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: \NPmym_6J
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CountBean.java +S o4rA*9
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/* !|^|,"A)
* CountData.java ,o86}6Ag
* |-:()yxs
* Created on 2007年1月1日, 下午4:44 GeH#I5y
* v[1aWv:
* To change this template, choose Tools | Options and locate the template under ssfr}fzH
* the Source Creation and Management node. Right-click the template and choose 'jWr<]3
* Open. You can then make changes to the template in the Source Editor. *4\:8
*/ geru=7
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package com.tot.count; D4eDHq
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/** _kef0K6
* y%"{I7!A
* @author %O|iE M
*/ dqU~`b9
public class CountBean { fK>L!=Q
private String countType; ?WGA?J %2
int countId; R@1 xt@?
/** Creates a new instance of CountData */ ,LHn90S
public CountBean() {} !|S(Ms
public void setCountType(String countTypes){ L>jY.d2w=K
this.countType=countTypes; n\mO6aJ
} ha]VWt%}
public void setCountId(int countIds){ 8'HEms
this.countId=countIds; |3('
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} 9}rS(/@
}
public String getCountType(){ f z'@_4hg
return countType; ZF!h<h&,
} h0g8*HY+}
public int getCountId(){ NVkV7y X]
return countId; ~[t[y~Hup
} 3#LlDC_WC
} Z@4Arfl
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CountCache.java k
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/* R$R *'l
* CountCache.java Xr,1&"B&t
* Hus)c3Ty7
* Created on 2007年1月1日, 下午5:01 ik)|{%!K]H
* /:cd\A}
* To change this template, choose Tools | Options and locate the template under /2&c$9=1
* the Source Creation and Management node. Right-click the template and choose 9)l$ aBa
* Open. You can then make changes to the template in the Source Editor. 'p^t^=dQ
*/ U7?;UCmX
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package com.tot.count; ) ;EBz
import java.util.*; d-oMQGOklb
/** iDpSj!x/_
* z<MsKD0Q
* @author xVw9v6@`h
*/ = }~hWL
public class CountCache { eb?x9h
public static LinkedList list=new LinkedList(); xB@ T|EP
/** Creates a new instance of CountCache */ >R'F,
public CountCache() {} dn&s*
public static void add(CountBean cb){ !Lu2
if(cb!=null){ !Z1@}`V&;
list.add(cb); 8=!D$t\3
} l5~os>
} 4j*
} AzPu)
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CountControl.java hqD*z6aH
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/* |44Ploz2b
* CountThread.java aEB_#1
* [|v][Hwv
* Created on 2007年1月1日, 下午4:57 C2!|OQ9A2
* }H53~@WP>
* To change this template, choose Tools | Options and locate the template under pd?Mf=>#
* the Source Creation and Management node. Right-click the template and choose HVRZ[Y<^
* Open. You can then make changes to the template in the Source Editor. [DuttFX^x
*/ rm7ANMB:
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package com.tot.count; x5pdS:
import tot.db.DBUtils; Zpt\p7WQ
import java.sql.*; !t"4!3
/** @FAA2d
* n9\TO9N
* @author /|}EL%a
*/ +|3@=.V
public class CountControl{ `bq<$e
private static long lastExecuteTime=0;//上次更新时间 <sbu;dQ`
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 rI{; I DV
/** Creates a new instance of CountThread */ hPkp;a #
public CountControl() {} b`Zx!^
public synchronized void executeUpdate(){ @?sRj&w
Connection conn=null; 'ms-*c&
PreparedStatement ps=null; !)f\%lb
try{ "S[450%
conn = DBUtils.getConnection(); u,ho7ht3(
conn.setAutoCommit(false); jVe1b1rt~3
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); )rU
for(int i=0;i<CountCache.list.size();i++){ bIDj[-CDG
CountBean cb=(CountBean)CountCache.list.getFirst(); NWESP U):w
CountCache.list.removeFirst(); J3V=
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ps.setInt(1, cb.getCountId()); tAd%#:K
ps.executeUpdate();⑴ h8q[1"a:
//ps.addBatch();⑵ $S6`}3
} RMV/&85?y
//int [] counts = ps.executeBatch();⑶ v4TQX<0s
conn.commit(); C}j"Qi`
}catch(Exception e){ l'rja.\
e.printStackTrace(); UW={[h{.|@
} finally{ U+jOTq8 M
try{ `,(4]tlL
if(ps!=null) { bSlF=jT[S
ps.clearParameters(); /{J4:N'B>
ps.close(); z|J_b"u4
ps=null; *8 A
} tKuwpT1Qc
}catch(SQLException e){} )AtD}HEv
DBUtils.closeConnection(conn); 4"(Bu/24
} KK4`l}Fk:n
} $99n&t$Y
public long getLast(){ }"H,h)T
return lastExecuteTime; m])y.T
} cl3K<'D
public void run(){ 3ZPWze6
long now = System.currentTimeMillis(); <$$yw=ef
if ((now - lastExecuteTime) > executeSep) { !*&V-4
//System.out.print("lastExecuteTime:"+lastExecuteTime); s\(k<Ks
//System.out.print(" now:"+now+"\n"); +) om^e@.
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 76Cl\rV
lastExecuteTime=now; NiEUW.0
executeUpdate(); p4rL}Jm&
} NA`SyKtg_
else{
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); O63<AY@
} jOunWv|
} I_#kgp
} -0 a/$h
//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 8 >EWKI9
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类写好了,下面是在JSP中如下调用。 9&2O9Nz6
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<% 0S_~ \t
CountBean cb=new CountBean(); gCS<iBT(7
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); y2dCEmhY
CountCache.add(cb); 2;`1h[,-^
out.print(CountCache.list.size()+"<br>"); dq6m>;`
CountControl c=new CountControl(); $9#H04.x
c.run(); ~
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out.print(CountCache.list.size()+"<br>"); c|y(2K)o[=
%>