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: m!HJj>GEo
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CountBean.java 6(ol1
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/* C]A.i2o8
* CountData.java yD}B%\45
* \
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* Created on 2007年1月1日, 下午4:44 k;FUs[
* 3)ywX&4"L
* To change this template, choose Tools | Options and locate the template under ^k9I(f^c-_
* the Source Creation and Management node. Right-click the template and choose wI/iuc
* Open. You can then make changes to the template in the Source Editor. -ZLJeY L
*/ #KZBsa@p
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package com.tot.count; $6SW;d+>n
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/** Ds:'Lb
* rFL;'Cj@
* @author t1x1,SL
*/ j&qub_j"xX
public class CountBean { %1+4_g9
private String countType; ~Z'?LV<t
int countId; )+9Uoe~6
/** Creates a new instance of CountData */ $~T4hv :
public CountBean() {} <wD-qT W
public void setCountType(String countTypes){
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this.countType=countTypes; nAdf=D'P
} $f7l34Sf3
public void setCountId(int countIds){ u]UOSf n
this.countId=countIds; g[4WzDF*
} DSn_0D
public String getCountType(){ kE1TP]|
return countType; }k.Z~1y
} ncT&Gr
public int getCountId(){ '6%2.[o
return countId; `e}B2;$A3
} K]w'&Qm8W
} "3Y0`&:D
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CountCache.java 6.yu-xm
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/* o?Oc7$+u
* CountCache.java 7HYwLG:\~
* @f3E`8
* Created on 2007年1月1日, 下午5:01 %d9uTm;
* eTcd"Kd/
* To change this template, choose Tools | Options and locate the template under S3Jo>jXS "
* the Source Creation and Management node. Right-click the template and choose @`9]F7h5W
* Open. You can then make changes to the template in the Source Editor. wN~_v-~*Q
*/ .HABNPNg(
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package com.tot.count; $/Uq0U
import java.util.*; a0)QH
/** !R`{ TbN
* ~*];pV]A[
* @author $6R-5oQ
*/ 5]:U9ts#
public class CountCache { j^RmrOg,
public static LinkedList list=new LinkedList(); NC6&x=!3
/** Creates a new instance of CountCache */ H3-hcx54T
public CountCache() {} e~"U @8xk~
public static void add(CountBean cb){ ;#< 0<
if(cb!=null){ 19%imf
list.add(cb); \1M4Dl5!
} 0?|<I{z2
} NL+N%2XG7
} wi{3/
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CountControl.java +X
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/* ]u/sphPe
* CountThread.java h^P#{W!e\
* 1<aP92/N&
* Created on 2007年1月1日, 下午4:57 `r 4fm`<
* XC#oB~K'
* To change this template, choose Tools | Options and locate the template under 7D_=
* the Source Creation and Management node. Right-click the template and choose $U-0)4yf
* Open. You can then make changes to the template in the Source Editor. vo{--+{ky!
*/ %JTpI`
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package com.tot.count; t\O16O7S
import tot.db.DBUtils; 4Ftu
import java.sql.*; N!tX<u~2
/** R[+<^s}p/
* SOaoo^,O
* @author <qt|d&
*/ +R75v )
public class CountControl{ TIg3`Fon
private static long lastExecuteTime=0;//上次更新时间 }"%N4(Kd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 &=mtc%mL
/** Creates a new instance of CountThread */ 6j|{`Zd)G
public CountControl() {} j3ls3H&
public synchronized void executeUpdate(){ (S Yln>o
Connection conn=null; gbD KE{
PreparedStatement ps=null; 2y1Sne=<Kb
try{ HTTCTR
conn = DBUtils.getConnection(); lPAQ3t!,
conn.setAutoCommit(false); SSzIih@u
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,|/f`Pl
for(int i=0;i<CountCache.list.size();i++){ X2'0PXv>!
CountBean cb=(CountBean)CountCache.list.getFirst(); &mM0AA'\?H
CountCache.list.removeFirst(); Q22 GIr
ps.setInt(1, cb.getCountId()); +&H4m=D-#a
ps.executeUpdate();⑴ E' uZA
//ps.addBatch();⑵ ;}p
} *|HY>U.
//int [] counts = ps.executeBatch();⑶ A^S gI-y|
conn.commit(); G=bCNn<
}catch(Exception e){ ?+8\.a!
e.printStackTrace(); .*Qx\,
} finally{ z\4.Gm-
try{ j B{8u&kz)
if(ps!=null) { X2"/%!65{
ps.clearParameters(); :[d9tm
ps.close(); u)Whr@m
ps=null; ;<4a*;IO
} `XDl_E+>l
}catch(SQLException e){} l;E(I_
i)
DBUtils.closeConnection(conn); RPbZ(.
} F((4U"
} #T"4RrR
public long getLast(){ )Q JUUn#
return lastExecuteTime; \z ) %$#I
} NwfVL4Xg
public void run(){ g0E'g
long now = System.currentTimeMillis(); QTnP'5y
if ((now - lastExecuteTime) > executeSep) { #lO Mm9
//System.out.print("lastExecuteTime:"+lastExecuteTime); ?\n>
AC
//System.out.print(" now:"+now+"\n"); y>ktcuML
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ~F#j#n(=`q
lastExecuteTime=now; ez[Vm:2K
executeUpdate(); -tU'yKhn
} lk =<A"^S
else{ !ubD/KE
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 2 ? 4!K.
} Ws12b$
} YchH~m|
} c1gQ cqF
//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 #s9aI_
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类写好了,下面是在JSP中如下调用。 Kf-JcBsrT
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<% H0cA6I
CountBean cb=new CountBean(); L\iFNT}g`
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \^1E4C\":
CountCache.add(cb); @KUWxFak
out.print(CountCache.list.size()+"<br>"); L4l!96]a
CountControl c=new CountControl(); yF/j Fn
c.run(); m)D|l1AtF
out.print(CountCache.list.size()+"<br>"); {7pli{`
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