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: 4QHS{tj
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CountBean.java e}yX_Z'P<
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/* g);^NAA
* CountData.java 0?DC00O
* EbY,N:LK
* Created on 2007年1月1日, 下午4:44 'gMfN
* ,&^3Z
* To change this template, choose Tools | Options and locate the template under ,)FdRRj
* the Source Creation and Management node. Right-click the template and choose 5F"|E-;
* Open. You can then make changes to the template in the Source Editor. B4Y(?JTx
*/ #*%q'gyHT
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package com.tot.count; Nw_@A8-r
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/**
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* +IFw_3$
* @author /=?x{(B>
*/ #Pk$L+C
public class CountBean { YDJ4c;37
private String countType; i[jJafAcN
int countId; XXZaKgsq
/** Creates a new instance of CountData */ U(>4s]O6
public CountBean() {} <Zb/
public void setCountType(String countTypes){ H}}$V7]^),
this.countType=countTypes; *e>]~Z,
} oqd;6[%G
public void setCountId(int countIds){ _qwQ;!9
this.countId=countIds; YwEpy(}hJm
} %ysZ5:X
public String getCountType(){ yay<GP?
return countType; YZf6|
} o{qr!*_3
public int getCountId(){ [Nm4sI11
return countId; n/d`qS
} "/Pjjb:2
} 2B0W~x2=
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CountCache.java
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/* {Azn&|%.t
* CountCache.java 9pn>-1NJ
* v X~RP
*
* Created on 2007年1月1日, 下午5:01 $ ,Ck70_
* 1Na@|yY
* To change this template, choose Tools | Options and locate the template under ^2D1`,|N
* the Source Creation and Management node. Right-click the template and choose 6fo3:P*O
* Open. You can then make changes to the template in the Source Editor. K)tQ]P
*/ /*FH:T<V
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package com.tot.count; 2&mGT&HAVA
import java.util.*; 6RO(]5wX
/** x&sI=5l
* S{t +>/
* @author IY'=DePd
*/ `>Tu|3%\
public class CountCache { f"G-
public static LinkedList list=new LinkedList(); CvSIV7zYo
/** Creates a new instance of CountCache */ ?Ea;J0V
public CountCache() {} 5zJj]A
public static void add(CountBean cb){ ^FmU_Q0
if(cb!=null){ "Mw[P [w*
list.add(cb); 7"F*u :
} Ks^6.)
} ?lGG|9J\
} H(c72]@Vg
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CountControl.java ~)LH='|h\}
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/* bK"SKV
* CountThread.java 1d"Z>k:mn
* XgN` 7!Z
* Created on 2007年1月1日, 下午4:57 zLs|tJOVp
* RoA?p;]<
* To change this template, choose Tools | Options and locate the template under xJ^>pg8
* the Source Creation and Management node. Right-click the template and choose x9/H/'
* Open. You can then make changes to the template in the Source Editor. TNCgaTJ{h
*/ d<!3`qe
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package com.tot.count; ptatzp]c#
import tot.db.DBUtils; 5Wyz=+?m|
import java.sql.*; 6vuq1
/** [Aj Q#;#Q
* jUv!9Y}F
* @author Ee)[\Qjn
*/ =L%DX#8
public class CountControl{ kIw`P[
private static long lastExecuteTime=0;//上次更新时间 )[H{yQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Wt)Drv{@ {
/** Creates a new instance of CountThread */ ;AR{@Fu.
public CountControl() {} ~\ ,w {
public synchronized void executeUpdate(){ fbyQjvURnC
Connection conn=null; F|Mi{5G%
PreparedStatement ps=null; ZUz ^!d
try{ Re:jVJgBz
conn = DBUtils.getConnection(); bmN q[}
conn.setAutoCommit(false); 7{e{9QbJ4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); H gTUy[(
for(int i=0;i<CountCache.list.size();i++){ 3!Sp0P
CountBean cb=(CountBean)CountCache.list.getFirst(); :q8b;*:
CountCache.list.removeFirst(); 3czeTj
ps.setInt(1, cb.getCountId()); UNijFGi
ps.executeUpdate();⑴ =PRx?q`d
//ps.addBatch();⑵ S)QAXjH
} /,!qFt
//int [] counts = ps.executeBatch();⑶ pi=-#g(2
conn.commit(); Vd".u'r
}catch(Exception e){ ]{"Br$
e.printStackTrace(); LmlXMia
} finally{ E$W{8?:{
try{ w%WF-:u7|
if(ps!=null) { }X x(^Zh
ps.clearParameters(); kKD`rfyG\
ps.close(); #-pc}Y|<
ps=null; 7g
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} 4&8Gr0C
}catch(SQLException e){} P\8@g U!uk
DBUtils.closeConnection(conn); 1h6^>()^
} 6x"Q
} D:k3"
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public long getLast(){ `D9]*c
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return lastExecuteTime; :4~g;2oag
} <;E
public void run(){ `_b`kzJ
long now = System.currentTimeMillis(); hN['7:bQ
if ((now - lastExecuteTime) > executeSep) { 3qY K_M^[
//System.out.print("lastExecuteTime:"+lastExecuteTime); V"p!Bf
//System.out.print(" now:"+now+"\n"); 1;Pv0&[q/
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); >zDF2Y[
lastExecuteTime=now; qB)"qFa
executeUpdate(); DI!V^M[~u
} Gpm{m:$L
else{ q o<&J f
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); jp $Z]
} 763+uFx^
} &/Ro lIHF
} K3\#E/Ox
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 gp$Ucfu'
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类写好了,下面是在JSP中如下调用。 !61Pl/uQ
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<% ?Ma~^0
CountBean cb=new CountBean(); |_omr&[_
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); D;UV&.$'v
CountCache.add(cb); hp{OL< 2M
out.print(CountCache.list.size()+"<br>"); ^Rx9w!pAN
CountControl c=new CountControl(); Vi4~`;|&b+
c.run(); kId
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out.print(CountCache.list.size()+"<br>"); A
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