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: @ )Nw>/;o
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CountBean.java ti!kJ"q
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/* Hq#q4Y
* CountData.java ]DjnzClx
* Scfe6+\EW
* Created on 2007年1月1日, 下午4:44 </!GU*
* E?S
* To change this template, choose Tools | Options and locate the template under ^j7>Ul,
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. `Gh J)WA<
*/ pU1miA '
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package com.tot.count; >!bw8lVV
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/** 6'Q*SO;1gh
* lP*p7Y '
* @author
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*/ $},_O8R
public class CountBean { a%r( F
private String countType; 1>L8EImx]V
int countId; Zmm6&OZ%
/** Creates a new instance of CountData */ kK=f@l
public CountBean() {} mcTC'. 9
public void setCountType(String countTypes){ E8L\3V4
this.countType=countTypes; lUd4`r"
} Qt>Bvu Q
public void setCountId(int countIds){ $kc cM&B
this.countId=countIds; )v\ A8)[
} 'm0_pM1:D
public String getCountType(){ y+h/jEbM</
return countType; Yf_/c*t\5
} -J>f,zA
public int getCountId(){ p^ ONJL
return countId; o_a' <7\#i
} |k#EYf#Y
} pgPm0+N
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CountCache.java MavidkS
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/* b%7zu}F
* CountCache.java b9VI(s>
* }Z)YK}_1
* Created on 2007年1月1日, 下午5:01 Q w)U
* w5=<}1`St
* To change this template, choose Tools | Options and locate the template under )JY#8,{w
* the Source Creation and Management node. Right-click the template and choose a]!u
go}
* Open. You can then make changes to the template in the Source Editor. .|@2Uf
*/ duc\/S'
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package com.tot.count; 0{/'[o7
import java.util.*; Wr`<bLq1vs
/** `+i/rc1.
* :-$TD('F
* @author a:KL{e[
*/ zEh&@{u?
public class CountCache { `aSbGMz
public static LinkedList list=new LinkedList(); b^A7R{G7
/** Creates a new instance of CountCache */ 2 SU
public CountCache() {} Bf;<3k)5.
public static void add(CountBean cb){ A@Cvx7X
if(cb!=null){ 8S5Q{[ !
list.add(cb); #vc!SI
} MzF,is
} F~/~_9RJ
} rpc;*t+z
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CountControl.java *Ag3qnY
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/* qp{~OW3
* CountThread.java nfh<3v|kvR
* !QCErE;r
* Created on 2007年1月1日, 下午4:57 h6?o)Q>N
* oJ|m/i)
* To change this template, choose Tools | Options and locate the template under G=l:v
* the Source Creation and Management node. Right-click the template and choose xl Q]"sm1
* Open. You can then make changes to the template in the Source Editor. t ?05
*/ 5"bg8hL
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package com.tot.count; &~'i,v|E
import tot.db.DBUtils; jQ8
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import java.sql.*; y5 X FJj
/** ^4xl4nbx
* (a"/cH
* @author sGE%zCB
*/ OW#G{#.6R
public class CountControl{ ";^_[n
private static long lastExecuteTime=0;//上次更新时间 7Rd(,eWE@
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 qDgy7kkQ
/** Creates a new instance of CountThread */ \eAV: qV
public CountControl() {} J!">L+Zcx
public synchronized void executeUpdate(){ js!C`]1
Connection conn=null; Kd\d>&b
PreparedStatement ps=null; X9?0`6Li
try{ ilZQ/hOBH
conn = DBUtils.getConnection(); {asq[;]
conn.setAutoCommit(false); PKd'lo
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); X{ :3UTBR
for(int i=0;i<CountCache.list.size();i++){ ,;Uf>8~
CountBean cb=(CountBean)CountCache.list.getFirst(); Hs6Kki1
CountCache.list.removeFirst(); A@-U#UvN
ps.setInt(1, cb.getCountId()); OTNI@jQ)
ps.executeUpdate();⑴ @'y8* _
//ps.addBatch();⑵ Df$~=A}
} s[VYd:}se
//int [] counts = ps.executeBatch();⑶ c4zGQoeH:
conn.commit(); olKM0K
}catch(Exception e){ *;Cpz[N
e.printStackTrace(); 3J8M0W
} finally{ /. H(&
try{ OzR<jCOS
if(ps!=null) { 2`A[<