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\Rq0N]' M
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CountBean.java qXP)R/~OZ
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/* X o{Ce%L
* CountData.java q'q'v
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* *A
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* Created on 2007年1月1日, 下午4:44 nSgg'I(
* *!lq1h
* To change this template, choose Tools | Options and locate the template under r `28fC
* the Source Creation and Management node. Right-click the template and choose a]
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* Open. You can then make changes to the template in the Source Editor. /c__{?go
*/ Y5PIR9 -
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package com.tot.count; _qJ[~'m<^C
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/** oBKZ$&_h
* H\^5>ccU>V
* @author <~X=6
*/ 1pO ;aG1O
public class CountBean { AvP*p{we
private String countType; $T]1<3\G
int countId; I2K52A+
/** Creates a new instance of CountData */ HmRwh
public CountBean() {} OXA_E/F
public void setCountType(String countTypes){ %#ms`"H
this.countType=countTypes; /KlA7MH 6
} 3)42EM'9(
public void setCountId(int countIds){ +S0A`rL
this.countId=countIds; i!YZF$|
} +zz9u?2C`
public String getCountType(){ >JCSOI
return countType; OdwSNG
} +<bq@.x
public int getCountId(){ McH*J j
return countId; D95$
} .'D+De&y
} POUB{ba
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CountCache.java gEU)UIJ
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/* pN4!*7M
* CountCache.java "%A[%7LY
* rv|k8
* Created on 2007年1月1日, 下午5:01 "eh"'Z
* \+L_'*&8
* To change this template, choose Tools | Options and locate the template under J,m.LpY
* the Source Creation and Management node. Right-click the template and choose /x-Ja[kL
* Open. You can then make changes to the template in the Source Editor. UkXc7D^jwm
*/ ><`.(Z5c
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package com.tot.count; !!Mp;h'}-
import java.util.*; 9OT2yCT
/** glk
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* Zb);08X
* @author i&.F}bEi
*/ jcx/ZR
public class CountCache { >`,v?<>+
public static LinkedList list=new LinkedList(); t#Yyo$9
/** Creates a new instance of CountCache */ <uv{/L
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public CountCache() {} \UtUP#Y{t
public static void add(CountBean cb){ uVOpg]8d
if(cb!=null){ ZpI _/
list.add(cb); TSHp.ABf
} ] ^
} D8[&}D4
} |nU:
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CountControl.java ,ISq7*%F
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/* >KGQ#hnH
* CountThread.java @$+l ^"#-]
* #)cRD#0
* Created on 2007年1月1日, 下午4:57 Im6ymaf9
* 5:n&G[Md
* To change this template, choose Tools | Options and locate the template under sPc\xY
* the Source Creation and Management node. Right-click the template and choose \hNMTj#O
* Open. You can then make changes to the template in the Source Editor. >]C;sP
*/ -!;vX
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package com.tot.count; :MJBbrV
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import tot.db.DBUtils; tEP^w
import java.sql.*; Kau*e8
/** {6/%w,{,
* /xsa-F
* @author a[9;Okm#
*/ Wuc,Cjm9(!
public class CountControl{ T("Fh}
private static long lastExecuteTime=0;//上次更新时间 NG5H?hVN=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 5bZ`YO
/** Creates a new instance of CountThread */ 2$1rS}}
public CountControl() {} Ej.D!@
public synchronized void executeUpdate(){
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Connection conn=null; jN5Sc0|b
PreparedStatement ps=null; 3t%uUkXl
try{ o2Pj|u*X
conn = DBUtils.getConnection(); *jA%.F
conn.setAutoCommit(false); }$AC0
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); @ Cqg2
for(int i=0;i<CountCache.list.size();i++){ ZTt%7K"L
CountBean cb=(CountBean)CountCache.list.getFirst(); =WDf [?ED
CountCache.list.removeFirst(); \dufKeiS&a
ps.setInt(1, cb.getCountId()); <;U"D.'
ps.executeUpdate();⑴ cpE&Fba}"
//ps.addBatch();⑵ wQ[2yq
} !lu$WJ{M
//int [] counts = ps.executeBatch();⑶ Z|wZyt$$
conn.commit(); *+@/:$|U
}catch(Exception e){ WWE?U-o
e.printStackTrace(); vO4
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} finally{ kO2im+y
try{ WQ"ZQ
if(ps!=null) { #NL1N_B
ps.clearParameters(); EidIi"sr
ps.close(); DlIfr6F
ps=null; Pu
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} T<! `~#kM
}catch(SQLException e){} ?pQ, 5+8
DBUtils.closeConnection(conn); }T(|\
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} vBM\W%T|d
} ?0_i{BvN
public long getLast(){ tbOe,-U-@
return lastExecuteTime; (!Ml2
} P<2yCovn`
public void run(){ xsAF<:S\
long now = System.currentTimeMillis(); r-Dcc;+=Q
if ((now - lastExecuteTime) > executeSep) { !uHI5k,f
//System.out.print("lastExecuteTime:"+lastExecuteTime); #UXmTrZ.
//System.out.print(" now:"+now+"\n"); CT"0"~~
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ) mv}u~
lastExecuteTime=now; lbv, jS
executeUpdate(); k?xtZ,n{s
} Bpk%,*$*)
else{ 8q tNK>D
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); "Ny_RF
} a`|/*{
} 1 !\pwd@{
} UdLC]
//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 G.oaDGy
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类写好了,下面是在JSP中如下调用。 yUH8
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<% ^i:%;oeG
CountBean cb=new CountBean(); 4Nq n47|>e
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); y8<,>
CountCache.add(cb); =BGc@:2
out.print(CountCache.list.size()+"<br>"); z,]fR
CountControl c=new CountControl(); A#jiCIc
c.run(); $B$=,^)3
out.print(CountCache.list.size()+"<br>"); \sRRLDj%
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