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: ^6R?UG;6
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CountBean.java &5:83#*Oj
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/* y/57 >.3
* CountData.java I;xrw?=\L
* c\cPmj@
* Created on 2007年1月1日, 下午4:44 IzPnbnS}
* qyzmjV6J2
* To change this template, choose Tools | Options and locate the template under ~R-P%l P
* the Source Creation and Management node. Right-click the template and choose H/"$#8-/
* Open. You can then make changes to the template in the Source Editor. Q-<N)K$F(4
*/ ayR=GqZ1
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package com.tot.count; SPfz/ q{
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/** C;]}Ht:~I
* lezX-5Z
* @author 7]se!k,
*/ r'!L}^n
public class CountBean { \
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private String countType; m,YBk<Bx
int countId; g{{DC )>
/** Creates a new instance of CountData */ a=n*}.
public CountBean() {} aQzDOeTi
public void setCountType(String countTypes){ /BEE.`6yI5
this.countType=countTypes; ZBYFQTEE
} `5da
public void setCountId(int countIds){ <r 2$k"*:
this.countId=countIds; !R@v\Eu
} (55k70>i3
public String getCountType(){ WbF[4x
return countType; 6! `^}4
} #Bu W
public int getCountId(){ Egy#_ RT{
return countId; .d
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} o@T-kAEf-.
} xZbiEDU
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CountCache.java YU>NGC]}d
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/* 9BW"^$
* CountCache.java PydU.,^7
* ]J|]IPXy
* Created on 2007年1月1日, 下午5:01 G,o5JL"t
* z)AZ:^!O
* To change this template, choose Tools | Options and locate the template under LC8&},iu
* the Source Creation and Management node. Right-click the template and choose \N3A2L)l
* Open. You can then make changes to the template in the Source Editor. \PU7,*2
*/ Q`= ,&;T>
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package com.tot.count; :c03"jvYE
import java.util.*; (rTn6[*
/** lqaOLZH
* N{kp^Byim0
* @author jimWLF5Q5"
*/ 6l Suzu
public class CountCache { Rda~Drz
public static LinkedList list=new LinkedList(); y}5:CZ
/** Creates a new instance of CountCache */ Twq/Y07M
public CountCache() {} -!Ov{GHr0
public static void add(CountBean cb){ /O`<?aP%
if(cb!=null){ MgpjC`
list.add(cb); $c^,TAN
} 3.0t 5F<B
} pUV4oyGV
} fX:=_c
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CountControl.java kH4xP3. i
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/* *WzvPl$e
* CountThread.java @O]v.<8
* I
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* Created on 2007年1月1日, 下午4:57 8%\0v?a5
* Q}zd!*
* To change this template, choose Tools | Options and locate the template under 1@}s:
* the Source Creation and Management node. Right-click the template and choose *'l|ws
* Open. You can then make changes to the template in the Source Editor. f3;.+hJ])
*/ bz'#YM
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package com.tot.count; Z@1vJH6IbA
import tot.db.DBUtils; PS:"mP7n
import java.sql.*; ",,W1]"%
/** Q0j4c
* ,#V}qSKUS
* @author {e]ktj#+{
*/ @sPuc.
public class CountControl{ %M7EOa
private static long lastExecuteTime=0;//上次更新时间 U*Sjb%
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 r)]8zK4;=
/** Creates a new instance of CountThread */ bI?uV;m>
public CountControl() {} |~]@hs~
public synchronized void executeUpdate(){ jA'7@/F/
Connection conn=null; tX.fbL@T
PreparedStatement ps=null; ]@P!Q&V #
try{ l$:?82{
conn = DBUtils.getConnection(); qmy3pnL
conn.setAutoCommit(false); 4Pv Pp{Y
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?");
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for(int i=0;i<CountCache.list.size();i++){ bnzIDsw!Q
CountBean cb=(CountBean)CountCache.list.getFirst(); E7`Q=4@e
CountCache.list.removeFirst(); KAI/*G\z
ps.setInt(1, cb.getCountId()); @h
E7F}
ps.executeUpdate();⑴ wg}rMJoG|
//ps.addBatch();⑵ 4
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} wAA9M4
//int [] counts = ps.executeBatch();⑶ is6M{K3
conn.commit(); ;
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}catch(Exception e){ Oj]4jRew
e.printStackTrace(); ~ TfN*0
} finally{ :k/Z|
try{ sZh| <2
if(ps!=null) { lHI?GiB@
ps.clearParameters(); Y'U]!c9
ps.close();
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ps=null; E``\Jre@
} ir<K"wi(2
}catch(SQLException e){} Qz4n%|
DBUtils.closeConnection(conn); {oVoN>gp
} @Wl2E.)K;
} =N^j:t
public long getLast(){ U
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return lastExecuteTime; f?BApm
} [AN= G!r
public void run(){ qA>C<NL
long now = System.currentTimeMillis(); ?'/#Gt`
if ((now - lastExecuteTime) > executeSep) { c`s ]ciC
//System.out.print("lastExecuteTime:"+lastExecuteTime); (yO8G-Z0
//System.out.print(" now:"+now+"\n"); 'z$!9ufY,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Aa!#=V1d
lastExecuteTime=now; .T*89cEu
executeUpdate(); j21>\K!p
} a0)] W%F
else{ LB\+*P6QM
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ;=lQMKx0
} @!KG;d:l
} UZ-[vD1n
} neBcS[
//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 qBF}-N_
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类写好了,下面是在JSP中如下调用。 VK[`e[.C
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<% YF$nL(
CountBean cb=new CountBean(); zL=PxFw0
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); |y DaFv
CountCache.add(cb); ]&_z@Z.i
out.print(CountCache.list.size()+"<br>"); '9tV-whw
CountControl c=new CountControl(); Lgrpy
c.run(); b~Un=-@5a
out.print(CountCache.list.size()+"<br>"); &'"dYZj{
%>