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: _x,X0ncv]@
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CountBean.java 5H0qMt P
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/* :>0ywg
* CountData.java pAE
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* @N4_){s*
* Created on 2007年1月1日, 下午4:44 qzUiBwUi@
* N PT-d
* To change this template, choose Tools | Options and locate the template under DM^0[3XuV5
* the Source Creation and Management node. Right-click the template and choose R| ?Q&F_$
* Open. You can then make changes to the template in the Source Editor. ~~W.]>f
*/ bY" zK',m
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package com.tot.count; x77L"5g
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/** )QE6X67i
* r&]XNq'P9
* @author wk|+[Rl;L
*/ -V/y~/]J
public class CountBean { ^k=<+*9
private String countType; I2[Z0G@&=
int countId; v -}f
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/** Creates a new instance of CountData */ d @R7b^#g
public CountBean() {} E(~7NRRm
public void setCountType(String countTypes){ .q9Sg8G
this.countType=countTypes; 3ZXAAV
} 5whW>T
public void setCountId(int countIds){ pU7;!u:c4%
this.countId=countIds; lL)f-8DX
} |OH*c3~r
public String getCountType(){ rmX*s}B
return countType; Hd~g\
} }dkXRce*
public int getCountId(){ Y)sB]!hx
return countId; ):$KM{X
} OcTWq
} lVvcrU
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CountCache.java 46>rvy.r
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/* ^Arv6kD,
* CountCache.java `MI\/oM@
* ET}Z>vU}+
* Created on 2007年1月1日, 下午5:01 1K Fd
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* )U %`7(bN
* To change this template, choose Tools | Options and locate the template under wL0[Slf}
* the Source Creation and Management node. Right-click the template and choose {`!6w>w0
* Open. You can then make changes to the template in the Source Editor. \3JCFor/
*/ ;'S,JGpvT
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package com.tot.count; A6z,6v6
import java.util.*;
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/** q} e#L6cM
* {=GmXd%D
* @author !Cr3>tA
*/ D6bYg `
public class CountCache { |+
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public static LinkedList list=new LinkedList(); syl7i>P
/** Creates a new instance of CountCache */ W.j^L;
public CountCache() {} _k@cs^
public static void add(CountBean cb){ *tqD:hiF
if(cb!=null){ [7I:Dm
list.add(cb); cW%)C.M
} [G}dPXD
} wn[)/*(,$(
} 7Eyi~jes
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CountControl.java )>ZT{eF
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/* $g>bp<9v4
* CountThread.java syX?O'xJ
* DTezG':
* Created on 2007年1月1日, 下午4:57 &|Gg46P7
* H$I~Vz[\yb
* To change this template, choose Tools | Options and locate the template under r2RJb6
* the Source Creation and Management node. Right-click the template and choose +f/
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* Open. You can then make changes to the template in the Source Editor. b}qfOgd5
*/ ~J].~^[
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package com.tot.count; |S8$NI2
import tot.db.DBUtils; K#OL/2^
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import java.sql.*; FyEKqYl
/** 1/-3m Po
* %0Ur3
* @author &~_F2]oM
*/ -}6ew@GE
public class CountControl{ IW\^-LI.
private static long lastExecuteTime=0;//上次更新时间 _[6sr7H!
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 3 yx[*'e$
/** Creates a new instance of CountThread */ ljbAfd
public CountControl() {} 1V2]@VQF
public synchronized void executeUpdate(){ |=q~X}DA
Connection conn=null; +R*DE5dz
PreparedStatement ps=null; ai<qK3!O
try{ HYdM1s6vo
conn = DBUtils.getConnection(); $FPq8$V
conn.setAutoCommit(false); (.#nl}fA
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); X_78;T)uA
for(int i=0;i<CountCache.list.size();i++){ ys`-QlkB
CountBean cb=(CountBean)CountCache.list.getFirst(); fG0ZVV!
CountCache.list.removeFirst(); KdoI
ps.setInt(1, cb.getCountId()); ]aPf-O*
ps.executeUpdate();⑴ do8[wej<:
//ps.addBatch();⑵ /r7xA}se^
} 6_`Bo%
//int [] counts = ps.executeBatch();⑶ f/Y&)#g>k
conn.commit(); [5&k{*}}
}catch(Exception e){ =`+D/
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e.printStackTrace(); yr%[IX]R
} finally{ .)/."V
try{ eA&