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: ;km`P|<U
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CountBean.java 9P1OP Xv*p
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/* )tC5Hijq,
* CountData.java 8}I$'x
* ~Otq %MQ
* Created on 2007年1月1日, 下午4:44 #{\J
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* FvaUsOy"
* To change this template, choose Tools | Options and locate the template under [>jbhV'
* the Source Creation and Management node. Right-click the template and choose pR*VdC _mY
* Open. You can then make changes to the template in the Source Editor. K^
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*/ Kf bb)?
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package com.tot.count; qk%;on&`
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/** 66g9l9wm(
* S5gyr&dm
* @author Yz<3JRw
*/ zIqU,n|]s
public class CountBean { }z eO]"`
private String countType; QmQ=q7
int countId; %6|nb:Oa
/** Creates a new instance of CountData */ 5MroNr
public CountBean() {} H`*LBqDk
public void setCountType(String countTypes){ EEEh~6?-e
this.countType=countTypes; =2`[&
} Kr?TxhUHd
public void setCountId(int countIds){ 5#HW2"7
this.countId=countIds; F6|TP.VY_.
} 4GkWRu1
public String getCountType(){ C'>|J9~Gz
return countType; ()Y~Q(5ji
} z 9vInf@M
public int getCountId(){ vk}n,ecl
return countId; OSRp0G20k\
} _~'=C#XI)
} hCi 60%g/n
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CountCache.java h1j!IG
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/* tZ]?^_Y1
* CountCache.java f/ U`
* rlML W
* Created on 2007年1月1日, 下午5:01 j
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* >BV^H.SO|1
* To change this template, choose Tools | Options and locate the template under x)
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* the Source Creation and Management node. Right-click the template and choose bHY=x}Hv
* Open. You can then make changes to the template in the Source Editor. }fp-pe69z
*/ (o 5s"b
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package com.tot.count; Sgeh %f
import java.util.*; 6Pz4\uE=
/** 'K$[^V
* R"-mKT}
* @author ^PDJ0k/u1
*/ @D]5c ivm_
public class CountCache { >Rl"
public static LinkedList list=new LinkedList(); DHyq^pJ
/** Creates a new instance of CountCache */ `"Jj1O@
public CountCache() {} S-a]j;U
public static void add(CountBean cb){ `68@+|#
if(cb!=null){ DEBB()6,
list.add(cb); 2bv=N4ly
} evya7^,F
} (9tX5$e6N
} oTEL?hw5
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CountControl.java ]tim,7s
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/* ^-TE([ bW
* CountThread.java 7LfAaj
* rF3wx.
* Created on 2007年1月1日, 下午4:57 IY_iB*T3jt
* EB0TTJR?#
* To change this template, choose Tools | Options and locate the template under IDad9 Bx
* the Source Creation and Management node. Right-click the template and choose /Y/UM3/
* Open. You can then make changes to the template in the Source Editor. =%BSKSG.
*/ d8DV[{^
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package com.tot.count; \Q {m9fE
import tot.db.DBUtils; DRSr%d
import java.sql.*; tl[Uw[
/** >Ifr [
* [xbSYu,&
* @author 1Rt33\1J0
*/ GiJ *Wp
public class CountControl{ 1;JEc9#h
private static long lastExecuteTime=0;//上次更新时间 @T@<_ ?)
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 S%$ }(
/** Creates a new instance of CountThread */ nxO"ua
public CountControl() {} ^NLmgwQ
public synchronized void executeUpdate(){ 9d>-MX'
Connection conn=null; n|6Ic,:[
PreparedStatement ps=null; aR[JD2G
try{ uY{|szC^2
conn = DBUtils.getConnection(); 2\)xpOj
conn.setAutoCommit(false); mWv3!i;G<s
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); hM_lsc
for(int i=0;i<CountCache.list.size();i++){ 99]R$eT8
CountBean cb=(CountBean)CountCache.list.getFirst(); 'HO$C,1]
CountCache.list.removeFirst(); kAKK bmE
ps.setInt(1, cb.getCountId()); d.[8c=$
ps.executeUpdate();⑴ #?RU;1)Cw
//ps.addBatch();⑵ b\ X@gq
} ~]nRV *^
//int [] counts = ps.executeBatch();⑶ @tF\p
conn.commit(); \|n-
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}catch(Exception e){ 8mCxn@yV
e.printStackTrace(); EHSlK5bD,
} finally{ .14~J6
try{ #F:p-nOq
if(ps!=null) { zp6C3RG(
ps.clearParameters(); a f6M,{F
ps.close(); 32(^Te]:
ps=null; oF vfCrd
} ]v?@g:iE
}catch(SQLException e){} #./fY;:cj
DBUtils.closeConnection(conn); Juo^ ,
} $&Gu)4'+
} l\f*d6o
public long getLast(){ J;S
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return lastExecuteTime; &PL8