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: &>}.RX]t
:B#EqeI
CountBean.java y~#\#w{
ZW ye>]
/* 2o{@nN8%
* CountData.java %= u/3b:o
* $>vy(Y
* Created on 2007年1月1日, 下午4:44 m^$5K's&
* qMgfMhQ7DU
* To change this template, choose Tools | Options and locate the template under hN4VlNKu
* the Source Creation and Management node. Right-click the template and choose &zN@5m$k;
* Open. You can then make changes to the template in the Source Editor. `!c,y~r[
*/ .K9l*-e[=
cqQRU
package com.tot.count; GfsBQY/
GEE
]Kr
/** dXP6"V@iI
* 9={N4}<
* @author >iy^$bqF
*/ >a]t<
public class CountBean { ' Js?N
private String countType; eOrYa3hQ
int countId; CM 9P"-
/** Creates a new instance of CountData */ J~J@ ]5/
public CountBean() {} N_vXYaY
public void setCountType(String countTypes){ ;/Q6i
this.countType=countTypes; \REc8nsLy
} d7~j^v)=^
public void setCountId(int countIds){ 9y+[o
this.countId=countIds; NiTJ}1 l
} )1_(>|@oi
public String getCountType(){ nUqy1(
return countType; oeNzHp_
} k}BDA|\s
public int getCountId(){ ]bfqcmh<
return countId; N$'>XtO
} b[g.}'^yht
} {,f[r*{Y
rA#s
CountCache.java G.ud1,S#
:ej_D}
/* h*'d;_(,
* CountCache.java #{>uC&jD
* .}p|`3$P
* Created on 2007年1月1日, 下午5:01 VG\mo?G
* $I(}r3r
* To change this template, choose Tools | Options and locate the template under *aG"+c6|
* the Source Creation and Management node. Right-click the template and choose YKq0f=Ij
* Open. You can then make changes to the template in the Source Editor. 6PJ'lA;*b
*/ Y`]rj-8f0B
`e*61k5
package com.tot.count; =~",/I?
import java.util.*; VKf6|ae
/** U9F6d!:L7A
* wiBuEaUkW
* @author 28+HKbgK
*/ paYz[Xq
public class CountCache { D2?S,9+E_
public static LinkedList list=new LinkedList(); w06gY
/** Creates a new instance of CountCache */ +{0=<2(EC
public CountCache() {} I9,8HtnA
public static void add(CountBean cb){ PHl4 vh#E!
if(cb!=null){ z"3H{ A
list.add(cb); +Z$a1Y@
} r"[L0Cbb
} @|'Z@>!/pV
} #8E?^d
XJ\_V[WA
CountControl.java :1NYpsd.i
ZZwBOGVU
/* Hq-v@@0 *
* CountThread.java K_FBy
* VHj*aBHB
* Created on 2007年1月1日, 下午4:57 N&,"kRFFo
* 4zwif&
* To change this template, choose Tools | Options and locate the template under ^W k0*.wg
* the Source Creation and Management node. Right-click the template and choose G-sa
L*
* Open. You can then make changes to the template in the Source Editor. Ul9b.`6
*/ S~} +ypV
fW[_+r]
package com.tot.count; W -3w7^
import tot.db.DBUtils; lvG3<ls0K$
import java.sql.*; W >Kp\tD
/** 78gob&p?
* 6eOxF8
* @author vevx|<9,
*/ 83X/"2-K
public class CountControl{ cUYX1a)8
private static long lastExecuteTime=0;//上次更新时间 :
qr}M
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &9k"9
/** Creates a new instance of CountThread */ `c> A>c|
public CountControl() {} QZz&1n
public synchronized void executeUpdate(){ x9TuweG
Connection conn=null; $F<%Jl7_Z
PreparedStatement ps=null; mJ/^BT]
try{ @i\7k(9:A
conn = DBUtils.getConnection(); 0;'j!`l9
conn.setAutoCommit(false); =:kiSrBS3t
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n2H&t>N
for(int i=0;i<CountCache.list.size();i++){ \gjl^#;
CountBean cb=(CountBean)CountCache.list.getFirst(); uTxX`vH@!
CountCache.list.removeFirst(); D~XU`;~u
ps.setInt(1, cb.getCountId()); 9j9YQ2
ps.executeUpdate();⑴ {P,>Q4N
//ps.addBatch();⑵ tvv[$b&
} .Ydr[
//int [] counts = ps.executeBatch();⑶ iz,]%<_PE
conn.commit(); 9$n+-GSK
}catch(Exception e){ nqBG]y aI
e.printStackTrace(); /YS@[\j4
} finally{ q|?`Gsr
try{ 9@JlaY)0
if(ps!=null) { *1%e%G
ps.clearParameters(); p|xs|O6{
ps.close(); GP0[Y
ps=null; &E} I
} "h^A]t;qe
}catch(SQLException e){} v#{G8'+%
DBUtils.closeConnection(conn); yIn/Y 0No
} IS3e|o*]MP
}
zjZ;xn
public long getLast(){ g|_HcaW
return lastExecuteTime; @2)t#~Wc4h
} b\<lNE!L
public void run(){ f>.`xC{
long now = System.currentTimeMillis(); J
r=REa0
if ((now - lastExecuteTime) > executeSep) { /F\>Z]
//System.out.print("lastExecuteTime:"+lastExecuteTime); kxt\{iy4
//System.out.print(" now:"+now+"\n"); r@N39O*Wq
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Gsx^j?
lastExecuteTime=now; N`
@W%
executeUpdate(); *93l${'
} a/wUeW
else{ we6+2
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); [ flu|v
} n23%[#,r
} :mCw.Jz<h
} Qivf|H619
//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_4K+
-K
~z-?rW
类写好了,下面是在JSP中如下调用。 'Qp&,xK
c+)36/; X
<% [qO5~E`;
CountBean cb=new CountBean(); r_qncy,F
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 4eDmLC"Y
*
CountCache.add(cb); F:[Nw#gj/
out.print(CountCache.list.size()+"<br>"); gNMKGf\Y
CountControl c=new CountControl(); r_!{!i3B
c.run(); -+j9X;h:
out.print(CountCache.list.size()+"<br>"); <=5,(a5g
%>