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: 1,=:an
wzy[sB274
CountBean.java z$^wCd:
_}[WX[Le{
/* *e [*
* CountData.java wA$?e}
* @cIYS%iZ
* Created on 2007年1月1日, 下午4:44 kkZ}&OXS;
* <VD7(j]'^
* To change this template, choose Tools | Options and locate the template under C<teZz8/w
* the Source Creation and Management node. Right-click the template and choose fSd|6iFH
* Open. You can then make changes to the template in the Source Editor. \h'7[vkr
*/ <b"^\]l
jo&j<3i
package com.tot.count; &v0]{)PO
.t[u_tBL
/** )T9Cv8
* F1BvDplQ>G
* @author wowf1j-
*/ Vq0X:<9
public class CountBean { F_:Wu,dUZ
private String countType; cr -5t4<jK
int countId; KJJ:fG8'
/** Creates a new instance of CountData */ j_,/U^Ws|f
public CountBean() {} E8av/O
VUd
public void setCountType(String countTypes){ Mhn1-ma:
this.countType=countTypes; G.O;[(3ab
} neu<zSS
public void setCountId(int countIds){ Q^va+O
this.countId=countIds; ">=E p+ix
} to).PI?
public String getCountType(){ r&xIVFPI[
return countType; H2|'JA#v
} x7e0&
public int getCountId(){ F^{31iU~CX
return countId; 'eBD/w5U
} )6%*=-
} e=h-}XRC
!D1#3?L
CountCache.java LodP,\T
~6t<`&f
/* 7l-MVn_8
* CountCache.java fr`#s\JKw
* [@/p 8I
* Created on 2007年1月1日, 下午5:01 0.+Eo.AX4M
* i?d545. u
* To change this template, choose Tools | Options and locate the template under 0 ;LF>+fJ
* the Source Creation and Management node. Right-click the template and choose XSof{:V
* Open. You can then make changes to the template in the Source Editor. xKBi".wA
*/ U*{0, Ue'
W2-l_{
package com.tot.count; Pi1LOCq
import java.util.*; G)YmaHeI;[
/** g]h@U&`~u_
* pvl];w
* @author OU` !c[O
*/ E8PwA.
public class CountCache { #*9 |\
public static LinkedList list=new LinkedList(); 'wFhfZB1!B
/** Creates a new instance of CountCache */ ?4 wl
public CountCache() {} ]6^S:K_"
public static void add(CountBean cb){ 4xT /8>v2|
if(cb!=null){ XBX`L"0
list.add(cb); /zh:7N
} Ie!">8."
} 4E=QO!pVv
} Chl^LEN:
!oi
{8X@
CountControl.java @VHstjos^V
VWt=9D;
/* |g \_xl
* CountThread.java \kV|S=~@
* U.Vn|s(`z
* Created on 2007年1月1日, 下午4:57 ?/T=Gk
* AXxyB"7A}
* To change this template, choose Tools | Options and locate the template under O0r vr$.
* the Source Creation and Management node. Right-click the template and choose )%p46(]
* Open. You can then make changes to the template in the Source Editor. f
uU"
*/ r2tE!gMC
j0oto6z~b
package com.tot.count; 8[,R4@
import tot.db.DBUtils; 9a@S^B>
import java.sql.*; ^PE|BCs
/** (qR;6l
* \;_tXb}F
* @author IDpLf*vSG
*/ @g`|ob]9
public class CountControl{ )(.g~Q:
private static long lastExecuteTime=0;//上次更新时间 {4SaSv^/
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 z^*g2J,
/** Creates a new instance of CountThread */ @N[<<k7g
public CountControl() {} P()n=&XO6
public synchronized void executeUpdate(){ sRBfLN2C
Connection conn=null; :{S@KsPqE
PreparedStatement ps=null; .K-d
try{ 7Q'u>o
conn = DBUtils.getConnection(); 1NZpd'$c
conn.setAutoCommit(false); =d@)*W 6
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); v; ewMiK@E
for(int i=0;i<CountCache.list.size();i++){ 5cM%PYU4:v
CountBean cb=(CountBean)CountCache.list.getFirst(); R)N^j'R~=
CountCache.list.removeFirst(); +-TEB
ps.setInt(1, cb.getCountId()); fUis_?!
ps.executeUpdate();⑴ ^wSGrV'
//ps.addBatch();⑵ 4_2oDcdf
} &)Zv>P8z`
//int [] counts = ps.executeBatch();⑶ jC:D>
conn.commit(); je#LD
}catch(Exception e){ dj9i*#F
e.printStackTrace(); ]X7_ji(l,
} finally{ QTF1~A\
try{ -f:PgBj
if(ps!=null) { GHLFn~z@XJ
ps.clearParameters(); sAA;d
ps.close(); $z)egh(z
ps=null;
!jEV75
} t]vv&vk>
}catch(SQLException e){} o*d (;
DBUtils.closeConnection(conn); +7lr#AvU/
} N|"q6M!ZL
} |FaK=e
public long getLast(){ j5n"LC+oz
return lastExecuteTime; )BaGY
} J^DyhCs
public void run(){ WFFd3TN%<
long now = System.currentTimeMillis(); :.BjJ2[S
if ((now - lastExecuteTime) > executeSep) { pE+:tMH;
//System.out.print("lastExecuteTime:"+lastExecuteTime); H,EZ%
Gl
//System.out.print(" now:"+now+"\n"); afaQb
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); UWqX}T[^
lastExecuteTime=now; qKeR}&b
executeUpdate(); D>U(&n
} DuAix)#FN9
else{ pnuwjU-
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); d'Dd66
} f2KH&j>~r
} l.;^w
} pFu!$.Fr
//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 JAMV@
wr:-n
类写好了,下面是在JSP中如下调用。 r-WX("Vvh
8In~qf
<% N`X|z
CountBean cb=new CountBean(); %/nDG9l
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); K'E)?NW69
CountCache.add(cb); EN}4-P/5
out.print(CountCache.list.size()+"<br>"); G:|]w,^i
CountControl c=new CountControl(); 8WQc8
c.run(); pfl^GgP#
out.print(CountCache.list.size()+"<br>"); /{[tU-}qJ
%>