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: wKAxUPzm
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CountBean.java xO;Qr.3PX
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/* PsI{y&.
* CountData.java wbh^ZMQ
* seNH/pRb
* Created on 2007年1月1日, 下午4:44 IYB;X
* _H$Z}2g<z
* To change this template, choose Tools | Options and locate the template under ~D!Y]
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* the Source Creation and Management node. Right-click the template and choose 8iN@n8O
* Open. You can then make changes to the template in the Source Editor. ,pVq/1
*/ +fG~m:E
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package com.tot.count; "nC=.5/$
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/** r }Nq"s<
* wI2fCq(a0
* @author 2Q[q)u
*/ `}*jjnr"
public class CountBean { vjYG>YhV
private String countType; 8rSu,&<
int countId; d4A3DTW
/** Creates a new instance of CountData */ l u V_
public CountBean() {} FSS~E [(DL
public void setCountType(String countTypes){ J*]JH{
this.countType=countTypes; E1Rz<&L
} ;V)94YT
public void setCountId(int countIds){ 0coRar?+b
this.countId=countIds; d(6&kXK
} zK&J2P`
public String getCountType(){ f9J]-#I if
return countType; l[{Ci|4
} o)Nm5g
public int getCountId(){ 5C"A*Fg?;
return countId; 2T}FX4'
} *mfPq"/
} Aq{7WA
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CountCache.java ceNJXK
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/* K<7 Db4H
* CountCache.java rYk
* uCGn9]
* Created on 2007年1月1日, 下午5:01 jX
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* q<?r5H5
* To change this template, choose Tools | Options and locate the template under T!gq
Z
* the Source Creation and Management node. Right-click the template and choose ^HNccr
* Open. You can then make changes to the template in the Source Editor. 0vdnM8N2
*/ *Y- rEF >
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package com.tot.count; w}Xy;0c
import java.util.*; ;X[23A{
/** w0$l3^}z
* X>VxE/
* @author K2t|d[r
*/ [:-o;K\.-a
public class CountCache { -Khb
public static LinkedList list=new LinkedList(); 'C\knQ
/** Creates a new instance of CountCache */ LQ=Fck~[r
public CountCache() {} "=XRonQZ
public static void add(CountBean cb){ -xc'P,`
if(cb!=null){ Q4&<RWbT^
list.add(cb); ^W<uc :L7
} |Xa|%f
} K6z-brvw"
} VWcR@/3
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CountControl.java E9n7P'8
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/* ^tFgkzXm
* CountThread.java YM]ZL,8
* NpF}~$2
* Created on 2007年1月1日, 下午4:57 A49HYX-l
* O8S"B6?$~'
* To change this template, choose Tools | Options and locate the template under j8#B
* the Source Creation and Management node. Right-click the template and choose >l|dLyiae
* Open. You can then make changes to the template in the Source Editor. YfOO]{x,X
*/ O{`r.H1',
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package com.tot.count; vt-53fa|
import tot.db.DBUtils; b-,]21
import java.sql.*; F6\r"63
/** 'aW<C>
* E>6:59+
* @author e8<[2J)P&
*/ z hFk84
public class CountControl{ BFyVq
private static long lastExecuteTime=0;//上次更新时间 $2\k| @)s
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 YC0FXN V
/** Creates a new instance of CountThread */ *FEY"W+bY
public CountControl() {} 9Fm><,0'u
public synchronized void executeUpdate(){
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Connection conn=null; .]W A/}
PreparedStatement ps=null; Uw5`zl
try{ ^YG.eT6iG
conn = DBUtils.getConnection(); Ws(#ThA
conn.setAutoCommit(false); 3Q"4-pd
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S[W|=(f9
for(int i=0;i<CountCache.list.size();i++){ K# dV.
CountBean cb=(CountBean)CountCache.list.getFirst(); 0q
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CountCache.list.removeFirst(); +R?d6IjH
ps.setInt(1, cb.getCountId()); _K"X
ps.executeUpdate();⑴ Dx<CO1%z-
//ps.addBatch();⑵ :X;AmLf`2u
} /IN/SZx
//int [] counts = ps.executeBatch();⑶ sd~T
conn.commit(); =!%+ sem
}catch(Exception e){ /K]<7
e.printStackTrace(); oZ(T`5
} finally{ {|J'd+
try{ E64d6z^7u
if(ps!=null) { /^z5;aG
ps.clearParameters(); wFJ?u?b0Q
ps.close(); lfp'D+#p{
ps=null; h&6v&%S/L
} *m[ow s
}catch(SQLException e){} <C9_5Ce~
DBUtils.closeConnection(conn); 8L7ZWw
d
} #7A_p8
} hup<U+p
public long getLast(){ zbDM+;
return lastExecuteTime; '
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} Gp/yr
public void run(){ q={\|j$X
long now = System.currentTimeMillis(); 8?rRLM4
if ((now - lastExecuteTime) > executeSep) { *0`oFTJ
//System.out.print("lastExecuteTime:"+lastExecuteTime); r%/*,lLO
//System.out.print(" now:"+now+"\n"); H]7;OM/g
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 3yfq*\_uXw
lastExecuteTime=now; a jCx"J
executeUpdate(); ^#4?v^QNh
} ?#LbhO*
else{ g qRwN p
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); )R2BTE:
} kt; |
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} (fjAsbT
} 93npzpge
//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
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# N.(ZP
类写好了,下面是在JSP中如下调用。 a!>yX
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<% bVc;XZwI
CountBean cb=new CountBean(); |&t 2jD(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ui:
CountCache.add(cb); \&p MF
out.print(CountCache.list.size()+"<br>"); oiq7I@Y`x
CountControl c=new CountControl(); j:9kJq>mv
c.run(); < g<Lf[n$
out.print(CountCache.list.size()+"<br>"); |QvG;{!
%>