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: vqN/ crJ@
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CountBean.java u1 Q;M`+>
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/* @/:4beh
* CountData.java 4NID:<
* %4nf(|8n
* Created on 2007年1月1日, 下午4:44
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* zu1"`K3b
* To change this template, choose Tools | Options and locate the template under i9L]h69r
* the Source Creation and Management node. Right-click the template and choose 4z(~)#'^
* Open. You can then make changes to the template in the Source Editor. b1?^9c#0d
*/ Ss%Cf6qdWL
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package com.tot.count; G*4I;'6
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/** wnC} TWxX
* !An?<Sv$
* @author j{Px}f(=
*/ }!_z\'u
public class CountBean { NfClR HpVc
private String countType; !\7M7
int countId; ~6;I"0b5
/** Creates a new instance of CountData */ F- -g?Q^
public CountBean() {} D>y5&`
public void setCountType(String countTypes){ &)OI!^ (
this.countType=countTypes; Zye04&x9k
} "Ol:ni1
public void setCountId(int countIds){ B{)#A?Rh.
this.countId=countIds; >T]9.`xhK
} DP),~8
public String getCountType(){ #//xOL3J
return countType; &9flNoNR9
} th73eC'
public int getCountId(){ JH\:9B+:L
return countId; Hl}lxK,]
} :f[ w
} r<ww%2HTS
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CountCache.java p/(Z2N"
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/* R%szN.cI
* CountCache.java * F%1~
*
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* Created on 2007年1月1日, 下午5:01 hZ 1enej)
* O5r8Ghf)
* To change this template, choose Tools | Options and locate the template under q%x i>H.:{
* the Source Creation and Management node. Right-click the template and choose 'etA1]<N
* Open. You can then make changes to the template in the Source Editor. OM1Z}%J
*/ LVg#E*J
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package com.tot.count; )IcSdS0@M
import java.util.*; 9>4 #I3
/** lC#wh2B6
* Q!q6R^5!K
* @author oH w!~c7
*/ y>=Y MD
public class CountCache { 7nT|yL?
public static LinkedList list=new LinkedList(); `+n0a@BVB
/** Creates a new instance of CountCache */ &j:e<{@
public CountCache() {} :O413#8
public static void add(CountBean cb){ / ]8e[t>!f
if(cb!=null){ ?TpjU*Cxy
list.add(cb); 2FuV%\p
} F2
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} h|]cZMGo
} 0 8)f
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CountControl.java [@9S-$Xa
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/* #;!@Pf
* CountThread.java "BT M,CB
* z"
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* Created on 2007年1月1日, 下午4:57 h)Fc<,vwBE
* BX$<5S@
* To change this template, choose Tools | Options and locate the template under #8h7C8]&
* the Source Creation and Management node. Right-click the template and choose \C$e+qb~{
* Open. You can then make changes to the template in the Source Editor. In1{&sS
*/ }169]!R
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package com.tot.count; _b<;n|^
import tot.db.DBUtils; KyrZ&E.`
import java.sql.*; OvT[JpV
/** 9.(|ri
* {{G3^ysa
* @author AM=,:k$
*/ Y0g]-B
public class CountControl{ c/+6M
private static long lastExecuteTime=0;//上次更新时间 )yyH_Ax2
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 [lML^CYQ
/** Creates a new instance of CountThread */ ZY,$oFdsi
public CountControl() {} 'l(s)Oa{M:
public synchronized void executeUpdate(){ zI[<uvxzW`
Connection conn=null; /lR*ab
PreparedStatement ps=null; 8a*&,W
try{ P@@MQ[u?!.
conn = DBUtils.getConnection(); *jhgCm
conn.setAutoCommit(false); 'nPI
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =-Hhm($n
for(int i=0;i<CountCache.list.size();i++){ .I~:j`K6
CountBean cb=(CountBean)CountCache.list.getFirst(); WA2NjxYz
CountCache.list.removeFirst(); [q%`q`EG
ps.setInt(1, cb.getCountId()); 60|PVsmDm
ps.executeUpdate();⑴ .<?7c!ho
//ps.addBatch();⑵ ;@S'8
} |9XoRGgXU
//int [] counts = ps.executeBatch();⑶ v_Vw!u
conn.commit(); e'uC:O.u
}catch(Exception e){ )w4U]inJ$"
e.printStackTrace(); HlX~a:.7
} finally{ 3:xx:Jt
try{ o*A, 6y
if(ps!=null) { U+'zz#0qN
ps.clearParameters(); 0&