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: 82YTd(yB
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CountBean.java z=N'evx~
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/* !Jh-v
* CountData.java G>M#
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* f:B+R
* Created on 2007年1月1日, 下午4:44 .*r?zDV
* `*&*jdq&i
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose xA`Q4"[I
* Open. You can then make changes to the template in the Source Editor. (NFq/w%
*/ q<@f3[A
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package com.tot.count; G+=euK2]
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/** &[3 xpi{v
* Fs|fo-+H}k
* @author I+!w9o2nZ
*/ '8 1M%KO
public class CountBean { ']ya_ v~e
private String countType; Zi|MWaA.f
int countId; Zuo7MR
/** Creates a new instance of CountData */ ^Gq4Yr
public CountBean() {} I
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public void setCountType(String countTypes){ y{uRh>l
this.countType=countTypes; zg.'
} Kg VLXI6
public void setCountId(int countIds){ oA(jtX[(
this.countId=countIds; ^e"BY(
} IU{~{(p"
public String getCountType(){ T@U_;v|rf
return countType; E=Ah_zKU
} J*-m!0 5
public int getCountId(){ 38L8AJqD
return countId; E&Pv:h,pV&
} 1/jJ;}
} X)e6Y{vO
}9/30
CountCache.java $LRvPan`
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/* lf4-Ci*X
* CountCache.java 05gU~6AF
* D(Pd?iQIO
* Created on 2007年1月1日, 下午5:01 yc8iT`
* SuB;Nb7r`
* To change this template, choose Tools | Options and locate the template under c_~)#F%P
* the Source Creation and Management node. Right-click the template and choose [uT&sZxmg
* Open. You can then make changes to the template in the Source Editor. Sqed*
*/ Lp5LRw
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package com.tot.count; lE78Yl]
import java.util.*; ?_%*{]mt(
/** /+1+6MqRn*
* p(8H[L4Y
* @author R(74Px,/
*/ >)=FS.?]
public class CountCache { H1yl88K
public static LinkedList list=new LinkedList(); mQ;b'0&
/** Creates a new instance of CountCache */ f$Nz).(
public CountCache() {} Pp7}|/
public static void add(CountBean cb){ |#D3~au
if(cb!=null){ Dkayk
list.add(cb); VE+Q Y9(
} :XxsD D
} u>
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} +7U$qEG
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CountControl.java VU J*\Sg
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/* 3 q^3znt
* CountThread.java %E}f7GT4
* 6%sX<)n%]
* Created on 2007年1月1日, 下午4:57 -%E+Yl{v
* y))d[1E
* To change this template, choose Tools | Options and locate the template under !o+#T==p
* the Source Creation and Management node. Right-click the template and choose %"r3{Hs
* Open. You can then make changes to the template in the Source Editor. (TM1(<j
*/
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package com.tot.count; #K.OJJaG
import tot.db.DBUtils; W=|sy-N{2
import java.sql.*; *IG} /O.VT
/** X!ZUR^
* 8)\TdtBf9
* @author *v
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*/ &m&Z^CA
public class CountControl{ `wj<d>m
private static long lastExecuteTime=0;//上次更新时间 WPs6)8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [#`)Bb&w
/** Creates a new instance of CountThread */ bgq/]fI}
public CountControl() {} J.W0F# ?
public synchronized void executeUpdate(){ X,y0J
Connection conn=null; cK%Sty'8+
PreparedStatement ps=null; .|^L\L(!
try{ 1v)ur\>R
conn = DBUtils.getConnection(); [`Seh $
conn.setAutoCommit(false); M>nplHq
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); tGDsZ;3Yr
for(int i=0;i<CountCache.list.size();i++){ LG0+A}E=C
CountBean cb=(CountBean)CountCache.list.getFirst(); )ZC0/>R
CountCache.list.removeFirst(); BF{v0Z0/}k
ps.setInt(1, cb.getCountId()); FBJw (.Jr
ps.executeUpdate();⑴ ZjF5*A8l
//ps.addBatch();⑵ pKJ0+mN#"
} :c[iS~ ~Y
//int [] counts = ps.executeBatch();⑶ \CNv,HUm3
conn.commit(); _^]2??V
}catch(Exception e){ -7,xjn
e.printStackTrace(); ;*>Y8^K&Q
} finally{ EVZuwbO)|
try{ |(G^3+5Uwm
if(ps!=null) { HJWk%t<
ps.clearParameters(); .Y|5i^i9{
ps.close();
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ps=null; M:K5r7Q!yv
} mj:X'BVA
}catch(SQLException e){} @ px2/x
DBUtils.closeConnection(conn); i,|2F9YH
} `d]D=DtH
} BQ!v\1'C
public long getLast(){ P7np
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return lastExecuteTime; x8
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} bwN>E+
public void run(){ fGS5{dti
long now = System.currentTimeMillis(); p?F%a;V3
if ((now - lastExecuteTime) > executeSep) { D32~>J.F
//System.out.print("lastExecuteTime:"+lastExecuteTime); '*gY45yT`
//System.out.print(" now:"+now+"\n"); n=Qz7N(M
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); !o +[L
lastExecuteTime=now; 6/e+=W2
executeUpdate(); zr#n^?m
} 6?8x[l*5M
else{ {[&$W8Li
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); s[6y|{&ze
} v3>jXf
} $0+n0*fp
} $bSnbU<
//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 &(&5ao)5
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类写好了,下面是在JSP中如下调用。 L-SWs8
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<%
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CountBean cb=new CountBean(); H|@R+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); $}_a`~u
CountCache.add(cb); vk;]9o j*
out.print(CountCache.list.size()+"<br>"); qcpAjjK
CountControl c=new CountControl(); a2Q_K2t
c.run(); 4FLL*LCNX
out.print(CountCache.list.size()+"<br>"); (NB\wJg
$
%>