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: c7@[RG !
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CountBean.java WelB"L
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/* -Mzm~@_s]
* CountData.java ,In}be$:
* [j 'lB
* Created on 2007年1月1日, 下午4:44 (5GjtFojY|
* "+A8w
* To change this template, choose Tools | Options and locate the template under om{aws;
* the Source Creation and Management node. Right-click the template and choose o&RNpP*
* Open. You can then make changes to the template in the Source Editor. A5^tus/y
*/ E*s8 nQ"
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package com.tot.count; jm0v=m7
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/** ;<H\{w@D
* ki?ETC
* @author 9+!"[
*/ lpnPd{kE
public class CountBean { BM[jF=0
private String countType; o)+Uyl
int countId; Q tl!f
/** Creates a new instance of CountData */ 'RpX&g
public CountBean() {} y eWB.M~X
public void setCountType(String countTypes){ zt2#6v
this.countType=countTypes; H{g&yo
} qa,i:T(w
public void setCountId(int countIds){ #@:GLmD%
this.countId=countIds; j4+kL4M@H
} (%)<jg1
public String getCountType(){ evlz R/
return countType; uF\ ;m.
} c^7QiTt_
public int getCountId(){ ]5+<Rqdbg
return countId; R]"
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} h@+(VQ
} &d=ZCaP
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CountCache.java o{OY1 ;=6
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/* "bA8NQIP
* CountCache.java 9uW\~DwsZ%
* mI,!8#
* Created on 2007年1月1日, 下午5:01 /{!?e<N>
* 0[R7HX-@
* To change this template, choose Tools | Options and locate the template under w0,rFWS
* the Source Creation and Management node. Right-click the template and choose ~ekV*,R"
* Open. You can then make changes to the template in the Source Editor. eVRjU
*/ ]dL#k>$0q
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package com.tot.count; >?(}F':
import java.util.*; :,Mg1Zf
/** dPmNX-'7
* %<h+_(\h
* @author wqAj=1M\
*/ V%JG :'6L
public class CountCache { O[^u<*fi{
public static LinkedList list=new LinkedList(); :\KJw
/** Creates a new instance of CountCache */ $kxP{0u
public CountCache() {} `:kI@TPI_C
public static void add(CountBean cb){ }o7"2hht
if(cb!=null){ p]x9hZ
list.add(cb); 5^C.}/#>F
} Yl"l|2
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} cc:,,T/i
} wg=-&-
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CountControl.java Mcqym8,q|3
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/* f~{4hVA
* CountThread.java 2Z7r ZjXW
* l g*eSx>M
* Created on 2007年1月1日, 下午4:57 !c;BOCqa
* M1J77LfS8
* To change this template, choose Tools | Options and locate the template under a$]i8AeG
* the Source Creation and Management node. Right-click the template and choose jn+BH3e
* Open. You can then make changes to the template in the Source Editor. Bb*P);#.K
*/ -}9># <v
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package com.tot.count; X^)vZL?
import tot.db.DBUtils; qORRpWyx&
import java.sql.*;
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/** ObSRd$M
* aLO'.5
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* @author Gk]6WLi
*/ |yVveJ
public class CountControl{ tl^![Z
private static long lastExecuteTime=0;//上次更新时间 y28 e=i
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 X%
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/** Creates a new instance of CountThread */ |6GDIoZ
public CountControl() {} HD153M,
public synchronized void executeUpdate(){ Hg2Rcl
Connection conn=null; i2 G.<(3O
PreparedStatement ps=null; um*!+Q
try{ Q=#N4[W'
conn = DBUtils.getConnection(); ;lc/FV[/
conn.setAutoCommit(false);
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ,O`~ D~$
for(int i=0;i<CountCache.list.size();i++){ nP#|JRn=
CountBean cb=(CountBean)CountCache.list.getFirst(); >WmTM0
CountCache.list.removeFirst(); 8 EUc
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ps.setInt(1, cb.getCountId()); pvY BhTz0
ps.executeUpdate();⑴ k.!m-5E
//ps.addBatch();⑵ `,$PRN"]
} }$Z0v`
//int [] counts = ps.executeBatch();⑶ h+j{;evN
conn.commit(); G!.%Qqs
}catch(Exception e){ UHFI4{Wz
e.printStackTrace(); D
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} finally{ U$7]*#@&
try{ ?V' zG&n@
if(ps!=null) { cA{7*=G?
ps.clearParameters(); J1"16Uu
ps.close(); }N0v_Nas;v
ps=null; J3c8WS{:
} uO5y{O2W
}catch(SQLException e){} ;-6
DBUtils.closeConnection(conn); kn&>4/')
} T1i}D"H %
} oyq9XW~ D
public long getLast(){ -d_7 q
return lastExecuteTime; n>W*y|UJ
} 4x"9Wr=}
public void run(){ &sg~owz
long now = System.currentTimeMillis(); _ls i,kg?
if ((now - lastExecuteTime) > executeSep) { x`Jh NAO>
//System.out.print("lastExecuteTime:"+lastExecuteTime); !dGSZ|YZ
//System.out.print(" now:"+now+"\n"); Ft 6{g
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ?<STl-]&
lastExecuteTime=now; dZ`c
executeUpdate(); GL'l "L
} `%Dz 8Z
else{ 8C8,Q\WV(~
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); q}cm"lO$
} )<[)7`
} [^0 S#,L
} pYz\GSd
//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 N;R I
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类写好了,下面是在JSP中如下调用。 0[.T`tpN'
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<% lw=!v%L
CountBean cb=new CountBean(); q#\4/Dt
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); >!WH%J
CountCache.add(cb); Dy|)u1?
out.print(CountCache.list.size()+"<br>"); 'f-8P
CountControl c=new CountControl(); /Jf}~}JP
c.run(); u{5+hZ
out.print(CountCache.list.size()+"<br>"); CkR
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