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: k|;a"56F
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CountBean.java zhn?;Fi
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/* `J.,dqGb
* CountData.java !*#9b
* [Sm<X
* Created on 2007年1月1日, 下午4:44 t'44X
* <6Q^o[L
* To change this template, choose Tools | Options and locate the template under Cut~k"lv
* the Source Creation and Management node. Right-click the template and choose >_}isCd,
* Open. You can then make changes to the template in the Source Editor. @|Pm%K`1
*/ *;A ;)'
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package com.tot.count; "| '~y}v_
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/** ktyplo#F
* i~u4v3r=
* @author 3&-rOc
*/ ^to*ET{0
public class CountBean { ?|M-0{
private String countType; v-8>@s jy8
int countId; !f~a3 {;j
/** Creates a new instance of CountData */ R~g|w4a@sC
public CountBean() {} _U~R
public void setCountType(String countTypes){ %2 r~
this.countType=countTypes; '?rR>$s
} XM]m%I
public void setCountId(int countIds){ t&U9Z$LS
this.countId=countIds; b**vUt\
} =R5W
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public String getCountType(){ KsULQJ#,
return countType; c9/w{}F
} JH?ohA
public int getCountId(){ ,3:f4e\<
return countId; SdH=1zBc
} s$fM,l:!
} /H'- }C
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CountCache.java k3Yu"GY^
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/* vj?{={Y
* CountCache.java 1<!P:@(
* !U`4
* Created on 2007年1月1日, 下午5:01 Jn hdZa
* {~apY,3
* To change this template, choose Tools | Options and locate the template under >iTmILA
* the Source Creation and Management node. Right-click the template and choose %FjUtB
* Open. You can then make changes to the template in the Source Editor. *BKD5EwS
*/ Iy)1(upM
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package com.tot.count; ~ 5}t;
import java.util.*; pm
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/** Bl\:YYd
* {a[BhK'g
* @author TuwP'g[
*/ I_1?J*
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public class CountCache { Y}[<KK}_
public static LinkedList list=new LinkedList(); e'mF1al
/** Creates a new instance of CountCache */ k+_>`Gre}
public CountCache() {} O*N:A[eW
public static void add(CountBean cb){ o)I)I/v
if(cb!=null){ YJ~<pH
list.add(cb); H;`F}qQ3
} VxY]0&sq
} j*3;G+
} S9dxrm?
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CountControl.java 19fa7E<
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/* >Tf}aI+
* CountThread.java G2`YZ\
* %M
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* Created on 2007年1月1日, 下午4:57 q^[t</_N
* &g?GF\Y
* To change this template, choose Tools | Options and locate the template under g1t6XVS$9
* the Source Creation and Management node. Right-click the template and choose 3,i j@P
* Open. You can then make changes to the template in the Source Editor. ld(60?z>FH
*/ i9 aR#
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package com.tot.count; b`e_}^,c
import tot.db.DBUtils; [#KY.n
import java.sql.*; Jxl'!8t
/** WB:0}b0Gu
* jr6 0;oK+
* @author W'6DwV|
*/ jI,[(Z>
public class CountControl{ %;&lVIU0
private static long lastExecuteTime=0;//上次更新时间 -'c
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 HQ+{9Z8
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/** Creates a new instance of CountThread */ L;:|bVH
public CountControl() {} T#*,ME7|m
public synchronized void executeUpdate(){ fTEZ@#p
Connection conn=null; yl$Ko
PreparedStatement ps=null; 1ZFKLI`V
try{ 1(;{w+nM
conn = DBUtils.getConnection(); r(^00hvH
conn.setAutoCommit(false); |?KYY0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {/noYB<;
for(int i=0;i<CountCache.list.size();i++){ fV+a0=Z
CountBean cb=(CountBean)CountCache.list.getFirst(); '6zZ`Ll9
CountCache.list.removeFirst(); hT^&