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: 4'=Q:o*w`
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CountBean.java Kc95yt
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/* nu7 R
* CountData.java NJ+$3n om
* vy}_aD{B
* Created on 2007年1月1日, 下午4:44 4I$Y"|_e
* ;[UI]?A%
* To change this template, choose Tools | Options and locate the template under KS<@;Tt
* the Source Creation and Management node. Right-click the template and choose :V5 Co!/+
* Open. You can then make changes to the template in the Source Editor. BWQ`8
*/ SMIDW}U2S
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package com.tot.count; .d}yQ#5z
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/** 7Mq{Py1
* Il9xNVos#
* @author +uSp3gE"
*/ CQNMCYjg(R
public class CountBean { <tBT?#C9+
private String countType; vPGUE`!D+
int countId; _@y uaMoW=
/** Creates a new instance of CountData */ j~1K(=Ng
public CountBean() {} !yPy@eP~
public void setCountType(String countTypes){ 1U#W=Fg'
this.countType=countTypes; $ZGup"z)
} `kxC#
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public void setCountId(int countIds){ /FE+WA}r
this.countId=countIds; #*/nUbsg
} =1dczJHV
public String getCountType(){ l"A/6r!Dp
return countType; >\^oCbqF}~
} Pj]^p{>
public int getCountId(){ ZzNHEV
return countId; M9A1
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}
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}
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CountCache.java N2U&TCc
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/* _hyqHvP
* CountCache.java 9#9bm
* v0dzM/?*
* Created on 2007年1月1日, 下午5:01 )I3E
* >;1w-n
* To change this template, choose Tools | Options and locate the template under pP1DR'
* the Source Creation and Management node. Right-click the template and choose o-Dfud@
* Open. You can then make changes to the template in the Source Editor. <uv`)Q 9
*/ XVt;hO
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package com.tot.count; ]T'8O`
import java.util.*; "i(f+N,)
/** c:Cw#
* 'DVn /3?X
* @author K=o {
*/ XJPIAN~l
public class CountCache { & ;.rPU
public static LinkedList list=new LinkedList(); &_-=(rK
/** Creates a new instance of CountCache */ 5I2 h(Td
public CountCache() {} uP%VL}%0
public static void add(CountBean cb){ ed/B.SY
if(cb!=null){ v~Dobk/n
list.add(cb); F?R6zvive
} ?_d>-NC
}
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} fsPNxy"_
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CountControl.java 8 <;.[l
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/* DJgM>&Y6,
* CountThread.java `Wjq$*
* rgCC3TX
* Created on 2007年1月1日, 下午4:57 /klo),|&
* zO\_^A|8H
* To change this template, choose Tools | Options and locate the template under Bj2iYk_cLa
* the Source Creation and Management node. Right-click the template and choose eA2*}"W
* Open. You can then make changes to the template in the Source Editor. 0J'Cx&Rg
*/ Zf}2c8Vc4
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package com.tot.count; l![79eFp
import tot.db.DBUtils; 5I6?gv/
import java.sql.*; CHv
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/** FT~c|ep.
* M !"Q7>d
* @author mfI[9G
*/ ]Xnar:5
public class CountControl{ ,&4
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private static long lastExecuteTime=0;//上次更新时间 8A]8yX =
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 0'r}]Mws
/** Creates a new instance of CountThread */ Od;k}u6;<
public CountControl() {} @w= =*.x
public synchronized void executeUpdate(){ #e-7LmO~
Connection conn=null; paD[4L?4Hk
PreparedStatement ps=null; OfBWf6b
try{ aC1 xt(
conn = DBUtils.getConnection(); .Qn#wub
conn.setAutoCommit(false); M5+R8ttc
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); =/|GWQj
for(int i=0;i<CountCache.list.size();i++){ #S/~1{
CountBean cb=(CountBean)CountCache.list.getFirst(); hlV(jz
CountCache.list.removeFirst(); *8a[M{-X
ps.setInt(1, cb.getCountId()); =v\}y+
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ps.executeUpdate();⑴
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//ps.addBatch();⑵ i: UN
} C $])q`9
//int [] counts = ps.executeBatch();⑶ (AZneK
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conn.commit(); [= E=H*j
}catch(Exception e){ vFJ4`Gjw(
e.printStackTrace(); HI D6h!
} finally{ UV;I6]$}A7
try{ l2Py2ZI-b
if(ps!=null) { $aTo9{M ^
ps.clearParameters(); {)r[?%FMgV
ps.close(); i=b'_SZ'
ps=null; @]X!#&2>
} wjX0r7^@
}catch(SQLException e){} h6LjReNo
DBUtils.closeConnection(conn); `{"V(YMEV
} !K*3bY`#
} :jTbzDqQ
public long getLast(){ #oEtLb@O
return lastExecuteTime; b4$.uLY
} !?i9fYu
public void run(){ 502(CO>
long now = System.currentTimeMillis(); mXJG &EA
if ((now - lastExecuteTime) > executeSep) { md{1Jn"
//System.out.print("lastExecuteTime:"+lastExecuteTime); 78xiT
//System.out.print(" now:"+now+"\n"); 8sDw:wTC
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); X%*BiI
lastExecuteTime=now; ]OKKR/:
executeUpdate(); epk
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} 8[^b8^
else{ o%]b\Vl6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); j
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} DP*V|)
} r
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} T^|6{ S\
//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 iuEe#B;!
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类写好了,下面是在JSP中如下调用。 k~<ORnda
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<% ;2BPEo>z9
CountBean cb=new CountBean(); /*S6 /#
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); }F V_jJ
CountCache.add(cb); '#lEUlB
out.print(CountCache.list.size()+"<br>"); 3WkrG.$[b
CountControl c=new CountControl(); {|zQ
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c.run(); q}JP;p(#
out.print(CountCache.list.size()+"<br>"); 9~f
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