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: > (9\ cF{
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CountBean.java ;0Pv49q
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/* J|].h
* CountData.java ?:ZB'G{%E
* HA*L*:0
* Created on 2007年1月1日, 下午4:44 P.qzP/Ny
* I{jvUYrKH
* To change this template, choose Tools | Options and locate the template under )9:5?,SO
* the Source Creation and Management node. Right-click the template and choose (v%24bv
* Open. You can then make changes to the template in the Source Editor. Q{RmE:
*/ H=Ilum06
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package com.tot.count; (Xcy/QT
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/** i5t6$|u:&m
* f+Sb>$
* @author -~|{q)!F
*/ c#sHnpP
public class CountBean { YT
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private String countType; &8z<~q
int countId; qQi\/~Y[:
/** Creates a new instance of CountData */ 6:O<k2=2
public CountBean() {} Iz5NA0[=2
public void setCountType(String countTypes){ _BmObXOp.
this.countType=countTypes; Ph1XI&us9
} =i&,I{3
public void setCountId(int countIds){ 'Vo8|?.WhX
this.countId=countIds; S k~"-HL|
} CMaph
public String getCountType(){ 52dD(
return countType; ylKK!vRHT
} v$W[(
public int getCountId(){ J6AHc"k.
return countId; `(sb
} R<Lf>p>_
} `daqzn
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CountCache.java ||_hET
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/* \ph.c*c
* CountCache.java u]};QR
* q8?kBKP
* Created on 2007年1月1日, 下午5:01 pW(rNAJ!
* BzP,Tu{,
* To change this template, choose Tools | Options and locate the template under 6t6Z&0$h~
* the Source Creation and Management node. Right-click the template and choose |4Q*4s
* Open. You can then make changes to the template in the Source Editor. 9)ALJd,M
*/ ds(?:zx#
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package com.tot.count; 6:]N%
import java.util.*; l9I r@.m
/** @#)` -]g
* "y,YC M`
* @author Xq*^6*E-}
*/ /Hyz]46
public class CountCache { ^Tm`motzh
public static LinkedList list=new LinkedList(); Ki\.w~Qs
/** Creates a new instance of CountCache */ 8Ojqm#/f
public CountCache() {} K>@yk9)vi
public static void add(CountBean cb){ HU i?\4
if(cb!=null){ #]kjyT0
list.add(cb); ttzNv>L,
} 6<._^hyq
} "6$V1B0KW
} a>'ez0C
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CountControl.java hj [77EEz
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/* l@4_D;b3o"
* CountThread.java //q(v,D%Q
* ;Y$>WKsV
* Created on 2007年1月1日, 下午4:57 &12KpEyf
* B7C3r9wj
* To change this template, choose Tools | Options and locate the template under amu;grH
* the Source Creation and Management node. Right-click the template and choose qN)y-N.LI(
* Open. You can then make changes to the template in the Source Editor. ~#A}=,4>
*/ +jGHR&A t
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package com.tot.count; %9J@##+
import tot.db.DBUtils; {ALEK
import java.sql.*; nqcq3o*B
/** W)In.?>]W
* Ke\\B o,
* @author AK2Gm-hHK
*/ 6pt_cpbR
public class CountControl{ L*(9Hti
private static long lastExecuteTime=0;//上次更新时间 p,Ff,FfH
private static long executeSep=60000;//定义更新间隔时间,单位毫秒
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/** Creates a new instance of CountThread */ z8Q!~NN-K
public CountControl() {} *qd:f!Q3
public synchronized void executeUpdate(){ <'a~ Y3B"o
Connection conn=null; 0
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PreparedStatement ps=null; Ts5)r(
try{ \G" S7
conn = DBUtils.getConnection(); M&Ka^h;N
conn.setAutoCommit(false); LVj1NP
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 2$JGhgDI
for(int i=0;i<CountCache.list.size();i++){ eqo0{e
CountBean cb=(CountBean)CountCache.list.getFirst(); !eLj +0
CountCache.list.removeFirst(); ti\
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ps.setInt(1, cb.getCountId()); 1 em,/>"
ps.executeUpdate();⑴ za>UE,?h
//ps.addBatch();⑵ t]yxLl\
} OXEk{#Uf[3
//int [] counts = ps.executeBatch();⑶ Z2% HQL2
conn.commit(); L"bOc'GfQ
}catch(Exception e){ liKlc]oM
e.printStackTrace(); =q4}(
} finally{ rFRcK>X\L
try{ Kc MzY
if(ps!=null) { 9u B?-.
ps.clearParameters(); 25Dl4<-Z
ps.close(); F "@% 7xy
ps=null; x84!/n^z
} rhJ&* 0M
}catch(SQLException e){} e~o!Qm
DBUtils.closeConnection(conn); AjC:E+g
} :t}\%%EbmE
} b\k]Jx
public long getLast(){ h)KHc/S
return lastExecuteTime; jEc_!Q
} YG "Ta|@5
public void run(){ L:R4&|E/t
long now = System.currentTimeMillis(); {f/qI`
if ((now - lastExecuteTime) > executeSep) { f-ltV<C_
//System.out.print("lastExecuteTime:"+lastExecuteTime); *c0H_8e
//System.out.print(" now:"+now+"\n"); @T'^V0!-q:
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); t un}rdb
lastExecuteTime=now; Ot=jwvw
executeUpdate(); #@XBHJD\#
} dGIdSQ~ _
else{ Rn1oD3w
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); .Ro/ioq
} '%N?r,x
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} b+rxin".
} ,T/Gv;wa2
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 D -}>28
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类写好了,下面是在JSP中如下调用。 <Vat@e
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<% [BWq9uE
CountBean cb=new CountBean(); 54
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]%\,.&=hT
CountCache.add(cb); +>ju,;4WK
out.print(CountCache.list.size()+"<br>"); fqNh\~kja
CountControl c=new CountControl(); [GwAm>k
c.run(); -9Q(3$}
out.print(CountCache.list.size()+"<br>"); Lkt4F
%>