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: qY^OO~[
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CountBean.java Hggp*(AQK
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/* KMFvi_8
* CountData.java RzPqtN
* ";:"p6?
* Created on 2007年1月1日, 下午4:44 u=epnz:<
* n}NO"eF>-s
* To change this template, choose Tools | Options and locate the template under FjUf|
* the Source Creation and Management node. Right-click the template and choose 4.?tP7UE
* Open. You can then make changes to the template in the Source Editor. P+tnXT>nE
*/ zoFCHsr
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package com.tot.count; ;MD6iBD
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/** 5i 56J1EC
* CxyL'k
* @author 4~;x(e@S
*/ @m*^v\q<u
public class CountBean { J!l/!Z>!cF
private String countType; DEmU},<S
int countId; <B,z)c
/** Creates a new instance of CountData */ p[kEFE,%
public CountBean() {} nP9zTa
public void setCountType(String countTypes){ ko-:)z
this.countType=countTypes; /,G -1E
} wWaO"N]
public void setCountId(int countIds){ (_2;}eg
this.countId=countIds; )_$F/ug
} H}TzNs
public String getCountType(){ a>1_|QB.
return countType; XJ\j0
} xj/Iq<'R*O
public int getCountId(){ B]):$#{Rxl
return countId; 7WuhYJbf
} HvhP9_MB
} $JH_
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CountCache.java K0681_bp
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/* Q?e]N I^
* CountCache.java lIs<&-0
* v.wHj@
* Created on 2007年1月1日, 下午5:01 ^cQTRO|
* )vO?d~x|
* To change this template, choose Tools | Options and locate the template under :%&~/@B
* the Source Creation and Management node. Right-click the template and choose u ##.t
* Open. You can then make changes to the template in the Source Editor. [QC|Kd^#
*/ %XIPPEHU
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package com.tot.count; <F~0D0G
import java.util.*; t)O8ON
/** 5 iz(R:P<
* 5.1 c#rL
* @author y81B3`@
*/ kZ8+ev=
public class CountCache { e
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public static LinkedList list=new LinkedList(); "oZ$/ap\
/** Creates a new instance of CountCache */ })zYo 7
public CountCache() {} lwY2zX&%)/
public static void add(CountBean cb){ t-, =sV
if(cb!=null){ U_1syaY!
list.add(cb); #q[k"x=c
} *^]lFuX\&E
} :fxG]uf-P
} U9uy(KOW
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CountControl.java
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/* (5-4`:1ux
* CountThread.java 5Z2tTw'i
* O@$wU9D<
* Created on 2007年1月1日, 下午4:57 ]!v:xjzT
* @vy{Q7aM
* To change this template, choose Tools | Options and locate the template under z?9vbx
* the Source Creation and Management node. Right-click the template and choose BKiyog
* Open. You can then make changes to the template in the Source Editor. r`t|}m
*/ U64WTS@
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package com.tot.count; ,5tW|=0@
import tot.db.DBUtils; m^6& !`CD
import java.sql.*; -Fl;;jeX
/** y@\R$`0J
* 8&gr}r-
5
* @author s]D&):
*/ -!p +^wC
public class CountControl{ nPAVrDg
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private static long lastExecuteTime=0;//上次更新时间 g~>g])
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 )QeXA)
/** Creates a new instance of CountThread */ ~Ogtgr
public CountControl() {} 3hN.`G-E
public synchronized void executeUpdate(){ 9e`.H0
Connection conn=null; j,HUk,e^&
PreparedStatement ps=null; tC4:cX
try{ |H!kU.f]
conn = DBUtils.getConnection(); mBp3_E.t
conn.setAutoCommit(false); PNjZbOmzS
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); sYt\3/yL'
for(int i=0;i<CountCache.list.size();i++){ n0/H2>I[
CountBean cb=(CountBean)CountCache.list.getFirst(); n!nXM
CountCache.list.removeFirst(); k7R8Q~4
ps.setInt(1, cb.getCountId()); N-lo[bDJh
ps.executeUpdate();⑴ dKKh ^D`~
//ps.addBatch();⑵ 6}Iu~|5
} .Mn+Bd4f
//int [] counts = ps.executeBatch();⑶ eM3-S=R?<g
conn.commit(); jbDap i<
}catch(Exception e){ 4| 6<nk_
e.printStackTrace(); }D/O cp~o
} finally{ ]8Eci^i
try{ ZQ&A'(tt4
if(ps!=null) { %syFHUBw
ps.clearParameters();
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ps.close(); 47GL[ofY
ps=null; u]D>O$_ s
} Sqc
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}catch(SQLException e){} ?Re6oLm<B
DBUtils.closeConnection(conn); J ejDF*Q
} xK8n~.T('
} n$jOk
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public long getLast(){ MS_@
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return lastExecuteTime; li U=&wM>
} 5|4=uoA<
public void run(){ stb)Tl^
long now = System.currentTimeMillis(); ,b&-o?.{
if ((now - lastExecuteTime) > executeSep) {
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//System.out.print("lastExecuteTime:"+lastExecuteTime); w2
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//System.out.print(" now:"+now+"\n"); dG}.T_l
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); $>72 g.B
lastExecuteTime=now; POnI&y]
executeUpdate(); jJX-S
} (c'=jJX
else{ h1y6`m9
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); y .+d3
} lzKJy
} fs43\m4=m
} ]~')OSjw
//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 ZPM,ZGlu:
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类写好了,下面是在JSP中如下调用。 FXAP]iqo
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<% wRc=;f
CountBean cb=new CountBean(); Up(Jw-.
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 3eq VY0q
CountCache.add(cb); >N&C-6W
out.print(CountCache.list.size()+"<br>"); QGWfF,q
CountControl c=new CountControl(); h`_@eax
c.run(); @V9qbr=Z
out.print(CountCache.list.size()+"<br>"); /7bIE!Cn
%>