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: ?0%yDq1_
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CountBean.java un{LwZH
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/* 9M3XHj
* CountData.java F iZe4{(p
* -YF]k}|
* Created on 2007年1月1日, 下午4:44 ,>6s~'
* &xKln1z'
* To change this template, choose Tools | Options and locate the template under rJ2yi6TB\
* the Source Creation and Management node. Right-click the template and choose \'z&7;px
* Open. You can then make changes to the template in the Source Editor. *v+xKy#M
*/ lTl-<E;
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package com.tot.count; 7 &y'\
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/** T%{qwZc+mJ
* `Sh#>
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* @author ElJM.
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*/ ~p9nAACU
public class CountBean { g_<^kg"
private String countType; vM_UF{a$=
int countId; LxWnPi ^
/** Creates a new instance of CountData */ eko$c,&jY
public CountBean() {} -6wjc rTD
public void setCountType(String countTypes){ V6opV&
this.countType=countTypes; nVkPYeeT
} J2rw4L
public void setCountId(int countIds){ 3v~804kWB
this.countId=countIds; JmHEYPt0
} +n]z'pijb
public String getCountType(){ nE_g^
return countType; Ce:2Tw
} U^ bF}4m
public int getCountId(){ %Vf3r9
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return countId; @'go?E)f
} 99GzhX_
} zcF`Z{&+
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CountCache.java (o+(YV^
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/* $
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* CountCache.java tOQ2947zk
* dMo456L
* Created on 2007年1月1日, 下午5:01 A .]o&S}
* CC?L~/gPN
* To change this template, choose Tools | Options and locate the template under {s ]yP_
* the Source Creation and Management node. Right-click the template and choose ${(c`X
* Open. You can then make changes to the template in the Source Editor. k!9LJ%Xh
*/ AoL2Wrk]\B
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package com.tot.count; H0!W:cIS;l
import java.util.*; ]yc&ffe%
/** ="~yD[S
* teRK#: .P
* @author Ancka
*/ %9bf^LyD
public class CountCache { "x;|li3;
public static LinkedList list=new LinkedList(); K) e;*D
/** Creates a new instance of CountCache */ 0l.\KF
public CountCache() {} '/2u^&W
public static void add(CountBean cb){ pDw^~5P
if(cb!=null){ ,C4gA(')K
list.add(cb); |wef [|@%
} |f9fq~'1e
} w(>mP9Cb
} 33O O%rWi
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CountControl.java $2tPqZ>
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/* -SyQ`V)T7N
* CountThread.java PWavq?SR
* s{QS2G$5
* Created on 2007年1月1日, 下午4:57 0a1Vj56{)
* #*J+4aw3
* To change this template, choose Tools | Options and locate the template under 2u B66i
* the Source Creation and Management node. Right-click the template and choose `$kKTc:f
* Open. You can then make changes to the template in the Source Editor. @51!vQwqR
*/ #Cj$;q{!
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package com.tot.count; %jS#DVxBR
import tot.db.DBUtils; 8eAc 5by
import java.sql.*; #YABbwH
/** u~JCMM$
* hxt,%al
* @author g}uVuK;<
*/ WTlR>|Zdn
public class CountControl{ **RW
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private static long lastExecuteTime=0;//上次更新时间 bcVzl]9
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 #$W bYL|
/** Creates a new instance of CountThread */ \Z?.Po`!j
public CountControl() {} at N%csA0
public synchronized void executeUpdate(){ W
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Connection conn=null; rM|] }M=_V
PreparedStatement ps=null; ~~8?|@V
try{ k&<cFZU
conn = DBUtils.getConnection(); be@\5
conn.setAutoCommit(false); \J)ffEKIp
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); A2C|YmHk
for(int i=0;i<CountCache.list.size();i++){ }DCR(p rD
CountBean cb=(CountBean)CountCache.list.getFirst(); $e99[y@
CountCache.list.removeFirst(); >vr!3
ps.setInt(1, cb.getCountId()); S2^Ckg
ps.executeUpdate();⑴ IY* ~df
//ps.addBatch();⑵ 4`KQ@m
} W*S!}ZT`
//int [] counts = ps.executeBatch();⑶ ;!k{{Xndd
conn.commit(); gwm}19JC
}catch(Exception e){ f:w#r.]
e.printStackTrace();
!623;
} finally{ hny(:Dj
try{ @i" ^b
if(ps!=null) { t;>"V.F<1
ps.clearParameters(); 4E"OD+
ps.close(); J|'e.1v
ps=null; r.JY88"
} $y2"Q,n+
}catch(SQLException e){} G$P|F6
DBUtils.closeConnection(conn); nVSuvq|S
} xJ0Q8A
} ;z>?-
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public long getLast(){ Z`W@Od$f
return lastExecuteTime; v/1&V+"^kd
} ^GS,4[)H
public void run(){ Boi?Bt
long now = System.currentTimeMillis(); %T_4n^beFQ
if ((now - lastExecuteTime) > executeSep) { @u4q\G\
//System.out.print("lastExecuteTime:"+lastExecuteTime); \!]Zq#*kH
//System.out.print(" now:"+now+"\n"); 4R;6u[a]u
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); |afzW=8'
lastExecuteTime=now; [~%\:of70n
executeUpdate(); <"&I'9
} o<pb!]1
else{ G`Ix-dADJm
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); =7*k>]o
} vWGjc2_
} j/C.='?%
} ;Wo\MN
//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 +!'rwD
/q3]AVV
类写好了,下面是在JSP中如下调用。 eM>f#M
#]vy`rv
<% !)nA4l=S#
CountBean cb=new CountBean(); :(^,WOf
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Sz"rp9x+
CountCache.add(cb); f0<'IgN
out.print(CountCache.list.size()+"<br>"); x|TLMu=3=
CountControl c=new CountControl(); qh40nqS;9
c.run(); L_k'r\L
out.print(CountCache.list.size()+"<br>"); =Nc}XFq
%>