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: 4dD@lG~
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CountBean.java 'kONb
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/* u/{_0-+P
* CountData.java K|' ]Hje\
* qm&53
* Created on 2007年1月1日, 下午4:44 $EHn;~w T
* Ns7l-mb
* To change this template, choose Tools | Options and locate the template under J,2v~Dq
* the Source Creation and Management node. Right-click the template and choose ',-X#u
* Open. You can then make changes to the template in the Source Editor. (fjXp75
*/ C
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package com.tot.count; -T="Ml&
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/** X]qp~:4G
* kO\&mL&
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* @author ZI:d&~1i1
*/ %L,,
public class CountBean { ,Y/>*,J
private String countType; c\?/^xr'!}
int countId; Mh@ylp+q
/** Creates a new instance of CountData */ _:z;j{@4
public CountBean() {} %li{VDb
public void setCountType(String countTypes){ PYRwcJ$b\d
this.countType=countTypes; *g_>eNpXD
} dL Py%q
public void setCountId(int countIds){ R=f5:8D<-
this.countId=countIds; 9bYHb'70
} Boz_*l|
public String getCountType(){ O9 r44ww
return countType; ?Pf
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} OaVL NA^{
public int getCountId(){ <@2?2l+`X
return countId; /? <9,7#i
} Sf8Xj|u
} iO#xIl<
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CountCache.java z:q'?{`I
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/* e}@J?tJK.L
* CountCache.java < 2r#vmM
* <L[)P{jn?p
* Created on 2007年1月1日, 下午5:01 H "/e%
* w@D@,q'x
* To change this template, choose Tools | Options and locate the template under >}`1'su
* the Source Creation and Management node. Right-click the template and choose !Kn+*' #
* Open. You can then make changes to the template in the Source Editor. hYQ%|CBXBR
*/ ).6/ii9gt
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package com.tot.count; %JU23c*
import java.util.*; A^jm<~
/** |[t=.dK%
* 8&AorYw[
* @author Z\yLzy#8
*/ D.JVEKLkU
public class CountCache { x~I1(l7r
public static LinkedList list=new LinkedList(); VY26Cf"
/** Creates a new instance of CountCache */ HCCp<2D"C
public CountCache() {} A.*nDl`H
public static void add(CountBean cb){ Hqy>!1!
if(cb!=null){ V'#u_`x"D)
list.add(cb); 8TM=AV
} K*D]\/; ^
} ^,r;/c9A8
} NWX%0PGZ
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CountControl.java Pg}G4L?H;J
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/* 0md{e`'q:
* CountThread.java $e,!fB;B
* x=<>%m5R
* Created on 2007年1月1日, 下午4:57 }|,\?7,
* KPK!'4,cu
* To change this template, choose Tools | Options and locate the template under 3om7LqcRo
* the Source Creation and Management node. Right-click the template and choose U-:Z^+Y
* Open. You can then make changes to the template in the Source Editor. YS6az0ie
*/ PhL5EYn
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package com.tot.count; :D7!6}%
import tot.db.DBUtils; xL#oP0d<e
import java.sql.*; 0([jD25J!
/** 9Ei#t FMc
* un%"s:
* @author 7Et(p'
*/ ?n~j2-[<
public class CountControl{ 6@361f[
private static long lastExecuteTime=0;//上次更新时间 ~H."{
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 jYx(
/** Creates a new instance of CountThread */ 7q=xW6
public CountControl() {} |#,W3Ik(l
public synchronized void executeUpdate(){ 2Nzcej
Connection conn=null; 1e%Xyqb
PreparedStatement ps=null; M& L0n%,y5
try{ MH(g<4>*
conn = DBUtils.getConnection(); FC.-u"V
conn.setAutoCommit(false); SQvB)NOw
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); EnAw8Gm*
for(int i=0;i<CountCache.list.size();i++){ )W3l{T(
CountBean cb=(CountBean)CountCache.list.getFirst(); a];i4lt(c
CountCache.list.removeFirst(); ,RH986,6V
ps.setInt(1, cb.getCountId()); O\{_)L
ps.executeUpdate();⑴ zL}DLfy>R
//ps.addBatch();⑵ uU"s50m
} V,,iKr@TG
//int [] counts = ps.executeBatch();⑶ p{GDW_
conn.commit(); ~UFsi VpL
}catch(Exception e){ mjc:0hH
e.printStackTrace(); 09i[2n;O
} finally{ [^P2Kn
try{ iIRigW
if(ps!=null) { !7|9r$
ps.clearParameters(); BE;iC.rW
ps.close(); #J9XcD{1
ps=null; 1@Gv`{v
} dg<fUQ
}catch(SQLException e){} $*> _0{<
DBUtils.closeConnection(conn); KL{uhb0f
} \}c50}#0
} lsf?R'1
public long getLast(){ nQMN2j M
return lastExecuteTime; -I<`!kH*
} o?\Pw9Y
public void run(){ AX?6Q4Gq1
long now = System.currentTimeMillis(); oDK\v8w-
if ((now - lastExecuteTime) > executeSep) { 7qp|Msf},
//System.out.print("lastExecuteTime:"+lastExecuteTime); 6YbSzx`?k
//System.out.print(" now:"+now+"\n"); I>|?B(F
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); `_kRvpi
lastExecuteTime=now; 5T*7HC[
executeUpdate(); ,]'!2?
} 3j#F'M)s{
else{ *2hzReM
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Cl=ExpX/O
} m#P&Yd4T
} )`0 j\
} eGg#=l=
//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 1Tkz!
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类写好了,下面是在JSP中如下调用。 0cVXUTJ|W
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<% ggWfk
CountBean cb=new CountBean(); B(U`Zd
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \v_(*
CountCache.add(cb); $Vh82Id^
out.print(CountCache.list.size()+"<br>"); %kT:"j(xW
CountControl c=new CountControl(); 2sH5<5G'
c.run(); nz+KA\iW
out.print(CountCache.list.size()+"<br>"); nXjUTSGa)
%>