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[KN^2YS
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CountBean.java Ddm76LS
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/* }!Diai*C
* CountData.java N[
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* Y|0-m#1F#
* Created on 2007年1月1日, 下午4:44 /_VRO9R\V
* Y#SmZ*zok
* To change this template, choose Tools | Options and locate the template under 'wB Huq
* the Source Creation and Management node. Right-click the template and choose K9I,Q$&xX
* Open. You can then make changes to the template in the Source Editor. pw<q?q%
*/ [oU+b(
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package com.tot.count; e>vUkP y
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/** XoxR5arj
* CtC`:!Q
* @author ?`l=!>C4s
*/ PgG |7='
public class CountBean { [b
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private String countType; B0 oY]r6
int countId; ~&[P`
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/** Creates a new instance of CountData */ n?P 5pJ
public CountBean() {} $?/Xk%d+
public void setCountType(String countTypes){ |3<ehvKy
this.countType=countTypes; uuUVE/^V'
} ev: !,}]w
public void setCountId(int countIds){ d*\C^:Z
this.countId=countIds; &TkbnDuYd~
} <v7KE*#
public String getCountType(){ q@MjeGs%
return countType; ]}l+ !NV<
} D
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public int getCountId(){ @;T#+!
return countId; I>8 @=V~
} ndCS<ojcBP
} = C'e1=]
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CountCache.java 7 NB"oU^h%
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/* aWsKJo>j[#
* CountCache.java X+gz+V/
* 4Jk}/_
* Created on 2007年1月1日, 下午5:01 oCdOC5
* _!^FW%
* To change this template, choose Tools | Options and locate the template under DCt:EhC
* the Source Creation and Management node. Right-click the template and choose im?XXsH'
* Open. You can then make changes to the template in the Source Editor. xu?QK6D:
*/ [A..<[
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package com.tot.count; qn"T?
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import java.util.*; ;`of'9|
/** ^? {kj{v
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* @author vs0H^L
*/ ;~Gpw/]5E
public class CountCache { CU>K
public static LinkedList list=new LinkedList(); U)w|GrxX
/** Creates a new instance of CountCache */ 5G] #yb74
public CountCache() {} RBD7mpd
public static void add(CountBean cb){ >3
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if(cb!=null){ K!:
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list.add(cb); zHs
} ][5p.owJse
} Ah>krE0t
} 4^NHf|UJH
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CountControl.java np\Q&
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/* j_WF38o
* CountThread.java ])wMUJWg2
* /qq&'}TZP
* Created on 2007年1月1日, 下午4:57 j5Wx*~@(
* YlcF-a
* To change this template, choose Tools | Options and locate the template under v3JIUdU=P
* the Source Creation and Management node. Right-click the template and choose +@)$l+kk9
* Open. You can then make changes to the template in the Source Editor. yzNX2u1
*/ D_ZBx+/_?
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package com.tot.count; 5WJkeG ba
import tot.db.DBUtils; oplA'Jgnv
import java.sql.*; 4p.{G%h
/** U}wq~fD
* -Lf6]5$2'
* @author =]xk-MY"|R
*/
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public class CountControl{ >(6\ C
private static long lastExecuteTime=0;//上次更新时间 rnhf(K.{3
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 75}u
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/** Creates a new instance of CountThread */ e/Oj T
public CountControl() {} kt3#_d^El
public synchronized void executeUpdate(){ <$ZT]p T
Connection conn=null; G~tOCp="p
PreparedStatement ps=null; 8v=47G
try{ IC-xCzR
conn = DBUtils.getConnection(); y{?jr$js<
conn.setAutoCommit(false); FuiW\=^
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); {uM{5GSL
for(int i=0;i<CountCache.list.size();i++){ ;_\
CountBean cb=(CountBean)CountCache.list.getFirst(); pbvEIa-Y4
CountCache.list.removeFirst(); 5)v^
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ps.setInt(1, cb.getCountId()); gwz _b
ps.executeUpdate();⑴ udy;Odt
//ps.addBatch();⑵ ;,})VoC\!
} %dU'$)
//int [] counts = ps.executeBatch();⑶ =+=|{l?F
conn.commit(); RH4n0=2
}catch(Exception e){ "l,EcZRjTz
e.printStackTrace(); Lm{ o=v
} finally{ 99>yaW
try{ coVT+we
if(ps!=null) { F}.TT=((8
ps.clearParameters(); 2_\|>g|
ps.close(); %` [`I>
ps=null; +\oHQ=s>}\
} lKwT5ma7
}catch(SQLException e){} n rB27
DBUtils.closeConnection(conn); RF2XJJ
} _r|ytQ)
} !skiD}zd1
public long getLast(){ zwrZ^
return lastExecuteTime; v
4b`19}
} -*l[:5m
public void run(){ [=1?CD
long now = System.currentTimeMillis(); Msu2OF *x
if ((now - lastExecuteTime) > executeSep) { +&zC