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: Q>ytO'v1
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CountBean.java sdD[`#
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/* Yk?q7xuT
* CountData.java ^W'[l al.
* 0&@pX~h:
* Created on 2007年1月1日, 下午4:44 %/zZ~WIf
* I!D*( >
* To change this template, choose Tools | Options and locate the template under =rF8[Q0K
* the Source Creation and Management node. Right-click the template and choose R?s\0
* Open. You can then make changes to the template in the Source Editor. V p{5Kxq
*/ Ghc0{M<
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package com.tot.count; 2A+,. S_!x
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/** &J:)*EjVl5
* S I5QdX
* @author YYW70k:
*/ n`xh/vGm#
public class CountBean { |vzWSm
private String countType; nUHVPuQ/'T
int countId; w}q"y+=Z:
/** Creates a new instance of CountData */ 4&fnu/,Z
public CountBean() {} [hbp#I~*[
public void setCountType(String countTypes){ l.l~K%P'h
this.countType=countTypes; /
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} G. TX1
public void setCountId(int countIds){ |0p'p$%
this.countId=countIds; *pp1Wa7O
} n^#LB*q
public String getCountType(){ |pSoBA9U
return countType; f@L{*Upj+
} F9r*ZyNlx
public int getCountId(){ 7:'>~>'
return countId; 5&=n
} Ypj)6d
} c@M@t0WT[
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CountCache.java y/eX(l<{
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/* HYmXPpse
* CountCache.java S]O Hv6
* uf]$@6)
* Created on 2007年1月1日, 下午5:01 Qe.kNdT+_
* :exuTn
* To change this template, choose Tools | Options and locate the template under e}AJxBE
* the Source Creation and Management node. Right-click the template and choose >irT|VTf
* Open. You can then make changes to the template in the Source Editor. j],.`Y
*/ t'x:fO?cp
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package com.tot.count; F*:NKT d
import java.util.*; rd4'y~#S
/** 9Ib(x0_
* :=v{inN
* @author
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*/ {
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public class CountCache { ^|(4j_.(e
public static LinkedList list=new LinkedList(); ?u!AHSr(
/** Creates a new instance of CountCache */ ~(^*?(Z
public CountCache() {} ^QR'yt3e
public static void add(CountBean cb){ 8w?\_P7QA
if(cb!=null){ v};qMceJ
list.add(cb); _rd j,F8
} 1t=X: ]0j
} v1g5(
} C?|3\@7
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CountControl.java JM lhBh
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/* ~<OjXuYu
* CountThread.java >=:T
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* qpqz. {\
* Created on 2007年1月1日, 下午4:57 UZXcKl>u
* G2{ M#H
* To change this template, choose Tools | Options and locate the template under nYt\e]3
* the Source Creation and Management node. Right-click the template and choose )\\V
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* Open. You can then make changes to the template in the Source Editor. ^J~A+CEf"W
*/ 7 P^{*!
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package com.tot.count; W)msaq,
import tot.db.DBUtils; =C>`}%XT}
import java.sql.*; jNG?2/P6&
/** #IGoz|m
* 3]OP9!\6
* @author 7h#faOP
*/ 'S4EKV]
public class CountControl{ /,N!g_"Z
private static long lastExecuteTime=0;//上次更新时间 <*Kh=v
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %i
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/** Creates a new instance of CountThread */ 6`baQ!xc.
public CountControl() {} ~73i^3yf
public synchronized void executeUpdate(){ 0ij~e<
Connection conn=null; _Z66[T+M
PreparedStatement ps=null; Zjic"E1
try{ ml33qXW:
conn = DBUtils.getConnection(); ?}3PJVy?
conn.setAutoCommit(false); .4C[D{4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); q?-3^z%u
for(int i=0;i<CountCache.list.size();i++){ hp]ng!I{\u
CountBean cb=(CountBean)CountCache.list.getFirst(); Z~phOv
CountCache.list.removeFirst(); kuj12
ps.setInt(1, cb.getCountId()); ,*nZf|
ps.executeUpdate();⑴ [X">vaa
//ps.addBatch();⑵ QTjftcu
} ?%xhe
//int [] counts = ps.executeBatch();⑶ m,gy9$
conn.commit(); W93JY0Ls9|
}catch(Exception e){ :ONuWNY
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e.printStackTrace(); s\Pt,I@Y_
} finally{
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try{ x*R8^BA]pR
if(ps!=null) { a?,[w'7FU
ps.clearParameters();
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ps.close(); 7moElh v
ps=null; [UJEU~XC
} N$,/Q9h^
}catch(SQLException e){} Od!F: <
DBUtils.closeConnection(conn); iJZ|[jEDV
} (3N"oE.b]
} ||=[kjG~
public long getLast(){ W%>i$:Qq
return lastExecuteTime; =CKuiO.j
} $W/+nmb)@K
public void run(){ y^d[( c
long now = System.currentTimeMillis(); xI@$aTGq
if ((now - lastExecuteTime) > executeSep) { ljYpMv.>xG
//System.out.print("lastExecuteTime:"+lastExecuteTime); b'7z DZI]
//System.out.print(" now:"+now+"\n"); .|-l+
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 8R\>FNk;
lastExecuteTime=now; SLdN.4idK
executeUpdate(); +HOCVqx
} f2O*8^^Y{Q
else{ U/X|i /
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); .# 6n
} Q%& _On
} G`]v_`>
} =% q?Cr
//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 ceFsGdS
1p7cv~#95
类写好了,下面是在JSP中如下调用。 n5Nan
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<% *GbVMW[A>
CountBean cb=new CountBean(); )-+\M_JK5
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); .3lGX`d{
CountCache.add(cb); N5 SLF4R1
out.print(CountCache.list.size()+"<br>"); I 1 b
CountControl c=new CountControl(); Hp)X^O"
c.run(); w]>"'o{{
out.print(CountCache.list.size()+"<br>"); 4M @oj
%>