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: 8!&ds~?
^aD/ .
CountBean.java y\|-O<8O
lNA'M&
/* 3<jAp#bE
* CountData.java 1fO2)$Y
* fUp|3bBE
* Created on 2007年1月1日, 下午4:44 }/7.+yD
* mHI4wS>()+
* To change this template, choose Tools | Options and locate the template under
D?\"
* the Source Creation and Management node. Right-click the template and choose @\6nXf
* Open. You can then make changes to the template in the Source Editor. %7C%`)T]
*/ e}?1T7NPG]
s`Be#v
package com.tot.count; a_ 9 |xI
6_9:Eb=^v!
/** J/]o WC`u
*
CSG+bqUG
* @author 9N*S-Po=
*/ >p]WCb'PH
public class CountBean { 5Aa31"43n
private String countType; `uNvFlP
int countId; *3.yumcv{L
/** Creates a new instance of CountData */ I!F}`d
public CountBean() {} 1C}pv{0:&
public void setCountType(String countTypes){ A"\P&kqMV
this.countType=countTypes; EDq$vB
} tyn?o
public void setCountId(int countIds){ EU^}NZW&v:
this.countId=countIds; cwM#X;FGq
} J3lG"Ww
public String getCountType(){ iL7-4Lv#
return countType; F=
_uNq
} Cz=A{<^g
public int getCountId(){ |c06ix;).
return countId; {FV,j.D
} vB{;N
} VVI8)h8
'B:Z=0{>N
CountCache.java $,; ;u:-
a%MzNH
/* @O}IrC!bf
* CountCache.java ]HJ{dcF
* vDK:v$g
* Created on 2007年1月1日, 下午5:01 S{^6iR
* 0$xK
* To change this template, choose Tools | Options and locate the template under Xb(CH#*{z
* the Source Creation and Management node. Right-click the template and choose w&wA >q>&
* Open. You can then make changes to the template in the Source Editor. q9>Ls-k
*/ b!4N)t>gl
2d5}`>
package com.tot.count; #sz]PZ\
import java.util.*; ?$30NK3G
/** bk\dy7
* 54ak<&?
* @author r3+<r<gs
*/ aW`:)y&f
public class CountCache { *}
*!+C3
public static LinkedList list=new LinkedList(); QQ^Gd8nQ
/** Creates a new instance of CountCache */ T@K7DkP@
public CountCache() {} w|!YoMk+o
public static void add(CountBean cb){ ^f^-.X
if(cb!=null){ KAj"p9hq+k
list.add(cb); _Hz~HoNU
} iwG>]:K3
} F:[7^GQZ{
} ou<S)_|Iu
N`,7 FI}
CountControl.java HZQDe&
Hk<X
/* Tm%$J
* CountThread.java fs2mN1
* XPHQAo[(s
* Created on 2007年1月1日, 下午4:57 r.^0!(d
* 7>nhIp))
* To change this template, choose Tools | Options and locate the template under +8LM~voB
* the Source Creation and Management node. Right-click the template and choose ,~?A,9?%:
* Open. You can then make changes to the template in the Source Editor. J-t=1
*/ eVqM=%Q
io1S9a(y
package com.tot.count; l 8O"w&
import tot.db.DBUtils; :3111}>c
import java.sql.*; -kG3k> by_
/** h|J;6Sm@
* ]4Nvh\/P9
* @author ?8Hn{3X
*/ /_NkB$&
public class CountControl{ fkdf~Vb
private static long lastExecuteTime=0;//上次更新时间 BKa A=Bl
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -vyIOH,
/** Creates a new instance of CountThread */ G*kE~s9R
public CountControl() {} 07.nq;/R
public synchronized void executeUpdate(){ 6@"Vqm|HD
Connection conn=null; @IEI%vH
PreparedStatement ps=null; o\_
Td
try{ X4d Xm>*?=
conn = DBUtils.getConnection(); gbY LA a
conn.setAutoCommit(false); W0VA'W
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); D3<IuWeM
for(int i=0;i<CountCache.list.size();i++){ >}ro[x`K
CountBean cb=(CountBean)CountCache.list.getFirst(); <T(s\N5B=
CountCache.list.removeFirst(); =}~NRmmF
ps.setInt(1, cb.getCountId()); 3x04JE3!
ps.executeUpdate();⑴ [:AB$l*
//ps.addBatch();⑵ 5Z*
b(R
} |$YyjYK
//int [] counts = ps.executeBatch();⑶ m(2G*}
conn.commit(); \w{@u)h
}catch(Exception e){ fUb1/-}
e.printStackTrace(); ,]0S4h67
} finally{ JaH*
rDs-
try{ l_^T&xq8
if(ps!=null) { oUl=l}qnD
ps.clearParameters(); Kg4QT/0VA
ps.close(); ]WTf< W<
ps=null; hNH.G(l0
} x7vq?fP0n
}catch(SQLException e){} XxmJP5
DBUtils.closeConnection(conn); "nVK< V d
} aXRv}WO$>k
} +n@f'a">
public long getLast(){ /)sDnJ1r
return lastExecuteTime; *
eA{[
} zl0;84:H
public void run(){ t[%x}0FP-F
long now = System.currentTimeMillis(); zx
ct(
if ((now - lastExecuteTime) > executeSep) { q]F4Lq(
//System.out.print("lastExecuteTime:"+lastExecuteTime); EYA/CI
//System.out.print(" now:"+now+"\n"); x$~3$E
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); U'rr?,RML
lastExecuteTime=now; A|2 <A
!
executeUpdate(); IeO-O'^&`
} =Nw2;TkB[
else{ _GE=kw;:
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); #]?tY}~
} ^Y$QR]
} >NJjS8f5
} 2K3MAd{
//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 EY
So=
BTOA &Ag
类写好了,下面是在JSP中如下调用。 0Xp
nbB~~I
uK"^*NEC';
<% - oU@D
CountBean cb=new CountBean(); Ynvj;
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); | @uq()
CountCache.add(cb); DYc.to-
out.print(CountCache.list.size()+"<br>"); 9~=gwP
CountControl c=new CountControl(); 4S'[\ZJO
c.run(); E3y6c)<
out.print(CountCache.list.size()+"<br>"); U?^OD
%>