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: 5p:2gsk
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CountBean.java G&MO(r}B
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/* UfV {m
* CountData.java ";jAH GbO
* 1rU\ !GfR
* Created on 2007年1月1日, 下午4:44 7~ZG"^k
* 0"+QWh
* To change this template, choose Tools | Options and locate the template under R$MR|
* the Source Creation and Management node. Right-click the template and choose (Ia:>ocE0
* Open. You can then make changes to the template in the Source Editor. D62'bFB^
*/ jv1p'qs4
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package com.tot.count; k<f0moxs'
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/** gu'+kw
* '-G,7!.,r%
* @author IF//bgk-
*/ %$Q!'+YW
public class CountBean { Pl#u,Y
private String countType; 20` XklV
int countId; d)XT> &
/** Creates a new instance of CountData */ /jq"r-S"
public CountBean() {} ~EYdE qS)
public void setCountType(String countTypes){ /8hjs{(;
this.countType=countTypes; CPP9=CoR37
} a"1LF`
public void setCountId(int countIds){ wJvk
this.countId=countIds; HBk5p>&
} xcJvXp
public String getCountType(){ Esg:
return countType; +l7Bu} _?
} +s [_
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public int getCountId(){ MzlE
return countId; Th~pju
} v yP_qG
} *t={9h
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CountCache.java O&">%aU1I
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/* y92<(ziaX)
* CountCache.java *S Z]xrs
* {>brue*)
* Created on 2007年1月1日, 下午5:01 5=4-IO6W[]
* Vr&v:8:wb
* To change this template, choose Tools | Options and locate the template under H@k$sZ.
* the Source Creation and Management node. Right-click the template and choose %]O#t<D
* Open. You can then make changes to the template in the Source Editor. 8R;E+B{
*/ Me;Nn$'%
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package com.tot.count; ];0:aSi#
import java.util.*; o%Qn%gaX
/** 0E&XD&D
* qEjsAL
* @author OQT i$2
*/ .+^o {b
public class CountCache { hDEZq>&
public static LinkedList list=new LinkedList(); H{Na'_sL
/** Creates a new instance of CountCache */ :!,.c$M
public CountCache() {} bHHR^*B
public static void add(CountBean cb){ |'#uV)b0@
if(cb!=null){ B#4 J![BX
list.add(cb); [{_K[5i
}
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} j7HOh|q
} lt}U,p,S
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CountControl.java )v.\4Q4
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/* h^b=
* CountThread.java KhbbGdmfS$
* VU|Cct&)
* Created on 2007年1月1日, 下午4:57 5d82M s
* E__A1j*gd
* To change this template, choose Tools | Options and locate the template under Wy$Q!R=i
* the Source Creation and Management node. Right-click the template and choose Cd7d-'EQn
* Open. You can then make changes to the template in the Source Editor. 5wMEp" YHE
*/ HM\gOz
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package com.tot.count; T}A{Xu*:+H
import tot.db.DBUtils; k+cHx799
import java.sql.*; !^A t{[U
/** pJwy~ L
* 22m'+3I~Y
* @author = G3A}
*/ 4:v{\R
public class CountControl{ w9a6F
private static long lastExecuteTime=0;//上次更新时间 [x|{VJ(h
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 rx;zd ?
/** Creates a new instance of CountThread */ MMUw+jM4
public CountControl() {} zX/9^+p:
public synchronized void executeUpdate(){ rhvsd2zi
Connection conn=null; o>Z+=&BZ@a
PreparedStatement ps=null; ]qc2jut"
try{ tt>=Vt'
conn = DBUtils.getConnection(); _Msaub!N
conn.setAutoCommit(false); jDc5p3D&[]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); <$
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for(int i=0;i<CountCache.list.size();i++){ K&noA
CountBean cb=(CountBean)CountCache.list.getFirst(); ?2b9N ~
CountCache.list.removeFirst(); nS1D&;#Y
ps.setInt(1, cb.getCountId()); ) 4'@=q
ps.executeUpdate();⑴ BK]q^.7+:
//ps.addBatch();⑵ ];go?.*C
} #VEHyz 6P
//int [] counts = ps.executeBatch();⑶ 07+Qai-]
conn.commit(); etH%E aF[
}catch(Exception e){
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e.printStackTrace(); ToVm]zPOUt
} finally{ _#+~#U%5n
try{ r 6STc,%5
if(ps!=null) { NUH#
ps.clearParameters(); ?79ABm
a
ps.close(); FiqcM-Af4
ps=null; U{o0Posg
} I.\fhNxHY
}catch(SQLException e){} 3say&|kJ
DBUtils.closeConnection(conn); Vj"B#
} 9_F2nmEv
} Zi@+T
public long getLast(){ L{%a4Ip
return lastExecuteTime; [pFu
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} @mRrA#E#{
public void run(){ ^*ezj1
long now = System.currentTimeMillis(); KM(9&1/
if ((now - lastExecuteTime) > executeSep) { yP9wYF^A\
//System.out.print("lastExecuteTime:"+lastExecuteTime); G$|;~'E
//System.out.print(" now:"+now+"\n"); z<vO#
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); pW--^aHu
lastExecuteTime=now; bKJ7vXC05
executeUpdate(); RHl=$Hm.%
} JrWBcp:Y
else{ n.XhK_6n]M
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); agU!D[M_G
} akCo+ @
} =<zSF\Zr_
} OC>_=i$'
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 fQy
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类写好了,下面是在JSP中如下调用。 eQaxZMU
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<% ]baaOD$Z
CountBean cb=new CountBean(); M$4=q((0
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 5-WRv;
CountCache.add(cb); ?7nr\g"g(
out.print(CountCache.list.size()+"<br>"); =_m9so
CountControl c=new CountControl(); 8u'O`j
c.run(); LQ(5D_yG.
out.print(CountCache.list.size()+"<br>"); 6+B{4OY
%>