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: 59K}
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CountBean.java a G@nErdW
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/* l-MxLcz
* CountData.java 'FqEB]gu
* 1 M=
* Created on 2007年1月1日, 下午4:44 iW;}%$lVX
* dWjx"7^
* To change this template, choose Tools | Options and locate the template under /+N|X
* the Source Creation and Management node. Right-click the template and choose ~r PYJ
* Open. You can then make changes to the template in the Source Editor. lJlZHO
*/ drs-mt8
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package com.tot.count; !+=Zjm4L
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/** j;G[%gi6{
* L2d:.&5
* @author @$EjD3Z-
*/ 99a\MH`^
public class CountBean { DQMPAj.
private String countType; O%prD}x
int countId; NA=#>f+U%
/** Creates a new instance of CountData */ 7Zo&+
public CountBean() {} PE|PwqX
public void setCountType(String countTypes){ =g >.X9lr
this.countType=countTypes; Pu-p7:99;'
} ]L$4Py
public void setCountId(int countIds){ Hw y5G;
this.countId=countIds; CJm.K
} prwC>LE
public String getCountType(){ keaj3#O
return countType; ia_Z\q
} TbMdQbj}
public int getCountId(){ .hc|t-7f
return countId; ?Q;kZmQl
} f.J9) lfb
} pFEZDf}:
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CountCache.java ' *}^@[&
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/* gA{'Q\
* CountCache.java ka!Bmv)
* C`3V=BB
* Created on 2007年1月1日, 下午5:01 mF}c-
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* %V31B\]Nz7
* To change this template, choose Tools | Options and locate the template under r?>V x-
* the Source Creation and Management node. Right-click the template and choose Ut]2` 8-
* Open. You can then make changes to the template in the Source Editor. 6zv;lx0<D&
*/ G l_\Vy
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package com.tot.count; F OeVRq:#
import java.util.*; "Wo.8
/** oHOW5
* Q!YF!WoBX
* @author IF5sqv
*/ \QliHm!
public class CountCache { El'yiJ
public static LinkedList list=new LinkedList(); 75kKDR}6
/** Creates a new instance of CountCache */ xrfPZBLy
public CountCache() {} h4tC. i~k
public static void add(CountBean cb){ r|*:9|y{"/
if(cb!=null){ R$Zv0a&
list.add(cb); 5/tj
} /731.l
} @+iC/
} 4 #aqz9k
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CountControl.java Ica3
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/* xIM8
* CountThread.java =Na/3\^WP
* qx Wgt(Os
* Created on 2007年1月1日, 下午4:57 IY V-*/
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* $4DFgvy$
* To change this template, choose Tools | Options and locate the template under Vu_&~z7h
* the Source Creation and Management node. Right-click the template and choose Z"-ntx#
* Open. You can then make changes to the template in the Source Editor. "|F.'qZrm
*/ xy$vYDAFw
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package com.tot.count; ,wEM
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import tot.db.DBUtils; Tku/OG'
import java.sql.*; /.7$`d
/** ,c@r`
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* @author Lwp-2`%
*/ aZ I>x^X
public class CountControl{ #!w:_T%
private static long lastExecuteTime=0;//上次更新时间 KLG6QBkj
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 4sj9Z:
/** Creates a new instance of CountThread */ +Y^-e.UO
public CountControl() {} ~^^!"-
public synchronized void executeUpdate(){ Rl y jOf{0
Connection conn=null; hK:#+hg,
PreparedStatement ps=null; 4\&H?:c.
try{ 6 lN?) <uQ
conn = DBUtils.getConnection(); 8rGl&
conn.setAutoCommit(false); axWM|Bw<+
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); mG>T`c|r3
for(int i=0;i<CountCache.list.size();i++){ o,g6JTh
CountBean cb=(CountBean)CountCache.list.getFirst(); issT{&T
CountCache.list.removeFirst(); -"2 <h:#
ps.setInt(1, cb.getCountId()); v;K{|zUdB
ps.executeUpdate();⑴ RcY6V_Qx
//ps.addBatch();⑵ se~ *<5
} :|?~B%-p[
//int [] counts = ps.executeBatch();⑶ 5OPS&:
conn.commit(); ?+bTPl;%'
}catch(Exception e){ Tf9&,!>V
e.printStackTrace(); *d^9,GGn-
} finally{ WA<H
try{ mw:3q6
if(ps!=null) { )W[KD,0+j
ps.clearParameters(); QV`X?m
ps.close(); OI'uH$y
ps=null; u86J.K1Q
}
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}catch(SQLException e){} 6>@(/mh*
DBUtils.closeConnection(conn); J% :WLQo
} bk/.<Rt
} +<'uw
public long getLast(){ NFdJb\
return lastExecuteTime; &z ./4X
} z2rQ$O-#
public void run(){ "
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long now = System.currentTimeMillis(); 1i5 vW- '4
if ((now - lastExecuteTime) > executeSep) { D
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//System.out.print("lastExecuteTime:"+lastExecuteTime); 5Z^$`$/.v#
//System.out.print(" now:"+now+"\n"); 6&g!ZE'G
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 38"8,k
lastExecuteTime=now; O{;M6U8C\
executeUpdate(); RA*_&Ll&!C
} M3hy5j(b
else{ 0|WOReskK
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); 7yY1dR<Y
} ({*.!ty
} vS~AxeW/7R
} F7k4C2r
//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 C\;;9
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类写好了,下面是在JSP中如下调用。 ?9o#%?6k
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<% $ka1X&f
CountBean cb=new CountBean(); +W V@o'
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Iu=pk@*O
CountCache.add(cb); -=-x>(pRW7
out.print(CountCache.list.size()+"<br>"); Jm{As*W>
CountControl c=new CountControl(); I T*fjUY&
c.run(); S#dyRTmI
out.print(CountCache.list.size()+"<br>"); ,
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