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: &Gy'AUz-
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CountBean.java =JySY@?9
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/* om*tdG
* CountData.java $Kw"5cm
* %DND&0`
* Created on 2007年1月1日, 下午4:44 2'O!~8U
* yaYIgG
* To change this template, choose Tools | Options and locate the template under
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* the Source Creation and Management node. Right-click the template and choose UtGd/\:
* Open. You can then make changes to the template in the Source Editor. n/-p;#R
*/ 2U+z~
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package com.tot.count; q*<J$PI
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/** eqUn8<<s
* 0-&sJ
* @author
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*/ e G*s1uQl
public class CountBean { EDa08+Y
private String countType; ]Xkc0E1
int countId; (Aov}I+
/** Creates a new instance of CountData */ ;t@ 3Go
public CountBean() {} Vp{RX8?.
public void setCountType(String countTypes){ {7M4SC@p|
this.countType=countTypes; )*$
} :;hBq4h
public void setCountId(int countIds){ 8HH.P`Vk#
this.countId=countIds; ]B[/sqf
} Q'Jpsmwu
public String getCountType(){ %f3Nml
return countType; tWX+\ |
} 2AdHj&XE
public int getCountId(){ )l!&i?h%
return countId; IpaJ<~ p
} !i"9f_
} 9OJ\n|,(
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CountCache.java s$nfY.C
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/* MS*Mem,
* CountCache.java Q&U= jX
* DRBYH(
* Created on 2007年1月1日, 下午5:01 i]^*J1a
* :R|2z`b!
* To change this template, choose Tools | Options and locate the template under r<f-v_bxF
* the Source Creation and Management node. Right-click the template and choose ~E:/oV:4 >
* Open. You can then make changes to the template in the Source Editor. i7w}`vs
*/ 3bI|X!j
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package com.tot.count; {*=5qV}
import java.util.*; "d^lS@~
/** 0?4^.N n3
* ?[>BssW
* @author :#!F 7u
*/ A&_i]o
public class CountCache { t;a}p_>
public static LinkedList list=new LinkedList(); s7)# NT2
/** Creates a new instance of CountCache */ xzf)_ <
public CountCache() {} T?}=k{C]
public static void add(CountBean cb){ =L; n8~{@y
if(cb!=null){ iNrmhiql
list.add(cb); }-]s#^'w
} TXk"[>,:H
} UNH}*]u4`
} K
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CountControl.java 8'_
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/* PQ!?gj
* CountThread.java B xN#Nk~
*
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* Created on 2007年1月1日, 下午4:57 1MzB?[gx
* eEds-&_
* To change this template, choose Tools | Options and locate the template under WE8L?55_Au
* the Source Creation and Management node. Right-click the template and choose Z(`K6`KM
* Open. You can then make changes to the template in the Source Editor. Z_ *ZUN?B
*/ w7ABnX
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package com.tot.count; =VI`CBQ/Um
import tot.db.DBUtils; h^,YYoA$
import java.sql.*; d5W[A#}
/** I:2jwAl
* Q ]koj!mMl
* @author U?m?8vhR6(
*/ sVl:EVv
public class CountControl{ Erymx$@P
private static long lastExecuteTime=0;//上次更新时间 i~PZvxt
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %RF
/** Creates a new instance of CountThread */ BOcEL%+
public CountControl() {} )UU6\2^
public synchronized void executeUpdate(){ &(U=O?r7
Connection conn=null; Ita!07
PreparedStatement ps=null; M(f*hOG{Y
try{ ha'm`LiX
conn = DBUtils.getConnection(); tp3N5I
conn.setAutoCommit(false); |`9zE]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); a{YVz\?d}
for(int i=0;i<CountCache.list.size();i++){ R$'nWzX#
CountBean cb=(CountBean)CountCache.list.getFirst(); sBG(CpQ
CountCache.list.removeFirst(); gYIYA"xN`
ps.setInt(1, cb.getCountId()); oM7-1O
ps.executeUpdate();⑴ ,T>2zSk
//ps.addBatch();⑵ (HgdmN%
} K1:)J.ca_
//int [] counts = ps.executeBatch();⑶ w9?wy#YI
conn.commit(); =|zyi|
}catch(Exception e){ us *l+Jw,m
e.printStackTrace(); K?<Odw'k
} finally{ ov.rHVeI
try{ L7'X7WYf&
if(ps!=null) { .3SjkC4I
ps.clearParameters(); )W7H{#
ps.close(); ;7{wa]
ps=null; 4>eg@s N
} VTkT4C@I;Y
}catch(SQLException e){} F>{uB!!L4
DBUtils.closeConnection(conn); BP><G^
} y,eoTmaI
} TgG)btQ
public long getLast(){ ^O9m11
return lastExecuteTime; <}>-ip?
} -PuVI5L<
public void run(){ Ho{?m^
long now = System.currentTimeMillis(); lt2&uYgp
if ((now - lastExecuteTime) > executeSep) { ^g"6p#S=n
//System.out.print("lastExecuteTime:"+lastExecuteTime); ]o[HH_`s@
//System.out.print(" now:"+now+"\n"); Wl"fh_
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ag4^y&
lastExecuteTime=now; 6m<9^NT
executeUpdate(); zT 40,rk
} \}(-9dr
else{ )u:8Pv
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 6q7Y`%j
} iFT3fP'> 5
} 4SO{cst
} : .eS|
//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 *J-jr8&
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类写好了,下面是在JSP中如下调用。 PU\q.y0R
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<% AYtcN4\/
CountBean cb=new CountBean(); U}5KAi 9Z
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); |-?b)yuAz
CountCache.add(cb);
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out.print(CountCache.list.size()+"<br>"); x?$Y<=vT
CountControl c=new CountControl();
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c.run(); P=i |{vv(
out.print(CountCache.list.size()+"<br>"); NO&OuiN
%>