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: Ax;[ Em?I
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CountBean.java BzzC|
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/* 4Z"}W!A
* CountData.java m@td[^O-
* EhcJE;S)
* Created on 2007年1月1日, 下午4:44 `\kihNkJn3
* |kYlh5/c d
* To change this template, choose Tools | Options and locate the template under ] G&*HMtp
* the Source Creation and Management node. Right-click the template and choose [n2B6Px
* Open. You can then make changes to the template in the Source Editor. 'NEl`v*<P
*/ uE-(^u
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package com.tot.count; 6hxZ5&;(*
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/** v/+ <YU
* Re$h6sh
* @author G;Li!H
*/ (Rw<1q`,
public class CountBean { KGz Nj%
private String countType;
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int countId; *]$B 9zVs!
/** Creates a new instance of CountData */ v"USD<
public CountBean() {} )9]a
public void setCountType(String countTypes){ ".?4`@7F\
this.countType=countTypes; XUqorE
} Eb8pM>'qM
public void setCountId(int countIds){ //R"ZE@d\
this.countId=countIds; b6D;98p
} |R`"Zu`
public String getCountType(){ M3(N!xT
return countType; fF@w:;u
} ;qshd'?*
public int getCountId(){ Bn}woyJdx
return countId; \T7Mt|f:5
} (jT)o,IW&
} Y6` xb`
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CountCache.java 4&iQo'
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/* 4Yj1Etq.E
* CountCache.java .ZTvOm'mB^
* Ez3fL&*
* Created on 2007年1月1日, 下午5:01 ]I?.1X5d0
*
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* To change this template, choose Tools | Options and locate the template under @N=vmtLP
* the Source Creation and Management node. Right-click the template and choose K@JZ$
* Open. You can then make changes to the template in the Source Editor. DB'v7
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*/ 0dchOUj
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package com.tot.count; M5dYcCDE
import java.util.*; pSs*Z6c)@
/** J=g)rd[`
* acd[rjeT
* @author Pvxb6\G&d
*/ Q]ersA8 V>
public class CountCache { VD;*UkapZx
public static LinkedList list=new LinkedList(); slQn
/** Creates a new instance of CountCache */ SE'Im
public CountCache() {} broLC5hbQU
public static void add(CountBean cb){ "Xq_N4
if(cb!=null){ &> sbsx\y
list.add(cb); c;l!i-
} q+ax]=w
} :U6`n
} e4z`:%vy
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CountControl.java PL/g| ;
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/* honh'j
* CountThread.java $0])%
* 6u[fCGi%
* Created on 2007年1月1日, 下午4:57 3I6ocj[,
* }vndt*F
* To change this template, choose Tools | Options and locate the template under (b&g4$!x&5
* the Source Creation and Management node. Right-click the template and choose =sJ?]U
* Open. You can then make changes to the template in the Source Editor. Aoe\\'O|V
*/ 8Fn\ycX#"l
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package com.tot.count; Y|Iq~Qy~
import tot.db.DBUtils; ]aX@(3G1s
import java.sql.*; $:9t(X)H
/** c*bvZC^6
* _imuyt".+
* @author {bj!]j
*/ #<{v~sVp&
public class CountControl{ MIMC(<
private static long lastExecuteTime=0;//上次更新时间 X/5m}-6d]
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `#""JTA"
/** Creates a new instance of CountThread */ i]8O?Ab>?
public CountControl() {} s68(jYC7[
public synchronized void executeUpdate(){ dlu*s(O"
Connection conn=null; ?qh-#,O9B
PreparedStatement ps=null; "{q#)N
try{ ,9&cIUH
conn = DBUtils.getConnection(); !_fDL6a-
conn.setAutoCommit(false); WAu>p3
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); NxP(&M(
for(int i=0;i<CountCache.list.size();i++){ Kz HYh
CountBean cb=(CountBean)CountCache.list.getFirst(); lC<;Q*Y
CountCache.list.removeFirst(); 'zyw-1
ps.setInt(1, cb.getCountId()); i|:!I)(lh
ps.executeUpdate();⑴ -|>~I#vY
//ps.addBatch();⑵ /jv/qk3i
} 5.rAxdP
//int [] counts = ps.executeBatch();⑶ $dC`keQM>9
conn.commit(); Sd7jd ?#9'
}catch(Exception e){ =LW!$p
e.printStackTrace(); N'
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} finally{ lY%I("2=
try{ x,B] J4
if(ps!=null) { 'uL4ezTtA
ps.clearParameters(); (x=$b(I
ps.close(); 7KC>?F
ps=null; RQVu~7d[
} \YP,}_~
}catch(SQLException e){} E7Lqa
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DBUtils.closeConnection(conn); cu!%aM,/<-
} jn(x-fj6R
} c1YDln
public long getLast(){ "@V yc6L
return lastExecuteTime; [F-R*}&x
} xyL"U*
public void run(){ Z.VKG1e}
long now = System.currentTimeMillis(); 8>KUx]AN
if ((now - lastExecuteTime) > executeSep) { 1lw%RM
//System.out.print("lastExecuteTime:"+lastExecuteTime); DDE-$)lf>
//System.out.print(" now:"+now+"\n"); %>+uEjbT
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); zPt<b!q
lastExecuteTime=now; `Ba]i) !
executeUpdate(); :So<N}&
} -FZC|[is
else{ fi?4!h
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); FnvpnU",
} GJ9>i)+h;
} yD+4YD
} 0Lo8pe`DH
//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 .NOAp
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类写好了,下面是在JSP中如下调用。 L(y70T
\|=6<ZY:
<% oe<i\uX8z
CountBean cb=new CountBean(); [LoQYDku
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); HP# SR';E
CountCache.add(cb); (W}F\P
out.print(CountCache.list.size()+"<br>"); l=DF)#>w
CountControl c=new CountControl(); AtQ.H-8r
c.run(); IO)B3,g
out.print(CountCache.list.size()+"<br>"); 9q'9i9/3d
%>