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: riRG9c |
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CountBean.java BkY#wJ'
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/* P@%L.y
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* CountData.java jy_4W!4a
* C0/G1\
* Created on 2007年1月1日, 下午4:44 X":2o|R
* d=
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* To change this template, choose Tools | Options and locate the template under Z?WVSJUVf
* the Source Creation and Management node. Right-click the template and choose s(e1kk}"
* Open. You can then make changes to the template in the Source Editor. Fc=6*.hy
*/ 7]~|dc(
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package com.tot.count; {,?Gj@$
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/** KHGUR(\Rd6
* Hs{x Z:
* @author tu/4
*/ FlY"OU*
public class CountBean { 2fNNdxdbT
private String countType; ,?`kYPZ
int countId; ly6dl
/** Creates a new instance of CountData */ :_`Yrx5
public CountBean() {} n xR\tBv
public void setCountType(String countTypes){ =W>a ~e]/
this.countType=countTypes; <fA}_BH%]
} e E(+
public void setCountId(int countIds){ 0QxBC7`qp
this.countId=countIds; &}K%F)S
} 8 qZbsZi4
public String getCountType(){ O@w_"TJP/z
return countType; OMd:#cWsQ
} (+<66
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public int getCountId(){ MBnxF^c&P
return countId; /LtbmV
} Sz]1`%_H/
} 4W<[& )7
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CountCache.java M
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/* d/awQXKe7
* CountCache.java <I 0om(P
* ln":j?`
* Created on 2007年1月1日, 下午5:01 E>O@Bv
* ;e9&WEG_\
* To change this template, choose Tools | Options and locate the template under +_QcLuV,
* the Source Creation and Management node. Right-click the template and choose zQUNvPYM
* Open. You can then make changes to the template in the Source Editor. P"Z1K5>2L
*/ g@pK9R%wH<
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package com.tot.count; N9M",(WTt}
import java.util.*; Vup|*d2r0E
/** 91DevizXx
* z46Sh&+
* @author } :gi<#-:G
*/ [HQ/MkP-Z
public class CountCache { =kz HZc
public static LinkedList list=new LinkedList(); U-U(_W5&
/** Creates a new instance of CountCache */ .Yz^r?3t
public CountCache() {} +ZFN8
public static void add(CountBean cb){ _a_T`fE&de
if(cb!=null){ ;ZMIYFXRqh
list.add(cb); P{Q$(rOe
} ~y
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} ] ;HCt=I~
} ^t$uDQ[hA
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CountControl.java n36iY'<) G
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/* gA3f@7}d
* CountThread.java }]<|`FNc
* fN:FD`
* Created on 2007年1月1日, 下午4:57 S@y?E}
* H
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* To change this template, choose Tools | Options and locate the template under ;lt8~ea
* the Source Creation and Management node. Right-click the template and choose c `.BN(
* Open. You can then make changes to the template in the Source Editor. 77wod}h!:
*/ -3 "<znv
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package com.tot.count; g1]bI$;
import tot.db.DBUtils; P\QbMj1U
import java.sql.*; 7s;;2<k;_
/** 7) af
* a:4!z;2
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* @author i CB:p
*/ 4Y4zBD=<
public class CountControl{ @RL'pKab9
private static long lastExecuteTime=0;//上次更新时间 -8dz`o}
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +rhBC
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/** Creates a new instance of CountThread */ 5fz
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public CountControl() {}
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public synchronized void executeUpdate(){ 8@RJ>
Connection conn=null; LvZ',u}
PreparedStatement ps=null; .RyuWh!5
try{ 1=`VaS
conn = DBUtils.getConnection(); +oHbAPs8
conn.setAutoCommit(false); ou`KkY||
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); xD sKb_
for(int i=0;i<CountCache.list.size();i++){ ;>F1?5P{
CountBean cb=(CountBean)CountCache.list.getFirst(); oMOh4NH,x
CountCache.list.removeFirst(); xVN!w\0
ps.setInt(1, cb.getCountId()); 3Wx\Liw,
ps.executeUpdate();⑴ C@<gCM j,"
//ps.addBatch();⑵ 9E0x\%2K
} FU.?n)P
//int [] counts = ps.executeBatch();⑶ I[w5V;>*
conn.commit(); ![J_6f}!
}catch(Exception e){ ~k}O"{
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e.printStackTrace(); %%)y4>I
} finally{ A>HCX 4i
try{ ,dVJAV7v
if(ps!=null) { 3-kL0Q["
ps.clearParameters(); 8HHR
ps.close(); vo2GFo
ps=null; @2-;,VL3
} m}S}fH(
}catch(SQLException e){} W5~!)Ec
DBUtils.closeConnection(conn); ?{5}3abB`
} X|QokAR{$>
} L{&=SR.
public long getLast(){ Vo%Z|
return lastExecuteTime; {z;4t&5
} " SP6o
public void run(){ Xs'qwL~{`
long now = System.currentTimeMillis(); >$)~B4
if ((now - lastExecuteTime) > executeSep) { wfcR[
//System.out.print("lastExecuteTime:"+lastExecuteTime); 1?.NJ<)F
//System.out.print(" now:"+now+"\n"); {vZAOz7#
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); w ykaf
lastExecuteTime=now; 6UL9+9[C
executeUpdate(); N.ZuSkRM
} 2"%f:?xV{
else{ ` K0PLxSv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ]&`=p{Z
} ]mgpd}Y
} #EB
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} .b^!f<j
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 F~bDg tN3
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类写好了,下面是在JSP中如下调用。 iM6(bmc.
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<% $jv"$0Fc
CountBean cb=new CountBean(); <HIM
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ]<r.{EJ
CountCache.add(cb); ta
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out.print(CountCache.list.size()+"<br>"); ?[Ma" l>
CountControl c=new CountControl(); F2EX7Crj
c.run(); ?32i1F!
out.print(CountCache.list.size()+"<br>"); \C$cbI=;+
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