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: z
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CountBean.java ; iia?f1
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/* =gQ9>An
* CountData.java &LAXNk2
* =8?Kn@nMN
* Created on 2007年1月1日, 下午4:44 9K`_P] l2z
* 0Z6geBMc
* To change this template, choose Tools | Options and locate the template under (VjU ,'h
* the Source Creation and Management node. Right-click the template and choose `2@.%s1o=
* Open. You can then make changes to the template in the Source Editor. w90YlWS#
*/ J>}J~[ap\J
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package com.tot.count; ,oA<xP-*
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/** pCh v;
* Wvr{l
* @author s b;q)Rh
*/ ?![[la+f
public class CountBean { 0Z8"f_GK
private String countType; E(PBV
int countId; 8\lh'8
/** Creates a new instance of CountData */ ciS,
public CountBean() {} =zyA~}M2
public void setCountType(String countTypes){ BtC*]WB"_'
this.countType=countTypes; 'q)g,2B%
} V3t#kv
public void setCountId(int countIds){ <ErX<(0`ig
this.countId=countIds; )|lxzlk
} *$<W"@%^J
public String getCountType(){ [^5;XD:%&l
return countType; @9B*V~ <
} \CMZ_%~wU
public int getCountId(){ A<X?1$
return countId; )?$[iu7 s
} D:_W;b)
} Q# B0JT1
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CountCache.java ;Y^'$I2fR#
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/* O1z]d3x
* CountCache.java 'f-r 6'_ZX
* 06S
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* Created on 2007年1月1日, 下午5:01 ~Ba=nn8Cq
* W}CM;~*L
* To change this template, choose Tools | Options and locate the template under uX6yhaOp|
* the Source Creation and Management node. Right-click the template and choose LTTMa-]Yy
* Open. You can then make changes to the template in the Source Editor. fgdR:@]-
*/ wu)+n\mt'
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package com.tot.count;
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import java.util.*; v4n< G-
/** Vb(b3
* (.ir"\k1(
* @author Db,"Gl
*/ -^xbd_'
public class CountCache { @x}"aJgl
public static LinkedList list=new LinkedList(); kyJbV[o<#
/** Creates a new instance of CountCache */ "Wwu Ty|
public CountCache() {} p%3z*2,(
public static void add(CountBean cb){ At iUTA
if(cb!=null){ .$18%jH#
list.add(cb); SeD}H=,@
} G](4!G&
} G#n 4g:K
} W,<q!<z\t
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CountControl.java t}YcB`q)
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/* ]4l2jY
* CountThread.java UTD_rQ
* hIJtu;}zU
* Created on 2007年1月1日, 下午4:57 }5;4'l8
* *q=T1JY
* To change this template, choose Tools | Options and locate the template under GJeG7xtJKl
* the Source Creation and Management node. Right-click the template and choose y|5L%,i
* Open. You can then make changes to the template in the Source Editor. I=y7$+7%
*/ ><<>4(eF p
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package com.tot.count; gM&IV{k3
import tot.db.DBUtils; ]M7FIDg
import java.sql.*; e&}W#
/** IfK~~XYG
* =-h^j
* @author cS;3,#$
*/ SVe]2ONd
public class CountControl{ 9TW[;P2> )
private static long lastExecuteTime=0;//上次更新时间 D=0YLQ*rP
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 SMEl'y
/** Creates a new instance of CountThread */ ]`/>hH>+~9
public CountControl() {} %QezC+n
public synchronized void executeUpdate(){ 1<YoGm&
Connection conn=null; )+G"57p
PreparedStatement ps=null; vMT f^V
try{ Q(bOar5
conn = DBUtils.getConnection(); {R}F4k
conn.setAutoCommit(false); DB/~Z
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); mmTpF]t
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for(int i=0;i<CountCache.list.size();i++){ 7Sx|n}a-3
CountBean cb=(CountBean)CountCache.list.getFirst(); z'YWomfZm
CountCache.list.removeFirst(); ,;$OaJFT
ps.setInt(1, cb.getCountId()); p
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ps.executeUpdate();⑴ 1q6)R/P
//ps.addBatch();⑵ vK',!1]y
} H;/do-W[
//int [] counts = ps.executeBatch();⑶ Mog>W&U
conn.commit(); [,o:nry'a
}catch(Exception e){ ,Z
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e.printStackTrace(); R}nvSerVb
} finally{ 0*gvHVd/l
try{ r9[S%Def
if(ps!=null) { Z`Y&cK