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: \'tz|
-01 1U!
CountBean.java @aN=U=
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/* ef:$1VIBda
* CountData.java ]G~N+\8]U
* QYw4kD}
* Created on 2007年1月1日, 下午4:44 >E ;o"
* /M*\t.[ 46
* To change this template, choose Tools | Options and locate the template under 8;f<q u|w
* the Source Creation and Management node. Right-click the template and choose PG[O?l
* Open. You can then make changes to the template in the Source Editor. {)9HS~e T
*/ @<TZH
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package com.tot.count; 6ri?y=-c
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/** }6,bq`MN
* X8n/XG ~_
* @author ^I~T$YjC '
*/ exEld
public class CountBean { (i0"hi
private String countType; ?WtG|w
int countId; zn;Hs]G
/** Creates a new instance of CountData */ $o$Ev@mi
public CountBean() {} Yn]yd1
public void setCountType(String countTypes){ P|P fG=
this.countType=countTypes; Iki+5
} _6S
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public void setCountId(int countIds){ >c\v&k>6.
this.countId=countIds; )F#<)Evw
} CSqb)\8Oi*
public String getCountType(){ q
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return countType; akc"}+-oX
} r,@X>_}
public int getCountId(){ 2G}7R5``9
return countId; eTRx 6Fri(
} <Bb<?7q$ld
} n5*{hi
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CountCache.java <Dj$0g
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/* -1r &s
* CountCache.java ji)4WG/1
* (6#yw`\
* Created on 2007年1月1日, 下午5:01 H0b6ZA%n
* ivUsMhx>S,
* To change this template, choose Tools | Options and locate the template under B6'%J
* the Source Creation and Management node. Right-click the template and choose &Bz7fKCo
* Open. You can then make changes to the template in the Source Editor. V_A,d8=lt
*/ 7}tZ?vD
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package com.tot.count; pg}+lYGP
import java.util.*; .UhBvHH
/** ZDkD%SCy
* ,dj*p,J
* @author CVSsB:H6e
*/ /mBBeg^a
public class CountCache { BXK::M+
public static LinkedList list=new LinkedList(); Ril21o! j
/** Creates a new instance of CountCache */ 'UvS3]bSYW
public CountCache() {} @wdB%
public static void add(CountBean cb){ kGuk
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if(cb!=null){ $sL|'ZMbS
list.add(cb); q>|[JJ*6_N
} ZH$sMh<xg
} ZOrTbik
} @U
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CountControl.java
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/* ]D) 'I`
* CountThread.java m!#)JFe67
* Ad`[Rt']kI
* Created on 2007年1月1日, 下午4:57 B`?N0t%X
* .xLF}{u
* To change this template, choose Tools | Options and locate the template under C=dx4U~
* the Source Creation and Management node. Right-click the template and choose *n*N|6+
* Open. You can then make changes to the template in the Source Editor. C/CfjRzd
*/ #?$'nya*u
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package com.tot.count; ZP63Alt
import tot.db.DBUtils; o,Tr^e$
import java.sql.*; _+Jf.n20
/** EB29vHAt~
* dp[w?AMhM9
* @author B/sBYVU
*/ Id.Z[owC`Y
public class CountControl{ rxy{a
private static long lastExecuteTime=0;//上次更新时间 lR@i`)'?U
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 $nfBvf
/** Creates a new instance of CountThread */ @( n^S?(
public CountControl() {} 16[-3cJ T
public synchronized void executeUpdate(){ SA(U D
Connection conn=null; C7jc 6(>m
PreparedStatement ps=null; 1t\b a1x
try{ Z4HA94
conn = DBUtils.getConnection(); o1#:j?sN
conn.setAutoCommit(false); AJ#m6`M+EK
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); .W@(nQ-<
for(int i=0;i<CountCache.list.size();i++){ $['7vcB^
CountBean cb=(CountBean)CountCache.list.getFirst(); E/dO7I`B
CountCache.list.removeFirst(); g* \P6
ps.setInt(1, cb.getCountId()); Yt/SnF
ps.executeUpdate();⑴ | ,1bkJt
//ps.addBatch();⑵ da00p-U
} }dd k}wga
//int [] counts = ps.executeBatch();⑶ sk7rU+<
conn.commit(); uK;K{
}catch(Exception e){ $@_<$t
e.printStackTrace(); G+hF
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} finally{ Q_QKm0!
try{ >St.c
if(ps!=null) { f
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ps.clearParameters(); s,$Z("B
ps.close(); sw41wj
ps=null; y7M:b Uh
} ?y>Y$-v/C
}catch(SQLException e){} `\/toddUh[
DBUtils.closeConnection(conn); Y(hW(bd;
} Vedyy\TU
} $*AC>i\
public long getLast(){ ol$2sI=.s
return lastExecuteTime; >&<<8Ln
} p| \%:#
public void run(){ {*?sVAvj
long now = System.currentTimeMillis(); @q> ktE_
if ((now - lastExecuteTime) > executeSep) { V\@jC\-5Vt
//System.out.print("lastExecuteTime:"+lastExecuteTime); <DeKs?v
//System.out.print(" now:"+now+"\n"); Ue{vg$5||
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 2/yXY_L
lastExecuteTime=now; e$Xq
executeUpdate(); C5PmLiOHY>
} S]e j=6SP
else{ d)04;[=
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); fjIcB+Z
} Cdp]Nv6
} 4?>18%7&
} I!$jYY2
//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 Ic[}V0dk
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类写好了,下面是在JSP中如下调用。 pKt-R07*
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<% fJ)N:q`
CountBean cb=new CountBean(); fg9?3x
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cb.setCountId(Integer.parseInt(request.getParameter("cid")));
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CountCache.add(cb); Lh8bQH
out.print(CountCache.list.size()+"<br>"); =zeFK_S!
CountControl c=new CountControl(); %6NO 0 F^
c.run(); F>~ xzc
out.print(CountCache.list.size()+"<br>"); <`R|a *
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