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: 6hK"k
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CountBean.java hhGpB$A
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/* j!\0Fyr
* CountData.java u2]g1XjeG
* #:|?t&On
* Created on 2007年1月1日, 下午4:44 _vH!0@QFU
* .M2&ad :
* To change this template, choose Tools | Options and locate the template under %Be[DLtE"
* the Source Creation and Management node. Right-click the template and choose SWb5K0YRn
* Open. You can then make changes to the template in the Source Editor. >EtP^Lu~f_
*/ HW726K*
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package com.tot.count; 2H[aY%1T
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/** "ru1 ;I
* (N|xDl&;
* @author &o@5%Rz2/
*/ k+$4?/A
public class CountBean { PAV2w_X~
private String countType; ~iZF~PQ1_
int countId; HDyZzjgG
/** Creates a new instance of CountData */ \STvBI?
public CountBean() {} B5HdC%8/}
public void setCountType(String countTypes){ vXyo
this.countType=countTypes; f+Me dc~
} W;dzLgc
public void setCountId(int countIds){ 2gAdZE&Y
this.countId=countIds; ,jsx]U/^
} Z(mn
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public String getCountType(){ O^weUpe\
return countType; YO$b#
} @ ^cgq3H'
public int getCountId(){ [;?{BB
return countId; )]>
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} b^DV9mO4J
} 8'"/gC{
}#>d2 =T$
CountCache.java n "KJB
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/* Uv`v|S:+2
* CountCache.java jjT2k
* MZW
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* Created on 2007年1月1日, 下午5:01 0C+yq'D~[
* 3dDQz#
* To change this template, choose Tools | Options and locate the template under t0H=NUP8
* the Source Creation and Management node. Right-click the template and choose irb.F>(x
* Open. You can then make changes to the template in the Source Editor. u6I0<i_KZ
*/ :YXQ9/iRr
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package com.tot.count; 2G5!u)
import java.util.*; ku9FN
/** X /,1]
* j_uY8c>3\q
* @author *2
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*/ #'Y6UGJ\n
public class CountCache { LY!3u0PnlT
public static LinkedList list=new LinkedList(); ;
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/** Creates a new instance of CountCache */ T.PZ}4
public CountCache() {} |ezO@
public static void add(CountBean cb){ mRnzP[7-\)
if(cb!=null){ ae#HA[\0G
list.add(cb); Qn)[1v
} 'a/6]%QFd!
} H&=4y) /.
} h9w^7MbO
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CountControl.java ?Gv!d
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/* +6)kX4
* CountThread.java 2j/1@Z1j=
* &Yks,2:P
* Created on 2007年1月1日, 下午4:57 f.84=epv
* xiOrk
* To change this template, choose Tools | Options and locate the template under qMdtJ(gq
* the Source Creation and Management node. Right-click the template and choose xVz -_z
* Open. You can then make changes to the template in the Source Editor. u:H 3.5)%
*/ }V#9tWW
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package com.tot.count; p C2c(4
import tot.db.DBUtils; lyH X#]
import java.sql.*; )tI2?YIR
/** JvWs/AG1
* ^AjYe<RU}
* @author ,-IF++q
*/ ]G
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public class CountControl{ l)rvh#D
private static long lastExecuteTime=0;//上次更新时间 awSS..g}L
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 a0/n13c?G
/** Creates a new instance of CountThread */ 3G/ mB
public CountControl() {} ^%8Hvy
public synchronized void executeUpdate(){ iMeRQYW
Connection conn=null; 9s6>9hMb)
PreparedStatement ps=null; a2=uM}Hsp
try{ K-Dk2(x
conn = DBUtils.getConnection(); sa gBmA~
conn.setAutoCommit(false); s?;<F
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); # pjyhH@
for(int i=0;i<CountCache.list.size();i++){ g9weJ6@}M
CountBean cb=(CountBean)CountCache.list.getFirst(); +yP[(b/
CountCache.list.removeFirst(); 8&A|)ur4
ps.setInt(1, cb.getCountId()); 3| '#n[3
ps.executeUpdate();⑴ JXRf4QmG
//ps.addBatch();⑵ (zw=qbS&
} "G-0i KW;
//int [] counts = ps.executeBatch();⑶ 60~>f)vu
conn.commit(); b^l
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}catch(Exception e){ ]T3BDgu%&
e.printStackTrace(); A]O5+"mc
} finally{ Yx}"> ;\
try{ ?(NT!es
if(ps!=null) { 5IE+M
ps.clearParameters(); uM#U!
ps.close(); J,0WQQnb
ps=null; q%kj[ZOY$]
} HSr"M.k5
}catch(SQLException e){} kSDa\l!W]
DBUtils.closeConnection(conn); hKzBq*cV
} *CPB5s
} xlPcg7
public long getLast(){ K.iH
return lastExecuteTime; Yr"!&\[oz
} .M53, 8X
public void run(){ &b@!DAwAJ
long now = System.currentTimeMillis(); qp~4KukL
if ((now - lastExecuteTime) > executeSep) { Sv~1XL W
//System.out.print("lastExecuteTime:"+lastExecuteTime); 2c>H(t h=
//System.out.print(" now:"+now+"\n"); Xv7U<q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Puth8$
lastExecuteTime=now; gcW{]0%L^
executeUpdate(); .t^UK#@#4
} L4/TI(MP
else{ F3Ak'h{Ay
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); */5<L99v
} fdq^!MWTi
} 6PQJgki
} z5yb$-j
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 ;*g*DIR
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类写好了,下面是在JSP中如下调用。 !AD0-fZ
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<% ) (?UA$"
CountBean cb=new CountBean(); }KaCf,O
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); {Z?$Co^R
CountCache.add(cb); +.gf]|
out.print(CountCache.list.size()+"<br>"); sQ>B_Y!
CountControl c=new CountControl(); b!^M}s6
c.run(); RZ<+AX9R
out.print(CountCache.list.size()+"<br>"); %+7T9>+
%>