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: &pHSX
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CountBean.java t2x2_;a
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/* )XCG4-1
* CountData.java mR,w~wP
* 9*~bAgkWI
* Created on 2007年1月1日, 下午4:44 I]GGmN
* !0-KB#
* To change this template, choose Tools | Options and locate the template under E' -lpE
* the Source Creation and Management node. Right-click the template and choose j<NZ4Rf
* Open. You can then make changes to the template in the Source Editor. 0JT"Pv_
*/ D/[;Y<X#V
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package com.tot.count; w#6)XR|+,.
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/** R7\T.;8+
* )[b\wrc
* @author + Vv+<M
*/ =[JstiT?E
public class CountBean { ;*%3J$T+
private String countType; i?wEd!=w
int countId; b :WA}x V
/** Creates a new instance of CountData */ k3(q!~a:.}
public CountBean() {} QmgO00{
public void setCountType(String countTypes){ NF "|*S
this.countType=countTypes; ($nQmr;t
} `T\_Wje(
public void setCountId(int countIds){ bv^wE,+?o
this.countId=countIds; f9K+o-P.h
} 7D(Eo{ue
public String getCountType(){ KvjsibI/Y
return countType; CCHGd&\Z
} %1mIngW=g
public int getCountId(){ B>}B{qi|
return countId; ?B+]Ex(\B,
} YsO3( HS
} 3AcS$.G
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CountCache.java ?;]Xc~
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/* z0H+Or
* CountCache.java Qz4eQlWhp
* iE0x7x P_
* Created on 2007年1月1日, 下午5:01 R
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* 7}1Z7"?
* To change this template, choose Tools | Options and locate the template under Tnv,$KOhs
* the Source Creation and Management node. Right-click the template and choose BUCPO}I
* Open. You can then make changes to the template in the Source Editor. 1%$t;R
*/ r>#4Sr
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package com.tot.count; hG~HV{6
import java.util.*; D&o~4Qvc]
/** gy1R.SN
* ;V?3Hwl
* @author 6&+}Hhe
*/ p;qFMzyS9
public class CountCache { K=!
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public static LinkedList list=new LinkedList(); Up1n0
/** Creates a new instance of CountCache */ j.!5&^;u4
public CountCache() {} wg+[T;0 S
public static void add(CountBean cb){ pocXQEg$]
if(cb!=null){ :HM~!7e
list.add(cb); Q#F9&{'l
} Quwq_.DU
} ]z!Df\I
} g"~`\xhx
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CountControl.java #<y/m*Ota
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/* rB-R(2
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* CountThread.java Ei<m/v
* l_s#7 .9$
* Created on 2007年1月1日, 下午4:57 x~i\*Ox^
* DS+BX`i%#p
* To change this template, choose Tools | Options and locate the template under _FNW[V
* the Source Creation and Management node. Right-click the template and choose OHwH(}H?
* Open. You can then make changes to the template in the Source Editor. D9 Mst6
*/ ~W-l|-eogz
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package com.tot.count; /2''EF';
import tot.db.DBUtils; 1,Es'
import java.sql.*; 1+"d-`'Z2O
/** j115:f
* .}GOHW)}
* @author TS`m&N{i")
*/ 7^V`B^Vu
public class CountControl{ Aj]/A
private static long lastExecuteTime=0;//上次更新时间 \T[OF8yhW
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 F >H\F@Wl
/** Creates a new instance of CountThread */ )gz]F_
public CountControl() {} gL~3z'$
public synchronized void executeUpdate(){ TV|Z$,6l
Connection conn=null; r:PYAb=g
PreparedStatement ps=null; &1Y7Ne
try{ uJ=d!Kn
conn = DBUtils.getConnection(); WZn"I&Z
conn.setAutoCommit(false); KSJ+3_7]k
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); E@%1HO_
for(int i=0;i<CountCache.list.size();i++){ L{GlDoFk
CountBean cb=(CountBean)CountCache.list.getFirst(); Z<W f/
CountCache.list.removeFirst(); He$v'87]
ps.setInt(1, cb.getCountId()); {H>Tv,v|
ps.executeUpdate();⑴ fu{v(^
//ps.addBatch();⑵ v-8{mK`9\
} mq}UUk@
//int [] counts = ps.executeBatch();⑶ MskOPg
conn.commit(); \Unawv~
}catch(Exception e){ {3SK|J`
e.printStackTrace(); Q,:h`%V
} finally{ +vH#xc\'
try{ R%~~'/2V
if(ps!=null) { @=}NMoNH
ps.clearParameters(); y<~(}xsHh
ps.close(); X40JCQx{+
ps=null; 1;?w#/&t
} fLeHn,*,"
}catch(SQLException e){} q,_EHPc
DBUtils.closeConnection(conn); tKeozV[V
} 'K}2 m
} dNCd-ep
public long getLast(){ 4]E1x l
return lastExecuteTime; e\O625
} ?)[=>Kp
public void run(){ ]k BC,m(
long now = System.currentTimeMillis(); 5z_Kkf?o
if ((now - lastExecuteTime) > executeSep) { @+_pj.D
//System.out.print("lastExecuteTime:"+lastExecuteTime); xSO5?eR"u
//System.out.print(" now:"+now+"\n"); ~[kI![
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); d|`8\fq
lastExecuteTime=now; <Fv7JPN%
executeUpdate(); cp"{W-Q{$
} *3h_'3yo@
else{ VZe'6?#
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); DZ $O%
} >s!k"s,
} *=]UWM~]
}
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//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 &_s^C?x
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类写好了,下面是在JSP中如下调用。 n?9FJOqi
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<% L@ejFXQg
CountBean cb=new CountBean(); \Xr*1DI<
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); >t%@)]*N
CountCache.add(cb); rfr]bq5
out.print(CountCache.list.size()+"<br>"); 9w=[}<E
CountControl c=new CountControl(); k]2_vk^
c.run(); MN:LL
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out.print(CountCache.list.size()+"<br>"); Y_~otoSoY
%>