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: .'1]2/ad
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CountBean.java l2!ztK1^
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/* u69G
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* CountData.java :N4?W}r.
* ,{RWs^W2
* Created on 2007年1月1日, 下午4:44 %LL?' &&
* I'R|B\
* To change this template, choose Tools | Options and locate the template under )4w3$Q
* the Source Creation and Management node. Right-click the template and choose 7c'OIY].,
* Open. You can then make changes to the template in the Source Editor. SzjylUYV
*/ ]4_)WUS.c
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package com.tot.count; 2Nx#:Rz
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/** f1Gyl
* pN;T t+}
* @author h4>q~&Pd
*/ Y-"7R>^I
public class CountBean { q+67Wc=
private String countType; g.Kyfs4`
int countId; !xC IvKW
/** Creates a new instance of CountData */ c=:A/z{
public CountBean() {} PtKrks|y
public void setCountType(String countTypes){ A$J?-
this.countType=countTypes; v kW2&
} 2s`~<EF N
public void setCountId(int countIds){ n#5 pd;!n
this.countId=countIds; BMbZ34^e
} W^9=z~-h
public String getCountType(){ (=D^BXtH|
return countType; kkV*#IZ
} K./L'Me
public int getCountId(){ J35[GZ';D
return countId; ;MKfssG
} YksJ$yH^
} >56;M7b(K
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CountCache.java <K~mg<ff$
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/* PKNpR
* CountCache.java ddeH-Z
* >Q# !.lH$W
* Created on 2007年1月1日, 下午5:01 hjoxx
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*
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* To change this template, choose Tools | Options and locate the template under dO[pm0
* the Source Creation and Management node. Right-click the template and choose nc>Ae`"(
* Open. You can then make changes to the template in the Source Editor. 6[C>"s}Ol
*/ ]0@
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package com.tot.count; X7 fJ+Cn
import java.util.*; 2Rs-!G<]
/** [-x]%
* x;>~;vmi
* @author E{Y)=tW[
*/ *}N J
public class CountCache { 7{DSLKtN
public static LinkedList list=new LinkedList(); vEb_z[gd
/** Creates a new instance of CountCache */ 9|LV
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public CountCache() {} 2sqNTuO6,|
public static void add(CountBean cb){ gPM<LO`;i
if(cb!=null){ )XL}u4X
list.add(cb); @D&}ZV=J
} ^U@Erc#d
} 08 aZU
} wWUt44:0O
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CountControl.java >_um-w #C
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/* U6R~aRJ;
* CountThread.java _,9/g^<
* `!iVMTp
* Created on 2007年1月1日, 下午4:57 G~Mxh,aD$>
* .R>4'#8q
* To change this template, choose Tools | Options and locate the template under J |TA12s
* the Source Creation and Management node. Right-click the template and choose SXf Aw)-n
* Open. You can then make changes to the template in the Source Editor. ){{]3r
*/ D^JuL6U
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package com.tot.count; 3a]Omuu|=
import tot.db.DBUtils; ZU-vZD>
import java.sql.*; N| L Ey
/** mg7Q~SLL{
* 9-?[%8
* @author
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*/ )'gO?cN
public class CountControl{ C'jE'B5b
private static long lastExecuteTime=0;//上次更新时间 Qh.
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 a6fqtkZ x
/** Creates a new instance of CountThread */ 00)=3@D
public CountControl() {} jZvQMW
public synchronized void executeUpdate(){ 8g CQ0w<
Connection conn=null; P~"`Og+
PreparedStatement ps=null; A~UDtXN*4
try{ PE-P(T3s[8
conn = DBUtils.getConnection(); jI9Kn41
conn.setAutoCommit(false); B^u qu
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Ss~dK-{e7
for(int i=0;i<CountCache.list.size();i++){ ?sBbe@OC?
CountBean cb=(CountBean)CountCache.list.getFirst(); #4<Rs|K
CountCache.list.removeFirst(); *w;=o}`
ps.setInt(1, cb.getCountId()); 89{@ 2TXR
ps.executeUpdate();⑴ _~b$6Nf!83
//ps.addBatch();⑵ ,|
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} "Gh?hU,WWZ
//int [] counts = ps.executeBatch();⑶ Tp0^dZ M+
conn.commit(); tag~SG`ov
}catch(Exception e){ /*8Ms`
e.printStackTrace(); r6*~WM|Sq7
} finally{ e)2s2y@zi
try{ %SJ9Jr,
if(ps!=null) { QjlwT 2o'
ps.clearParameters(); }6V` U9^g
ps.close(); 3bp'UEF^k
ps=null; oAgO3x
} h5?yrti
}catch(SQLException e){} /"M7YPX;
DBUtils.closeConnection(conn); -K K)}I`
} 9e|]H+y
} ^"!j m
public long getLast(){ ]M;aVw<!
return lastExecuteTime; tzeS D C
} aN5 w
public void run(){ b8@gv OB
long now = System.currentTimeMillis(); s-He
if ((now - lastExecuteTime) > executeSep) { ITu6m<V
//System.out.print("lastExecuteTime:"+lastExecuteTime); kM,$0@
//System.out.print(" now:"+now+"\n"); naT;K0T=
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); . !|3a
lastExecuteTime=now; ,\BGxGNAmV
executeUpdate(); XfXqq[\N
} pU |SUM
else{ l}$Pv?T,2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); /J"U`/
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} [z1[4
} 0V&6"pF_Y'
} ]`2=<n;=
//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 62 biOea
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类写好了,下面是在JSP中如下调用。 +h$)l/>:
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<% :u7y k@
CountBean cb=new CountBean(); : _>/Yd7-&
cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); 9Xg+$/
out.print(CountCache.list.size()+"<br>"); m};Qng]
CountControl c=new CountControl(); 'o#ve72z1
c.run(); :Sx!jx>W
out.print(CountCache.list.size()+"<br>"); )PU?`yLTr
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