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: ;<[X\;|'
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CountBean.java H iyg1
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/* L, JQ\!c
* CountData.java J:xGEa t
* Cp8=8N(Xb
* Created on 2007年1月1日, 下午4:44 Lc3&\q
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* (WM3(US|
* To change this template, choose Tools | Options and locate the template under }E'0vf/
* the Source Creation and Management node. Right-click the template and choose 1F@k9[d~
* Open. You can then make changes to the template in the Source Editor. +P/kfY"
*/ $v^hzC
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package com.tot.count; I6>J.6luF9
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/** wQ}r/2n|^
* 0> f!S` *
* @author E5k)~P`|
*/ [a=exK
public class CountBean { | f#wbw
private String countType; q7R]!zk
int countId; Q;M\fBQO}&
/** Creates a new instance of CountData */ /jbAf ]"F;
public CountBean() {} ys[Li.s:
public void setCountType(String countTypes){ sX>u.
this.countType=countTypes; e#"h@kZP
} YOCEEh?
public void setCountId(int countIds){ |VfEp
this.countId=countIds; 9&6j uL
} 9t`;~)o
public String getCountType(){ hHs/Qtq
return countType; 5> k:PKHL
} 6{Wo5O{!\
public int getCountId(){ h Yu6PWK
return countId; iD^,O)b
} q
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} 3jmo[<p*x
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CountCache.java c-Lz luWi
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/* %#6@PQ[R.
* CountCache.java "wUIsuG/p
* (In{GA7;
* Created on 2007年1月1日, 下午5:01 _O9V"DM
* v.0qE}'
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* To change this template, choose Tools | Options and locate the template under }gp@0ri%5
* the Source Creation and Management node. Right-click the template and choose N0`9/lr|
* Open. You can then make changes to the template in the Source Editor. ,
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*/ 2q
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package com.tot.count; 'Zx5+rM${}
import java.util.*; _e%D/}
/** XLh)$rZ
* b)wcGBS
* @author FD=%
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*/ c*USA
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public class CountCache { n<?U6~F&~
public static LinkedList list=new LinkedList(); JsEJ6!1
/** Creates a new instance of CountCache */ Qg> NJ\*Q
public CountCache() {} rd <m:r
public static void add(CountBean cb){ STKL
if(cb!=null){ 2TK \pfD
list.add(cb); uvys>]+
} iP:i6U]
} |vI*S5kn6A
} KE?t?p
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CountControl.java $8EEtr,!
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/* -I< >Ab
* CountThread.java Vk5Z[w a
* kVnRSg}R
* Created on 2007年1月1日, 下午4:57 X>(1fra4
* '
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* To change this template, choose Tools | Options and locate the template under MK<
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* the Source Creation and Management node. Right-click the template and choose ('J/Ww<
* Open. You can then make changes to the template in the Source Editor. WMbkKC.{J
*/ /:|vJ|dJ
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package com.tot.count; awLvLkQb{
import tot.db.DBUtils; a ~o<>H
import java.sql.*; I&PJ[U#~a
/** [8V;Q
*
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* @author T,38Pu@r
*/ -t-f&`S||
public class CountControl{ 6 2xOh\(
private static long lastExecuteTime=0;//上次更新时间 `sjY#Ua<
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 I8#2+$Be+@
/** Creates a new instance of CountThread */ e=amh
public CountControl() {} ns[/M~_r
public synchronized void executeUpdate(){ 5eAZfe%H
Connection conn=null; UmKE]1Yw4r
PreparedStatement ps=null; SmXJQ@jN
try{ 7?lz$.*Avp
conn = DBUtils.getConnection(); U~G7~L &m
conn.setAutoCommit(false); }U]jy
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {i;,Io7W
for(int i=0;i<CountCache.list.size();i++){ 5"%.8P
CountBean cb=(CountBean)CountCache.list.getFirst(); q<RjAi
CountCache.list.removeFirst(); 5(;Y&?k
ps.setInt(1, cb.getCountId()); Ou[K7-m%&
ps.executeUpdate();⑴ p.8 bX
//ps.addBatch();⑵ 79DNNj~
} B4s$| i{D
//int [] counts = ps.executeBatch();⑶ n,T
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conn.commit(); !$)reaS
}catch(Exception e){ HZrA}|:h
e.printStackTrace(); )@]%:m!ER
} finally{ 7w
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try{ KQ~y;{h?b
if(ps!=null) { l5z//E}W
ps.clearParameters(); =4TQ*;V:
ps.close(); hY}Q|-|
ps=null; A;cA|`b
} kD#T_d
}catch(SQLException e){} VoCg,gow
DBUtils.closeConnection(conn); ^sv|m"
} &X4anH>O
} b42%^E
public long getLast(){ ;@+|]I
return lastExecuteTime; vNi;)"&*
} #.8v[TkKq
public void run(){ lKbWQ>
long now = System.currentTimeMillis(); fECV\Z
if ((now - lastExecuteTime) > executeSep) { j26i+Z
//System.out.print("lastExecuteTime:"+lastExecuteTime); +!).'
//System.out.print(" now:"+now+"\n"); rfV'EjiM}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); (Y py}
lastExecuteTime=now; jUT`V
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executeUpdate(); py6<QoGV
} a)|y0w)vV
else{ L:
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); ?mMM{{%(.
} _\AQJ?<M
} We6eAP /Z
} ED0cnr\yG
//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 S5>s&
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类写好了,下面是在JSP中如下调用。 <4{m99
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<% @$slGY
CountBean cb=new CountBean(); ^y,h0?Z9
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); aEf3hB* ~
CountCache.add(cb); TX)W.2u=
out.print(CountCache.list.size()+"<br>"); dv+Gv7&2/
CountControl c=new CountControl();
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c.run(); c[2t,+O
out.print(CountCache.list.size()+"<br>"); 3ynkf77cn
%>