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: [TvH7ott'1
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CountBean.java 'CsD[<
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/* >tXn9'S
* CountData.java Fy5xIRyI\F
* ?I&ha-."
* Created on 2007年1月1日, 下午4:44 |3W\^4>,
* .j:[R.
* To change this template, choose Tools | Options and locate the template under +ia F$
* the Source Creation and Management node. Right-click the template and choose SC)4u l%
* Open. You can then make changes to the template in the Source Editor. V*xT5TljS-
*/ |rkj$s,
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package com.tot.count; K-F@OSK'
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/** Ps5UX6\ .m
* ZYZQ?FN
* @author h[72iVn
*/ }C.M4{a\
public class CountBean { W@v@|D@
private String countType; 4thLK8/c5g
int countId; q3Re
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/** Creates a new instance of CountData */ p*)RP2
public CountBean() {} uhvmh
public void setCountType(String countTypes){ N r5
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this.countType=countTypes; eYBo*
} [RG&1~
public void setCountId(int countIds){ a(&!{Y1bt
this.countId=countIds; HByk 1
} YP{)jAK
public String getCountType(){ @54, I
return countType; X~t] qT
} XH&Fn+
public int getCountId(){ 3>qUYxG8
return countId; VQF!|*#
} B4 5B`Ay
} Y\luz`v
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CountCache.java j%Mz;m4y
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/* }yCJ#}
* CountCache.java vAiNOpz#
* J&%vBg^
* Created on 2007年1月1日, 下午5:01 E"!C3SC [
* 'gd3 w~
* To change this template, choose Tools | Options and locate the template under R[ p. )F7
* the Source Creation and Management node. Right-click the template and choose itb0dF1G
* Open. You can then make changes to the template in the Source Editor. MJ'|$b}
*/
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package com.tot.count; |E$Jt-'
import java.util.*; 5&q@;vR
/** YgiwtZ5FY
* o.U$\9MNP
* @author 4} uX[~e&
*/ #=/eu=
public class CountCache { bUbM }
public static LinkedList list=new LinkedList(); *m:h0[[J
/** Creates a new instance of CountCache */ nB2AmS
public CountCache() {} :UMg5eZ
public static void add(CountBean cb){ *%_:[>
if(cb!=null){ Q/r0p>
list.add(cb); }ny,Nl
} L'=2Uk#.D
} ?P4@U9i
} -IhFPjQ
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CountControl.java 3?I^D /K^
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/* %J4]T35^2
* CountThread.java f2Frb
* SvC|"-[mJ
* Created on 2007年1月1日, 下午4:57 F_;oZ
* "8|y
* To change this template, choose Tools | Options and locate the template under oZ95 )'L,
* the Source Creation and Management node. Right-click the template and choose opTDW)
* Open. You can then make changes to the template in the Source Editor. OQ"%(w>Hb
*/ Z0T{1YEJ
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package com.tot.count; j eF1{ %
import tot.db.DBUtils; ?Z%Ja_}8ma
import java.sql.*; h+F@apUS
/** M$g%kqa
* (;YO]U4
* @author '8`{u[:
*/ I$0JAy
public class CountControl{ 7onMKMktM%
private static long lastExecuteTime=0;//上次更新时间
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -a(f-
/** Creates a new instance of CountThread */ =1t#$JG
public CountControl() {} m)9N9Ii#)
public synchronized void executeUpdate(){ rZ<0ks
Connection conn=null; >kOc a
PreparedStatement ps=null; k7P~*ll$
try{ aVvi_cau
conn = DBUtils.getConnection(); l=*^FK]L`
conn.setAutoCommit(false); |sz`w^#
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )3v0ex@Jl
for(int i=0;i<CountCache.list.size();i++){ *0M#{HQ
CountBean cb=(CountBean)CountCache.list.getFirst(); 8[5%l7's
CountCache.list.removeFirst(); *9e T#dH
ps.setInt(1, cb.getCountId()); _ b}\h,Ky
ps.executeUpdate();⑴ hH:7
//ps.addBatch();⑵ Nw $io8:d
} vco/h
//int [] counts = ps.executeBatch();⑶ I!lzOg4~
conn.commit(); SzkF-yRd
}catch(Exception e){ s`Fv!
e.printStackTrace(); lM Gz"cym
} finally{ J411bIxD+q
try{ hk4f)z
if(ps!=null) { ?cdSZ'49[
ps.clearParameters(); ep<A d
ps.close(); vai.",b=n6
ps=null; 7t`<`BY^
} 6~GaFmW=
}catch(SQLException e){} ;>[).fX>/
DBUtils.closeConnection(conn); g6EdCG.V
} =Xzqp,
} f ^mxj/%L
public long getLast(){ YXXUYi~!f
return lastExecuteTime; Z:aDKAboU
} nMc3.fM
public void run(){ Mh'QD)28c
long now = System.currentTimeMillis(); wqBGJ
if ((now - lastExecuteTime) > executeSep) { ie^:PcU
//System.out.print("lastExecuteTime:"+lastExecuteTime); [bkMl+:/HG
//System.out.print(" now:"+now+"\n"); @eMDRbgq;[
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); M x j
lastExecuteTime=now; AoyU1MR(
executeUpdate(); pcNVtp'V
} kbBD+*
else{ ^ cN-
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _m;cX!+~_
} XG<J'3
} `
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} q:#,b0|bv
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 #/sKb2eQ
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类写好了,下面是在JSP中如下调用。 |GE3.g
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<% h*)spwF-
CountBean cb=new CountBean(); ?
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); mU:C{<Z
CountCache.add(cb); tp$NT.z
out.print(CountCache.list.size()+"<br>"); >#dNXH]9
CountControl c=new CountControl(); R6dw#;6{I
c.run(); |tz1'YOB
out.print(CountCache.list.size()+"<br>"); },0fPkVsU
%>