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: O@-(fyG
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CountBean.java LNF|mS\+D
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/* x,#?
* CountData.java -S
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* qjf9ZD&
* Created on 2007年1月1日, 下午4:44 gF r-P! 3
* XT{ukEvDR
* To change this template, choose Tools | Options and locate the template under bkIQ?cl<at
* the Source Creation and Management node. Right-click the template and choose N9=?IFEe]
* Open. You can then make changes to the template in the Source Editor. #Wely~
*/ dQ_yb+<
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package com.tot.count; #%.fsJNA$
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/** \{a 64
* 7a4h7/
* @author 0t -=*7w%
*/ Ummoph7_@
public class CountBean { 0>U7]wZKc
private String countType; J@o$V- KK
int countId; }=s64O9j
/** Creates a new instance of CountData */ >44,Dp]
public CountBean() {} <O4W!UVg
public void setCountType(String countTypes){ 8 G:f[\^
this.countType=countTypes; U\(T<WX,
} zUz j
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public void setCountId(int countIds){ >?r8D48`
this.countId=countIds; MmD1@fW32#
} zj7?2
public String getCountType(){ PPj%.i)
return countType; #>O+!IH
} f|&,SI ?
public int getCountId(){ D9higsN
return countId; 2t:CK
} ?d@zTAI
} '%KaAi$
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CountCache.java PG3,MCf:
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/* ,`ju(ac!
* CountCache.java zc5>)v LH=
* %KW NY(m
* Created on 2007年1月1日, 下午5:01 ONm-zRx|
* 6U%F
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* To change this template, choose Tools | Options and locate the template under +lw*/\7
* the Source Creation and Management node. Right-click the template and choose ETrL3W<
* Open. You can then make changes to the template in the Source Editor. GUUd(xS{
*/ ]TSzT"_r~~
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package com.tot.count; @8U8> 'zDE
import java.util.*; <E\vc6n
/** yrFl,/8&G
* q;9OqArq
* @author "~6IjW*/
*/ RBV*e9P%
public class CountCache { TQ25"bWi
public static LinkedList list=new LinkedList(); 0EBHRY_F
/** Creates a new instance of CountCache */ eD0|6P;Ei
public CountCache() {} xv0y?#`z
public static void add(CountBean cb){ P7
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if(cb!=null){ Q=F^Y f
list.add(cb); iB3C.wd-
} -[xbGSj{
} /gq\.+'{
} </23*n]
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CountControl.java `2@f=$B
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/* |!*abc\`(`
* CountThread.java mjJ/rx{kbw
* xOdLct
* Created on 2007年1月1日, 下午4:57 &-p!Lg&D
* `l+9g"q
* To change this template, choose Tools | Options and locate the template under |]tsf
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* the Source Creation and Management node. Right-click the template and choose \Vl)q>K_h
* Open. You can then make changes to the template in the Source Editor. t9[%o=N~lD
*/ QA#
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package com.tot.count; vfOG(EkG.?
import tot.db.DBUtils; T,5(JP(h3
import java.sql.*; *DPKV$
/** m";?B1%x
* :}[D;cx
* @author PvVn}i
*/ XseP[
public class CountControl{ .MW/XnCYs4
private static long lastExecuteTime=0;//上次更新时间 s|-g)
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 GW!%DT
/** Creates a new instance of CountThread */ &ej|DM6
public CountControl() {} 884 -\M"h
public synchronized void executeUpdate(){ ms/Q-
Connection conn=null; %^(} fu
PreparedStatement ps=null;
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try{ h#]LXs
conn = DBUtils.getConnection(); \\$wg
conn.setAutoCommit(false); K"g`,G6S
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); JVh/<A
for(int i=0;i<CountCache.list.size();i++){ !=(M P:
CountBean cb=(CountBean)CountCache.list.getFirst(); .
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CountCache.list.removeFirst(); e\ O&Xe
ps.setInt(1, cb.getCountId()); js)I%Z
ps.executeUpdate();⑴ {z7kW@c
//ps.addBatch();⑵ G|)fZQ1nS
} _>i<` k
//int [] counts = ps.executeBatch();⑶ ?oQAxb&
conn.commit(); MTeCmFe0;
}catch(Exception e){ 7hfa?Mcz
e.printStackTrace(); R1C2d +L
} finally{ bVYsPS
try{ I8LoXY
if(ps!=null) { x}H%NzR
ps.clearParameters(); m9Hdg^L
ps.close(); 77~l~EX
ps=null; ?CZ*MMV
}
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}catch(SQLException e){} KAm$^N5
DBUtils.closeConnection(conn); x*0mmlCb
} BnIZ+fg=
} +V/m V7FK
public long getLast(){ lv\^@9r
return lastExecuteTime; ]M/*Beh
} J3AS"+]
public void run(){ l&6+ykQ
long now = System.currentTimeMillis(); tk'3Q 1L
if ((now - lastExecuteTime) > executeSep) { G?v]|wdI
//System.out.print("lastExecuteTime:"+lastExecuteTime); q{RT~,%
//System.out.print(" now:"+now+"\n"); o3>D~9
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); CUa`#
lastExecuteTime=now; 6cbIs_g
executeUpdate(); a~O](/+p;
} E]%&)3O[
else{ DK }1T
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 02~GT_)$^
} 99&PY[f:{
} MI*@^{G
} T.iVY5^<
//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 z)&GF$*
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类写好了,下面是在JSP中如下调用。 #{suH7
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<% :qO)^~x
CountBean cb=new CountBean(); =.f<"P51k
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); cKH By
CountCache.add(cb); O
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out.print(CountCache.list.size()+"<br>"); =-8y=
CountControl c=new CountControl(); )GF>]|CG
c.run(); {^SHIL
out.print(CountCache.list.size()+"<br>"); YOY{f:ew
%>