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: /@wm?ft6Gk
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CountBean.java ~(%G;fZ?x
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/* m7RWu I,
* CountData.java iz*aBXV A[
* |Cen5s
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* Created on 2007年1月1日, 下午4:44 H<NYm#a"
* 1/&j'B
* To change this template, choose Tools | Options and locate the template under DJ<c
* the Source Creation and Management node. Right-click the template and choose p O:
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* Open. You can then make changes to the template in the Source Editor. z4f5@
*/ $iP#8La:Y
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package com.tot.count; t8P>s})[4
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/**
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* =} vG|
* @author ;<MaCtDt
*/ (O<lVz@8
public class CountBean { G+%ZN
private String countType; M.IV{gj
int countId; Lqch~@E&%#
/** Creates a new instance of CountData */ \DQ; v
public CountBean() {} Jx{,x-I
public void setCountType(String countTypes){ X,OxvmDm
this.countType=countTypes; %
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} X`aED\#\h
public void setCountId(int countIds){ .7kVC
this.countId=countIds; #);
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} i5AhF\7F9
public String getCountType(){ (=PnLP
return countType; >Y\4v}-
} st+Kz uK
public int getCountId(){ S((8DSt*
return countId; He]F~GXP
} ntF(K/~Y
} #JW1JCT
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CountCache.java 1gt[_P2u
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/* {==Q6BG*
* CountCache.java qkBnEPWZy
* qb9%Y/xy
* Created on 2007年1月1日, 下午5:01 v$mA7|(t!
* ~cZ1=,P
* To change this template, choose Tools | Options and locate the template under 19=Dd#Nf
* the Source Creation and Management node. Right-click the template and choose sV*Q8b*
* Open. You can then make changes to the template in the Source Editor. 3;M!]9ms
*/ I+<; Dsp
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package com.tot.count; +L49
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import java.util.*; 1/fvk
/** keWgbj
*
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* @author K3Xy%pqR#
*/ *Z0}0<
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public class CountCache { Fj&vWj`*
public static LinkedList list=new LinkedList(); %(e=Q^=
/** Creates a new instance of CountCache */ _ Po9pZ
public CountCache() {} Ec[:6}
public static void add(CountBean cb){ WI6er;D
if(cb!=null){ K{iayg!k
list.add(cb); *1%g=vb
} {Ise (>V
} zCQv:.0L
} TxiJ?sDh*
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CountControl.java Th8Q~*v
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/* \UC4ai2MK
* CountThread.java 1rKR=To
* gTq-\k(
* Created on 2007年1月1日, 下午4:57 +amvQ];?Q8
* awawq9)Y
* To change this template, choose Tools | Options and locate the template under O@$hG8:
* the Source Creation and Management node. Right-click the template and choose 3gM{lS}h#
* Open. You can then make changes to the template in the Source Editor. qJK^i.e
*/ vd;wQ
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package com.tot.count; "E8!{
import tot.db.DBUtils; :#L B}=HQ
import java.sql.*; dHu]wog
/** !uZ+r%
* ]MHQ"E?
* @author &B.r&K&
*/ dn5v|[ dJ
public class CountControl{ k]JLk"K
private static long lastExecuteTime=0;//上次更新时间 s R~&S))
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %z.G3\s0
/** Creates a new instance of CountThread */ %z2nas$$g
public CountControl() {} IM#+@vv
public synchronized void executeUpdate(){ DTJ
Connection conn=null; Ky'^AN]
PreparedStatement ps=null; eJwr
try{ Z5U~g?
conn = DBUtils.getConnection(); PY2`RZ/ @
conn.setAutoCommit(false); 9w(j2i
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); K1hw'AaQ
for(int i=0;i<CountCache.list.size();i++){ vIRE vj#U
CountBean cb=(CountBean)CountCache.list.getFirst(); 5bAXa2Vt
CountCache.list.removeFirst(); WDX?|q9rCt
ps.setInt(1, cb.getCountId()); #[si.rv->
ps.executeUpdate();⑴ H z6H,h
//ps.addBatch();⑵ q[#\qT&QU
} j NY8)w_
//int [] counts = ps.executeBatch();⑶ ]@f6O*&=
conn.commit(); Cse0!7_T
}catch(Exception e){ _ E%[D(
e.printStackTrace(); mSzwx/3"
} finally{ p"JSYF
9]
try{ EW!$D
if(ps!=null) { UtutdkaS
ps.clearParameters(); i~.[iZf|
ps.close(); F>M$|Sc2
ps=null; a~%ej.)l
} JC#@sJ4az)
}catch(SQLException e){} Dux`BKl
DBUtils.closeConnection(conn); G^R;~J*TDE
} Y}Dp{
} 06`__$@h
public long getLast(){ _(jE](,
return lastExecuteTime; w(yU\
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} 08f~vw"
public void run(){ -3V~YhG
long now = System.currentTimeMillis(); i`Yf|^;@2>
if ((now - lastExecuteTime) > executeSep) { b'OO~>86
//System.out.print("lastExecuteTime:"+lastExecuteTime); x
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//System.out.print(" now:"+now+"\n"); -r2cK{Hhp&
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); </%H 'V@
lastExecuteTime=now; ?
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executeUpdate(); 9t[278B6
} sV6A&