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: y)`q% J&
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CountBean.java &$pA,Gjin\
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/* `$r?^|T
* CountData.java ,Q8h#0z r
* /^[K
* Created on 2007年1月1日, 下午4:44 fR lJ`\ t
* i,$n4
* To change this template, choose Tools | Options and locate the template under ?? Dv\yLZI
* the Source Creation and Management node. Right-click the template and choose Ozc9y y!%
* Open. You can then make changes to the template in the Source Editor. ze#ncnMo
*/ GF*E+/
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package com.tot.count; 7+J<N@.d
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/** MAG/7T5
* UeSPwY
* @author bzX/Zts
*/ elb}]
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public class CountBean { S!~p/bB[+I
private String countType; 5{M$m&$1
int countId; bg,VK1
/** Creates a new instance of CountData */ l8N5}!N
public CountBean() {} x>[ gShAV!
public void setCountType(String countTypes){ 9CHn6 v ~)
this.countType=countTypes; P6 mDwR
}
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public void setCountId(int countIds){ G)7J$4R
this.countId=countIds; 2}#VB;B
} -"n8Wv
public String getCountType(){ yTU'voE.|
return countType; SQf.R%cg$
} -.7UpDg~
public int getCountId(){ [N*`3UZk"
return countId; ~fly6j|u
} ltmD=-]G_
} cN#f$
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CountCache.java [AAIBb+U
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/* #0/^v*
* CountCache.java .+ CMm5T
* >tV:QP]Y
* Created on 2007年1月1日, 下午5:01 VI^~I;M^
* -<q@0IYyi
* To change this template, choose Tools | Options and locate the template under =&;}#A%m
* the Source Creation and Management node. Right-click the template and choose {Gr"oO`&"
* Open. You can then make changes to the template in the Source Editor. V?z-Dt C
*/ )yv~wi
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package com.tot.count; z_9qT"vF
import java.util.*; qyYf&VC}
/** {:BY
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* 4 !M6RL8{
* @author F}_Zh9/$(
*/ 8HH\wu$$e
public class CountCache { \AB*C_Ri
public static LinkedList list=new LinkedList(); ;Q%3WD
/** Creates a new instance of CountCache */ I6F $@
public CountCache() {} e\i}@]
public static void add(CountBean cb){ (`K~p Z
if(cb!=null){ U\", !S~<
list.add(cb); w'!J
} =zKbvwe%X
} F[U0TP@&*
} 29h_oNO
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CountControl.java [IW6F
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/* }zV#?;}
* CountThread.java VufG7%S{
* .[X"+i\
* Created on 2007年1月1日, 下午4:57 ou'|e "tI
* 4 {3<
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* To change this template, choose Tools | Options and locate the template under -*&C "%e
* the Source Creation and Management node. Right-click the template and choose Qx !!
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* Open. You can then make changes to the template in the Source Editor. -;o`(3wZq
*/ b'yW+
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package com.tot.count; .aqP=
import tot.db.DBUtils; u&ozc
import java.sql.*; 2HJGp+H
/** 0i9C\'W`
* 7)+%;|~
* @author }WG -R
*/ z`rW2UO#a`
public class CountControl{ Pr^p
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private static long lastExecuteTime=0;//上次更新时间 3+#
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 p4{3H+y
/** Creates a new instance of CountThread */ .FAuM~_99b
public CountControl() {} 6dX l ny1H
public synchronized void executeUpdate(){ >d#6qXKAU
Connection conn=null; } T<oLvS
PreparedStatement ps=null; pNR69/wGi
try{ "J6aU
conn = DBUtils.getConnection(); "t)|N
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conn.setAutoCommit(false); FUU/=)^P$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J*CfG;Y:
for(int i=0;i<CountCache.list.size();i++){ 5mYI5~
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CountBean cb=(CountBean)CountCache.list.getFirst(); wa4(tM2
CountCache.list.removeFirst(); Qz?r4kR
ps.setInt(1, cb.getCountId()); 4 '-GcH
ps.executeUpdate();⑴ VNLggeX'U
//ps.addBatch();⑵ s_ N]$3'[E
} h ^6Yjy
//int [] counts = ps.executeBatch();⑶ 2VNfnk
conn.commit(); 66~]7w
}catch(Exception e){ Dhe ]f#d
e.printStackTrace(); Lg4I6 G
} finally{ BHBMMjY5
try{ *]_GFixi
if(ps!=null) { 9ApGn!`
ps.clearParameters(); E$84c+
ps.close(); C]+T5W\"<B
ps=null; yD9<-B<)
} P&@[ j0
}catch(SQLException e){} ewcgg
DBUtils.closeConnection(conn); kaj6C_k|
} x2gP, p-
} a0ze7F<(
public long getLast(){ ~_Mz05J-\_
return lastExecuteTime; :-kXZe
} IW'2+EGc
public void run(){ f@a@R$y
long now = System.currentTimeMillis(); iy_\1jB0
if ((now - lastExecuteTime) > executeSep) { \3@A C7
//System.out.print("lastExecuteTime:"+lastExecuteTime); |+MV%QG;
//System.out.print(" now:"+now+"\n"); Qvd$fY**
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); q#~]Hp=W5
lastExecuteTime=now; 35[8XD
executeUpdate(); 'qg q8
} mjqVP.
else{ /RmHG
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); _}B:SM
} #TX=%x6
} |O]oX[~
} z3[0BWXs
//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 -f-2!1&<3h
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类写好了,下面是在JSP中如下调用。 8HLcDS#
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<% r.:H`
CountBean cb=new CountBean(); #}A
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ep<2u
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CountCache.add(cb); 97um7n
out.print(CountCache.list.size()+"<br>"); Ng} AEAFp
CountControl c=new CountControl(); zSiSZMP"
c.run(); Y Hv85y
out.print(CountCache.list.size()+"<br>"); E*Q><UU
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