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: ^Ze(WE)
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CountBean.java gnGh )
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/* jEE!H/
* CountData.java 8_E(.]U
* twu,yC!
* Created on 2007年1月1日, 下午4:44 XG*> yra`
* qyxd9Lk1
* To change this template, choose Tools | Options and locate the template under t7xJ$^p[|K
* the Source Creation and Management node. Right-click the template and choose m_;fj~m
* Open. You can then make changes to the template in the Source Editor. O,Tp,wT
*/ ==
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package com.tot.count; HUMy\u84H
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/** u]Q}jqiq"
* +;\w'dBi,
* @author SXP(C^?C
*/ sE'c$H
public class CountBean { a{L&RRJ
private String countType; &XV9_{Hm
int countId; I-}ms
/** Creates a new instance of CountData */ U3C"o|
public CountBean() {} S]ayH$w\Q
public void setCountType(String countTypes){ N,Z*d
this.countType=countTypes; 4 ob?M:S
} P6Y+ u
public void setCountId(int countIds){ .^M#BAt2
this.countId=countIds; o">~ObR
} M(nzJ
public String getCountType(){ I`(53LCqo
return countType; `Th~r&GvF
} OPzudO
public int getCountId(){ 4D2U,Ds
return countId; bf@g*~h@
} Z1jxu;O(
} f=k#o2
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CountCache.java EcL6lNTR+
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/* `kJ)E;v;3
* CountCache.java ]\KVA)\
* ^8EW/$k
* Created on 2007年1月1日, 下午5:01 <$yA*
* `u}_O(A1pA
* To change this template, choose Tools | Options and locate the template under Ufl\
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* the Source Creation and Management node. Right-click the template and choose {ZrlbDQX
* Open. You can then make changes to the template in the Source Editor. I5q$QQK
*/ "T_9_6tH
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package com.tot.count; YnuY/zDF
import java.util.*; U+*l!"O,
/** VsJ+-IHm
* ~N i
* @author z]r'8Jc
*/ MOK}:^bSu
public class CountCache { O-HS)g$2
public static LinkedList list=new LinkedList(); D
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/** Creates a new instance of CountCache */ }3A~ek#*~
public CountCache() {} \HbZ~I-
public static void add(CountBean cb){ U+qyS|i
if(cb!=null){ bS;_xDXd
list.add(cb); McN[
} g=[OH
} =]]1x_GB
} ]}PXN1(
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CountControl.java ;YR/7
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/*
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* CountThread.java LT<2 n.S
* >#$SaG!
* Created on 2007年1月1日, 下午4:57 Ij7P-5=<
* e,epKtL
* To change this template, choose Tools | Options and locate the template under VS/M@y_./
* the Source Creation and Management node. Right-click the template and choose ']TWWwj$
* Open. You can then make changes to the template in the Source Editor. cN0
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*/ 1R3,Z8j'
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package com.tot.count; ru@#s2
import tot.db.DBUtils; PkrVQH9^w
import java.sql.*; 9:4S[mz/hD
/** w.w{L=p:<"
* x)*Lu">
* @author 6w7;
*/ /^AH/,p
public class CountControl{ B;eka[xU
private static long lastExecuteTime=0;//上次更新时间 7JGc9K+Av
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ppRmC,0f^
/** Creates a new instance of CountThread */ g5@JA^\vZT
public CountControl() {} 4WvW11q8U
public synchronized void executeUpdate(){ @>Yd6C
Connection conn=null; #0r~/gW
PreparedStatement ps=null; Rb L?(
try{ ,Q56A#Y\
conn = DBUtils.getConnection(); @KK6Jy OTQ
conn.setAutoCommit(false); U}5fjY
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =}#yi<Lt
for(int i=0;i<CountCache.list.size();i++){ JY2<ECO
CountBean cb=(CountBean)CountCache.list.getFirst(); T4]2R
CountCache.list.removeFirst(); F*[E28ia&
ps.setInt(1, cb.getCountId()); qg& /!\
ps.executeUpdate();⑴ #zTy7ZS,0
//ps.addBatch();⑵ a*y9@RC}
} 86OrJdD8
//int [] counts = ps.executeBatch();⑶ U;#KFZ+~
conn.commit(); &Gjpc>d
}catch(Exception e){ > O?WRCB
e.printStackTrace(); `Y:]&w
} finally{ 5P\>$N1p
try{ w\acgQ^%e
if(ps!=null) { iT
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ps.clearParameters(); Z?{\34lPj
ps.close(); ot<d
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ps=null; p[JIH~nb
} AOZ C D{
}catch(SQLException e){} DLrV{8%W
DBUtils.closeConnection(conn); E xhih^[_
} >`0U2K
} \W.CHSD
public long getLast(){ 2 {&A)Z!I
return lastExecuteTime; rP4T;Clout
} @4*:qj?
public void run(){ U`qkeNd
long now = System.currentTimeMillis(); d5l42^Z
if ((now - lastExecuteTime) > executeSep) { p
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//System.out.print("lastExecuteTime:"+lastExecuteTime); Uw("+[ 5O0
//System.out.print(" now:"+now+"\n"); M!J7Vj?Ps
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); +
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lastExecuteTime=now; ri{*\LV*@
executeUpdate(); TI DgIK
} vW=-RTRH
else{ Qp:I[:Lr;
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); h.X4x2(.
} Jj\4P1|' 7
} 9(^UchZZi
} H7X-\K 1w
//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 $\BYN=#
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类写好了,下面是在JSP中如下调用。 <2U@O`
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{ KWVPeh
<% 6Cj7 =|L7
CountBean cb=new CountBean();
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 23):OB>S`
CountCache.add(cb); 'Tm1Mh0Fso
out.print(CountCache.list.size()+"<br>"); ,GH`tK_
CountControl c=new CountControl(); n{;Q"\*Sg
c.run(); J#..xJ?XRD
out.print(CountCache.list.size()+"<br>"); ;\*3A22 #
%>