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: ,{(XT7hr
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CountBean.java $E; Tj|W
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/* rrgOp5aV"
* CountData.java ^%Y-~yB-
* ps` j>vX*
* Created on 2007年1月1日, 下午4:44 :,qvqh][
* /L(}VJg-
* To change this template, choose Tools | Options and locate the template under 4|cRYZj5
* the Source Creation and Management node. Right-click the template and choose g#6R(
* Open. You can then make changes to the template in the Source Editor. FaWc:GsfB
*/ #>G:6'r
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package com.tot.count; PvW4%A@0
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/** )+,h}XqlX
* $f+I#uJ
* @author +zDRed_]=_
*/ NB^Al/V@
public class CountBean { DS@Yto
private String countType; RTg\c[=w
int countId; "|&3z/AUh
/** Creates a new instance of CountData */ oXk6,b"
public CountBean() {} jvR(e"
public void setCountType(String countTypes){ v/~&n
this.countType=countTypes; 8[AU`F8W
} An?#B4:
public void setCountId(int countIds){ 2Rwd\e.z
this.countId=countIds; jd5kkX8=
} sieC7raO
public String getCountType(){ 9qGba=}Ey
return countType; :,$"Gk
} E^{!B]/oP
public int getCountId(){ sEfT#$ a^8
return countId; Zi\ex\ )5
} Vz-q7*o$S
} csJ)Pt?d
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CountCache.java c,)]!{c
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/* %B1TN#KoT
* CountCache.java [x=(:soEqC
* LN$T.r+
* Created on 2007年1月1日, 下午5:01 xf7YIhL^*
* aYc<C$:NC"
* To change this template, choose Tools | Options and locate the template under b-<@3N.9]
* the Source Creation and Management node. Right-click the template and choose 726UO#*
* Open. You can then make changes to the template in the Source Editor. Y+g(aak+.
*/ WLVkrTvX
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package com.tot.count; <RC %<
import java.util.*; rhaq!s38:
/** P&[&Dj
* )ryP K"V
* @author %8Y+Df;ax
*/ CHO_3QIz
public class CountCache { >@?mP$;=
public static LinkedList list=new LinkedList(); ~g#/q~UE
/** Creates a new instance of CountCache */ suWO:]FR
public CountCache() {} fY78
public static void add(CountBean cb){ HSU?4=Q
if(cb!=null){ HFyQ$pbBU
list.add(cb); !OPHS^L
} %yfl-c(u
} .qYQ3G'V
} !:esdJH
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CountControl.java q;sZwp<
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/* Ijz*wq\s;
* CountThread.java grkA2%N
* ]8$H 'u(C
* Created on 2007年1月1日, 下午4:57 -,g.39u
* .YB/7-%M[
* To change this template, choose Tools | Options and locate the template under .rwW5"RPq
* the Source Creation and Management node. Right-click the template and choose Nq9M$Nt]
* Open. You can then make changes to the template in the Source Editor. k*,+ag*j
*/ EASmB
; 5[W*,7s
package com.tot.count; ^liW*F"UY
import tot.db.DBUtils; L+@X]OW8
import java.sql.*; P&:[pPG
/** (ToD
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* l S
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* @author Fe:
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*/ :1bDkoK
public class CountControl{ (@^ySiU
private static long lastExecuteTime=0;//上次更新时间 H;tE=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 (w(k*b/
/** Creates a new instance of CountThread */ J
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public CountControl() {} [Ne'2z
public synchronized void executeUpdate(){ ]Z=al`-
Connection conn=null; v7#|%
PreparedStatement ps=null; G7-k ,P^
try{ ,BGUIu6
conn = DBUtils.getConnection(); PVljb=8F
conn.setAutoCommit(false); tW-[.Y -M,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); w"QZ7EyJ
for(int i=0;i<CountCache.list.size();i++){ 4qsxlN>4O
CountBean cb=(CountBean)CountCache.list.getFirst(); 0u( 0*Xl
CountCache.list.removeFirst(); *0V'rH)
ps.setInt(1, cb.getCountId()); <|82)hO
ps.executeUpdate();⑴ $[7/~I>m
//ps.addBatch();⑵ >mEfd=p
} Zvfy%k
//int [] counts = ps.executeBatch();⑶ ,PJC FQMR
conn.commit(); )4:]gx#cr
}catch(Exception e){ <1*\ ~CX
e.printStackTrace(); M ]O4
} finally{ Q uw|KL
try{ Vwjic2lGI
if(ps!=null) { :mf&,?
ps.clearParameters(); BxQ,T@
ps.close(); \>n[x;$
ps=null; 3qH1\
} 31e
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}catch(SQLException e){} ^~bdAO81
DBUtils.closeConnection(conn); $bZ-b1{c C
} vo&h6'i>7
} E:A!tu$B
public long getLast(){ N{@~(>ee^
return lastExecuteTime; }?+tX <j
} \M0's&