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: mxb(<9O
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CountBean.java zi`b2h
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/* 'RRmIx2X
* CountData.java -~?J+o+Pr"
* y_\p=0t8
* Created on 2007年1月1日, 下午4:44 9Gv[8'I
* 'YNT8w/3
* To change this template, choose Tools | Options and locate the template under ^Wxad?@
* the Source Creation and Management node. Right-click the template and choose >:D
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* Open. You can then make changes to the template in the Source Editor. ]|`Cuc
*/ !Mi;*ZR
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package com.tot.count; Q+g!V5'
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/** (Qa/EkE^*w
* 3nZo{p:E
* @author ,%\o4Rc'o
*/ \
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public class CountBean { sR/b$j>i3
private String countType; O'Js}
int countId; W6On93sa
/** Creates a new instance of CountData */ O_Oj|'bBC
public CountBean() {} Cvn#=6V3
public void setCountType(String countTypes){ ()~pY!)1/
this.countType=countTypes; 7S?4XyU/o
} \[Z?&
public void setCountId(int countIds){ .e_cgad :
this.countId=countIds; +$oF]OO
} ]\7]%(
public String getCountType(){ z5)s/;Sc
return countType; .'Y]R3\M+
} 31/Edd"]
public int getCountId(){ ^ f# FI&
return countId; os/vtyP:a
} [IK )
} R: l&2k@
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CountCache.java `uC@nJ
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/* ?O>V%@
* CountCache.java <=f}8a.R3
* 9K9DF1SOa
* Created on 2007年1月1日, 下午5:01 =i~}84>
* -jMJAYj V
* To change this template, choose Tools | Options and locate the template under G "73=8d
* the Source Creation and Management node. Right-click the template and choose lo[.&GD
* Open. You can then make changes to the template in the Source Editor.
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*/ 6`f2-f9%iq
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package com.tot.count; ,yd?gP-O
import java.util.*; E9~Ghx.
/** 33!oS&L
* o7|eMe?<t
* @author ]xuG&O"SBV
*/ trAkcYd
public class CountCache { <:?r:fQX
public static LinkedList list=new LinkedList(); OF\rgz
/** Creates a new instance of CountCache */ L'u\w
public CountCache() {} 2Lx3=[ik
public static void add(CountBean cb){ aG^4BpIP
if(cb!=null){ iezO9`
list.add(cb); k{'0[,mx#
} Yb E-6|cz
}
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} k1QpKn*
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CountControl.java j$+nKc$
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/* g1jTy7g?
* CountThread.java 5H ue7'LS
* 8 XU1/i7N
* Created on 2007年1月1日, 下午4:57 1Z9qjV%^
* >yULC|'F&~
* To change this template, choose Tools | Options and locate the template under 3`k;a1Z#O'
* the Source Creation and Management node. Right-click the template and choose {~F4WjHJp
* Open. You can then make changes to the template in the Source Editor. B[KJR?>
*/ aoXb2 2]{
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package com.tot.count; ;Rv!k&Df
import tot.db.DBUtils; 5O\*h;U 6
import java.sql.*; 3g >B"t
/** a[ex[TRKe
* _'(,
* @author uuQ(&
*/ o93`|yWl
public class CountControl{ 0zi~p>*nJC
private static long lastExecuteTime=0;//上次更新时间 $C `;fA
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 Z4lO?S5%J
/** Creates a new instance of CountThread */ YGrg
public CountControl() {} zRyuq1Zyc,
public synchronized void executeUpdate(){ gXjV?"^kUl
Connection conn=null; <kCU@SK
PreparedStatement ps=null; 3? HhG
try{ UXdUO@
conn = DBUtils.getConnection(); h@[R6G|
conn.setAutoCommit(false); )Q.>rX,F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 5=Di<! a;
for(int i=0;i<CountCache.list.size();i++){ [<6S%s
CountBean cb=(CountBean)CountCache.list.getFirst(); $g
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CountCache.list.removeFirst(); {HCzp,Y
ps.setInt(1, cb.getCountId()); a]MX)?
ps.executeUpdate();⑴ ?#45wC
//ps.addBatch();⑵ 7Zh~lM
} |>#{[wko
//int [] counts = ps.executeBatch();⑶ O<,\^[x
conn.commit(); k3uit+ge}
}catch(Exception e){ LbkF
e.printStackTrace(); GSRVe/[
} finally{ Pqn@ST
try{ ,]d,-)KX8
if(ps!=null) { g4l
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ps.clearParameters(); PF53mUs4
ps.close(); Jl&-,Vjb
ps=null; %oO4|JkJX
} }&[
}catch(SQLException e){} 4 XAQVq5
DBUtils.closeConnection(conn); sNLs\4v
} aXoVy&x=
} jJ5W>Q1mK$
public long getLast(){ K|Di1)7=/
return lastExecuteTime; v+X)Qmzf~
} 6#HK'7ClL
public void run(){ m_)FC-/pSl
long now = System.currentTimeMillis(); xjVS
if ((now - lastExecuteTime) > executeSep) { <UQe.K"
//System.out.print("lastExecuteTime:"+lastExecuteTime); !Y[lQXv
//System.out.print(" now:"+now+"\n"); XR;eY:89
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); eb =D/
lastExecuteTime=now; #':fkIYe'
executeUpdate(); {62n7'U{
} z&fwE$Nm
else{ yp({>{u7
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?]}8o}G
} FN8NTBk
} CL+}|7O(
} #N`~xZ|$
//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 *exS6@N]
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类写好了,下面是在JSP中如下调用。
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<% E6pMT^{K
CountBean cb=new CountBean(); 9T*v9d
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); FSA1gAW6g
CountCache.add(cb); '7iSp=
out.print(CountCache.list.size()+"<br>"); )3>hhuaa
CountControl c=new CountControl(); {qN 5MsY
c.run(); %'X[^W
out.print(CountCache.list.size()+"<br>"); D"a~#^
%>