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: GX&BUP\
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CountBean.java 75r>~@)*
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/* D*o_IrG_(
* CountData.java Z%y>q|:
* Y
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* Created on 2007年1月1日, 下午4:44 xM8}Xo
* l{>fma]7
* To change this template, choose Tools | Options and locate the template under /WRS6n
* the Source Creation and Management node. Right-click the template and choose P_B#
* Open. You can then make changes to the template in the Source Editor. =\B{)z7@6D
*/ & 1p\.Y
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package com.tot.count; R5g-b2Lm
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/** ^ ~:f02[D
* +wXrQV
* @author WW{5[;LYiB
*/ gV$j ]
public class CountBean { %%`Nq&'
private String countType; @*]l.F
int countId; klxVsx%I{G
/** Creates a new instance of CountData */ 4*}[h9J}\
public CountBean() {} u =z$**M^
public void setCountType(String countTypes){ V&;1n
this.countType=countTypes; +>/ariRr
} Ve*NM|jg
public void setCountId(int countIds){ dqnH7okZ
this.countId=countIds; F B9PIsFS
} 'iA#lKG
public String getCountType(){ ,;)Y1q}Q
return countType; mE'y$5ZxY
} lYmqFd~p
public int getCountId(){ U`N|pPe:w
return countId; #qrZ(,I@n
} {e\Pd!D?|
} u~[HC)4(0
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CountCache.java u?5d%]*
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/* u.sF/T=6f
* CountCache.java }IO<Dq=[
* +PgUbr[p
* Created on 2007年1月1日, 下午5:01 n|2`y?
* |z\5Ik!fF]
* To change this template, choose Tools | Options and locate the template under ~XN--4%Q
* the Source Creation and Management node. Right-click the template and choose '?=SnjMX
* Open. You can then make changes to the template in the Source Editor. :Rv?>I j
*/ d~F`q7F'?]
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package com.tot.count; +^ a9i5
import java.util.*; fZ1v|
/** s7.2EkGl=
* IhnHNY]<g
* @author oJa6)+b(3
*/ s3qWTdM
public class CountCache { 28FC@&'H
public static LinkedList list=new LinkedList(); 'QGacV
/** Creates a new instance of CountCache */ , dT.q
public CountCache() {} 7jvy]5y8&~
public static void add(CountBean cb){ NbOeF7cq+
if(cb!=null){ 9ZvBsG)
list.add(cb); r@N 0%JZZ
} /~3~Xc~=p
} 4;"^1 $
} 5v"r>q[
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CountControl.java VD[x}8ei
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/* ",/3PT
* CountThread.java v{{Cj83S+
* )E;+C2G
* Created on 2007年1月1日, 下午4:57 dFY]~_P472
*
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* To change this template, choose Tools | Options and locate the template under .5Y%I;~v
* the Source Creation and Management node. Right-click the template and choose w-2&6o<n-
* Open. You can then make changes to the template in the Source Editor. Eu/~4:XN
*/ OLXkiesK{
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package com.tot.count; @L^Fz$Sx
import tot.db.DBUtils; (vte8uQe
import java.sql.*; hUirvDvX
/** mk>L:+
* m"Y;GzqQl
* @author ~3}Gu^@
*/ o(xRq;i
public class CountControl{ JFaxxW
private static long lastExecuteTime=0;//上次更新时间 V:F;Nq%+j
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 9hAS#|vK
/** Creates a new instance of CountThread */ 0_yE74i
public CountControl() {} <hi@$.u_Q^
public synchronized void executeUpdate(){ -r/G)Rs
Connection conn=null; !_GY\@}
PreparedStatement ps=null; 3L/qU^`
try{ J6x\_]1:*
conn = DBUtils.getConnection(); b i^h&H
conn.setAutoCommit(false); j]7|5mC78
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *]2LN$
for(int i=0;i<CountCache.list.size();i++){ v-6"*EP
CountBean cb=(CountBean)CountCache.list.getFirst(); xGbr>OqkTX
CountCache.list.removeFirst(); gyH'92ck
ps.setInt(1, cb.getCountId()); L(!4e
ps.executeUpdate();⑴ 2mL1BG=Yk
//ps.addBatch();⑵ ?]gZg[
} dDH+`;$.
//int [] counts = ps.executeBatch();⑶ ~XGO^P"?
conn.commit(); C("PCD
}catch(Exception e){ 4X7y}F.J
e.printStackTrace(); Mr'}IX5
} finally{ 'G6TSl
try{ ${'gyD
if(ps!=null) { ja$>>5<q
ps.clearParameters(); *Yv"lB8
ps.close(); GZT}aMMSJ
ps=null; 7SzY0})<U
} M<JJQh5
}catch(SQLException e){} Cus=UzL
DBUtils.closeConnection(conn); E%eao$
} T#Pz_
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} iU^ 4a
public long getLast(){ 4W8rb'B!Ay
return lastExecuteTime; l|`FW
} Bc}<B:q%b
public void run(){ (ohkM`83k
long now = System.currentTimeMillis(); Qu]0BVIe
if ((now - lastExecuteTime) > executeSep) { /rp4m&