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:
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CountBean.java 03Ycf'W
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/* ^ZcGY+/~
* CountData.java {!L~@r
* /([kh~a
* Created on 2007年1月1日, 下午4:44 ;)*eo_tQ
* %tGO?JMkd
* To change this template, choose Tools | Options and locate the template under Bwxd&;E
* the Source Creation and Management node. Right-click the template and choose \R_C&=
* Open. You can then make changes to the template in the Source Editor. Ti5-6%~&
*/ _G@GpkSe>
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package com.tot.count; d#FQc18v}k
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/** XRi8Gpg
* Q197mN+0
* @author 73;GW4,
*/ _Fl9>C"u
public class CountBean { 7?_CcRe
private String countType; )ez9"# MH'
int countId; W|mo5qrLS2
/** Creates a new instance of CountData */ 3=j"=-=
public CountBean() {} PJH&
public void setCountType(String countTypes){ kl:Bfs)b
this.countType=countTypes; /U9"wvg
} f]CXu3w(J
public void setCountId(int countIds){ h:|qC`}
this.countId=countIds; wmLs/:~
} VI86KJu
public String getCountType(){ +mn[5Y} :
return countType; q/,O\,
} Q;rX;p^W
public int getCountId(){ NBGH_6DROw
return countId; kuP(r
} z
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} ?e 4/p
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CountCache.java F )eelPZ+,
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/* j\M?~=*w
* CountCache.java ` Sz}`+E
* G 3ptx!
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* Created on 2007年1月1日, 下午5:01 @j/a=4o[
* bk[!8-b/a
* To change this template, choose Tools | Options and locate the template under R6->t #n,
* the Source Creation and Management node. Right-click the template and choose zO6oT1I
* Open. You can then make changes to the template in the Source Editor. \9T7A&
*/ K$=zi}J W
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package com.tot.count; ckCE1e>s
import java.util.*; mC#>33{
/** J|7 3.&B
* `ERz\`d~Y;
* @author M_DwUS1?
*/ +NUG
public class CountCache { abVmkdP_s
public static LinkedList list=new LinkedList(); eHUOU>&P]
/** Creates a new instance of CountCache */ kAUymds;O
public CountCache() {} f!X[c?Xy"
public static void add(CountBean cb){ ~P-mC@C
if(cb!=null){ CrTw@AW9)
list.add(cb); 4Z0]oIX
} G3T]`Atf
} xAm6BB
c
} a%0EiU
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CountControl.java
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/* C0Z=~Q%
* CountThread.java >vsqG=x
* _+MJ%'>S
* Created on 2007年1月1日, 下午4:57 GM<9p_
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* I>$&-i
* To change this template, choose Tools | Options and locate the template under OY({.uV dX
* the Source Creation and Management node. Right-click the template and choose hDGF7
* Open. You can then make changes to the template in the Source Editor. E]r?{t`]
*/ owv[M6lbD
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package com.tot.count; wMN]~|z>
import tot.db.DBUtils; dPRra{
import java.sql.*; WNc0W>*NE1
/** *LY8D<:zs
* U6s[`H3I{
* @author f|(M.U-
*/ 6Kz,{F@
public class CountControl{ x,'!gT:j
private static long lastExecuteTime=0;//上次更新时间 \~ wMfP8
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 $ ocdI5
/** Creates a new instance of CountThread */ M',?u
public CountControl() {} klhtKp_p
public synchronized void executeUpdate(){ 2Tppcj v
Connection conn=null; [2cD:JL
PreparedStatement ps=null; _@/8gPT*i
try{ j] [,J49L
conn = DBUtils.getConnection(); k9F=8q
conn.setAutoCommit(false); c&Q$L }
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Eh4=ZEX
for(int i=0;i<CountCache.list.size();i++){ ?aMOZn?
CountBean cb=(CountBean)CountCache.list.getFirst(); <gBA1oRz
CountCache.list.removeFirst(); <OPArht
ps.setInt(1, cb.getCountId()); ?Mfw]z"\C)
ps.executeUpdate();⑴ |4`{]2C
//ps.addBatch();⑵ 93hxSRw
} 0{SL&<&