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: 8>trS=;n
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CountBean.java Qiua
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/* KK1gNC4R
* CountData.java "9m2/D`=
* 3p39`"~
* Created on 2007年1月1日, 下午4:44 yWg@v+
* $*SW8'],`
* To change this template, choose Tools | Options and locate the template under LIS)(X<]?
* the Source Creation and Management node. Right-click the template and choose Hc!
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* Open. You can then make changes to the template in the Source Editor. !9u|fnC9
*/ GQ t8p[!
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package com.tot.count; w zYzug
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/** I(]}XZq
* G^~k)6v=m
* @author R{WE\T '
*/ P?8GV%0$
public class CountBean { 8J=?5
private String countType; "8c@sHk(w
int countId; fRrvNj0{V
/** Creates a new instance of CountData */ {E
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public CountBean() {} !g?|9
public void setCountType(String countTypes){ s:OFVlC%\
this.countType=countTypes; CpA|4'#
} @>d*H75
public void setCountId(int countIds){ m`v2: S}
this.countId=countIds; NiWa7 /Hr
} ^M3~^lV
public String getCountType(){ @E^~$-J5j
return countType; 8}c$XmCM
} <A[E:*`*
public int getCountId(){ VO,!x~S!
return countId; )hd@S9Z.Y
} `NnUyQ;T
} TMAJb+@l:
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CountCache.java qHsUP;7
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/* Ipf|")*
* CountCache.java G'rxXJq
* _wC3kAO
* Created on 2007年1月1日, 下午5:01 CAWA3fcQp
* 0Oi,#]F
* To change this template, choose Tools | Options and locate the template under oeKHqP wg
* the Source Creation and Management node. Right-click the template and choose wHsYF`
* Open. You can then make changes to the template in the Source Editor. 8MK>)P o)
*/ p`mS[bxv!
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package com.tot.count; J cg,#@
import java.util.*; *"R|4"uy
/** $.C=H[QC
* rFIqC:=
* @author {n(b{ibl
*/ e`@ # *}A
public class CountCache { oE<`VY|
public static LinkedList list=new LinkedList(); w3#Wh|LQ-
/** Creates a new instance of CountCache */ W@ T~ly;e*
public CountCache() {} V\6=ySx
public static void add(CountBean cb){ $i&e[O7T;
if(cb!=null){ ie;]/va
list.add(cb); un shH <
} 1)9sf0LyU
} ]Gpxhg
} >C7r:%
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CountControl.java _ 6O\W%it
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/*
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* CountThread.java @WJgWJm
* 0FGe=$vD
* Created on 2007年1月1日, 下午4:57 s<*XNNE7
* 1lq(PGX)
* To change this template, choose Tools | Options and locate the template under 0rh]]kj
* the Source Creation and Management node. Right-click the template and choose wkP#Z"A0~
* Open. You can then make changes to the template in the Source Editor. |B.0TdF
*/ lFa02p0
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package com.tot.count; kV?y0J.
import tot.db.DBUtils; >GQEqXs
import java.sql.*; wyp|qIS;
/** 4/mig0"N.
* g1XZ5P} f
* @author `1'6bp`Z
*/ I*LknU@
public class CountControl{ #rxVd
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private static long lastExecuteTime=0;//上次更新时间 dOqOw M.y
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 `n$I]_}/%
/** Creates a new instance of CountThread */ M9EfU
public CountControl() {} +cIUGFp}
public synchronized void executeUpdate(){ , 3,gG"
Connection conn=null; '#s05hr
PreparedStatement ps=null; g$HwxA9Gp/
try{ thV>j9'
conn = DBUtils.getConnection(); W)9K`hM6
conn.setAutoCommit(false); e"/;7:J5\
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ;epV<{e$q4
for(int i=0;i<CountCache.list.size();i++){ "[vu6 `m?
CountBean cb=(CountBean)CountCache.list.getFirst(); /3;4#:Kkw
CountCache.list.removeFirst(); S?RN?1
ps.setInt(1, cb.getCountId()); )A!>=2M`
ps.executeUpdate();⑴ 9l}FU$
//ps.addBatch();⑵ %{YN70/
} $"0M U
//int [] counts = ps.executeBatch();⑶ |o,8V p
conn.commit(); )_{dWf1
}catch(Exception e){ Z^V6K3GSz-
e.printStackTrace(); ~GTz:nC*
} finally{ ~7Ts_:E-
try{ mu?Eco`~
if(ps!=null) { )\sc83L
ps.clearParameters(); ,$;yY)x7U
ps.close(); 20vXSYa~
ps=null; bA=
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} G:<`moKgL
}catch(SQLException e){} 7nHF@Y|*"
DBUtils.closeConnection(conn); J\d3N7_d
} U"q/rcA
} A:aE|v/T&
public long getLast(){ .jS~By|r
return lastExecuteTime; \zieyE
} CLeG<Hi
~
public void run(){ /DQc&.jK
long now = System.currentTimeMillis(); _u{c4U0,
if ((now - lastExecuteTime) > executeSep) { [QMu2
//System.out.print("lastExecuteTime:"+lastExecuteTime); m-H-6`]
//System.out.print(" now:"+now+"\n"); AK\$i$@6
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ._8KsuJG
lastExecuteTime=now; .uyGYj-C
executeUpdate(); p[<Dk$7K
} _/Gczy4)#
else{ D|rFu
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Z-E`>
} @?=|Y
} -:30:oq
} 43={Xy
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 r`AuvwHPs[
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类写好了,下面是在JSP中如下调用。 :!5IW?2
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<% BYs-V:
CountBean cb=new CountBean(); }
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); vz^<YZMu
CountCache.add(cb); \"CZI<=TB
out.print(CountCache.list.size()+"<br>"); Nc+,&R13m
CountControl c=new CountControl(); T.Ryy"%F
c.run(); .q[SI$qO/
out.print(CountCache.list.size()+"<br>"); :T]o)
%>