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: }IO<Dq=[
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CountBean.java BZejqDr*
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/* M #'br<]
* CountData.java (DJLq
* Yv k
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* Created on 2007年1月1日, 下午4:44 F1) B-wW
* >}Qj|05G
* To change this template, choose Tools | Options and locate the template under $&~/`MxE
* the Source Creation and Management node. Right-click the template and choose oFM\L^Y?$$
* Open. You can then make changes to the template in the Source Editor. =y-L'z&r
*/ ,Tc3koi
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package com.tot.count; xFxl9oM."
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/** kR$>G2$!
* nv&uhu/q
* @author Ck;O59A"&-
*/ ie|I*;#
public class CountBean { )OQhtxK
private String countType; H,,-;tN?
int countId; |T?wM/
/** Creates a new instance of CountData */ e~R;
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public CountBean() {} u>c\J|K_V
public void setCountType(String countTypes){ AQn>K{M
this.countType=countTypes; 0q'd }D W
} w1HE^
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public void setCountId(int countIds){ \{r-e
this.countId=countIds; y_O [r1MF
} _svEPHU
public String getCountType(){ $jT&]p
return countType; hY
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} :#D?b.=
public int getCountId(){ F*V<L
return countId; Yhdt"@;..
} 79 zFF
} 5`qt82Qm
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CountCache.java z ogtIn)
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/* d"3S[_U
* CountCache.java k.bzh.
* s ^NO(
* Created on 2007年1月1日, 下午5:01 |GuIp8~
* is=sV:j:
* To change this template, choose Tools | Options and locate the template under &8'.Gwm}
* the Source Creation and Management node. Right-click the template and choose 5
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* Open. You can then make changes to the template in the Source Editor. D|8vS8p
*/ JQ{g'cT
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package com.tot.count; R=M"g|U6
import java.util.*; _;mN1Te
/** &`>[4D*
* {FzL@!||
* @author y*2R#jTA
*/ OJd!g/V
public class CountCache { Zgp]s+%E
public static LinkedList list=new LinkedList(); ""Ul6hRgv
/** Creates a new instance of CountCache */ xe^*\6Y
public CountCache() {} 1-Fg_G}|6
public static void add(CountBean cb){ nb(4"|8}
if(cb!=null){ b?Wg|D
list.add(cb); WelB+P2
} 8@%Xd^
} R'a%_sACj>
} vQrce&
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CountControl.java :T~Aa(%(
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/* gyH'92ck
* CountThread.java YArNJ5z=
* G yZYP\'S+
* Created on 2007年1月1日, 下午4:57 s
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* 'Z2:u!E
* To change this template, choose Tools | Options and locate the template under F\1nc"K/(
* the Source Creation and Management node. Right-click the template and choose ~ZU;0#
* Open. You can then make changes to the template in the Source Editor. 7t-j2 n`<
*/ &{QB}r
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package com.tot.count; zM6yUEg
import tot.db.DBUtils; N/)mw/?i
import java.sql.*; 8D]:>[|E
/** *Yv"lB8
* 4mOw[}@A
* @author /=Ug}%.
*/ $w%oLI@kl
public class CountControl{ mY-Z$8r
private static long lastExecuteTime=0;//上次更新时间 ;ak3@Uee
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 1wUZ0r1'
/** Creates a new instance of CountThread */ hZnT`!iFE^
public CountControl() {} 6QdNGpN
public synchronized void executeUpdate(){ aKs!*uo0H
Connection conn=null; %sC,;^wla'
PreparedStatement ps=null; d$ Mk
try{ z.16%@R
conn = DBUtils.getConnection(); kF'^!Hp
conn.setAutoCommit(false); R#~}ZUk2
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); pH#&B_S6z=
for(int i=0;i<CountCache.list.size();i++){ k/l@P
CountBean cb=(CountBean)CountCache.list.getFirst(); 6A M,1
CountCache.list.removeFirst(); ?97MW a
ps.setInt(1, cb.getCountId()); ^7q=E@[e
ps.executeUpdate();⑴ x6HebIR+
//ps.addBatch();⑵ DHpU?;|3
} h7Jo_L7
//int [] counts = ps.executeBatch();⑶ [e)81yZG>
conn.commit(); :{4G=UbAI
}catch(Exception e){ qt]QO1pAd
e.printStackTrace(); IZ')1
} finally{ 3sGrX"0D
try{ 9BI5qHEp
if(ps!=null) { E E?v~6"&
ps.clearParameters(); cYx=8~-
ps.close(); *p?b "{_a
ps=null; ;TSnIC)c
} `Q26Dk
}catch(SQLException e){} =\4w" /Y
DBUtils.closeConnection(conn); w%S<N
} +lJuF/sS8m
} d!8q+FI
public long getLast(){ |L;'In
return lastExecuteTime; =)M 8>>l
} &Wd,l$P<O
public void run(){ xHsH .f_{
long now = System.currentTimeMillis(); mk\U wv
if ((now - lastExecuteTime) > executeSep) { ^S ,E "Q
//System.out.print("lastExecuteTime:"+lastExecuteTime); N["c*=x
//System.out.print(" now:"+now+"\n"); 7P/j\frW
// System.out.print(" sep="+(now - lastExecuteTime)+"\n");
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