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: HXT"&c|
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CountBean.java 3:xx:Jt
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/* gd
* b0(
* CountData.java lZRO"[<
* 3U^Vz9LW
* Created on 2007年1月1日, 下午4:44 j~Pwt9G
* [<,7LG<
* To change this template, choose Tools | Options and locate the template under DX! dU'tj
* the Source Creation and Management node. Right-click the template and choose Ra5 3M!>]
* Open. You can then make changes to the template in the Source Editor. d;>G
*/ 47(_5PFb#
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package com.tot.count; -
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/** B~]6[Z
* $,:mq>]![{
* @author dBA&NW07
*/ ,gk'8]
public class CountBean { A5F(-
private String countType; hpXW tQ
int countId; |_ED*ATR=
/** Creates a new instance of CountData */
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public CountBean() {} 1c QF(j_
public void setCountType(String countTypes){ .aO6Y+Y
this.countType=countTypes; yKUxjb^b\
} {HY3E}YJL
public void setCountId(int countIds){ <ot`0
this.countId=countIds; [*O>Lk
} muXP5MO
public String getCountType(){ %r.OV_04
return countType; ?ch?q~e)
} r'nPP6`
public int getCountId(){ pf'DbY!
return countId; -zYa@PW
} e46`"}r
} |BM#r fQ
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CountCache.java Lk]|;F-2i
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/* ,j>FCj>
* CountCache.java @7"n X
* 9=$pV==
* Created on 2007年1月1日, 下午5:01 5cf?u3r!qJ
* h0m5oV
* To change this template, choose Tools | Options and locate the template under 6 8n ;#-X
* the Source Creation and Management node. Right-click the template and choose 7]Qxt%7/>
* Open. You can then make changes to the template in the Source Editor. [)}P{y
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*/ jA {BG_
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package com.tot.count; ':}9>B3 S
import java.util.*; h/A\QW8Sd
/** b]?5r)GK
* C3^3<
* @author } *)l
*/ &Y@),S9
public class CountCache { SVwxK/Fci
public static LinkedList list=new LinkedList(); DM v;\E~D
/** Creates a new instance of CountCache */ zmZU"eWp)
public CountCache() {} p:b{>lM
public static void add(CountBean cb){ qF^P\cD
if(cb!=null){ HOu$14g
list.add(cb); k@%5P-e}
} $- ]G6r
} .9Oj+:n
} d, g~.iS~
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CountControl.java }R}M>^(R4
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/* O[$X36z
* CountThread.java n~
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* aC=2v7*
* Created on 2007年1月1日, 下午4:57 !Z>,dN
* #tUhul/O
* To change this template, choose Tools | Options and locate the template under bA0H
* the Source Creation and Management node. Right-click the template and choose ORKJy)*"
* Open. You can then make changes to the template in the Source Editor. 9$U>St
*/ .<%q9Jy#
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package com.tot.count; F$4=7Njv
import tot.db.DBUtils; h&i(Kfv*
import java.sql.*; FZU1WBNL%t
/** X&aQR[X
* FTEC=j$ln
* @author /g*_dH)=
*/ Ux?G:LLz
public class CountControl{ ^F?B_'
private static long lastExecuteTime=0;//上次更新时间 x&u@!# d]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 7>@0nHec
/** Creates a new instance of CountThread */ 20$Tky_
public CountControl() {} ik?IC$*n3i
public synchronized void executeUpdate(){ ^y ', l
Connection conn=null; Ow1+zltgj-
PreparedStatement ps=null; "i&n;8?Y
try{ K)l*$h&-
conn = DBUtils.getConnection(); r
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conn.setAutoCommit(false); ?nu<)~r53
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); J
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for(int i=0;i<CountCache.list.size();i++){ LjGLi>kI~
CountBean cb=(CountBean)CountCache.list.getFirst(); GCQOjqiR
CountCache.list.removeFirst(); cEp/qzAiD%
ps.setInt(1, cb.getCountId()); w=-{njMz6&
ps.executeUpdate();⑴ OAo03KW
//ps.addBatch();⑵
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} \Qv:7;?
//int [] counts = ps.executeBatch();⑶ WSeiW
conn.commit(); &q4~WRnzJk
}catch(Exception e){ .
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e.printStackTrace(); [`h,Ti!m<
} finally{ 8 rE`
try{ bg9_$laDi
if(ps!=null) { dUn]aS
ps.clearParameters(); O.Dz}[w
ps.close(); bZK`]L[
ps=null; %NlmLWF.
} *a_QuEw_k
}catch(SQLException e){} .'+JA:3R
DBUtils.closeConnection(conn); Z$Ps_Ik
} cbou1Ei
} uVZm9Sp
public long getLast(){ JKp@fQT *
return lastExecuteTime; ?JRfhJ:j
} 4u|6^wu.I
public void run(){ >4>.
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long now = System.currentTimeMillis(); [KO\!u|?YS
if ((now - lastExecuteTime) > executeSep) { |%X_<Cpk
//System.out.print("lastExecuteTime:"+lastExecuteTime); ss|n7
//System.out.print(" now:"+now+"\n"); )"P.n-aF
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Tnf&32IA
lastExecuteTime=now; wN0?~
executeUpdate(); kz#x6NXj
} e6gj'GmY
else{ 9p02K@wkD
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); A1zV5-E/
} o'P[uB/
} *"/BD=INv}
} 9<!??'@f
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 m`XaY J
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类写好了,下面是在JSP中如下调用。 fB; o3!y
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<% 9%P$e=Ui#
CountBean cb=new CountBean(); '+^XL6$L
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 8fWnKWbbjw
CountCache.add(cb); blbzh';0}
out.print(CountCache.list.size()+"<br>"); 'i/"D8
CountControl c=new CountControl(); nM$-L.dG
c.run(); @M }`nKXM
out.print(CountCache.list.size()+"<br>"); u*Y!=IT
%>