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: usOIbrQ
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CountBean.java <rFKJ^ B
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/* Xw<N nvz6
* CountData.java hFr?84sAd
* TkV*^j5
* Created on 2007年1月1日, 下午4:44 &HYs^|ydrr
* [9xUMX^}
* To change this template, choose Tools | Options and locate the template under zIgD R
* the Source Creation and Management node. Right-click the template and choose @Xq3>KJ_)H
* Open. You can then make changes to the template in the Source Editor. yf7$m_$C'
*/ 3bPF+(`J
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package com.tot.count; d=8q/]_p
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/** d`&F
* Oj^qh+r
* @author 4^Ghn
*/ Rjz~n38.
public class CountBean { >6"u{Qmr
private String countType; cG~-OHU
int countId; 6zJfsKf$
/** Creates a new instance of CountData */ G!3d!$t
public CountBean() {} U>s$}Y:+Z
public void setCountType(String countTypes){ l:H}Y3_I
this.countType=countTypes; JJ$q *
} L.) 0!1
public void setCountId(int countIds){ ESt@%7.F
this.countId=countIds; &?gvW//L2
} vZl]C%
public String getCountType(){ \,5OPSB
return countType; +>wBGVvS
} #0;ULZ99aH
public int getCountId(){ 9akIu.H
return countId; sHQ82uX
} L\Y4$e9bF8
} _]# ^2S
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CountCache.java (+ibT;!]
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/* 5x:dhkW
* CountCache.java
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* f Nnemn@>
* Created on 2007年1月1日, 下午5:01 qoXncdDHZ
* c$skLz
* To change this template, choose Tools | Options and locate the template under 1||\3L/
* the Source Creation and Management node. Right-click the template and choose lmRdl>
* Open. You can then make changes to the template in the Source Editor. <4|/AF*>
*/ jA}b=c
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package com.tot.count; at-+%e
import java.util.*; *P.Dbb8vn
/** b,Vg3BS
* m<X[s
* @author #{BHH;J+
*/ <)dHe:
public class CountCache { iYk4=l
public static LinkedList list=new LinkedList(); _^5OoE"}!
/** Creates a new instance of CountCache */ yxx'g+D*
public CountCache() {} \6)]!$F6:
public static void add(CountBean cb){ HDY2<Hzc
if(cb!=null){ 6SGV}dAx
list.add(cb); +xc1cki_{
} Q`kJ3b
} |r%NMw #y
} XDdF7i}
%7y8a`}
CountControl.java GWvw<`4
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/* &x YO6_.
* CountThread.java !\6<kQg#
* "h'+!2mf
* Created on 2007年1月1日, 下午4:57 NlG~{rfI
* +M=`3jioL
* To change this template, choose Tools | Options and locate the template under gZHuyp(B
* the Source Creation and Management node. Right-click the template and choose ~stJO]) a
* Open. You can then make changes to the template in the Source Editor. 7H l>UX,|
*/ EIrAq!CA
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package com.tot.count; 1XpG7
import tot.db.DBUtils; {)?:d6"
import java.sql.*; 8%ea(|Wjg
/** f)x(sk
* (E{}iq@2
* @author LN0pC}F
*/ pRys 5/&v
public class CountControl{ lPyY
private static long lastExecuteTime=0;//上次更新时间 r&y0`M
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 X;&Iu{&=
/** Creates a new instance of CountThread */ |Fi{]9(G2
public CountControl() {} JJZu%9~[
public synchronized void executeUpdate(){ yCvP-?2
Connection conn=null; YLsOA`5X
PreparedStatement ps=null; xMs!FMn[
try{ /Bw
<?:
conn = DBUtils.getConnection(); 1p5n}|
conn.setAutoCommit(false); 2Wn*J[5
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); }]
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for(int i=0;i<CountCache.list.size();i++){ NHL9qL"qk
CountBean cb=(CountBean)CountCache.list.getFirst(); ,6EhtNDu
CountCache.list.removeFirst(); 2rV]n
ps.setInt(1, cb.getCountId()); @=sM')f&
ps.executeUpdate();⑴ SNJSRqWL/
//ps.addBatch();⑵ fg)VO6Wo&
} [} zzG@g,J
//int [] counts = ps.executeBatch();⑶ )! eJW(
conn.commit(); r@a]fTf
}catch(Exception e){ 48IrC_0j
e.printStackTrace(); %b[>eIJU#
} finally{ (QTF+~)
try{ ![i)_XO
if(ps!=null) { hm*cGYV/
ps.clearParameters(); `y|_hb
ps.close(); l+a1 `O
ps=null; %E\zR/
} ^B)f!HtU
}catch(SQLException e){} I`f5)iF?0
DBUtils.closeConnection(conn); Z%Fc
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} o (k{Ed
} _a#k3r
public long getLast(){ kV+%(Gl8
return lastExecuteTime; u4h0s1iI
} !-t,r%CG
public void run(){ 3=Q:{
long now = System.currentTimeMillis(); F8S>Ld
if ((now - lastExecuteTime) > executeSep) { Nq%ir8hE
//System.out.print("lastExecuteTime:"+lastExecuteTime); -VeCX]
//System.out.print(" now:"+now+"\n"); `*l aUn
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ?I[*{}@n"
lastExecuteTime=now; uGv|!UQw
executeUpdate(); o"6
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} N;`/>R4|I
else{ h
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 31~nay15
} ~Pj q3etk
} :r(dMU3%
} ZTibF'\5N
//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 $g^D1zkuDT
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类写好了,下面是在JSP中如下调用。 * bd3^mP
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<% ^v`naA(
CountBean cb=new CountBean(); S,j. ?u*!
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `BQv;NtP
CountCache.add(cb); =W &Mt
out.print(CountCache.list.size()+"<br>"); QgI[#d{
CountControl c=new CountControl(); d[>HxPwo
c.run(); ?=ffv]v|
out.print(CountCache.list.size()+"<br>"); gW,hI>
%>