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: Ku\Y'ub
usEwm,b)
CountBean.java ]%BWIqbr
dxZu2&gi
/* Ix(?fO#uNF
* CountData.java Gm9hYhC8
* ?[)}l9
* Created on 2007年1月1日, 下午4:44 x~GQV^(l3
* {"&SJt[%X
* To change this template, choose Tools | Options and locate the template under /1x,h"T\<
* the Source Creation and Management node. Right-click the template and choose x9x E&
* Open. You can then make changes to the template in the Source Editor. ZO4*sIw%
*/ 5aln>1x>hn
tZ `z
package com.tot.count; _~q?_'kx
v^ zu:Z*
/** oP!;\a( SL
* -O&CI)`;B
* @author E2cB U{x
*/ oS7(s
public class CountBean { \3'9Uz,OC
private String countType; aX~%5mF
int countId; AX= 1b,s
/** Creates a new instance of CountData */ Wx~k&[&E
public CountBean() {} <{2e#Y
public void setCountType(String countTypes){ !-N6l6N
this.countType=countTypes; X6 6VU
} ]da^xWK
public void setCountId(int countIds){ 34wkzu
this.countId=countIds; MXzVgy
} uu}x@T@
public String getCountType(){ '=1KVE^Fk
return countType; [@Q_(LQ-U
} -
/(s#D
public int getCountId(){ /v/C<]
return countId; -T&.kYqnb$
} e.@uhB.
} `.T}=j|
8}fu,$$5
CountCache.java 05snuNt]-
Ux#x#N
/* Qt,M!i,
* CountCache.java `ORECg)
* e"'#\tSG
* Created on 2007年1月1日, 下午5:01 zGc:
@z
* + +aL4:
* To change this template, choose Tools | Options and locate the template under )u/H>;L P
* the Source Creation and Management node. Right-click the template and choose NvHJ3> "%
* Open. You can then make changes to the template in the Source Editor.
BWrv%7
*/ !2z?YZhu
4<cz--g
package com.tot.count; \mw(cM#:
import java.util.*; -0_d/'d
/** $uap8nN
* 5*E#*H
* @author 63.wL0~
*/ c\ia6[3sX
public class CountCache { .[Ap=UYI>
public static LinkedList list=new LinkedList(); +=]!P#
/** Creates a new instance of CountCache */ @FC"nM
public CountCache() {} ' j6gG
public static void add(CountBean cb){ 9elga"4:'
if(cb!=null){ OKi\zS
list.add(cb); vTaJqEE
} u~3%bJ]
} vk>b#%1{
} l#lF
+Q;
&q`q4g&7
CountControl.java A8q;q 2
2MATpV#BT
/* 0]D{Va
* CountThread.java bJYda)
* P ~#>H{
* Created on 2007年1月1日, 下午4:57 w,O,W[C
* sTOa
* To change this template, choose Tools | Options and locate the template under Qb!PRCHQ
* the Source Creation and Management node. Right-click the template and choose N<QjdD&
* Open. You can then make changes to the template in the Source Editor. DhX#E&
*/ ,o^y`l
P\]B<
package com.tot.count; 70lfb`
import tot.db.DBUtils; U,+[5sbo
import java.sql.*; P
i Fm|
/** Fbu5PWhlc
* `Pw*_2
* @author `60gFVu
*/ 4;HJ;0-ps
public class CountControl{ MwfOy@|N
private static long lastExecuteTime=0;//上次更新时间 '{[5M!B
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 gJ;_$`
/** Creates a new instance of CountThread */ L:(1ZS
public CountControl() {} Yp0/Ab(v
public synchronized void executeUpdate(){ %0 #XPc("
Connection conn=null; r?CI)Y;
PreparedStatement ps=null; McoK@q;
try{ ~GuMlV8
conn = DBUtils.getConnection(); P_c,BlfGMH
conn.setAutoCommit(false); oW^*l#v
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 7},)]da>,'
for(int i=0;i<CountCache.list.size();i++){ .TE?KI
CountBean cb=(CountBean)CountCache.list.getFirst(); R/^u/~<
CountCache.list.removeFirst(); `+t.!tv!
ps.setInt(1, cb.getCountId()); l~D N1z6`
ps.executeUpdate();⑴ Y=`
//ps.addBatch();⑵ it>r+%
} I+ es8
//int [] counts = ps.executeBatch();⑶ xr7+$:>a
conn.commit(); <" @zn
}catch(Exception e){ vsL[*OeI
e.printStackTrace(); ?88`fJ@tk?
} finally{ 0<PR+Iv*i
try{ }<z_Q_b+e
if(ps!=null) { q %0Cg=
ps.clearParameters(); hky;CD~$
ps.close(); O$kq`'9
ps=null; peJKNX.!q
} LTJc,3\,
}catch(SQLException e){} goJ|oi
DBUtils.closeConnection(conn); DAg58
=qJ
} -k(CJ5H9
} sz--27es
public long getLast(){ ^'p|!`:
return lastExecuteTime; A~Xq,BxCV
} zZiJ 9 e
public void run(){ 15$4&=O
long now = System.currentTimeMillis(); P/JK $nb
if ((now - lastExecuteTime) > executeSep) { l88A=iLgv
//System.out.print("lastExecuteTime:"+lastExecuteTime); *jMk/9oa<N
//System.out.print(" now:"+now+"\n"); D0mI09=GtQ
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); v`V7OD#:j]
lastExecuteTime=now; 9S[XTU
executeUpdate(); >a1{397Y}
} ;.wX@
else{ n6(i`{i
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n");
/%A;mlf{
} M(d6Z2ibh
} '!P"xBVAu
} YUQtMf9
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 mR8W]'gl.L
N$TL;T>
类写好了,下面是在JSP中如下调用。 ;pD)m/$h`
q!f1~ aG
<% q>s-Y|
CountBean cb=new CountBean(); 4wi(?
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); w[_x(Ojq;
CountCache.add(cb); =SD\Q!fA
out.print(CountCache.list.size()+"<br>"); y fSM
CountControl c=new CountControl(); WZ!WxX>zO
c.run();
-
O"i3>C
out.print(CountCache.list.size()+"<br>"); ]O{u tm
%>