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: ]u5TvI,C
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CountBean.java
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/* 8QTry%
* CountData.java ~3 :VM_
* D
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* Created on 2007年1月1日, 下午4:44 `9r{z;UQ
* )5b_>Uy
* To change this template, choose Tools | Options and locate the template under 6RbDc*
* the Source Creation and Management node. Right-click the template and choose Qbv@}[f
* Open. You can then make changes to the template in the Source Editor.
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package com.tot.count; ;3/}"yG<p
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/** q8$t4_pF
* NAD^10
* @author 1)=
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*/ y8$3kXh
public class CountBean { iW6O9~
private String countType; ?1ey$SSU]
int countId; `NQ
/** Creates a new instance of CountData */ r^
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public CountBean() {} CC=I|/mBM
public void setCountType(String countTypes){ >\1twd{u]
this.countType=countTypes; ,w~3K%B4
} 1x_EAHZ>7
public void setCountId(int countIds){ U:*rlA@_.
this.countId=countIds; rT `sY
} xq;>||B
public String getCountType(){ fJ/INL
return countType; 9W=(D|,,
} '^)'q\v'k
public int getCountId(){ k)3N0]q6
return countId; :\~>7VFg
} =wX;OK|U(^
} 9CS"s_
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CountCache.java $}(Z]z}O ;
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/* qA '^b~
* CountCache.java \r
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* dLYM )-H`>
* Created on 2007年1月1日, 下午5:01 ,&,%B|gT]
* ) 'xyK
* To change this template, choose Tools | Options and locate the template under W$jRS
* the Source Creation and Management node. Right-click the template and choose )"\=
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* Open. You can then make changes to the template in the Source Editor. ~a_hOKU5
*/ 1T#-1n%[k(
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package com.tot.count; cgG*7E
import java.util.*; JAHg_!
/** 2e\"?y OD
* $?F_Qsy{d
* @author IrZjlnht
*/ RP2$(%
public class CountCache { MX]#|hEeQ
public static LinkedList list=new LinkedList(); Lz1KDXr`)+
/** Creates a new instance of CountCache */ "=Z=SJ1D
public CountCache() {}
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public static void add(CountBean cb){ <*J"6x
if(cb!=null){ <zqIq9}r
list.add(cb); )s>|;K{
} "S#$:92
} |vd|;" `
} ,IhQ %)l
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CountControl.java C5(XZscq
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/* Vl$RMW@Ds
* CountThread.java P\dfxR;8%
* L<dh\5#p9Y
* Created on 2007年1月1日, 下午4:57 pbG-uH^
* fP<==DK
* To change this template, choose Tools | Options and locate the template under #q:j~4)h
* the Source Creation and Management node. Right-click the template and choose eY`z\I
* Open. You can then make changes to the template in the Source Editor. 7a_8007$l
*/ imADjBR]
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package com.tot.count; pzRVX8
import tot.db.DBUtils; IsT}T}p,t
import java.sql.*; .~I:Hcf/
/** :Jyr^0`J
* _L)LyQD]T
* @author 8o:h/F
*/ r2f%E:-0G
public class CountControl{ JVg}XwR
private static long lastExecuteTime=0;//上次更新时间 #.u&2eyqQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,sj(g/hg
/** Creates a new instance of CountThread */ c
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public CountControl() {} `%|3c
public synchronized void executeUpdate(){ 1?)h-aN
Connection conn=null; W
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PreparedStatement ps=null; <>KQ8:
try{ +mG"m hF
conn = DBUtils.getConnection(); T=w0T-[f
conn.setAutoCommit(false); WMKxGZg"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); W/RB|TMT
for(int i=0;i<CountCache.list.size();i++){ GF@`~im
CountBean cb=(CountBean)CountCache.list.getFirst(); IV&5a]j
CountCache.list.removeFirst(); :{eYm|2-
ps.setInt(1, cb.getCountId()); sz%]rN6$
ps.executeUpdate();⑴ [GCaRk>b,
//ps.addBatch();⑵ D+AkV|
} !|9@f$Jv
//int [] counts = ps.executeBatch();⑶ i*l=xW;bM
conn.commit(); xX%{i0E
}catch(Exception e){ IRLAsb3
e.printStackTrace(); @sa_/LH!K
} finally{ TyO]|Q5
try{ iPCn-DoIS
if(ps!=null) { 'xuxMav6m
ps.clearParameters(); ,V!Wo4M
ps.close(); F +5
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ps=null; d?5oJ'JU
} rLeQBp'
}catch(SQLException e){} ;|\j][A
DBUtils.closeConnection(conn); nIOSP:'>
} ~W"@[*6w
} a-#$T)mmfj
public long getLast(){ L
return lastExecuteTime; `E;xI v|
} uYO$gRem
public void run(){ Q-iBK*-w
long now = System.currentTimeMillis(); I<W<;A
if ((now - lastExecuteTime) > executeSep) { k N* I_#
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?w'03lr%
//System.out.print(" now:"+now+"\n"); 4<<eqxI$|
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Wf?[GO
lastExecuteTime=now; ?W dY{;&
executeUpdate(); KWYjN
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} ?;w`hA3ei
else{ \u6.*w5TI
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); q(46v`u
}
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} Kl ?C[
} WOgkv(5KN
//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 A]%*ye"NT
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类写好了,下面是在JSP中如下调用。 Q4Wz5n1yp7
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<% lt'N{LFvc
CountBean cb=new CountBean(); )C\/ (
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]w*` }
CountCache.add(cb); a_VWgPVdDS
out.print(CountCache.list.size()+"<br>"); butBS
CountControl c=new CountControl(); B)d 4]]4\\
c.run(); "Qc4v@~)
out.print(CountCache.list.size()+"<br>"); 4K~>
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