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: qrM{b=
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CountBean.java #.MIW*==
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/* ?HEtrX,q
* CountData.java p;n3`aVh
* XC7Ty'#"KX
* Created on 2007年1月1日, 下午4:44 l?@MUsg+
* +9 16ZPk
* To change this template, choose Tools | Options and locate the template under qUEd
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* the Source Creation and Management node. Right-click the template and choose iJdrY6qd
* Open. You can then make changes to the template in the Source Editor. EG(`E9DZ
*/ _Qm7x>NT4
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package com.tot.count; OXIu>jF
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/** _>jrlIfc
* ;9p#xW6
* @author i3M?D}(Bs
*/ ]uStn
public class CountBean { U!a!|s>
private String countType; As6)_8w
int countId; r3[t<xlFf
/** Creates a new instance of CountData */ r}_Lb.1]
public CountBean() {} ;l/}Or2
public void setCountType(String countTypes){ +K$5tT6b
this.countType=countTypes; M9(ez7Z
} {.aK{
V
public void setCountId(int countIds){ JK(`6qB>(6
this.countId=countIds; up+.@h{
} ?dJ/)3I%F
public String getCountType(){ &prdlh=UE
return countType; V5e \%
} C}(<PNT
public int getCountId(){ zqekkR]
return countId; ]ZR{D7.?
} o;M.Rt\A
} |n|U;|'^
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CountCache.java 5T$9'5V7
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/* Qm35{^p+
* CountCache.java G|QUujl
* #L@} .Giz
* Created on 2007年1月1日, 下午5:01 pW*{Mx
* vi[#?;pkF
* To change this template, choose Tools | Options and locate the template under g{g`YvLu^
* the Source Creation and Management node. Right-click the template and choose gZ`32fB%
* Open. You can then make changes to the template in the Source Editor. RsqRR`|X?
*/ !q~X*ZKse
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package com.tot.count; *1|YLy
import java.util.*; x38SSzG:L
/**
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* >u9id>+
* @author LPq*ZZK
*/ ?r
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public class CountCache { +Fc ET
public static LinkedList list=new LinkedList(); ~
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/** Creates a new instance of CountCache */ 3o+KP[A
public CountCache() {} HZQDe&
public static void add(CountBean cb){ Hk<X
if(cb!=null){ d'N(w7-Y
list.add(cb); fs2mN1
} XPHQAo[(s
} r.^0!(d
} 90
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CountControl.java 763E 6,7
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/* w8AJ#9W
* CountThread.java wb(*7 &eP:
* o|z+!,
* Created on 2007年1月1日, 下午4:57 ^?$D.^g
* & cM
u/ }
* To change this template, choose Tools | Options and locate the template under l 8O"w&
* the Source Creation and Management node. Right-click the template and choose :3111}>c
* Open. You can then make changes to the template in the Source Editor. -kG3k> by_
*/ h|J;6Sm@
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package com.tot.count; qiG]nCq
import tot.db.DBUtils; %/{IssCR7
import java.sql.*; a(PjcQ4dY
/** ePV-yy
* G*kE~s9R
* @author bWGyLo,
*/ 6@"Vqm|HD
public class CountControl{ Si#"Wn?|
private static long lastExecuteTime=0;//上次更新时间 o\_
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %iK%$
/** Creates a new instance of CountThread */ Pk$}%;@v
public CountControl() {} W0VA'W
public synchronized void executeUpdate(){ kVV\*"9y
Connection conn=null; fC=fJZU7$
PreparedStatement ps=null; Jz~+J*r;]A
try{ kmZ.U>#
conn = DBUtils.getConnection(); +\+Uz!YS
conn.setAutoCommit(false); th5,HO~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *e(:["v
for(int i=0;i<CountCache.list.size();i++){ Iv'RLM
CountBean cb=(CountBean)CountCache.list.getFirst(); NY4!TOp
CountCache.list.removeFirst(); NzjMk4t
ps.setInt(1, cb.getCountId()); lr9=OlH
ps.executeUpdate();⑴ gJ]Cq/gC
//ps.addBatch();⑵ DBQOxryP>o
} 5."5IjZu
//int [] counts = ps.executeBatch();⑶ {F;,7Kn+l
conn.commit(); X}3P1.n:
}catch(Exception e){ l'|E,N>X
e.printStackTrace(); \BN|?r$a
} finally{ wY' "ab
try{ M%7`8KQ
if(ps!=null) { eeZIa`.sX
ps.clearParameters(); 3CA|5A.Pa
ps.close(); p@#]mVJ>9
ps=null; !nec 7
} gE\A9L~b
}catch(SQLException e){} IM@"AD52a
DBUtils.closeConnection(conn); 7sj<|g<h(_
} U5|B9%:&
} G1kDM.L
public long getLast(){ `-~`<#E[
return lastExecuteTime; x}v1X`6b
} &J\B\`
public void run(){ 3Z_t%J5QZ$
long now = System.currentTimeMillis(); [_j6cj]
if ((now - lastExecuteTime) > executeSep) { :9(3h"
//System.out.print("lastExecuteTime:"+lastExecuteTime); 6,B-:{{e"
//System.out.print(" now:"+now+"\n"); ?lF mXZy`
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 0('OyH)
lastExecuteTime=now; aL88E
executeUpdate(); \s,Iz[0Vfz
} f_oq1 W)9
else{ 3}08RU7[!
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); F;pTXt}?5
} yPSVwe|g
} 66/Z\H^d
} x:p}w[WM
//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 DP|TIt ,Rl
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类写好了,下面是在JSP中如下调用。 ,oBlJvm
:aHcPc:
<% DLU[<!C
CountBean cb=new CountBean(); VK9Q?nu
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); JRD8Lz]Q3
CountCache.add(cb); Ud$Q0m&
out.print(CountCache.list.size()+"<br>"); ])eOa%
CountControl c=new CountControl(); DG3[^B
c.run(); D`en%Lf!m
out.print(CountCache.list.size()+"<br>"); |pBMrN+is
%>