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: )j](_kvK
pxgv(:Tw
CountBean.java ;k>{I8L~
FXbNmBXF
/* D3eK!'qS
* CountData.java Js'|N%pi
* >QYxX<W
* Created on 2007年1月1日, 下午4:44 @I%m}>4Jm
* b+kb7
* To change this template, choose Tools | Options and locate the template under =Oy,SX
* the Source Creation and Management node. Right-click the template and choose .*ZNZ|g_
* Open. You can then make changes to the template in the Source Editor. B$)KZR(u
*/ `+U-oqs
Ab2VF;z :
package com.tot.count; 1!~9%=%
jsuQR
/** r_)*/
* aD.A +e s
* @author jk~<si
*/ >6Q-e$GS@
public class CountBean { m#uutomi0
private String countType; BJqM=<nQ
int countId; hSxf;>(d
/** Creates a new instance of CountData */ p0Vw@R=
public CountBean() {} o;t{YfK
public void setCountType(String countTypes){ Ba"Z^(:
this.countType=countTypes; t ,0~5>5
} g%K3ah
v
public void setCountId(int countIds){ 1_A< nt?'R
this.countId=countIds; ;lGjj9we>
} c Mq|`CM
public String getCountType(){ wEdXaOEB5
return countType; |KuH2,n0
} Zvc{o8^z
public int getCountId(){ \hg12],#:@
return countId; xk#/J]j
} !aLL|}S
} T7[ItLZ
4]Krx
m`8
CountCache.java $N~8^6
)F:hv[iv
/* TtHqdKL
* CountCache.java K1Uur>Pk%
* 1g
*4e
* Created on 2007年1月1日, 下午5:01 J
9z\ qTI
* 0 ~VniF^
* To change this template, choose Tools | Options and locate the template under ^*Sb)tu\ W
* the Source Creation and Management node. Right-click the template and choose j#29L"
* Open. You can then make changes to the template in the Source Editor. gP`8hNwR
*/ X[R/j*K
DEs/?JZG
package com.tot.count; ,2"-G";!f\
import java.util.*; $cjidBi`):
/** zI&oZH^vn
* U\+o$mU^
* @author 9mr99tA
*/ Iu=iC.50}
public class CountCache { <J\z6+,4E
public static LinkedList list=new LinkedList(); pbJs3uIR
/** Creates a new instance of CountCache */ n<?:!f`
public CountCache() {} <~'\~Z d+
public static void add(CountBean cb){ [8<)^k
if(cb!=null){ iJU]|t
list.add(cb); %;GDg3L[p
} _Y=>^K]9K
} ?,]25q
} oTZNW
EiSS_Lc
CountControl.java G> "w$Us
rlgp1>89
/* Mc9% s$MT
* CountThread.java c{zQX0
* >a[)F
* Created on 2007年1月1日, 下午4:57 +Ibcc8Qud
* L9"V$MO
* To change this template, choose Tools | Options and locate the template under 5Osx__6 $t
* the Source Creation and Management node. Right-click the template and choose H{yeN 5
* Open. You can then make changes to the template in the Source Editor. u[})|x*N
*/ FgLV>#)-
|.X?IJ`
package com.tot.count; 1Jt5|'tl
import tot.db.DBUtils; _dj_+<Y?
import java.sql.*; }! x\qpA
/** `|[Q]+Mx
* u`3J2,.
* @author 4Z,MqG>
*/ 3 cu`U`
public class CountControl{ >k5nU^|B1
private static long lastExecuteTime=0;//上次更新时间 Ab/gY$l
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 J;HkR9<C
/** Creates a new instance of CountThread */ eVS6#R]'m
public CountControl() {} [?^,,.Dd
public synchronized void executeUpdate(){ V0XQG}
Connection conn=null; uL`;KD
PreparedStatement ps=null; b|P[\9
try{ hvkLcpE
conn = DBUtils.getConnection(); @h$cHZ
conn.setAutoCommit(false); [td)v,
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); -)PQ&[
for(int i=0;i<CountCache.list.size();i++){ Hz `aj
CountBean cb=(CountBean)CountCache.list.getFirst(); ^fa+3`>
CountCache.list.removeFirst(); E)7vuWOO
ps.setInt(1, cb.getCountId()); 9t9x&.A
ps.executeUpdate();⑴ /^SIJS@^`>
//ps.addBatch();⑵ (]>=y
} CNwIM6t
//int [] counts = ps.executeBatch();⑶ 4cDjf~n
conn.commit(); qS:hv&~
}catch(Exception e){ -W<x|ph
U
e.printStackTrace(); Y xp.`
} finally{ =Q>'?w>
try{ x4Q*~,n
if(ps!=null) { 9KkxUEkW
ps.clearParameters(); cia'h_w
ps.close(); 9Ra*bP ]1
ps=null; nep0<&