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: QsKnaRT
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CountBean.java jQ7;-9/~N
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/* ;=@O.iF;H
* CountData.java 19[o XyFI
* SN")u
* Created on 2007年1月1日, 下午4:44 .nEMd/pX
* ?#<'w(^%#
* To change this template, choose Tools | Options and locate the template under WU=EJY}#n
* the Source Creation and Management node. Right-click the template and choose #]^C(qmb:
* Open. You can then make changes to the template in the Source Editor. -4Dz98du
*/ wbr$w>n
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package com.tot.count;
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/** ?z|Bf@TJ[+
* `K@N\VM
* @author ,>qtnwvlHP
*/ M`Wk@t6>
public class CountBean { r/':^Ex
private String countType; v1+.-hO
int countId; JXww_e[
/** Creates a new instance of CountData */ )@U~Li/+
public CountBean() {} EJz!#f~
public void setCountType(String countTypes){ _7u&.l<;
this.countType=countTypes; R$IsP,Uw
} U7/
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public void setCountId(int countIds){ /EQ^-4yr
this.countId=countIds; D|$0~1y
} OcpvY~"Pr
public String getCountType(){ |;aZi?Ek[
return countType; 6^jrv [d
} XmwR^
public int getCountId(){ `'r~3kP*NT
return countId; #~m^RoE
} B
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} h7.jWJTo
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CountCache.java >(YH@Z&;
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/* xrY >Or
* CountCache.java ettBque
* U+ Yu_=o{
* Created on 2007年1月1日, 下午5:01 W:WRG8(F
* #/9Y}2G|]
* To change this template, choose Tools | Options and locate the template under :.BjJ2[S
* the Source Creation and Management node. Right-click the template and choose &.yX41R
* Open. You can then make changes to the template in the Source Editor. d6m&nj
*/ {#@[ttw$U
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package com.tot.count; mo4F\$2N
import java.util.*; *\iXU//^)
/** f2KH&j>~r
* X?u=R)uG
* @author ,0nrSJED
*/ R;U4a2~
public class CountCache { @3b @]l5
public static LinkedList list=new LinkedList(); y fuH
/** Creates a new instance of CountCache */ 0[uOKFgE
public CountCache() {} y'oH>l+n
public static void add(CountBean cb){ 0&kmP '
if(cb!=null){ [z_ztK1
list.add(cb); DtS7)/<T
} 9 ,tk
} /UR;,ts
} *[jq&
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CountControl.java !iX/Ni:
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/* Mbly-l{|
* CountThread.java sQrM"i0Y>
* Y@Ry
oJ
* Created on 2007年1月1日, 下午4:57 oj?y_0}:^
* >G [:Q
s
* To change this template, choose Tools | Options and locate the template under h y\iot
* the Source Creation and Management node. Right-click the template and choose L&|^y8
* Open. You can then make changes to the template in the Source Editor. BOdlz#&s
*/ Sq2 8=1%
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package com.tot.count; ]}&HvrOld
import tot.db.DBUtils; pma=*
import java.sql.*; AS4oz:B
/** (v0Q.Q@<
* 9*!*n ~
* @author uXA}" f2
*/ `oO*ORq&
public class CountControl{ B1Z;
private static long lastExecuteTime=0;//上次更新时间 OSJj^Y)W|
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 z 7cA5'c
/** Creates a new instance of CountThread */ Lo)T
public CountControl() {} v[DxWs8q
public synchronized void executeUpdate(){ d7Cs a
c
Connection conn=null; UQb|J9HY4
PreparedStatement ps=null; J'&K
try{ I34
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conn = DBUtils.getConnection(); Z#kB+.U
conn.setAutoCommit(false); }1a(*s,s-^
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); F+D
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for(int i=0;i<CountCache.list.size();i++){ m.5@qmQ
CountBean cb=(CountBean)CountCache.list.getFirst(); ?2gXF0+~Y2
CountCache.list.removeFirst(); /p}pdXS
ps.setInt(1, cb.getCountId()); R_:lp\S&
ps.executeUpdate();⑴ x97L>>|
//ps.addBatch();⑵ ,a0RI<D
} 0@
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//int [] counts = ps.executeBatch();⑶ gEgd/Le
conn.commit(); Hr}\-$
}catch(Exception e){ U4iVI#f
e.printStackTrace(); dD
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} finally{ AJoP3Zv|?
try{ g`6I, 6G
if(ps!=null) { oy=ej+:
ps.clearParameters(); AZ\f6r{
ps.close(); W6u(+P]("
ps=null; UnZc9 6
} & TN.6Hm3
}catch(SQLException e){} --vJR/-
DBUtils.closeConnection(conn); iQiXwEAi[
} {s2eOL5I|%
} \5HVX/
public long getLast(){ =,s5>2
return lastExecuteTime; (3j f_
} 4Le{|B
public void run(){ Izfq`zS+\s
long now = System.currentTimeMillis(); vhU#<59a1
if ((now - lastExecuteTime) > executeSep) { tCj\U+;
//System.out.print("lastExecuteTime:"+lastExecuteTime); X9&>.?r
//System.out.print(" now:"+now+"\n"); !Okl3
!fC
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); lvR>%I0`*
lastExecuteTime=now; T!1XL7
executeUpdate(); 9SU/86|N
} AG Gxx?I
else{
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2Fbg"de3-
} pA\"Xe&
} w)>/fG|;
} ;;432^jD
//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 r;"Qu
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类写好了,下面是在JSP中如下调用。 Bv7os3xb
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<% 6ziBGU#.-
CountBean cb=new CountBean(); ?]_A~_J!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); T4;gF6(0]
CountCache.add(cb); K[q-[q#yc
out.print(CountCache.list.size()+"<br>"); J(,{ -d-E
CountControl c=new CountControl(); w6AG:u
c.run(); Ece=loV*l
out.print(CountCache.list.size()+"<br>"); Ol8Yf.e_
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