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: OY+!aG@.
7ytm.lU
CountBean.java Gs^(YGtU
<GSQ2bX[
/* mipi]*ZfXE
* CountData.java q2[+-B)m
* :yd=No@
* Created on 2007年1月1日, 下午4:44 }*xC:A%aS
* #Y/97_2 xa
* To change this template, choose Tools | Options and locate the template under qJ#L)
* the Source Creation and Management node. Right-click the template and choose Ti0
(VdY
* Open. You can then make changes to the template in the Source Editor. c ,Qw;
*/ 7~nIaT
rd|@*^k
package com.tot.count; plzE
-fb1cv~N
/** ~+sne7
6 U
* , LCH2r
* @author zyIza @V(
*/ >l7eoj
public class CountBean { $xKg }cO
private String countType; 0L3Bo3:k
int countId; dL1~]Z
y
/** Creates a new instance of CountData */ m~Lf^gbG?
public CountBean() {} dM);LT8@
public void setCountType(String countTypes){ qkIA,Kgy
this.countType=countTypes; sV9{4T~#|
} aL_;`@4
public void setCountId(int countIds){ BsoFQw4$9
this.countId=countIds; },?-$eyX
} ?7rmwy\
public String getCountType(){ ucIVVT(u
return countType; O+CF/ipX/
} jUV#HT
public int getCountId(){ *!-}lc^4
return countId; GV `idFd
} 842Mydom
} 17MN8SfQ
AxG?zBTFx
CountCache.java xEd#~`Jmr
_*OaiEL+:
/* 0lvb{Zd
* CountCache.java ~FK+bF?%
* ;ph+ZV
* Created on 2007年1月1日, 下午5:01 *g/I&'^
* 'ugR!o1
* To change this template, choose Tools | Options and locate the template under K-g=td/@
* the Source Creation and Management node. Right-click the template and choose UcKWa>:Fi
* Open. You can then make changes to the template in the Source Editor. "9MX,}X*
*/ H4K(SGx
OI;L9\MJc
package com.tot.count; =6"hj,[Q
import java.util.*; f"}0j|Gg
/** +E""8kW- Z
* 'xu7AKpU)
* @author 3V8j>&
*/ Yp?a=R
public class CountCache { \k$]GK-
public static LinkedList list=new LinkedList(); x r+E
/** Creates a new instance of CountCache */ $AL|d[[T[
public CountCache() {} p!rGPyGC
public static void add(CountBean cb){ MRxo|A{
if(cb!=null){ 0X}w[^f
list.add(cb); DI"dY
ug#
} Cbf,X[u
} xr1I8 5kM
} G%W03c
lzQ&)7`
CountControl.java c+\Gd}IJq
:` !mCW`Q-
/* Di5Op(S((
* CountThread.java +$pO
* 16d{IGMz
* Created on 2007年1月1日, 下午4:57 _#\5]D~""
* u.xA}yVS
* To change this template, choose Tools | Options and locate the template under `(w kqa
* the Source Creation and Management node. Right-click the template and choose J3!k*"P
* Open. You can then make changes to the template in the Source Editor. =,}!Ns{k
*/ nG(|7x
5D q{"@E
package com.tot.count; fh5^Gd~
import tot.db.DBUtils; fSb@7L
import java.sql.*; h^3Vd K,
/** RWEgUDX^/
* XQ?)
* @author fe]T9EDA
*/ LnACce
?b
public class CountControl{ 70 DQ/b
private static long lastExecuteTime=0;//上次更新时间 vA $BBXX
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 kQ:>j.^e
/** Creates a new instance of CountThread */ e1Z;\U$&.
public CountControl() {} h: (l+jr
public synchronized void executeUpdate(){ tZ6v@W
Connection conn=null; }Q,C;!'"
PreparedStatement ps=null; iOA3x 8J
try{ JO;`Kz_$
conn = DBUtils.getConnection(); TuT=
conn.setAutoCommit(false); vN[m5)aT
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ~o\]K
for(int i=0;i<CountCache.list.size();i++){ Pp" )hFx
CountBean cb=(CountBean)CountCache.list.getFirst(); YJ;a{)e
CountCache.list.removeFirst(); sRI=TE]s
ps.setInt(1, cb.getCountId()); JZ*?1S>
ps.executeUpdate();⑴ Ffqn|}gb
//ps.addBatch();⑵ sZ(Q4)r
} /:];2P6#X
//int [] counts = ps.executeBatch();⑶ gj(l&F *@
conn.commit(); [@71
}catch(Exception e){ r:b.>5CS)
e.printStackTrace(); Lzb [%?
} finally{ Sv[_BP\^h
try{ D_`)T;<Sp
if(ps!=null) { xo@/k
ps.clearParameters(); X([n>w
ps.close(); I2!&=" 7@
ps=null; v6(l#,
} dXy"yQ>{
}catch(SQLException e){} vt7C
DBUtils.closeConnection(conn); ;
yC`5
} ?J1&,'&
} A&|(%
public long getLast(){ 5^R#e(mr
return lastExecuteTime; F;l<>|vG
} XsCbJ[Z_?q
public void run(){ p~VW3u]
long now = System.currentTimeMillis(); [ Sa
C
if ((now - lastExecuteTime) > executeSep) { =cX"gI[
//System.out.print("lastExecuteTime:"+lastExecuteTime); M>l+[U
//System.out.print(" now:"+now+"\n"); ]$%4;o4O
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); D+nj[8y
lastExecuteTime=now; {ca^yHgGy
executeUpdate(); -"b3q
} |0Ug~jKU
else{ :BiR6>1:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); (4gQe6tA
} Aba%Gh
} /-9+(
} QRix_2+
//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 Al;oI3
?v*7!2;
类写好了,下面是在JSP中如下调用。 X Ow^"=Oa[
jtJ8r5j 1
<% YuuG:Kk
CountBean cb=new CountBean(); YZ+g<HXB
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); mhSsOmJ5
CountCache.add(cb); SQ.Wj?W)
out.print(CountCache.list.size()+"<br>"); {:j!@w 3
CountControl c=new CountControl(); ooxzM `
c.run(); qOanu
out.print(CountCache.list.size()+"<br>"); lBC-G*#
%>