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: aL)$b
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CountBean.java EXHR(t}e
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/* _3&/(B%H
* CountData.java A$m<@%Sz
* m/?h2McS
* Created on 2007年1月1日, 下午4:44 ~XQ$aRl&
* 8p,>y(o
* To change this template, choose Tools | Options and locate the template under XGk}e4;_
* the Source Creation and Management node. Right-click the template and choose 3 2y[
* Open. You can then make changes to the template in the Source Editor. Zd XKI{b
*/ `,-STIh)
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package com.tot.count; }200g_^
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/** m5qCq9Y
* _LsYMUe
* @author L9J;8+ge
*/ ^ 0eO\wc?O
public class CountBean { ybYXD?
private String countType; -x?Hj/
int countId; 3N3*`?5c<
/** Creates a new instance of CountData */ kA,4$2_o
public CountBean() {} JP%RTGu
public void setCountType(String countTypes){ l#ygb|=x
this.countType=countTypes; y4r2}8fi
} !qS05
public void setCountId(int countIds){ +{^'i P
this.countId=countIds; $w `veP
} ck~ '`<7
public String getCountType(){ `&,_xUA
return countType; /J.0s0@
} w 3d\0ub
public int getCountId(){ m9I(TOw
return countId; `.`FgaJ
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} e
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} oFn4%S:
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CountCache.java :SdIU36
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/* ~QO<
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* CountCache.java .Nk6
* *V<)p%l.
* Created on 2007年1月1日, 下午5:01 F]0Jwm{
* WS5"!vz
* To change this template, choose Tools | Options and locate the template under -BjEL;
* the Source Creation and Management node. Right-click the template and choose /rOnm=P+Q
* Open. You can then make changes to the template in the Source Editor. 6ku8`WyoF
*/ d}pGeU'
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package com.tot.count; "d:.*2Z2
import java.util.*; P 4H*jy@?
/** `43vxcMg
* uzO{{S-
* @author CP@o,v-
*/ bsMC#xT
public class CountCache { eoC<a"bJ>
public static LinkedList list=new LinkedList(); qb9}&'@:
/** Creates a new instance of CountCache */ U#iT<#!l2
public CountCache() {} ~6MMErSj
public static void add(CountBean cb){ (w}r7`n
if(cb!=null){ qjzZ}
list.add(cb); $Q#?`j
} 37~rm
} j}"]s/= 6
} <G&WYk%u*
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CountControl.java %{Xm5#m
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/* 65uZLsQ
* CountThread.java -z&9DWH
* 83B\+]{hD
* Created on 2007年1月1日, 下午4:57 ;+r0
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* rrbZ+*U
* To change this template, choose Tools | Options and locate the template under s~/57S
* the Source Creation and Management node. Right-click the template and choose ]m RF[b$
* Open. You can then make changes to the template in the Source Editor. Fu#Y7)r
*/ &8zk3
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package com.tot.count; l(.7t'
import tot.db.DBUtils; :S#eg1y.w]
import java.sql.*; vW9^hbdx
/** {~ ":;
* @f-0X1C."N
* @author y B1W>s8&
*/ y+l<vJu
public class CountControl{ ST#PMb'izn
private static long lastExecuteTime=0;//上次更新时间 ZjE~W>pkQ
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 qmQFHC_
/** Creates a new instance of CountThread */ Lax9
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public CountControl() {} Qa>%[jx,@,
public synchronized void executeUpdate(){ ozT._C
Connection conn=null; byp.V_a}/
PreparedStatement ps=null; W5TqC
try{ #cR57=M}
conn = DBUtils.getConnection(); twAw01".
conn.setAutoCommit(false); kWI]fZ_n
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); Qh/lT$g
for(int i=0;i<CountCache.list.size();i++){ TeOFAIU
CountBean cb=(CountBean)CountCache.list.getFirst(); ?exALv'B
CountCache.list.removeFirst(); cPx66Dh&
ps.setInt(1, cb.getCountId()); "pR $cS
ps.executeUpdate();⑴ <<i=+ed8eP
//ps.addBatch();⑵ >qr=l,Hi
} gX/|aG$a!U
//int [] counts = ps.executeBatch();⑶ [''=><
conn.commit(); $cyLI+uz|
}catch(Exception e){ Uy:@,DW
e.printStackTrace(); B[C7G7<B
} finally{ (
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try{ *4zoAs lU1
if(ps!=null) { h\Z3y AYd
ps.clearParameters(); hLu&lY
ps.close(); o,iS&U"TC
ps=null; 4&#vU(-H
} r7zf+a]
}catch(SQLException e){} $[WN[J
DBUtils.closeConnection(conn); Ufyxw5u5F
} Z?vY3)
} FI80vV7
public long getLast(){ &p