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: iP1yy5T
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CountBean.java 6y"T;.FAo
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/* U8</aQLGF
* CountData.java
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* RcZ&/MY
* Created on 2007年1月1日, 下午4:44 vYq"W%
* kovJ9
* To change this template, choose Tools | Options and locate the template under pIKfTkSqH
* the Source Creation and Management node. Right-click the template and choose E
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* Open. You can then make changes to the template in the Source Editor. >4Qj+ou
*/ Nk1p)V SC
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package com.tot.count; N(O*"1b
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/** y(Em+YTD
* 6=*n$l#}
* @author c_aj-`BKp
*/ kZR(0,
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public class CountBean { dl6Ju
private String countType; "Id1H
int countId; q2;CvoF
/** Creates a new instance of CountData */ `1#Z9&bO
public CountBean() {} K?yMy,9%Yw
public void setCountType(String countTypes){ R?Ch8mW.!
this.countType=countTypes; aPX'CG4m
} ]H<}6}Gd
public void setCountId(int countIds){ V|/N-3M
this.countId=countIds; ?.c:k;j
} 6w_TL<S
public String getCountType(){ |;"(C# B
return countType; ?uW}
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} Cn_r?1{W
public int getCountId(){ Oe;1f#`5
return countId; Fz5eCe\B
} Ci2*5n<
} lbh7`xCR
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CountCache.java d^0-|sx
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/* |\)Y,~;P
* CountCache.java a|k*A&5u2
* u_b6u@r7
* Created on 2007年1月1日, 下午5:01 JZE<oQ_Jm
* gj&5>brP
* To change this template, choose Tools | Options and locate the template under +;bZ(_ohG
* the Source Creation and Management node. Right-click the template and choose :*cd$s
* Open. You can then make changes to the template in the Source Editor. 6t'.4SR
*/
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package com.tot.count; Dw,LB>Eq,
import java.util.*; -oY8]HrXfK
/** o<5+v^mt#
* 'L^M"f^I
* @author f{|n/j;n=C
*/ 'vKae
public class CountCache { V}JBv$+ko
public static LinkedList list=new LinkedList(); TeyFq0j@'
/** Creates a new instance of CountCache */ l vBcEg
public CountCache() {} {5+ 39=(
public static void add(CountBean cb){ Vygh|UEo
if(cb!=null){ Gc;-zq
list.add(cb); GKG:iR)
} zXxA"
} Ym$`EN
} "S>VqvH3
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CountControl.java V=Z%y$1Bc
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/* ^__P;Gr`
* CountThread.java H)rJ>L
* :]LW,Eql
* Created on 2007年1月1日, 下午4:57 ojVN-*5
* Ij9=J1c4
* To change this template, choose Tools | Options and locate the template under v7D0E[)~
* the Source Creation and Management node. Right-click the template and choose J@J`)
* Open. You can then make changes to the template in the Source Editor. }Q-Tw,j
*/ |:`)sx3@#
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package com.tot.count; C%/@U[;
import tot.db.DBUtils; V3/OKI\o
import java.sql.*; 7}(YCZny5
/** 9MbF:
* CM t$)
* @author @k/|%%uP
*/ -tp3qi
public class CountControl{ T7 (d
private static long lastExecuteTime=0;//上次更新时间 "i!W(}x+
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 C\ 34R
/** Creates a new instance of CountThread */ 'yh)6mid
public CountControl() {} +u
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public synchronized void executeUpdate(){ %iZ~RTY6 !
Connection conn=null; cq/@ng*o
PreparedStatement ps=null; R0F&!y!B
try{ o ,8;=f,7
conn = DBUtils.getConnection(); Ia:M+20n
conn.setAutoCommit(false); q~{O^,4S
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); iZ(JwY
for(int i=0;i<CountCache.list.size();i++){
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CountBean cb=(CountBean)CountCache.list.getFirst(); 59V8cO+qH
CountCache.list.removeFirst(); $M1;d1e6'
ps.setInt(1, cb.getCountId()); ifmX<'(9A
ps.executeUpdate();⑴ G%CS1#
//ps.addBatch();⑵ dX-j3lM:#
} ;U? 323Z
//int [] counts = ps.executeBatch();⑶ rgEN~e'
conn.commit(); -JclEp
}catch(Exception e){ uY3?(f#
e.printStackTrace(); sjHcq5#U!
} finally{ Q0L1!}w
try{ UAC"jy1D
if(ps!=null) { I1p{(fJ
ps.clearParameters(); raM{!T:
ps.close(); )1<GSr9
ps=null; oYWHO<b
} Io('kCOR;
}catch(SQLException e){} 41+@!`z7
DBUtils.closeConnection(conn); #zc$cr
} i1Y<[s
} l?HC-_Pbh
public long getLast(){ )0=H)k0
return lastExecuteTime; QjTs$#eMW
} f2ck=3
public void run(){ V7k!;0u
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long now = System.currentTimeMillis(); ^j1iCL!
if ((now - lastExecuteTime) > executeSep) { !z5Ozm+}
//System.out.print("lastExecuteTime:"+lastExecuteTime); 5 &]a8p{
//System.out.print(" now:"+now+"\n"); $-39O3
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
$;)A:*e
lastExecuteTime=now; p)~EG=p
executeUpdate(); 98CS|NEe
} u>V~:q\X
else{ NHhKEx0Gtu
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); `L3{y/U'
} 5+/XO>P1m|
} 0 R>!jw
} IkQ,#Bsb[
//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 '.I0n
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类写好了,下面是在JSP中如下调用。 W}WDj:
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<% M4t:)!dji?
CountBean cb=new CountBean(); E/ ^N
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); F 2Mxcs*M
CountCache.add(cb); k%;oc$0G-3
out.print(CountCache.list.size()+"<br>"); ~@"H\):/
CountControl c=new CountControl(); uFfk!
c.run(); w|-m*v
.
out.print(CountCache.list.size()+"<br>"); @
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