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: B;zt#H4
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CountBean.java 1hQN8!: <
RNJFSD.
/* o3Ot.9L
* CountData.java {Q(}DI
* $K}.
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* Created on 2007年1月1日, 下午4:44 SOh-,c\C
* [IX+M#mf
* To change this template, choose Tools | Options and locate the template under 'A{h iY
* the Source Creation and Management node. Right-click the template and choose t=wXTK5"
* Open. You can then make changes to the template in the Source Editor. Ggm` ~fS
*/ s&PM,BFf
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package com.tot.count; I+?hG6NM
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/** {")\0|2\x
* eQN.sl5
* @author nS.G~c|
*/ 9(1rh9`=
public class CountBean { ,{}#8r` +*
private String countType; |H)cuZ
int countId; ?bX
/** Creates a new instance of CountData */ ^QL 877
public CountBean() {} H'g?llh1J
public void setCountType(String countTypes){ :-+4:S
this.countType=countTypes; X)Gp7k1w
} loOOmHhJ&
public void setCountId(int countIds){ gSi5u#}J
this.countId=countIds; I}0_nge
} lu\o`m5wF
public String getCountType(){ =7/-i
return countType; 7k8n@39?
} %_)zWlN
public int getCountId(){ p]|LV)R n
return countId; 2:^njqX
} 'x%x'9OP
} |m>}%{
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CountCache.java ocA]M=3~k
CY"i-e"q<Q
/* m#@_8_ M
* CountCache.java MWwJzVL8
* K b(9)Re
* Created on 2007年1月1日, 下午5:01 LsTffIP
* R, 0Oq5
* To change this template, choose Tools | Options and locate the template under BW K IbG
* the Source Creation and Management node. Right-click the template and choose pdz'!I
* Open. You can then make changes to the template in the Source Editor. wyQb5n2`;~
*/ wK5_t[[
v <h;Di@
package com.tot.count; 3VO:+mT
import java.util.*; AlX3Wv}
/** L]-w;ll-
* TipHV;|e
* @author ZwJciT!_~
*/ h8v>zNf'
public class CountCache { %J P!{mqj
public static LinkedList list=new LinkedList(); s (PY/{8
/** Creates a new instance of CountCache */ 7 `Du5>b8
public CountCache() {} gA:TL{X0
public static void add(CountBean cb){ {8CWWfHCD
if(cb!=null){ A~71i&
list.add(cb); P[i\e7mR
} U ":"geU
} hPO>,j^
} %KV2<t?
)/Y~6A9>
CountControl.java g9V.13k
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/* +VOb
* CountThread.java ixI:@#5wY
* }98-5'u.X
* Created on 2007年1月1日, 下午4:57 +TX/g~
* G11cNr>*
* To change this template, choose Tools | Options and locate the template under j#igu#MB*
* the Source Creation and Management node. Right-click the template and choose ^ KOzCLC
* Open. You can then make changes to the template in the Source Editor. 42@a(#z(U
*/ LknVqZ|k
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package com.tot.count; ,}7_[b)&V
import tot.db.DBUtils; Bl4 dhBZoO
import java.sql.*; %$9:e
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/** #"r kuDO
* EA yukM2
* @author p7 [(z
*/ sp{j!NSL
public class CountControl{ ,"H?hFQ
private static long lastExecuteTime=0;//上次更新时间 2f{kBD
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 BE4\U_]a3
/** Creates a new instance of CountThread */ 4x]NUt
public CountControl() {} Q\WXi
public synchronized void executeUpdate(){ x]'H jTqX
Connection conn=null; *`.LA@bHU
PreparedStatement ps=null; nKu(XgFv
try{ gMay
conn = DBUtils.getConnection(); p">WK<N
conn.setAutoCommit(false); 'FxYMSZS$
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); swt\Ru6,
for(int i=0;i<CountCache.list.size();i++){ .+uVgSN
CountBean cb=(CountBean)CountCache.list.getFirst(); .f%vDBJS
CountCache.list.removeFirst(); 6vWii)O.D
ps.setInt(1, cb.getCountId()); jrcc
ps.executeUpdate();⑴ 24O
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//ps.addBatch();⑵ ~Jxlj(" 0(
} @7X\tV.Z
//int [] counts = ps.executeBatch();⑶ "c EvFY
conn.commit(); un&>
}catch(Exception e){ QpJIDM/
e.printStackTrace(); Q'C4pn@
} finally{ oVreP
try{ w'XSb.\)_m
if(ps!=null) { {[lx!QF 8&
ps.clearParameters(); L:^Y@[f
ps.close(); }Fz!6F2w
ps=null; 'Ye]eL,I\
} #4lHaFq
}catch(SQLException e){} Sy:K:Z|[U
DBUtils.closeConnection(conn); !8Y3V/)NU
} xpz`))w
} "d:.*2Z2
public long getLast(){ $Uy#/MX
return lastExecuteTime; hsz$S:am
} Z{
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public void run(){ KG-UW
long now = System.currentTimeMillis(); U#iT<#!l2
if ((now - lastExecuteTime) > executeSep) { x6jm-n
//System.out.print("lastExecuteTime:"+lastExecuteTime); O/nqNQ?<
//System.out.print(" now:"+now+"\n"); [ns&Y0Y`t
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); {#0Tl
lastExecuteTime=now; vg5E/+4gp%
executeUpdate(); C\J@fpH(t`
} . ^BWR
else{ EJv! tyJ\[
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Fr<Pe&d