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: #PmF@
CHR
Wcn^IQ
CountBean.java Tr}c]IP*
ZD0Q<8%
/* P>kS$U)
* CountData.java XH2g:$
* [w~1e)D
* Created on 2007年1月1日, 下午4:44 .|{*.YE
* }qXi;u))
* To change this template, choose Tools | Options and locate the template under =RUKN38
* the Source Creation and Management node. Right-click the template and choose >UuLSF}
* Open. You can then make changes to the template in the Source Editor. <OW` )0UX
*/ {{=7 mbc
+Mv0X%(N
package com.tot.count; w>rglm&
$X-,6*
/** Qo{^jDe,c*
* `)H.TMI
* @author Z!|nc.
*/ "mT~_BsD
public class CountBean { P67r+P,
private String countType; wEzLfZ Oz/
int countId; +|(
eP_
/** Creates a new instance of CountData */ x%x:gkq
public CountBean() {} .f&,~$e4
public void setCountType(String countTypes){ 8X*6i-j5E
this.countType=countTypes; ?~S\^4]
} '1r:z, o|
public void setCountId(int countIds){ 94|BSxc
this.countId=countIds; iQin|$F_O
} l=
!KZaH
public String getCountType(){ w>VM--
return countType; jPA?0h
} WZ~rsSZSV
public int getCountId(){ Fv5@-&y$W
return countId; xp>ra2A
} se$GE:hC1Q
} ,1F3";`n[
ZZFa<AK4
CountCache.java +l&ZN\@0X
{b+!0[
/* P*R`3Y,
* CountCache.java
&gcKv1a\
* |7UR_(}KC
* Created on 2007年1月1日, 下午5:01 0ltq~K
* t~ Q{\!
* To change this template, choose Tools | Options and locate the template under (?YTQ8QR
* the Source Creation and Management node. Right-click the template and choose S1;#58
* Open. You can then make changes to the template in the Source Editor. MBDu0
[c
*/ 0j4bu}@
6#.z:_
package com.tot.count; q}tLOVu1
import java.util.*; hU+sg~E
/** m[Px|A5{
* ;wgm
'jr
* @author SG;]Vr
*/ @+:S'mAQC
public class CountCache { *w59BO&M4
public static LinkedList list=new LinkedList(); :kflq
/** Creates a new instance of CountCache */ [L]
ca*
public CountCache() {} @B*?owba>
public static void add(CountBean cb){ lySeq^y?Q
if(cb!=null){ D*DCMMp=0
list.add(cb); TR5"K{WDx
} 6}n>Nb;L"
} FSIV\ u
} B@=+Fg DD
PDzVXLpC
CountControl.java UP 75}h9
[F*t2 -ta
/* G?8LYg!-
* CountThread.java `\(Fax
* yx4B!U
* Created on 2007年1月1日, 下午4:57 t+W+f
* h~urZXD<
* To change this template, choose Tools | Options and locate the template under $j)Er.!9|R
* the Source Creation and Management node. Right-click the template and choose IFH%R>={
* Open. You can then make changes to the template in the Source Editor. Ma:xxsH.
*/ j^"Z^TEBT
~}i&gd|(
package com.tot.count; 88$G14aXEk
import tot.db.DBUtils; pe Y( 4#
import java.sql.*; #|
`W ]
/** L8Z[Ly+_
* /KO!s,Nk
* @author 5tX|@Z:
z
*/ E#URTt:&>
public class CountControl{ MP-A^QT
private static long lastExecuteTime=0;//上次更新时间 5^t68
WOl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ]m{;yOQdsC
/** Creates a new instance of CountThread */ P)XkqOGpT9
public CountControl() {} t^)q[g
public synchronized void executeUpdate(){ EtWpB g
Connection conn=null; qN1(mxa.?
PreparedStatement ps=null; \( LKLlam
try{ OziG|o@I
conn = DBUtils.getConnection(); cYFR.~p
conn.setAutoCommit(false); U{q6_z|c
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); p{"p<XFyO
for(int i=0;i<CountCache.list.size();i++){ pv~XZ(J.1
CountBean cb=(CountBean)CountCache.list.getFirst(); mR,p?[P
CountCache.list.removeFirst(); |Vs|&0
ps.setInt(1, cb.getCountId()); OY*BVJ^
ps.executeUpdate();⑴ YQG[8I
//ps.addBatch();⑵ JUok@6
} ;_R;P;<
//int [] counts = ps.executeBatch();⑶
&THM]3:
conn.commit(); VHsuC$3W
}catch(Exception e){ c@1C|
e.printStackTrace(); 8c\mm 0n
} finally{ L01R.3Z+
try{ 5YUn{qtD
if(ps!=null) { #IDDKUE
ps.clearParameters(); @I2m4Q{O
ps.close(); s[)2z3
ps=null; 'm# -)R!
} wb2N$Ew=
}catch(SQLException e){} o^wj_#ai$
DBUtils.closeConnection(conn); ez%RWck
} (k"|k
} 0I* ^VGZ
public long getLast(){ k2sb#]-/}
return lastExecuteTime; Zk$AAjC&
} XA5gosq
public void run(){ F'lG=c3N
long now = System.currentTimeMillis(); HdGAE1eU]}
if ((now - lastExecuteTime) > executeSep) { ,GS8Gu
//System.out.print("lastExecuteTime:"+lastExecuteTime); BhJqMK>'S
//System.out.print(" now:"+now+"\n"); Ne,7[k
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); E,JDO d}
lastExecuteTime=now; AGQCk*dm
executeUpdate(); \/$T 3f`x
} W}EI gVHs
else{ @g(N!n~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); us\@n"
} PA5ET@mD
} MI0'ou8l
} s<5q%5ix3
//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 SE)_5|k*
=H.l/'/Z
类写好了,下面是在JSP中如下调用。 z11;r]VI
S,fMGKcq
<% Za}*6N=?*
CountBean cb=new CountBean(); .+]e9mV
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); *E+2E^B
CountCache.add(cb); }OJ*o
out.print(CountCache.list.size()+"<br>"); `sQ\j Nu
CountControl c=new CountControl(); Yr-a8aSTE5
c.run(); 9G` 2t~%
out.print(CountCache.list.size()+"<br>"); 18z{d9'F
%>