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: ,S
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CountBean.java ^#e|^]]
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/* kdGq\k,
* CountData.java ^C~_}/cZ
* Xa>'DO2
* Created on 2007年1月1日, 下午4:44 om`B:=+
* ygja{W.
* To change this template, choose Tools | Options and locate the template under RTd,bi*
* the Source Creation and Management node. Right-click the template and choose -`Z!p
* Open. You can then make changes to the template in the Source Editor. 1mtYap4
*/ 0sw;h.VY
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package com.tot.count; sM)1w-
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/** |H5GWZ
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* TtrO _D
* @author c oZK
*/ $s1/Rmw
public class CountBean { Q}\\0ajS)
private String countType; Zbre5&aU
int countId; `'iO+/;GY
/** Creates a new instance of CountData */ m.ka%h$
public CountBean() {} r$4d4xtK
public void setCountType(String countTypes){ E7R%G OH
this.countType=countTypes; O{c#&/ .K
} Pw]+6
public void setCountId(int countIds){ _oa*E2VN
this.countId=countIds; $'>iNMtK{p
} .?APDr"QQH
public String getCountType(){ I*f@^(
return countType; >3b<
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} '$p`3Oqi
public int getCountId(){ 56kqG}mg&
return countId; 'W9[Vm
} qF(i1#
} sd+_NtH
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CountCache.java Qh8pOUD0l}
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/* W!" $g
* CountCache.java @6~m&$R/
* ;,]4A{|
* Created on 2007年1月1日, 下午5:01 k9H}nP$F
* qB@N|Bb
* To change this template, choose Tools | Options and locate the template under $;=^|I4E
* the Source Creation and Management node. Right-click the template and choose on8$Kc
* Open. You can then make changes to the template in the Source Editor. /oEDA^qx
*/ n4{?Odrf
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package com.tot.count; CTg79
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import java.util.*; %}N01P|X>
/** y"Fu=
* tkptm%I_
* @author '6\w4J(
*/ hJ%$Te
public class CountCache { f:P;_/cJc
public static LinkedList list=new LinkedList(); lz>.mXdx
/** Creates a new instance of CountCache */ v h)CB8
public CountCache() {} $_'<kH-eP
public static void add(CountBean cb){ ncUhCp?'
if(cb!=null){ ->{\7|^
list.add(cb); )!VJ\
} $SA
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} :rufnmsP<U
} 4Hyp]07
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CountControl.java )xg8#M=K
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/* ZBU<L+#
* CountThread.java krlebPs[
* elKp?YN
* Created on 2007年1月1日, 下午4:57 IAb.Z+ig
* c"CR_
* To change this template, choose Tools | Options and locate the template under o:5mgf7
* the Source Creation and Management node. Right-click the template and choose PQF
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* Open. You can then make changes to the template in the Source Editor. qD"~5vtLqQ
*/ 7,?ai6{
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package com.tot.count; JB5%\
import tot.db.DBUtils; .8'uIA{_2
import java.sql.*; 32j#kJ W
/** 9ec#'i=
* 5xUZeLj
* @author ey<z#Q5+
*/ 4R01QSbd
public class CountControl{ fCs{%-6cP
private static long lastExecuteTime=0;//上次更新时间 75P!`9bE
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 -;
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/** Creates a new instance of CountThread */ 96!2@c{
public CountControl() {} XF3lS#pt
public synchronized void executeUpdate(){ {<Y!'WL{
Connection conn=null; r4 5}o
PreparedStatement ps=null; !p36OEx
try{ h;(mb2[R
conn = DBUtils.getConnection(); lt5Knz2G,Z
conn.setAutoCommit(false); (?T{^Hg
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3-;<G
for(int i=0;i<CountCache.list.size();i++){ &C9)%5O)
CountBean cb=(CountBean)CountCache.list.getFirst(); .
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CountCache.list.removeFirst(); $i3`cX)g
ps.setInt(1, cb.getCountId()); GX.a!XQ@!
ps.executeUpdate();⑴ (Cti,g~
//ps.addBatch();⑵ meap ;p
} S n~P1C
//int [] counts = ps.executeBatch();⑶ ~S
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conn.commit(); ]5j>O^c<
}catch(Exception e){ }HbUB$5
e.printStackTrace(); `5x0p a
} finally{ Xk/:a}-l
try{ +-V4:@
if(ps!=null) { mMu+MXTk<
ps.clearParameters(); #MMp0
ps.close(); R5},E
ps=null; O#8lJ%?
} X,8Zn06M
}catch(SQLException e){} _-v$fDrz
DBUtils.closeConnection(conn); 7oL:C
} (o\D=!a
} ,( hP /<
public long getLast(){ vON7~KA
return lastExecuteTime; #~|esr/wf
} Mg^A,8lrm
public void run(){ YWANBM(v+
long now = System.currentTimeMillis(); Csgby(D*O
if ((now - lastExecuteTime) > executeSep) { =@P(cFJ/
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9CIQRc
//System.out.print(" now:"+now+"\n"); .v=n-k7
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ZWB3R
lastExecuteTime=now; 8_rd1:t5
executeUpdate(); eq2LV=d{m
} .o<9[d"
else{ p[!9 objU
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); YAi@EvzCVy
} 9(a*0H
} Q"LlBp>t|#
} MpJ3*$Dr
//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 E%f!SD
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类写好了,下面是在JSP中如下调用。 C}o^p"M*B3
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<% +&1#ob"6lq
CountBean cb=new CountBean();
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cb.setCountId(Integer.parseInt(request.getParameter("cid"))); .b2%n;_>.
CountCache.add(cb); 'Ze&
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out.print(CountCache.list.size()+"<br>"); ~dsx|G?p
CountControl c=new CountControl(); [H`5mY@
c.run(); -HFyNk]>
out.print(CountCache.list.size()+"<br>"); fB4zqMSfE
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