getFirst(); <P(d%XEl
CountCache.list.removeFirst(); QYyF6ht=!
ps.setInt(1, cb.getCountId()); 6wIv7@Y
ps.executeUpdate();⑴ kHm1aE<
//ps.addBatch();⑵ dkLc"$(O
} 9%>H}7=
//int [] counts = ps.executeBatch();⑶ &}YB!6k h^
conn.commit(); 6./h0kD`
}catch(Exception e){ ShF
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e.printStackTrace(); bx!Sy0PUJ
} finally{ ZRsDn
try{ @X\Sh>H
if(ps!=null) { ('OPW&fRG
ps.clearParameters(); LN" bGe
ps.close(); ?dC[VYC\^
ps=null; oT5?*3f
} aq0J }4U
}catch(SQLException e){} )}]<o
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DBUtils.closeConnection(conn); AL&}WbUC
} c{V0]A9VF
} +\\*Iy'xK
public long getLast(){ Apa)qRJd
return lastExecuteTime; :hjeltt
} ;)u}`4~L
public void run(){ UVxE~801Y
long now = System.currentTimeMillis(); mQ('X~l
if ((now - lastExecuteTime) > executeSep) { EYcvD^!1g
//System.out.print("lastExecuteTime:"+lastExecuteTime); yQM7QLbTk
//System.out.print(" now:"+now+"\n"); 8 y/YX
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); toX4kmC
lastExecuteTime=now; l/DV
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executeUpdate(); s7D_fv4e
} 0F0V JE
else{ -Z4J?b
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); I8
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} `jvIcu5c
} q !EJs:AS
} D2[uex
//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 )wCA8
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类写好了,下面是在JSP中如下调用。 @HMt}zD
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<% `a3q)}*Y
CountBean cb=new CountBean(); 3k5Mty
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); bxqXFy/I
CountCache.add(cb); F2AM/m^!q
out.print(CountCache.list.size()+"<br>"); <E&1HeP
CountControl c=new CountControl(); Iwize,J~X
c.run(); 9K Ih}Q@P
out.print(CountCache.list.size()+"<br>"); pvDr&n9
%>