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: Lj7AZ|k
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CountBean.java VaPG-n>Vf
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/* A(X KyEx
* CountData.java j1Ezf=N6`
* 4z)]@:`}z
* Created on 2007年1月1日, 下午4:44 ABkl%m6xf
* "jCu6Rj d
* To change this template, choose Tools | Options and locate the template under _dg\\c
* the Source Creation and Management node. Right-click the template and choose WzWXE(
* Open. You can then make changes to the template in the Source Editor. U!]dEW|G
*/ 0"#HJA44
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package com.tot.count; T{'RV0%
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/** ! P4*+')M
* 2zpr~cB=
* @author DwF hK*
*/ #E]59_
public class CountBean { <N@Gu!N8
private String countType; f
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int countId; QL* IiFR
/** Creates a new instance of CountData */ vSh`&w^*
public CountBean() {} ?ubro0F:
public void setCountType(String countTypes){ 5-M-X#(
this.countType=countTypes; AwN!;t_0+N
} !'Kjx
public void setCountId(int countIds){ LQ% `c
this.countId=countIds; \NC3'G:Ii
} nFn5v'g
public String getCountType(){ N g,j#
return countType; }7X%'Bg=M
}
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public int getCountId(){ p[cX O=
return countId; adw2x pj
} .(vwIb8\_
} .V*^|UXbHi
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CountCache.java 2pAW9R#UV-
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/* 0IpmRH/
* CountCache.java @pxcpXCy
* Js;h%
* Created on 2007年1月1日, 下午5:01 g .\[o@H
* ~XIb\m9H
* To change this template, choose Tools | Options and locate the template under r
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* the Source Creation and Management node. Right-click the template and choose Dzbz)Zst
* Open. You can then make changes to the template in the Source Editor. > P)w?:k
*/ r=4eP(w=
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package com.tot.count; nP$9CA
import java.util.*; ElXFeJ%[G
/** s @C}P
* =Sv/IXX\di
* @author YK\X+"lB
*/ ])!*_
public class CountCache { /(LL3cZK
public static LinkedList list=new LinkedList(); `x|?&Ytmf9
/** Creates a new instance of CountCache */ p#Bi>/C6
public CountCache() {} (#'>(t(4
public static void add(CountBean cb){ <}LC~B!
if(cb!=null){ q*KAk{kR(v
list.add(cb); 16 $B>
} =QsYXK7Mn4
} o}!PQ#`M
} cu6Opq9
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CountControl.java /E>e"tvss
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/* u4j5w
* CountThread.java XilS!,
* P%zK;#8V
* Created on 2007年1月1日, 下午4:57 CWlw0X
* M`>E|"<
* To change this template, choose Tools | Options and locate the template under 1"g<0
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* the Source Creation and Management node. Right-click the template and choose g5yJfRLxp
* Open. You can then make changes to the template in the Source Editor. ]?*wbxU0
*/ r3Ykz%6
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package com.tot.count; Q;u pau
import tot.db.DBUtils; HV.t6@\};
import java.sql.*; O84i;S+-p
/** &NWEqBz*2
* g'gdgfvn
* @author #S(Hd?34,
*/ v1[29t<I!
public class CountControl{ =fbWz
private static long lastExecuteTime=0;//上次更新时间 :r[`.`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 wbHb;]
/** Creates a new instance of CountThread */ TNth
public CountControl() {} +0~YP*I`/
public synchronized void executeUpdate(){
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Connection conn=null; G?ZXWu.
PreparedStatement ps=null; weQ_*<5%
try{ 8RX&k
conn = DBUtils.getConnection(); uS-|wYE
conn.setAutoCommit(false); 2?5>o!C
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); q@qsp&0/
for(int i=0;i<CountCache.list.size();i++){ "#] $r
CountBean cb=(CountBean)CountCache.list.getFirst(); :0ep(<|;
CountCache.list.removeFirst(); _^;Z~/.
ps.setInt(1, cb.getCountId()); :
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ps.executeUpdate();⑴ xmG<]WF>E
//ps.addBatch();⑵ G#CXs:1pd+
} liZxBs
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//int [] counts = ps.executeBatch();⑶ ?0SEMmp`H
conn.commit(); #?E"x/$Y6
}catch(Exception e){ RpK@?[4s
e.printStackTrace(); g*Phv|kI
} finally{ '7/)Ot(
try{ B6"0OIDY"
if(ps!=null) { _+,TT['57s
ps.clearParameters(); `gJ(0#ac
ps.close(); Gq6*SaTk
ps=null; TJN4k@\$2
} <[phnU^
8
}catch(SQLException e){} s S
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DBUtils.closeConnection(conn); (ZGbhMK
}
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} y(&Ac[foS}
public long getLast(){ 6mE\OS-I
return lastExecuteTime; y2v^-q3
} iwq!w6+
public void run(){ F:VIzyMq<
long now = System.currentTimeMillis(); GeqPRah
if ((now - lastExecuteTime) > executeSep) { :Al!1BJQ
//System.out.print("lastExecuteTime:"+lastExecuteTime); ;j7#7MN2_E
//System.out.print(" now:"+now+"\n"); dI2
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); /{[o~:'p
lastExecuteTime=now; mR~&)QBP.
executeUpdate(); [Zrr)8A
} XG?8s
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else{ Fs{*XKv&lH
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); omFz@
} @ 7u 0v
} N;R^h? '
} LLI.8kn7
//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 43w}qY1
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类写好了,下面是在JSP中如下调用。 O2+ 6st
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<% No$3"4wk
CountBean cb=new CountBean(); bLL2
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); FsPw1A$y
CountCache.add(cb); :DNjhZ
out.print(CountCache.list.size()+"<br>"); RNL9>7xV
CountControl c=new CountControl(); D=$)n_F
c.run(); #z(]xI)"
out.print(CountCache.list.size()+"<br>"); xoL\us`A
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