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: xtnB:3
?L
$KlF Y
CountBean.java ,yT4(cMBk?
Twk zX|
/* *oPSkEA{
* CountData.java }I;W
* ewLr+8
* Created on 2007年1月1日, 下午4:44 V?gQ`( ,
* [ wROIvV
* To change this template, choose Tools | Options and locate the template under $M8'm1R9
* the Source Creation and Management node. Right-click the template and choose PM|K*,3J
* Open. You can then make changes to the template in the Source Editor. aR\=p:%jGI
*/ ;js7rt
} 6KL
package com.tot.count; IS!+J.2
z~W@`'f
/** v3/cNd3
* N8vWwN[3
* @author 8O7JuR
*/ yJrPb"
public class CountBean { $W2g2[+
private String countType; JrQN-e!
int countId; x|Ei_hI-
/** Creates a new instance of CountData */ v|"{x&I.
public CountBean() {} =:2V4H(F
public void setCountType(String countTypes){ 3)xV-Y9
this.countType=countTypes; -{w&ya4X
} k-89(
public void setCountId(int countIds){ Uarb
[4OZ
this.countId=countIds; WFB2 Ub7
} *0iP*j/]
public String getCountType(){ qV}zV\Nz
return countType; _3E7|drIX
} $""[(
d?0
public int getCountId(){ _A,m@BCz
return countId; YF"D;.
} *<UQ/)\
} A ssf
f;
|hpm|eZG"h
CountCache.java NBeGmC|
Qj=l OhM
/* R_*\?^k|A
* CountCache.java hsl8@=_ B
* _
9k^Hd[L$
* Created on 2007年1月1日, 下午5:01 W$3p,VTMmB
* ?T^$,1-
* To change this template, choose Tools | Options and locate the template under 1"'//0
7
* the Source Creation and Management node. Right-click the template and choose $v^F>*I1
* Open. You can then make changes to the template in the Source Editor. D( _aXy
*/ "qF&%r'
^fx9R5E$:
package com.tot.count; e88JT_zrO
import java.util.*; /M#A[tZ3
/** '*T7tl
* z><JbSE?
* @author E u@TCw8@
*/ >GjaA1,
public class CountCache { FVSz[n
public static LinkedList list=new LinkedList(); 8Yj(/S3y
/** Creates a new instance of CountCache */ <Ei|:m
public CountCache() {} We9mkwK7C
public static void add(CountBean cb){ fEpY3od
if(cb!=null){ ja:%j&:
list.add(cb); 1{,WY(,c
} o`#;[
} [Ea5Bn;~!
} 8@r+)2
?>,aq>2O$
CountControl.java fb#Ob0H
{
~Cqb7
/* jem$R/4"
* CountThread.java bc&:v$EGy
* P2oRC3~
* Created on 2007年1月1日, 下午4:57 n,0}K+}
* 0zEn`rq&
* To change this template, choose Tools | Options and locate the template under ou(9Qf zN
* the Source Creation and Management node. Right-click the template and choose R~tv?hP
* Open. You can then make changes to the template in the Source Editor. UyJ5}fBJ
*/ jR48.W
_2TIan}
package com.tot.count; ZSbD4
|_
import tot.db.DBUtils; 2L,e\]2Z
import java.sql.*; 0h; -Yg
/** 7?A}qmv
* <}UqtDF 0
* @author NZD
X93
*/ [pOU!9v4
public class CountControl{ 1di?@F2f
private static long lastExecuteTime=0;//上次更新时间 }vm17`Gfy
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 nmgW>U0jZh
/** Creates a new instance of CountThread */ YZoH{p9f
public CountControl() {} FV^kOz
public synchronized void executeUpdate(){
e%qMrR
Connection conn=null; doe[f_\
PreparedStatement ps=null; ufm#H#n)#X
try{ ;%%=G;b9
conn = DBUtils.getConnection(); 8RocObY_W
conn.setAutoCommit(false); !|`YNsR
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =GLsoc-b
for(int i=0;i<CountCache.list.size();i++){
@P~u k
CountBean cb=(CountBean)CountCache.list.getFirst(); S>'wb{jj!
CountCache.list.removeFirst(); qV(Plt%
ps.setInt(1, cb.getCountId()); 3rWqt
ps.executeUpdate();⑴ -m__I U
//ps.addBatch();⑵ }XAoMp
} ^ i\zMMR
//int [] counts = ps.executeBatch();⑶ sd=i!r)ya
conn.commit(); gz$=\=%>RL
}catch(Exception e){ yP"_j&ef7
e.printStackTrace(); is`a_{5e=
} finally{ ?$o8=h
try{ Jw86P=
if(ps!=null) { Nl(Aa5:!
ps.clearParameters(); c
shZR(b
ps.close(); l,d8%\
ps=null; 7g=Ze~aq
} on(W^ocnD
}catch(SQLException e){} a1GyI
DBUtils.closeConnection(conn); G&;W
} eR3!P8t
} 0">#h
public long getLast(){ TM"i9a? ;
return lastExecuteTime; MLp5Y\8*
} CE?R/uNo{
public void run(){ [,fMh $t
long now = System.currentTimeMillis(); "PlM{ZI\
if ((now - lastExecuteTime) > executeSep) { 2
{31"
//System.out.print("lastExecuteTime:"+lastExecuteTime); QGsUG_/_P
//System.out.print(" now:"+now+"\n"); CwT52+Jb
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {UwJg
lastExecuteTime=now; s~TYzfA
executeUpdate(); KR z\ct|
} i1sc oxX3\
else{ O,DA{> *m
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 6bU/IVP
} *FqNzly
} yJgnw6>r2
} ^91k@MC
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 L6',s4
1*=[%
d7
类写好了,下面是在JSP中如下调用。 Q}1PPi,
]zD/W%c
<% <;acWT?(
CountBean cb=new CountBean(); 2Gx&ECa,
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); WLizgVM
CountCache.add(cb); 4S9AXE6
out.print(CountCache.list.size()+"<br>"); ]5}
=r
CountControl c=new CountControl(); txliZ|.O
c.run(); TpnkJygIm
out.print(CountCache.list.size()+"<br>"); T$k) ^'
%>