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: q1U&vZ3]c
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CountBean.java f-vZ2+HP
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/* wy,Jw3
* CountData.java J"/JRn
* 5dg-d\6S
* Created on 2007年1月1日, 下午4:44 |P^]@om
* B jH ~Ml2
* To change this template, choose Tools | Options and locate the template under =Dh$yC-Zr
* the Source Creation and Management node. Right-click the template and choose M4zX*&w.T
* Open. You can then make changes to the template in the Source Editor. 44'=;/
*/ n33JTqX
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package com.tot.count; [B}1z
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/** [SCw<<l<
* hO^&0?
* @author 0\?_lT2
*/ Aqa6R+c
public class CountBean { &sI,8X2a2
private String countType; H(X+.R,Thp
int countId; ]jHgo](%
/** Creates a new instance of CountData */ ,:v.L}+Z
public CountBean() {} H @_eFlT t
public void setCountType(String countTypes){ q,<n,0)K
this.countType=countTypes; l4iuu
} W2}%zux
public void setCountId(int countIds){ aEcktg6h
this.countId=countIds; i!CKA}",
} &_<VZS
public String getCountType(){ B0-4ZT
return countType; ."~7 \E> t
} lAdOC5+JX
public int getCountId(){ t7{L[C$
return countId; _ff=B
} DCEvr" (
} a"`g"ZRx
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CountCache.java /W"Bf
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/* (Wm/$P;
* CountCache.java d%}crM-KTL
* r4;5b s6wm
* Created on 2007年1月1日, 下午5:01 gGtep*k
* YH/S2 D
* To change this template, choose Tools | Options and locate the template under 1Pud,!\%q
* the Source Creation and Management node. Right-click the template and choose pieU|?fQ
* Open. You can then make changes to the template in the Source Editor. p<Zs*
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*/ el <<D
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package com.tot.count; n.2E8m/
import java.util.*; 3v9gb,)y\
/** tb-OKZq
* uB5h9&57
* @author S1}1"y/
*/ m&Y;/kr
public class CountCache { 8CHb~m@^$
public static LinkedList list=new LinkedList(); jw:4fb
/** Creates a new instance of CountCache */ "/4s8.dw+u
public CountCache() {} #,f}lV,&
public static void add(CountBean cb){ *kX3sG$8
if(cb!=null){ w?V[[$
list.add(cb); p/\$P=
} JLy)}8I
} 7h9 fQ&y
} v$gMLu=
% j[O&[s}
CountControl.java hRuo,FS#:
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/* "TBQNWZ
* CountThread.java xZ9}8*Q&:
* :GwSs'$O
* Created on 2007年1月1日, 下午4:57 2a._?(k_y
* jMz1s%C
* To change this template, choose Tools | Options and locate the template under 68&6J's;
* the Source Creation and Management node. Right-click the template and choose l5\B2 +}7
* Open. You can then make changes to the template in the Source Editor. b'Fx),
*/ (ybtXoQs
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package com.tot.count; 2FZ0c/[&
import tot.db.DBUtils; [a>JG8[,t
import java.sql.*; }}sRTW
/** !7IT~pO`
* #a7Amh\nT
* @author }#\;np
*/ "Cyo<|
public class CountControl{ E6k?+i
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private static long lastExecuteTime=0;//上次更新时间 -!C
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 M5cOz|j/*R
/** Creates a new instance of CountThread */ `_ J^g&y~
public CountControl() {} $L<_uqSk
public synchronized void executeUpdate(){ I{?E /Sc
Connection conn=null; 7"a`-]Ap
PreparedStatement ps=null; G*vpf~q?
try{ p:[`%<j0
conn = DBUtils.getConnection(); ?BHWzo!
conn.setAutoCommit(false); <FcPxZ
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); *f0.= ?
for(int i=0;i<CountCache.list.size();i++){ IS0HV$OI
CountBean cb=(CountBean)CountCache.list.getFirst(); h30QCk
CountCache.list.removeFirst(); w+).pcG(*
ps.setInt(1, cb.getCountId()); NgE&KPj\
ps.executeUpdate();⑴ F(KH-
//ps.addBatch();⑵ SCfkv|hO
} xu%!
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//int [] counts = ps.executeBatch();⑶ [}9XHhY1O=
conn.commit(); <\}Y@g8
}catch(Exception e){ fcE/
e.printStackTrace(); .UT,lqEkv
} finally{ <iXS0k
try{ b2}QoJ@`
if(ps!=null) { `L"p)5H
ps.clearParameters(); ga{25q}"
ps.close(); :"<B@Z
ps=null; Ry8WNVO}R
} d}wa[WRv
}catch(SQLException e){} ~q8V<@?
DBUtils.closeConnection(conn); Zv1Bju*y
} 8aZey_Hw;+
} sO{0hZkc
public long getLast(){ -_{C+Y_
return lastExecuteTime; l$p_])x
} 7?Qt2tr
public void run(){ h87L8qh9
long now = System.currentTimeMillis(); h-2E9Z
if ((now - lastExecuteTime) > executeSep) { pE(<XD3Q
//System.out.print("lastExecuteTime:"+lastExecuteTime); L6rs9su=7
//System.out.print(" now:"+now+"\n"); {x&jh|f`g
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); *&hXJJ[+
lastExecuteTime=now; w}U5dM`
executeUpdate(); (AM,4)lW,
} .kB3jfw0,
else{ _} X`t8L h
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); vHI"C %
} YA;8uMqh;
} XD+cs.{5
} *0&i'0>
//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 #>=/15:
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