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: }bjZeh.
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CountBean.java 7R2O[=Szq
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/* +JU, ^A#X
* CountData.java i
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* tUJRNEg
* Created on 2007年1月1日, 下午4:44 !SQcV'
* G:1'}RC :
* To change this template, choose Tools | Options and locate the template under mUh]`/MK$
* the Source Creation and Management node. Right-click the template and choose Mn.,?IF`K
* Open. You can then make changes to the template in the Source Editor. (hzN(Dh
*/ ump~)?_B
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package com.tot.count; @yaFN>w
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/** (8JU!lin
* 5G*cAlU
* @author } p'ZMj&
*/ ;hX( /T
public class CountBean { vjGQ! xF
private String countType; $E\|\g
int countId; d!y*z
/** Creates a new instance of CountData */ <=q}
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public CountBean() {} ' [
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public void setCountType(String countTypes){ G21o@38e
this.countType=countTypes; yp.K-
} z*eBjHbF
public void setCountId(int countIds){ smQ^(S^
this.countId=countIds; 2@D`^]]
} do}LaUz
public String getCountType(){ jmM|on!
return countType; 6Dq4Q|C
} #.bW9j/
public int getCountId(){ $"^K~5Q
return countId; 86r5!@WN
} u*l|MIi6J
} L_8zZ8 o
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CountCache.java k"(]V
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/* xAQtX=FoX+
* CountCache.java C9n%!()>
* .V?:&_}_I6
* Created on 2007年1月1日, 下午5:01 W(s4R,j
* QU|_
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* To change this template, choose Tools | Options and locate the template under 9 E!le=>
* the Source Creation and Management node. Right-click the template and choose Sjpx G@k
* Open. You can then make changes to the template in the Source Editor. kXMp()N8`
*/ G'ykcB._
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package com.tot.count; ?{{w[U6NE
import java.util.*; _IYaMo.n
/** %BqaVOKJ"f
* k9^Hmhjw
* @author 0s#72}n
*/ ^OR0Vp>L
public class CountCache { N@q}eGe
public static LinkedList list=new LinkedList(); }SN( ^3N
/** Creates a new instance of CountCache */ sHP-@
public CountCache() {} J!6FlcsZm
public static void add(CountBean cb){ RLB3 -=9t
if(cb!=null){ *T|B'80
list.add(cb); gE-y`2SU
} l4Xz r:]
} {meX2Z4
} nM
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CountControl.java *eVq(R9?T
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/* tZrc4$D-
* CountThread.java kNEEu!G
* Lsmcj{1d
* Created on 2007年1月1日, 下午4:57 ^PksXfk
* J3K=z
* To change this template, choose Tools | Options and locate the template under 7|P
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* the Source Creation and Management node. Right-click the template and choose U@lc1#
* Open. You can then make changes to the template in the Source Editor. NR{wq|"
*/ &1xCPKIr
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package com.tot.count; 9(CvGzco<
import tot.db.DBUtils; |y\Km
import java.sql.*; (!os&/",
/** lq/2Y4LE)
* 5Wt){rG0Z
* @author 5gszAvOO
*/ Ac7^JXh%
public class CountControl{ kX 1}/l
private static long lastExecuteTime=0;//上次更新时间 IUcL*
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 NWBYpGZx
/** Creates a new instance of CountThread */ GXNf@&
public CountControl() {} [|u^:&az
public synchronized void executeUpdate(){ 8sG3<$Z^
Connection conn=null; $Gn.G_"v
PreparedStatement ps=null; e%4?-{(
try{ 29R-Up!SVN
conn = DBUtils.getConnection(); WL$^B@gXQ
conn.setAutoCommit(false); INZVe(z
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); yqK4 "F&
for(int i=0;i<CountCache.list.size();i++){ qfkHGW?1/j
CountBean cb=(CountBean)CountCache.list.getFirst(); |.IH4
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CountCache.list.removeFirst(); ^S9y7b^;r
ps.setInt(1, cb.getCountId()); E-MPFL
ps.executeUpdate();⑴ +jN}d=N-
//ps.addBatch();⑵ !XA3G`}p6s
} 7p&jSOY
//int [] counts = ps.executeBatch();⑶ "(koR Q
conn.commit(); Gn]36~)*H
}catch(Exception e){ .p`4>XA
e.printStackTrace(); g8),$:Uw
} finally{ adON&<
try{ bQll;U^A
if(ps!=null) { ?Cq7_rq
ps.clearParameters(); ntiS7g e1
ps.close(); ZO}Og&%
ps=null; #m+!<
} 3:%k
pnO
}catch(SQLException e){} j jpYg
DBUtils.closeConnection(conn); *OVB;]D3+
} '[F:uA
} +)Te)^&v%
public long getLast(){ Z5{a7U4z_
return lastExecuteTime; &dtk&P{
} Ycm)PU ["
public void run(){ R+sT
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long now = System.currentTimeMillis(); @nxo Bc !P
if ((now - lastExecuteTime) > executeSep) { #u<Qc T@
//System.out.print("lastExecuteTime:"+lastExecuteTime); MatXhP] Fi
//System.out.print(" now:"+now+"\n"); (iIw}f)w
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); &{iC:zp
lastExecuteTime=now; 3KLUH=)P
executeUpdate(); z*Sm5i&)_q
} 0QQss
else{ Zw]`z*,yRA
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); yu?5t?vf
} XGlt^<`
} F c[KIG3@
} $o"nTl
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 k<1yv$/mW
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类写好了,下面是在JSP中如下调用。 BT_]=\zi
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<% Ku;fZN[g
CountBean cb=new CountBean(); ^-;S&=
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); KuNLu31%
CountCache.add(cb); WSThhI
out.print(CountCache.list.size()+"<br>"); +,Dc0VC?
CountControl c=new CountControl(); G#iQX`
c.run(); A#uU]S
out.print(CountCache.list.size()+"<br>"); WlL(NrVA@@
%>