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: Gmf.lHr$%
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CountBean.java -H#{[M8xX
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/* Zm4IN3FGLv
* CountData.java Ul)2A
* S9t_2%e
* Created on 2007年1月1日, 下午4:44 1BmevEa)
* cL7je
* To change this template, choose Tools | Options and locate the template under p9y
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* the Source Creation and Management node. Right-click the template and choose {|O8)bW'
* Open. You can then make changes to the template in the Source Editor. &NL=Bd
*/ pdngM8n
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package com.tot.count; r\.1=c#"bP
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/** { %vX/Ek
* ;lB%N
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* @author &Ru|L.G`
*/ 4t|ril``]
public class CountBean { P*BA
private String countType;
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int countId; x;?4A J{
/** Creates a new instance of CountData */ D\jRF-z
public CountBean() {} =hH>]$J[
public void setCountType(String countTypes){ kS%FV;9>(
this.countType=countTypes; G29PdmY$<
}
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public void setCountId(int countIds){ ={o>g'
this.countId=countIds; !vHnMY~AG
} <=l!~~%
public String getCountType(){ }3!83~Qbx
return countType; snK$? 9vh
} Zm>Q-7r9
public int getCountId(){ k3da*vwE
return countId; \SHYwD}*Pr
} <!v^Df
} y+)][Wa0
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CountCache.java T2P0(rEz
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/* ;XMbjWc
* CountCache.java Zrr3='^s
* ;e_dk4_
* Created on 2007年1月1日, 下午5:01 Ou"QUn|
* vQ#$.*Cvn
* To change this template, choose Tools | Options and locate the template under G|Yw
a=
* the Source Creation and Management node. Right-click the template and choose !h4S`2oZ/
* Open. You can then make changes to the template in the Source Editor. mnzamp
*/ (`5No:?v<
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package com.tot.count; y)X;g:w
import java.util.*; tO~DA>R
/** M}k )Ep9
* s4<[f%^
* @author 3ZGU?Z;R
*/ EDcR:Dw3
public class CountCache { `Rub"zM
public static LinkedList list=new LinkedList(); )mz [2Sfg
/** Creates a new instance of CountCache */ 8p,q9Ey
public CountCache() {} BNw^ _j1
public static void add(CountBean cb){ 16 _HO%v->
if(cb!=null){ T;XEU%:LK
list.add(cb); @s}I_@
} 7L|w~l7R~
} pk%I98! Jy
} TG8QT\0G
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CountControl.java OkGg4X|9
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/* G(~d1%(
* CountThread.java j0B, \A
* yv=LT~
* Created on 2007年1月1日, 下午4:57 DmEmv/N=
* &W:Wv,3
* To change this template, choose Tools | Options and locate the template under s-Q-1lKV,
* the Source Creation and Management node. Right-click the template and choose tSV}BM,
* Open. You can then make changes to the template in the Source Editor. 7h?PVobe
*/ TviC1 {2
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package com.tot.count; :WIbjI=
import tot.db.DBUtils; !MSz%QcO
import java.sql.*; =unMgX]$
/** TOdH
* .7++wo!,
* @author O`~G'l&@T
*/ ck>|p09q'9
public class CountControl{ 5V!L~#
private static long lastExecuteTime=0;//上次更新时间 TS^(<+'
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 y:WRpCZoa
/** Creates a new instance of CountThread */ 7}(wEC
public CountControl() {} lEIX,amwa
public synchronized void executeUpdate(){ W"? |O Q'
Connection conn=null; #Z;ziM:
PreparedStatement ps=null; M8X*fYn
try{ / tM<ois*
conn = DBUtils.getConnection(); K++pH~o
conn.setAutoCommit(false); 4Z)`kS}=]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $6}siU7s4
for(int i=0;i<CountCache.list.size();i++){ EGO;g^,
CountBean cb=(CountBean)CountCache.list.getFirst(); }`{>]2
CountCache.list.removeFirst(); UeV2`zIg`
ps.setInt(1, cb.getCountId()); D-\\L[
ps.executeUpdate();⑴ 0kS[`a(}J
//ps.addBatch();⑵ M;OY+|uA
} XeX0\L')R
//int [] counts = ps.executeBatch();⑶ I~H:-"2
conn.commit(); pXL_`=3Q
}catch(Exception e){ Q%KH^<
e.printStackTrace(); D{'x7!5r
} finally{ $%ZEP>]
try{ X&nkc/erx
if(ps!=null) { S!A)kK+
ps.clearParameters(); Zy,U'Dv
ps.close(); A\ds0dUE
ps=null; !;.i#c_u
} } R!-*Wk
}catch(SQLException e){} 6pDb5@QjTy
DBUtils.closeConnection(conn); L3lf2 8W
} G 5w:
} _?#}@?
public long getLast(){ mwVH>3{j
return lastExecuteTime; ?&EPZq