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: }/#*opcv
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CountBean.java &,3s2,1U(
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/* u+
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* CountData.java .C&kWM&j
* <lNNT6[/r
* Created on 2007年1月1日, 下午4:44 s5 {B1e
* 8B]\;m
* To change this template, choose Tools | Options and locate the template under Ptcq/f
* the Source Creation and Management node. Right-click the template and choose f mJK+
* Open. You can then make changes to the template in the Source Editor. w^=(:`
*/ 54B`T/>R:E
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package com.tot.count; .z=%3p8+
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/** ~H:=p
* h_\(
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* @author _n!>*A!
*/ mIp> ~
public class CountBean { ~:PM_o*6
private String countType; oO`a {n-
int countId; 4)>UTMF
/** Creates a new instance of CountData */ %Ofw"W
public CountBean() {} OCJt5#e~A
public void setCountType(String countTypes){ Q`NdsS2
this.countType=countTypes; :WsHP\r
} /Oi(5?Jn
public void setCountId(int countIds){ [8q`~S%-]
this.countId=countIds; RZKx!X4=q
} Z_edNf}|
public String getCountType(){ D(TG)X?
return countType; N{ $?u
} p|NY.N
public int getCountId(){ H+-x.l`
return countId; GN
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} ~7PiIky.
} }Y|M+0
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CountCache.java M X?UmQ'
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/* lrwQ
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* CountCache.java ]~VuY:abH
* -QR]BD%J*[
* Created on 2007年1月1日, 下午5:01 Qx3eEt@X5]
* !`4ie
* To change this template, choose Tools | Options and locate the template under /OB) \{-
* the Source Creation and Management node. Right-click the template and choose )db:jPkwd
* Open. You can then make changes to the template in the Source Editor. V~
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*/ -3ANNj
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package com.tot.count; 6Vncr}
import java.util.*; G<k.d"<
/** mPqKk
* :-<30LS$
* @author nqx0#_K-E
*/ 63_#*6Pv28
public class CountCache { Ayv:Pv@
public static LinkedList list=new LinkedList(); V6_5v+n
/** Creates a new instance of CountCache */ cH$(*k9%M
public CountCache() {} dtTfV.y4w
public static void add(CountBean cb){ ]Hq,Pr_+
if(cb!=null){ akPd#mf
list.add(cb); Iw`|,-|
} jcvq:i{
} l:bbc!3
} |Kjfh};-C
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CountControl.java n7Bv~?DM
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/* %Tu(>vnuj
* CountThread.java Y~Vc|zM^(
* |pbetA4&
* Created on 2007年1月1日, 下午4:57 _(~LXk^C
* Y2tBFeWY
* To change this template, choose Tools | Options and locate the template under !4gHv4v;
* the Source Creation and Management node. Right-click the template and choose n[r1h=?j3
* Open. You can then make changes to the template in the Source Editor. ujN~l_4
*/ {dP6fr1z
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package com.tot.count; MxI*ml8z?
import tot.db.DBUtils; t9*e" QH
import java.sql.*; (3Xs
/** [{R>'~
* Z]WX 7d
* @author | oM`
*/ *93=}1gN
public class CountControl{ ^'du@XCf}
private static long lastExecuteTime=0;//上次更新时间 2A =Y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 X[dH*PV
/** Creates a new instance of CountThread */ ^!i4d))
public CountControl() {} fVa z'R
public synchronized void executeUpdate(){ k h*WpX
Connection conn=null; e-UWbn'~
PreparedStatement ps=null;
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try{ 1JdMw$H
conn = DBUtils.getConnection(); ~Ym*QSD
conn.setAutoCommit(false); R.l!KIq
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 0%;| B
for(int i=0;i<CountCache.list.size();i++){ UWhHzLcXh
CountBean cb=(CountBean)CountCache.list.getFirst(); `F1Yfm
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CountCache.list.removeFirst(); yS:w>xU @<
ps.setInt(1, cb.getCountId()); :w
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ps.executeUpdate();⑴ )c1Pj#|
//ps.addBatch();⑵ py':36'
} u rQvJ
//int [] counts = ps.executeBatch();⑶ ]Ol
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conn.commit(); 6(t'B!x
}catch(Exception e){ \o3s&{+y,
e.printStackTrace(); Mae2L2vc
} finally{ iRca c[uV
try{ z.\\m;s
if(ps!=null) { $s]&92
ps.clearParameters(); '@WBq!p
ps.close(); \L$]2"/v-
ps=null; fk6=;{
} 9!_LsQ\)
}catch(SQLException e){} UY,u-E"
DBUtils.closeConnection(conn); bA$ElKT
} ;14Q@yrZ0
} fhRu-
public long getLast(){ 8'zfq
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return lastExecuteTime; "}%j'
} $sb@*K}:4
public void run(){ H8B.c%_|U
long now = System.currentTimeMillis(); p[%~d$JUq
if ((now - lastExecuteTime) > executeSep) { dD'KP4Io@
//System.out.print("lastExecuteTime:"+lastExecuteTime); zL50|U0H
//System.out.print(" now:"+now+"\n"); BILZ XMf
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Mh3L(z]/E
lastExecuteTime=now; |HJ`uGN<b
executeUpdate(); )k[XO
} `WxGU
else{ N>sT@ >
)
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); UUtSme
} .wWf#bB
} 8@rF~^-_
}
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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 /cw"
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类写好了,下面是在JSP中如下调用。 +!`$(
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<% @m:'
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CountBean cb=new CountBean(); ~R=p[h)
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Eg&Q,dH[
CountCache.add(cb); 4\ )WMP
out.print(CountCache.list.size()+"<br>"); MIZ!+[At
CountControl c=new CountControl(); [xGL0Z%)t
c.run(); ^ yF
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out.print(CountCache.list.size()+"<br>"); RLLL=?W@
%>