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: *B{j.{
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CountBean.java aKuSd3E@#
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/* >ByXB!Wi+
* CountData.java ``e$AS
* *nsAgGKKM^
* Created on 2007年1月1日, 下午4:44 oDYRQozo>
* GBFtr
* To change this template, choose Tools | Options and locate the template under [7S} g
* the Source Creation and Management node. Right-click the template and choose _DNHc*
* Open. You can then make changes to the template in the Source Editor. j;3[KLmuK%
*/ me ks
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package com.tot.count; p>;_e(
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/** u[/m|z
* q]N:Tpm9
* @author /&{$ pM|?
*/ )!:Lzi
public class CountBean { lBFMwJU)
private String countType; )
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int countId; p4i]7o@
/** Creates a new instance of CountData */ 16i"Yg!*
public CountBean() {} x61 U[/r
public void setCountType(String countTypes){ H;fxxu`cS
this.countType=countTypes; z0*_^MH
} MxcFvo*LCp
public void setCountId(int countIds){ wz.6du6-
this.countId=countIds; 7=OQ8IM!
} H4!+q:<
public String getCountType(){ /E5 5Pec
return countType; ^:* 1d
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} ?Wt$6{)
public int getCountId(){ *`Yv.=cd
return countId; JEgx@};O
} Ox'/`Mppw
} >P $;79<
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CountCache.java `zt_7MD
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/* O
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* CountCache.java k{$ ao
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* Created on 2007年1月1日, 下午5:01 ku
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* !o+_T?
* To change this template, choose Tools | Options and locate the template under ]mXLg:3B
* the Source Creation and Management node. Right-click the template and choose L%c0 Z@[~
* Open. You can then make changes to the template in the Source Editor. b2=0}~LK
*/ 'fNKlPMv4D
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package com.tot.count; lF?tQB/a
import java.util.*; S&Ee,((E(
/** h=_0+\%
* v\"S
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* @author Io|Aj
*/ 0{PzUIM,W
public class CountCache { =)`
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public static LinkedList list=new LinkedList(); t2iv(swTe
/** Creates a new instance of CountCache */ $gM8{.!
public CountCache() {} <K4,7J$}h
public static void add(CountBean cb){ ZzBQe
if(cb!=null){ U}l14
list.add(cb); zf>5,k'x'A
} C2w2252T
} 5W@jfh)
} Tl|:9_:t
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CountControl.java $Qy7G{XJ[^
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/* rf%7b8[v
* CountThread.java -}6xoF?
* OOz[-j>'Y+
* Created on 2007年1月1日, 下午4:57 LJTQaItdqJ
* d{de6 `
* To change this template, choose Tools | Options and locate the template under 3#45m+D
* the Source Creation and Management node. Right-click the template and choose e=QK}gzX
* Open. You can then make changes to the template in the Source Editor. uH;-z_Wpn!
*/ :BGA.
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package com.tot.count; @M8|(N%
import tot.db.DBUtils; 2JS`Wqy
import java.sql.*; Z0>DNmH*
/** @hImk`&[N
* #vqo -y7@
* @author KyO8A2'U
*/ $VQtwuYt
public class CountControl{ z5X~3s\dP
private static long lastExecuteTime=0;//上次更新时间 z]bwnJfd
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 zn@N'R/
/** Creates a new instance of CountThread */ (x$9~;<S*d
public CountControl() {} |fY/i]
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public synchronized void executeUpdate(){ 34R!x6W0
Connection conn=null; zPKr/
PreparedStatement ps=null; @AYo-gf
try{ =?(~aV
conn = DBUtils.getConnection(); `K
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conn.setAutoCommit(false); oo$MWN8a>r
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); o(Cey7
for(int i=0;i<CountCache.list.size();i++){ 'XUKN/.
CountBean cb=(CountBean)CountCache.list.getFirst(); 7RvUH-S[
CountCache.list.removeFirst(); &X]\)`j0
ps.setInt(1, cb.getCountId()); A[YpcG'9
ps.executeUpdate();⑴ l@hjP1o
//ps.addBatch();⑵ m G1IQ!
} a3>zoN
//int [] counts = ps.executeBatch();⑶ Wi}FY }f
conn.commit(); s$*'^:
}catch(Exception e){ x)_@9ldYv
e.printStackTrace(); m%8qZzqk
} finally{ ;!T{%-tP
try{ ?n\*,{9
if(ps!=null) { .~gl19#:T
ps.clearParameters(); P~FUS%39"o
ps.close(); Fv)7c4
ps=null; Z_1*YRBY;
} (:+>#V)pZ
}catch(SQLException e){} T^}
DBUtils.closeConnection(conn); X+n`qiwq
} RP`2)/sMT
} \ M/6m^zS
public long getLast(){ $,hwU3RVxc
return lastExecuteTime; Y3ZK%OyPR
} J%]D%2vnk`
public void run(){ ^5 t
long now = System.currentTimeMillis(); Ut)r&?
if ((now - lastExecuteTime) > executeSep) { 2_t=P|Uo
//System.out.print("lastExecuteTime:"+lastExecuteTime); 9(!]NNf!
//System.out.print(" now:"+now+"\n"); cDXsi#Raj
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); VRW]a
lastExecuteTime=now; AP\ofLmq
executeUpdate(); v1.q$ f^(
} Us~ X9n_F
else{ !z
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); qYp$fmj
} efuK
} bO/*2oau
} ,goBq3[%?
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 &(xUhX T
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类写好了,下面是在JSP中如下调用。 XDD<oo
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<% !1uzX
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CountBean cb=new CountBean(); [[)_BmS5r
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); <Jp1A#
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CountCache.add(cb); fj'jNE
out.print(CountCache.list.size()+"<br>"); C6&( c
CountControl c=new CountControl(); YTU.$t;Ez
c.run(); &}`K^5K|O:
out.print(CountCache.list.size()+"<br>"); aP>37s
%>