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: VE&
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CountBean.java PYkcGtVa_
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/* =8X`QUmT
* CountData.java e7t).s)b{
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* Created on 2007年1月1日, 下午4:44 P1vr}J
* @4B+<,i
* To change this template, choose Tools | Options and locate the template under VW<s_
* the Source Creation and Management node. Right-click the template and choose !X(Lvt/
* Open. You can then make changes to the template in the Source Editor. ;/N[tO?Q
*/ >>rW-&
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package com.tot.count; 3q R@$pm
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/** XASoS5
* lJi'%bOi
* @author ME[Wg\
*/ -9~kp'_a
public class CountBean { @X>k@M
private String countType; ^b~&}uU
int countId; Kf76./
/** Creates a new instance of CountData */ LZMdW
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public CountBean() {} $)mq
public void setCountType(String countTypes){ %.r{+m
this.countType=countTypes; r) T^ Td1
} S6B(g_D|
public void setCountId(int countIds){ k;3Bv 6
this.countId=countIds; hqnJ@N$yY
} &32qv`
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public String getCountType(){ b=9(gZ 9
return countType; |VB}Kv
} `)`_G!a
public int getCountId(){ D%LqLLD
return countId; o$'Fz[U
} >-r\]/^
}
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CountCache.java (ivV [
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/* 4))u*c/,
* CountCache.java QUaz;kNC7
* *#+d j"
* Created on 2007年1月1日, 下午5:01 AU}lKq7%
* 9xB^dKM3
* To change this template, choose Tools | Options and locate the template under vz)A~"E
* the Source Creation and Management node. Right-click the template and choose = PqQJE}
* Open. You can then make changes to the template in the Source Editor. 5{zXh
*/ q#pBlJ.LK
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package com.tot.count; UG s
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import java.util.*; :bE ^b
/** P|v ;'9
* $hPAp}
* @author qDM/
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*/ }zj w\
public class CountCache { r6Lb0PzMf
public static LinkedList list=new LinkedList(); Ig'Y]%Z0
/** Creates a new instance of CountCache */ '/\@Mc4T
public CountCache() {} FZ #ngrT
public static void add(CountBean cb){ A]Zp1XEG
if(cb!=null){ ndOPD]A'
list.add(cb); U_ V0
} 7ZET@
} "monuErg&
} <.HHV91
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CountControl.java ^v}Z5,aN
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/* C0jmjZ%w@
* CountThread.java uwj/]#`
* CJJ 1aM
* Created on 2007年1月1日, 下午4:57 =9\=5_V
* 4(R O1VWsb
* To change this template, choose Tools | Options and locate the template under a)(j68c
* the Source Creation and Management node. Right-click the template and choose +N5G4t#.
* Open. You can then make changes to the template in the Source Editor. %aaOws
*/ @I]uK[qd
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package com.tot.count; Vvm6T@b M8
import tot.db.DBUtils; Q0gO1T
import java.sql.*; _R1UEE3M
/** ,vrdtL
* Qf414 oW
* @author Nn
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*/ q5BJsw
public class CountControl{ TIW6v4
private static long lastExecuteTime=0;//上次更新时间 !Wvzum@5D
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 BgA\l+
/** Creates a new instance of CountThread */ }[!;c+ke
public CountControl() {} HoT5 5v!o
public synchronized void executeUpdate(){ }1`Rq?@J
Connection conn=null; l'&l!D&
PreparedStatement ps=null; )"&-vg<
try{ ?p. dc~tZ
conn = DBUtils.getConnection(); Q[i;IbY
conn.setAutoCommit(false); x&l?Cfvv=
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); GLwL'C'591
for(int i=0;i<CountCache.list.size();i++){ BXa1[7Z
CountBean cb=(CountBean)CountCache.list.getFirst(); NRcg~Nu
CountCache.list.removeFirst(); 6vX+-f
ps.setInt(1, cb.getCountId()); 6O"Vy
ps.executeUpdate();⑴ 'M_8U0k
//ps.addBatch();⑵ `tVBV:4\
} 7V 4iPx
//int [] counts = ps.executeBatch();⑶ a,d\<mx
conn.commit(); Ki^m&P
}catch(Exception e){ BNyDEFd
e.printStackTrace(); nv{ou[vQ
} finally{ MQQiQ 2
try{ K>RL
if(ps!=null) { S"|D!}@-
ps.clearParameters(); 'h O+ b
ps.close(); <z#r3J
ps=null; C0 .Xp
} c500:OSB
}catch(SQLException e){} To]WCFp6@
DBUtils.closeConnection(conn); B6 x5E
} {AO3o<-h
} izY,t!
public long getLast(){ f4/!iiS}r
return lastExecuteTime; >%qGK-_
} ZA2y
public void run(){ kC01s
long now = System.currentTimeMillis(); cOOPNa>5_
if ((now - lastExecuteTime) > executeSep) { ?b#/*T}ac
//System.out.print("lastExecuteTime:"+lastExecuteTime); _L_SNjA_
//System.out.print(" now:"+now+"\n"); oMLpl3pl
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 01H3@0Q6
lastExecuteTime=now; >/6v`
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executeUpdate(); /{>ds-;-
} ,PJl32
else{ 5irewh'R
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); >Eik>dQ a
} HjGT{o
} /p<mD-:.M
} ^P"t
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//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 a+A/l
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类写好了,下面是在JSP中如下调用。 _]j=[|q 9
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<% Vn];vN
CountBean cb=new CountBean(); VY=~cVkzS
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); GY@Np^>[a
CountCache.add(cb); K._1sOw'"Y
out.print(CountCache.list.size()+"<br>"); ,{J2i#g<
CountControl c=new CountControl(); _=UXNr8S
c.run(); SK;f#quUQ
out.print(CountCache.list.size()+"<br>"); @faf
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