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: RgE`H r
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CountBean.java }I"C4'(a
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/* Hd|l6/[xz
* CountData.java 7io["zW
* :$ 5A3i
* Created on 2007年1月1日, 下午4:44 IUcL*
* S2~cAhR|M
* To change this template, choose Tools | Options and locate the template under .1x04Np!
* the Source Creation and Management node. Right-click the template and choose $Gn.G_"v
* Open. You can then make changes to the template in the Source Editor. )
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*/ WeI+|V$
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package com.tot.count; 8!g
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/** {Z.6\G&q
* "cH RGJG#
* @author Gn]36~)*H
*/ h$>F}n
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public class CountBean { 2EY"[xK|
private String countType; F /b`[
int countId; .b:!qUE^
/** Creates a new instance of CountData */ J3Mb]X)_}
public CountBean() {} j)1y v.
public void setCountType(String countTypes){ q^@*{H
this.countType=countTypes; ]' mbHkn68
} D-3[#~MV
public void setCountId(int countIds){ R+sT
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this.countId=countIds; FoefBo?g65
} k1 5vs
public String getCountType(){ &{iC:zp
return countType; Vs>Pv$kW
} gjF5~
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public int getCountId(){ yu?5t?vf
return countId; $o6/dEKQ
} yI w}n67
} l }{{7~C`
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CountCache.java VFT@Ic#]
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/* BEZ~<E&0H
* CountCache.java A#uU]S
* ]{-.?W*$
* Created on 2007年1月1日, 下午5:01 p<R:[rz
* ^Fk;t
* To change this template, choose Tools | Options and locate the template under KaIKb=4L|
* the Source Creation and Management node. Right-click the template and choose ia6 jiW x
* Open. You can then make changes to the template in the Source Editor. -K"'F`;W
*/ vwR_2u
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package com.tot.count; FU|brSt
import java.util.*; ]A4=/6`g?b
/** |5@Ra@0
* &\zYbGU
* @author W?7l-k=S
*/ wcHk]mLM
public class CountCache { [|\6AIoS
public static LinkedList list=new LinkedList(); O5dS$[`j\p
/** Creates a new instance of CountCache */ 01bCP
public CountCache() {} 2Gyq40
public static void add(CountBean cb){ Y#U.9>h
if(cb!=null){ $+eeE
list.add(cb); $0* sjXV
} Xz]l#w4Pp
} D{9a'0J
} ktu?-?#0,
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CountControl.java Q+CJd>B
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/* xBHf~:!
* CountThread.java +cpb!YEAb
* eSPS3|YYn
* Created on 2007年1月1日, 下午4:57 Po>6I0y
* lH fZw})d
* To change this template, choose Tools | Options and locate the template under opX07~1
* the Source Creation and Management node. Right-click the template and choose ]&'!0'3`
* Open. You can then make changes to the template in the Source Editor. dT`nR"
*/ %$BRQ-O
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package com.tot.count; 8lQ/cGAc
import tot.db.DBUtils; b,~'wm8:A
import java.sql.*; XY0kd&N8
/** 2OG/0cP
* L3]J8oEmU
* @author ra^</o/
*/ L F?/60
public class CountControl{ 0%xk tf
private static long lastExecuteTime=0;//上次更新时间 UMcM&yu-
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 +|?a7qM
/** Creates a new instance of CountThread */ + V=<vT
public CountControl() {} b:1B
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public synchronized void executeUpdate(){ %Z;RY5
Connection conn=null; EeaJUK]z9
PreparedStatement ps=null; TtJX(N~
try{ #rHMf%0
conn = DBUtils.getConnection(); >WHajYO"
conn.setAutoCommit(false); #v
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); UG vIH m
for(int i=0;i<CountCache.list.size();i++){ [[T7s(3
CountBean cb=(CountBean)CountCache.list.getFirst(); s'O%@/;J
CountCache.list.removeFirst(); 6O4*OR<&
ps.setInt(1, cb.getCountId()); o*T?f)_[p
ps.executeUpdate();⑴ osc8;B/
//ps.addBatch();⑵ /X8a3Eqp9
} `n+uA~
//int [] counts = ps.executeBatch();⑶ F'~r?D
conn.commit(); Yjg$o:M
}catch(Exception e){ l4gH]!/@
e.printStackTrace(); {[uhIJD3g6
} finally{ 4Q+ ,_iP
try{ ^;II@n
i
if(ps!=null) { c coi
ps.clearParameters(); \ZnA%hC
ps.close(); N\|B06X
ps=null; n%r>W^2j
} 8] LF{Obz[
}catch(SQLException e){} zDg*ds\
DBUtils.closeConnection(conn); f y|JE9Io_
} erI&XI
} <v ub
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public long getLast(){ sta/i?n
return lastExecuteTime; ImQ-kz?b
} (R=ZI
public void run(){ dC<%D'L*
long now = System.currentTimeMillis(); ,WdSJ BK'a
if ((now - lastExecuteTime) > executeSep) { ?;=7{Ej
//System.out.print("lastExecuteTime:"+lastExecuteTime); *wAX&+);
//System.out.print(" now:"+now+"\n"); hl[<o<`Q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ~vP_c(8f
lastExecuteTime=now; oD%n}
executeUpdate(); 6cg,L:j#
} t:dvgRJt*
else{ 4][VK/v+
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); M"mvPr9
} "eoPG#]&
} Z9mI%sC[(
} t<`wK8)
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 :Gz$(!j1.'
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类写好了,下面是在JSP中如下调用。 nUY)LnI
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<% ; 8VZsh
CountBean cb=new CountBean(); Z=hn}QY.(
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); +VIEDV+
CountCache.add(cb); gISA13
out.print(CountCache.list.size()+"<br>"); jHMP"(]
CountControl c=new CountControl(); 9[t-W:3c7
c.run(); 4o''C |ND
out.print(CountCache.list.size()+"<br>"); b`wT*&
%>