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: ]Idk:et
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CountBean.java ^e _hLX\SW
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/* wr/"yQA]
* CountData.java qZtzO2Mt
* !mJ"gg
* Created on 2007年1月1日, 下午4:44 v!6
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* P6-s0]-g
* To change this template, choose Tools | Options and locate the template under DS(}<HK{
* the Source Creation and Management node. Right-click the template and choose 8B
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* Open. You can then make changes to the template in the Source Editor. qFCOUl
*/ %9F([K
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package com.tot.count; |O\s|H
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/** +US!YU
* :Uzm
* @author M#4pE_G
*/ )9{0]u;9
public class CountBean { \^J%sf${
private String countType; (&F}/s gbi
int countId; XH 4
/** Creates a new instance of CountData */ %+W{iu[|
public CountBean() {} |^"1{7)
public void setCountType(String countTypes){ )Xz,j9GzJS
this.countType=countTypes; eCU:Q
} "Y
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public void setCountId(int countIds){ .PIL
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this.countId=countIds; TCwFPlF|
} o4F2%0gJ
public String getCountType(){ s^G.]%iU
return countType; 3=P]x;[ba
} 6
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public int getCountId(){ NqazpB*
return countId; w7.V6S$Ga
} +K:Dx!9
} bQg:zww
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CountCache.java p J!
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/* OhQgF
* CountCache.java %op**@4/t\
* Q^9_'t}X
* Created on 2007年1月1日, 下午5:01 )Pa'UGY
* n`B:;2X,
* To change this template, choose Tools | Options and locate the template under Ct <udO
* the Source Creation and Management node. Right-click the template and choose H7&8\FNa
* Open. You can then make changes to the template in the Source Editor. *MhRW,=
*/ z;,u}u}aI
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package com.tot.count; Y1W1=Uc uk
import java.util.*; K,;E5
/** ?4#Li~q
* F4-$~v@
* @author TVtvuvQ2K
*/ In"ZIKaC
public class CountCache { @su^0 9n
public static LinkedList list=new LinkedList(); |/|5UiX7
/** Creates a new instance of CountCache */ b5dD/-Vj
public CountCache() {} 7UKh688
public static void add(CountBean cb){ KI iO
if(cb!=null){ g#pr yYz
list.add(cb); O-0x8 O^B
}
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} r,8 [O
} 5FPM`hLT
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CountControl.java MO]F1E?X
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/* #>("CAB02T
* CountThread.java ~|DUt
* UawyDs
* Created on 2007年1月1日, 下午4:57 YlJ@XpKM
* lV3x *4O=
* To change this template, choose Tools | Options and locate the template under Fh&G;aEq
* the Source Creation and Management node. Right-click the template and choose Fc)@,/R"v
* Open. You can then make changes to the template in the Source Editor. 9rA0lqr]5
*/ PfAgM1
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package com.tot.count; $D~0~gn~
import tot.db.DBUtils; !3c\NbU
import java.sql.*; 1Z/(G1
/** 13$%,q)
* g]l''7G
* @author cN-?l7
*/ gS!:+G%
public class CountControl{ t9GR69v:?
private static long lastExecuteTime=0;//上次更新时间 ^,lIK+#Elz
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ehGLk7@7&
/** Creates a new instance of CountThread */ HYD'.uj
public CountControl() {} htO+z7
public synchronized void executeUpdate(){ s0TORl6Z|
Connection conn=null; : %_LpZ
PreparedStatement ps=null; g{]0sn#
try{ 8rAg\H3E
conn = DBUtils.getConnection(); ,\W 8b-Z
conn.setAutoCommit(false); -lr
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); [r\Du|R-*
for(int i=0;i<CountCache.list.size();i++){ A_"w^E{P
CountBean cb=(CountBean)CountCache.list.getFirst(); &)#
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CountCache.list.removeFirst(); niMsQ
ps.setInt(1, cb.getCountId()); ;0]aq0_#(
ps.executeUpdate();⑴ xk9%F?)
//ps.addBatch();⑵ IEL%!RFG
} */5d>04
//int [] counts = ps.executeBatch();⑶
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conn.commit(); .Bl\Z
}catch(Exception e){ XFVE>/H
e.printStackTrace(); fh&nu"&
} finally{ {Y(zd[
try{ yM6pd U]i
if(ps!=null) { Z\bmW%av
ps.clearParameters(); <yV"6/l0
ps.close(); ,i^9 |Oeq
ps=null; Ljm[?*H#
} V@.Ior}w
}catch(SQLException e){} IkL#SgY
DBUtils.closeConnection(conn); o)M}!MT
} >jDDQ@
} l5Ui w2
public long getLast(){ <`8n^m*
return lastExecuteTime; t5^{D>S1
} %?1ew
public void run(){ rK8lBy:<
long now = System.currentTimeMillis(); nmee 'oEw
if ((now - lastExecuteTime) > executeSep) { ol\Utq,
//System.out.print("lastExecuteTime:"+lastExecuteTime); %Bj\W'V&p
//System.out.print(" now:"+now+"\n"); "@^k)d$
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); np|Sy;:
lastExecuteTime=now; f=+mIZ
executeUpdate(); `$Y.Y5mGtJ
} &~cBNw|
else{ WMDl=6
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); g i3F`
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} /cUO$m o
} @W.S6;GA\
} <q58uuK
//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 ^`i#$
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类写好了,下面是在JSP中如下调用。 :I] Mps<
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<% X;+sUj8
CountBean cb=new CountBean(); ~Py`P'+
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); ;DQ ZT
CountCache.add(cb); wA ,6bj
out.print(CountCache.list.size()+"<br>"); *xAqnk
CountControl c=new CountControl(); ~f2z]JLr:
c.run(); x`eo"5.$
out.print(CountCache.list.size()+"<br>"); 1 &jc/*Z"
%>