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: K\?vTgc(
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CountBean.java
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/* "<!|am(
* CountData.java rB=1*.}FLc
* "Jv&=zJ
* Created on 2007年1月1日, 下午4:44 AqN(htGvx
* PCw.NJd$
* To change this template, choose Tools | Options and locate the template under w?Q@"^IL
* the Source Creation and Management node. Right-click the template and choose IDLA-Vxo
* Open. You can then make changes to the template in the Source Editor. s)]|zu0"Ku
*/ 5n(p1OM2q
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package com.tot.count; <&H.pN1_
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/** ?\c*DNM'
* F+hsIsQ
* @author <#`<Ys3b*!
*/ PicO3m
public class CountBean { UK_2i(I"e
private String countType; @Chj0wWZ>
int countId; YjHGdacs
/** Creates a new instance of CountData */ \9ap$
public CountBean() {} _ZR2?y-M
public void setCountType(String countTypes){ bZ3CJ f&mE
this.countType=countTypes; |$1j;#h
} g{<3*,
public void setCountId(int countIds){ anl?4q3;9
this.countId=countIds; k U3]
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} bz}T}nj
public String getCountType(){ iT.hXzPzr*
return countType; + FLzK(
} N4H nW0
public int getCountId(){ ss,6;wfX
return countId; .bpxSU%X
} eQC`e#%
} _k
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CountCache.java &,e@pv c3
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/* t5 5k#`Z
* CountCache.java E"u>&uPH
* 0D.YO<PU
* Created on 2007年1月1日, 下午5:01 (F_#LeJ|
* g00XZ0@
* To change this template, choose Tools | Options and locate the template under H 5sj%
v
* the Source Creation and Management node. Right-click the template and choose Q>sq:R+'
* Open. You can then make changes to the template in the Source Editor. {a(YV\^y|H
*/ D, 3x:nK
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package com.tot.count; 6'qs=Ql
import java.util.*; B&.XGo)
/** 2Db[dk( ]
* C9bf1ddCW&
* @author Gc
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*/ 4|Z3;;%+
public class CountCache { C:P, q6
public static LinkedList list=new LinkedList(); \ u5%+GA-:
/** Creates a new instance of CountCache */ }1(F~6RH
public CountCache() {} L\n_q6n
public static void add(CountBean cb){ 6.K)uQgjmv
if(cb!=null){ vk[Km[(U'
list.add(cb); @$~%C) %u
} jfgAI7;b
} 4'X^YBm
}
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CountControl.java #kV=;(lq
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/* F!SmCE(0x
* CountThread.java {)k}dr
* [m('Y0fwO^
* Created on 2007年1月1日, 下午4:57 BQw#PXp3
* 9nd'"$
* To change this template, choose Tools | Options and locate the template under z?E:s.4F
* the Source Creation and Management node. Right-click the template and choose ux-Fvwoh
* Open. You can then make changes to the template in the Source Editor. Kb4u)~S:
*/ NCl={O9<j
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package com.tot.count; c()F%e:n
import tot.db.DBUtils; r0S"}<8O
import java.sql.*; \mv7"TM
/** GS)l{bS#[O
* ~0worI?
* @author gbKms;:
*/ ^*Rr x
public class CountControl{ 'MsxZqW"~
private static long lastExecuteTime=0;//上次更新时间 4pA(.<#A
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 \Dr@n^hk@[
/** Creates a new instance of CountThread */ ]A!Gr(FHQ
public CountControl() {} |yQ3H)qB#
public synchronized void executeUpdate(){ #x"pG
Connection conn=null; c: #1Aym
PreparedStatement ps=null; 9~u1fk{
try{ !@ bN
conn = DBUtils.getConnection(); YFsEuaV
conn.setAutoCommit(false); m:
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); :Fm+X[n
for(int i=0;i<CountCache.list.size();i++){ Pm;"Y!S<
CountBean cb=(CountBean)CountCache.list.getFirst(); LI(Wu6*Y
CountCache.list.removeFirst(); Yo:>m*31
ps.setInt(1, cb.getCountId()); uZW1
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ps.executeUpdate();⑴ H\)on"
//ps.addBatch();⑵ Ym0Xl(Se
} a"hlPJlG
//int [] counts = ps.executeBatch();⑶ pspV~9,
conn.commit(); mJWl#3
}catch(Exception e){ ZmYp!B_~
e.printStackTrace(); 9h~>7VeZ)
} finally{ A!@D }n
try{ \Fc"Q@.u
if(ps!=null) { VN;Sz,1Z
ps.clearParameters(); q=|>r
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ps.close(); KVqQOh'_T
ps=null; %'EOFv]
} w,JB`jS)/
}catch(SQLException e){} KWhw@y-5j@
DBUtils.closeConnection(conn); eGnc6)x@C
} +mV4Ty
} ks'25tv}F
public long getLast(){ SOeL@!_
return lastExecuteTime; "K~+T\^|k
} iVnrv`k,
public void run(){ 6P+8{?V&
long now = System.currentTimeMillis(); ,uuQj]Dac+
if ((now - lastExecuteTime) > executeSep) { 0UlaB
sv
//System.out.print("lastExecuteTime:"+lastExecuteTime); 4JP01lq'\
//System.out.print(" now:"+now+"\n"); D<Ads
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ^9"|tWf6O
lastExecuteTime=now; o-7>^wV%BD
executeUpdate(); l=bB,7gL
} J;'?(xO3\
else{
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); %VSST?aUvX
} !]5F2~"v
} O/l|\n
} 3P'.)=}
//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 jskATA
/
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类写好了,下面是在JSP中如下调用。 mVU(u_lh
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<% E%jOJA
CountBean cb=new CountBean(); `^(6{p ?
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); UHweV:(|T
CountCache.add(cb); 8pt;''
out.print(CountCache.list.size()+"<br>"); Y@RPQPmIQ
CountControl c=new CountControl(); _vvnxG!x&
c.run(); h^34{pKDn
out.print(CountCache.list.size()+"<br>"); hRGK W
%>