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: ZO,]h9?4
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CountBean.java L\UYt\ks
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/* lxeolDl
* CountData.java t?s1@}G^
* <MYD`,$yu
* Created on 2007年1月1日, 下午4:44 hE;
* pJmn;XbME
* To change this template, choose Tools | Options and locate the template under !@Ox%vK
* the Source Creation and Management node. Right-click the template and choose T|u)5ww%
* Open. You can then make changes to the template in the Source Editor. {0|^F!1z
*/ 1@am'#<
~HELMS~-
package com.tot.count; m4EkL
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/** B>R6j}rh'k
* uW]n3)7<I
* @author a^22H
*/ -6?5|\
public class CountBean { b@7
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private String countType; o,29C7Ii
int countId; h:|aQJG5
/** Creates a new instance of CountData */ nPKj%g3h
public CountBean() {} "m!Cl-+u
public void setCountType(String countTypes){ z:w7e0
this.countType=countTypes; "Kqe4$
} Nz m
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public void setCountId(int countIds){ mGIS[_dcs
this.countId=countIds; PKP(:3|
} xd*kNY
public String getCountType(){ X0m\
return countType; EprgLZ1B
} $+tkBM
public int getCountId(){ H)5]K9D
return countId; )T^hyi$
} `8L7pbS%,Q
} O @l `D`
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CountCache.java pvX\kX3}
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/* )msqt!Ev
* CountCache.java :5ji.g* 0
* r!;NH3 *
* Created on 2007年1月1日, 下午5:01 x{=ty*E
* +;vfn>^!b
* To change this template, choose Tools | Options and locate the template under n04Zji(F@
* the Source Creation and Management node. Right-click the template and choose 7y:J@fh<
* Open. You can then make changes to the template in the Source Editor. 5[0n'uH
*/ _ W$4Qn+f
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package com.tot.count; 4h-y'&Z
import java.util.*; ]g:VvTJ;?
/** -gzk,ymp
* mX
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* @author n#4Ra+dD
*/ +~7@K{6q-
public class CountCache { _KKG^
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public static LinkedList list=new LinkedList(); y0Ag px
/** Creates a new instance of CountCache */ K(hqDif*6
public CountCache() {} R#oXQaBJ
public static void add(CountBean cb){ 8NpQ"0X
if(cb!=null){ P!:D2zSH_
list.add(cb); =>4,/g3
} 'peFT[1>(
} 5)0R:
} >I+O@
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CountControl.java 3^8%/5$v
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/* .Zo8KwkFY
* CountThread.java cd\0
* ibEQ5 2
* Created on 2007年1月1日, 下午4:57 q")}vN
* ^"l4
* To change this template, choose Tools | Options and locate the template under I"r*p?
* the Source Creation and Management node. Right-click the template and choose HJwj,SL
* Open. You can then make changes to the template in the Source Editor. |ONkRxr@!
*/ &ceZu=*
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package com.tot.count; h" j{B
import tot.db.DBUtils; A07FjT5w8
import java.sql.*; 9"&HxyOfX
/** )abo5
* f.Jz]WXw,
* @author wF}/7b54
*/ y;uk|#qnPS
public class CountControl{ JWC{ "6
private static long lastExecuteTime=0;//上次更新时间 !YCYmxw#
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +[:}<^p?cG
/** Creates a new instance of CountThread */ ZVViu4]?y
public CountControl() {} ^*RmT
public synchronized void executeUpdate(){ 7u0!Q\
Connection conn=null; evq*&.6\
PreparedStatement ps=null; {=pf#E=
try{ {~ VgXkjsC
conn = DBUtils.getConnection(); Drc\$<9c@
conn.setAutoCommit(false); iYR8sg[' #
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); '\P6NszY~
for(int i=0;i<CountCache.list.size();i++){ VDBP]LRF
CountBean cb=(CountBean)CountCache.list.getFirst(); 8MV=?
CountCache.list.removeFirst(); 'xhX\?mD
ps.setInt(1, cb.getCountId()); a>6!?:Rj
ps.executeUpdate();⑴ *SLv$A
//ps.addBatch();⑵ FSC74N/
} s@Y0"
//int [] counts = ps.executeBatch();⑶ Q@nxGm
conn.commit(); 1jO/"d.8n
}catch(Exception e){ Za5*HCo
e.printStackTrace(); 7\<#z|
} finally{ c)+IX;q-C
try{ 0Kq\ oMn
if(ps!=null) { T-uI CMEf
ps.clearParameters(); MYDAS-
ps.close(); M{1't
ps=null; :(N3s9:vz
} x%5n& B
}catch(SQLException e){} aOETms w
DBUtils.closeConnection(conn); mKfT4t
} u+kXJ
} a8Nl'
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public long getLast(){ >}Za)
return lastExecuteTime; y.HE3tH
} BNnGtVAbZ
public void run(){ R=xT \i{4h
long now = System.currentTimeMillis(); vA*!82
if ((now - lastExecuteTime) > executeSep) { fU8 &fo%ER
//System.out.print("lastExecuteTime:"+lastExecuteTime); skf7Si0z
//System.out.print(" now:"+now+"\n"); &dH/V-te
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); y>UM~E
lastExecuteTime=now; <T,vIXwu+
executeUpdate(); kO+Y5z6=
} YOqGFi~`
else{ [g`P(?
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); !SMIb(~[z
} 4,`Yx s)%
} XnV*MWv
} k7'_
//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 "l"zbW WOH
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类写好了,下面是在JSP中如下调用。 ?Bno?\
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<% :dc>\kUIv
CountBean cb=new CountBean(); #"|</*%>
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); <}&n}|!
CountCache.add(cb); IXDj;~GF
out.print(CountCache.list.size()+"<br>"); P{h;2b{
CountControl c=new CountControl(); Mpzt9*7R
c.run(); qk<(iVUO
out.print(CountCache.list.size()+"<br>"); kFg@|#0v9
%>