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: PA
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CountBean.java G<D8a2q
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/* R[j? \#
* CountData.java Z4Dx:m-
* |-b\N6
}
* Created on 2007年1月1日, 下午4:44 *$BUow/>
* [n)ak)_/
* To change this template, choose Tools | Options and locate the template under cx$h"
* the Source Creation and Management node. Right-click the template and choose kSzap+ nB?
* Open. You can then make changes to the template in the Source Editor. GEF's#YWK
*/ j?m(l,YD|*
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package com.tot.count; vj%"x/TP
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/** nPdkvs
* i .uyfV&F
* @author -dA9x~o
*/ R/Bjc}J'
public class CountBean { eyJWFJh
private String countType; W&)f#/M8
int countId; jVd`J
/** Creates a new instance of CountData */ "Gp Tmu?
public CountBean() {} w01[oU$x=
public void setCountType(String countTypes){ Tp?IK_
this.countType=countTypes; `gx\m=xG
} [*p;+&+/ZM
public void setCountId(int countIds){ 2A;i
this.countId=countIds; %%}l[W
} AXHY$f|
public String getCountType(){ BInSS*L
return countType; Lv['/!DJ|
} dN3^PK
public int getCountId(){ 1C{0 R.
return countId; C/Tk`C&
} N=C t3
} M$%ON>Kq
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CountCache.java #$xtUCqX
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/* ~6n|GxR.[
* CountCache.java PiM(QR
* i@nRZ$ K
* Created on 2007年1月1日, 下午5:01 2|lR@L sr
* zPp22
* To change this template, choose Tools | Options and locate the template under v4s4D1}
* the Source Creation and Management node. Right-click the template and choose bWp:!w#K
* Open. You can then make changes to the template in the Source Editor. W,6q1
*/ ^3$U[u%q/{
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package com.tot.count; f&4+-w.:V|
import java.util.*; f}(4v1T
/** @y7KP$t
* IC'+{3.m8
* @author Ft11?D
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*/ d9:I.SA)E
public class CountCache { dY&v(~&;]
public static LinkedList list=new LinkedList(); H 4ELIF#@
/** Creates a new instance of CountCache */ [-VH%OM
public CountCache() {} j!i*&
public static void add(CountBean cb){ -d'FKOD
if(cb!=null){ M?sax+'
list.add(cb); :?zq!
} G{fPQ=
} ]vz6DJs
} 8%m\J:eR
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CountControl.java t;VMtIW+E
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/* wi7Br&bGi
* CountThread.java #~-Xt!I
* f|B\Y/*X
* Created on 2007年1月1日, 下午4:57 Xydx87L/-e
* /!5ohQlPJ
* To change this template, choose Tools | Options and locate the template under PWl;pBo
* the Source Creation and Management node. Right-click the template and choose KBtqtE'(L
* Open. You can then make changes to the template in the Source Editor. ?%~p@
*/ #BP0MY&
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package com.tot.count; f\=
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import tot.db.DBUtils; }EwE#sZ#
import java.sql.*; lhYJectJa
/** Al*=%nY
* j1g$LAe
* @author 4bGvkxZo`$
*/ 9ns( F:
public class CountControl{ wsB-(
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private static long lastExecuteTime=0;//上次更新时间 {l$)X
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 A4@z+ebb l
/** Creates a new instance of CountThread */ zqdkt `
public CountControl() {} drjNK!XL@
public synchronized void executeUpdate(){ ^2Cqy%x-
Connection conn=null; 9D\E0YG X/
PreparedStatement ps=null; 98 R/^\
try{ D? %*L
conn = DBUtils.getConnection(); W)r|9G8T
conn.setAutoCommit(false); mv:@ D
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); u-iQ
for(int i=0;i<CountCache.list.size();i++){ \Qah*1
CountBean cb=(CountBean)CountCache.list.getFirst(); jm<^WQ%Cc
CountCache.list.removeFirst(); 0qFO+nC
ps.setInt(1, cb.getCountId()); )
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ps.executeUpdate();⑴ jW8ad{
//ps.addBatch();⑵ 8/R$}b><
} P{K\}+9F
//int [] counts = ps.executeBatch();⑶ 5,MM`:{{
conn.commit(); yO7H!}y_
}catch(Exception e){ A2\hmp@A@7
e.printStackTrace(); cD`?"n
} finally{ VO:
try{ jG`PyIgw
if(ps!=null) { dLH@,EKl)
ps.clearParameters(); GPh;r7xg6
ps.close(); h!(#
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ps=null; 6)YckxN^
} 9'H:pb2
}catch(SQLException e){} XkqsL0\
DBUtils.closeConnection(conn); "6%{#TZ
} wS|k3^OV%
} ',[AKXJ
public long getLast(){ h&