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: Xl |1YX1&m
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CountBean.java wyxGe<1
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/* :RxHw;!
* CountData.java s,*c@1f?
* l]2r)!Q7
* Created on 2007年1月1日, 下午4:44 4y}"Hy
* (/" &
* To change this template, choose Tools | Options and locate the template under ?v}Bd!'+P
* the Source Creation and Management node. Right-click the template and choose '[ P}&<ie,
* Open. You can then make changes to the template in the Source Editor. P
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*/ 3UUGblg`~
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package com.tot.count; 1+y"i<3)
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/** ?lCd{14Mkh
* w-N1.^
* @author @LD6:gy
*/ Lp:6 ;
public class CountBean { >n.z)ZJ
private String countType; -qV{WZ Hp
int countId; FdOFE.l
/** Creates a new instance of CountData */ ;/AG@$)
public CountBean() {} TB
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public void setCountType(String countTypes){ O';ew)tI
this.countType=countTypes; Ja^ 5?Ar|
} @nV5.r0W}B
public void setCountId(int countIds){ !{_yaVF
this.countId=countIds; ;eB ~H[S/
} 9vGs;
public String getCountType(){ mjnUs-`W|
return countType; HO|-@yOF^
} xcCl
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public int getCountId(){ |E/L.gdP7
return countId; 7_KhV
} (d2@Mz
} q$ghLGz
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CountCache.java @fn6<3
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/* =
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* CountCache.java `kBnSi o~
* i&+w _hD
* Created on 2007年1月1日, 下午5:01 >N`6;gn*l
* =)<3pG O
* To change this template, choose Tools | Options and locate the template under #'o7x'n^
* the Source Creation and Management node. Right-click the template and choose msTB'0
* Open. You can then make changes to the template in the Source Editor. Vj^dD9:
*/ ('o&Q_
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package com.tot.count; M7y|EB))
import java.util.*; )xl6,bq3
/** <ZPZk'53<f
* +S {
* @author cHvF* A
*/ T.?k>Ak
public class CountCache { /nB'kg[h\
public static LinkedList list=new LinkedList(); uOk%AL>
/** Creates a new instance of CountCache */ 4B O %{
public CountCache() {} @6xGJ,s
public static void add(CountBean cb){ 89eq[ |G_
if(cb!=null){ d;suACW
list.add(cb); 0my9l;X
} ~\_T5/I%
} .{rbw9
} H"YL
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CountControl.java <4?*$
} ~enEZ
/* %JoxYy-
* CountThread.java 6nw&$I
* ,a(O`##Bn
* Created on 2007年1月1日, 下午4:57 Wpm9`K
* H*!5e0~rR
* To change this template, choose Tools | Options and locate the template under 4Z%Y"PL(K
* the Source Creation and Management node. Right-click the template and choose X.J
* Open. You can then make changes to the template in the Source Editor. /#q")4Mf
*/ /(6zsq'v|
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package com.tot.count; Z$2L~j"=!
import tot.db.DBUtils; ]if;A ) '
import java.sql.*; 6&!l'[hU
/** (.^8^uc7X
* -Ds|qzrN%
* @author m4**>!I
*/ %jKH?%Ih
public class CountControl{ U~QMR-bz
private static long lastExecuteTime=0;//上次更新时间 23E0~O
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5d
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/** Creates a new instance of CountThread */ =:5<{J OG
public CountControl() {} a&5g!;.
public synchronized void executeUpdate(){ APHPN:v
Connection conn=null; h(:<(o@<
PreparedStatement ps=null; VO9f~>`(
try{ D!l8l49hLu
conn = DBUtils.getConnection(); g,?\~8-c
conn.setAutoCommit(false); !k h{9I>M
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); $N\+,?
for(int i=0;i<CountCache.list.size();i++){ M/w{&&
CountBean cb=(CountBean)CountCache.list.getFirst(); gX/NtO%
CountCache.list.removeFirst(); {[3YJkrM
ps.setInt(1, cb.getCountId()); Dc:DY:L^
ps.executeUpdate();⑴ 5EhE`k4
//ps.addBatch();⑵ BMjfqX
} i:k-"
//int [] counts = ps.executeBatch();⑶ >(tO
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conn.commit(); BvJ=iB<E
}catch(Exception e){ ONWO`XD
e.printStackTrace(); =J.EH|
} finally{ 8t``NZ[
try{ %|?1B$s0
if(ps!=null) { !GN Xt4D
ps.clearParameters(); 1o#vhk/"+
ps.close(); zz3 r<?#5
ps=null; Jk*QcEE=
} Ao*FcrXN
}catch(SQLException e){} A}4t9|/K6
DBUtils.closeConnection(conn); C"No5r'K3
} +!$dO'0nt,
} @zs1>\J7
public long getLast(){ `E;)`J8b
return lastExecuteTime; 2?1}ZXr
} 22IYrk
public void run(){ %MNk4UsV
long now = System.currentTimeMillis(); ~^7
if ((now - lastExecuteTime) > executeSep) { ((9YG
//System.out.print("lastExecuteTime:"+lastExecuteTime); [tN` :}?
//System.out.print(" now:"+now+"\n"); W"O-L
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); }bgo )<i
lastExecuteTime=now; 62NkU)u
executeUpdate(); ;&`:|Hf*
} NEg>lIu<~
else{ IDmsz
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ^je528%H
} 2lJZw@
} &fHc"-U}
}
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 @ay|]w
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类写好了,下面是在JSP中如下调用。 C,='3^Nc
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<% 8q*";>*
CountBean cb=new CountBean(); <|Iyt[s
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); V
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CountCache.add(cb); ,Z4^'1{D
out.print(CountCache.list.size()+"<br>"); C$ hQN
CountControl c=new CountControl(); nr<.YeJ
c.run(); M/)B" q
out.print(CountCache.list.size()+"<br>"); *s36OF!
%>