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: Um-[~-
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CountBean.java =k0_eX0
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/* >R!jB]5
* CountData.java 1sdLDw_)p
*
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* Created on 2007年1月1日, 下午4:44 r_6ZO&
* Mz~D#6=
* To change this template, choose Tools | Options and locate the template under 0C6-GKbZ
* the Source Creation and Management node. Right-click the template and choose Hi1JLW,
* Open. You can then make changes to the template in the Source Editor. bPt!yI:
*/ 2M'[,Xe
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package com.tot.count; 4 bH^":i(
pF Rg?-
/** r^a7MHY1
* $LFYoovX
* @author ssxzC4m
*/ wN-d'-z/rd
public class CountBean { scou%K
private String countType; `Kr,>sEAM
int countId; ;^%4Q"
/** Creates a new instance of CountData */ QKN+>X
public CountBean() {} &3Szje
public void setCountType(String countTypes){ nd1+"-,q
this.countType=countTypes; #& Rw&
} 1\>^m
public void setCountId(int countIds){ [t@Mn
this.countId=countIds; &wCg\j_c
} K[r^'P5m
public String getCountType(){ _JE"{ ;
return countType; b@f$nS
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} E:}r5S)4
public int getCountId(){ k $J zH$
return countId; nV:LqF=
} 4$S;(
} ~h85BF5
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CountCache.java QYjsDL><
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/* ;he"ph=>
* CountCache.java ,N[7/kT|
* 8a'.ZdqC?
* Created on 2007年1月1日, 下午5:01 ( _)jkI
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* J| bd)0
* To change this template, choose Tools | Options and locate the template under S(8$S])0
* the Source Creation and Management node. Right-click the template and choose a$" Hvrj
* Open. You can then make changes to the template in the Source Editor. R:k5QD9/&p
*/ ,>-< (Qi
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package com.tot.count; $?<Z!*x
import java.util.*; u TK,&
/** Oz`BEyb]{
* 8b-Q F
* @author khrb-IY@
*/ s,=i_gyPQ
public class CountCache { orfO^;qTY
public static LinkedList list=new LinkedList();
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/** Creates a new instance of CountCache */ U4-g^S[
public CountCache() {} ZUR6n>r
public static void add(CountBean cb){ D.Q=]jOs
if(cb!=null){ M#VE ]J
list.add(cb); ^,8)iV0j_
} J)~L
} bMMh|F
} U`d5vEhT
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CountControl.java n3Z5t
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/*
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* CountThread.java WP+oFkw>
* R0vI bFwj
* Created on 2007年1月1日, 下午4:57 4K\(xd&Q
* ]<pjXVRt"
* To change this template, choose Tools | Options and locate the template under L>%o[tS
* the Source Creation and Management node. Right-click the template and choose e5B Qr$j
* Open. You can then make changes to the template in the Source Editor. m{uxIza
*/ )3w@]5j
% !>I*H
package com.tot.count; #+5pgD2C
import tot.db.DBUtils; aL%AQB,
import java.sql.*; {{MRELipW
/** DRgTe&+
* dhr3,&+T2
* @author CS-uNG6
*/ ayD}r#7
public class CountControl{ pxf$1
private static long lastExecuteTime=0;//上次更新时间 k
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private static long executeSep=60000;//定义更新间隔时间,单位毫秒 }J1tdko#
/** Creates a new instance of CountThread */ F\k+[`%{
public CountControl() {} hn=[1<#^(
public synchronized void executeUpdate(){ YmgLzGk`
Connection conn=null; ?5cI'
PreparedStatement ps=null; mvZw
try{ J<maQ6p
conn = DBUtils.getConnection(); >U*T0FL7
conn.setAutoCommit(false); ? 1$fJ3
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); D'A/wG
for(int i=0;i<CountCache.list.size();i++){ !@'6)/
CountBean cb=(CountBean)CountCache.list.getFirst();
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CountCache.list.removeFirst(); K7W6ZH9;
ps.setInt(1, cb.getCountId()); B'EKM)dA
ps.executeUpdate();⑴ 7`8Ik`lY
//ps.addBatch();⑵ ;Tc`}2
} xs:n\N
//int [] counts = ps.executeBatch();⑶ ;R?I4}O#R8
conn.commit(); %V{7DA&C
}catch(Exception e){ cwWodPNm
e.printStackTrace(); 2e9es
} finally{ 9Fm"ei
try{ e9[|!/./5
if(ps!=null) { 5qoSEI-m
ps.clearParameters(); +H#U~p$
ps.close(); F>[,zN
ps=null; Ii_ojQP-z
} 88h3|'*
}catch(SQLException e){} ),!;| bh
DBUtils.closeConnection(conn); F[[TWf/
} GF%314Xu
} I{:(z3
public long getLast(){ .j>hI="b
return lastExecuteTime; D{d>5P?W
} HnCzbt@
public void run(){ i21Gw41p:
long now = System.currentTimeMillis(); i?e`:}T
if ((now - lastExecuteTime) > executeSep) { $Gv9m
//System.out.print("lastExecuteTime:"+lastExecuteTime); /BV03B
//System.out.print(" now:"+now+"\n"); c#]q^L\x
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); <_Q:'cx'
lastExecuteTime=now; hq/k*;
executeUpdate();
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} 5N*Ux4M
else{ /3:q#2'v
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Nn"+w|v[ev
} u(t#Ze~Y1
} *b}lF4O?
} L^4-5`gj
//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 $N=N(^
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类写好了,下面是在JSP中如下调用。 [[Y0
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<% 0,rTdjH7
CountBean cb=new CountBean(); k{$ ao
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (%o2jroQ#
CountCache.add(cb); !o+_T?
out.print(CountCache.list.size()+"<br>"); ]mXLg:3B
CountControl c=new CountControl(); |7pR)KH3
c.run(); b2=0}~LK
out.print(CountCache.list.size()+"<br>"); *"r~-&IL
%>