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: :?p{ga9
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CountBean.java V`H#|8\i
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/* I}q-J~s
* CountData.java #E ~FF@a
* =.o-R=:d
* Created on 2007年1月1日, 下午4:44 c3}}cFe
* w1}[lq@
* To change this template, choose Tools | Options and locate the template under )F~_KD)7jJ
* the Source Creation and Management node. Right-click the template and choose a>kDG <.A
* Open. You can then make changes to the template in the Source Editor. i]YQq! B
*/ n -=\n6"P
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package com.tot.count; /F4:1
}
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/** l~=iUZW<
* 2tbqmWw/s
* @author :J~j*_hZ
*/ bo*q{@Ue
public class CountBean { B@=Yj_s
private String countType; O<E0L&4-&
int countId; yp4G"\hN9
/** Creates a new instance of CountData */ 0GR9opZtA
public CountBean() {} $e_ps~{7$
public void setCountType(String countTypes){ Wp]EaYt2D
this.countType=countTypes; g|zK%tR_P
} ]S:@=9JB'
public void setCountId(int countIds){ H|!s.
this.countId=countIds; v]J# SlF
} i f"v4PHq
public String getCountType(){ a2 SQ:d
return countType; Stc\P]%d
} - VE#:&
public int getCountId(){ q1gf9`0
return countId; G!~BA*
} 9=o
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} g\l;>
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CountCache.java Lg?'1dg
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/* }ot _k-
* CountCache.java O`u! P\
* Om^/tp\
* Created on 2007年1月1日, 下午5:01 BNy"YK$
* 4W?<hv+k7*
* To change this template, choose Tools | Options and locate the template under WAa?$"U2
* the Source Creation and Management node. Right-click the template and choose Y;w]u_
* Open. You can then make changes to the template in the Source Editor. }-vBRY
*/ y(dS1.5F
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package com.tot.count; br;G5^j3?
import java.util.*; ]M2<I#hF.
/** ./
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* KRtu@;?
* @author i#lo?\PO>
*/ ypd?mw&1}
public class CountCache { 4yA`);r62
public static LinkedList list=new LinkedList(); 6+5Catsn
/** Creates a new instance of CountCache */ V!P3CNK
public CountCache() {} x.yL'J\)
public static void add(CountBean cb){ 6ZR0_v;TD
if(cb!=null){ *I67SBt
list.add(cb); Ig<p(G.;}
} E1C_d'
} NM@An2
} )
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CountControl.java Fjzk;o
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/* @"!SU'*
* CountThread.java q(7D8xG;F
* :/NN=3e
* Created on 2007年1月1日, 下午4:57
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* `$H
* To change this template, choose Tools | Options and locate the template under M@ kZ(Rkv
* the Source Creation and Management node. Right-click the template and choose =dBrmMh
* Open. You can then make changes to the template in the Source Editor. HWhKX:`l
*/ a,~P_B|@
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package com.tot.count; cnthtv+(~
import tot.db.DBUtils; 9ojhI=:
import java.sql.*; gcxk'd
/** sQZ8<DpB
* f>dkT'4
* @author @>5<m'}2
*/ }^[@m#
public class CountControl{ zRu`[b3u<
private static long lastExecuteTime=0;//上次更新时间 dLf8w>i`T
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 %B*dj9n^q
/** Creates a new instance of CountThread */ 2-0cB$W+
public CountControl() {} )^H9C"7T
public synchronized void executeUpdate(){ B:~;7A\
Connection conn=null; \NU[DHrMP
PreparedStatement ps=null; 05B+WJ1
try{ m;f?}z_\$
conn = DBUtils.getConnection(); }qhK.e
conn.setAutoCommit(false); 5$U>M
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); j\f$r,4
for(int i=0;i<CountCache.list.size();i++){ *]WXM.R8
CountBean cb=(CountBean)CountCache.list.getFirst(); LFyceFbm
CountCache.list.removeFirst(); l7,qWSsnK
ps.setInt(1, cb.getCountId()); 1`lFF_stkP
ps.executeUpdate();⑴ ~,2hP
~
//ps.addBatch();⑵ V^I/nuy
} o2 d~
//int [] counts = ps.executeBatch();⑶ suFOc
conn.commit(); T''+zk
}catch(Exception e){ Ts .Zl{B
e.printStackTrace(); j7#GqVS'
} finally{ Xp6*Y1Y
try{ c)MR+'d\WO
if(ps!=null) { k!=GNRRZE
ps.clearParameters(); r)(BT:2m
ps.close(); X'7S|J6s
ps=null; VtiqAh}4
} O/9%"m:i
}catch(SQLException e){} WG
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DBUtils.closeConnection(conn); |HGb.^f?
} Us,[x Q
} JjLyV`DJ
public long getLast(){ _F@p53WE
return lastExecuteTime; "jO3Y/>S
} @O}j:b
public void run(){ :IVMTdYf
long now = System.currentTimeMillis(); nFnF_
if ((now - lastExecuteTime) > executeSep) { `l2<
//System.out.print("lastExecuteTime:"+lastExecuteTime); otf%kG w
//System.out.print(" now:"+now+"\n"); ll\^9
4]Q
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); k(z<Bm
lastExecuteTime=now; xg,]M/J
executeUpdate(); NK9WrUj)
} =8p+-8M[d
else{ ASZ5;N4u
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); KM}4^Qc
} )]>G,.9C}
} QYfAf3te
} ~}-p5 q2
//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 uuYH6bw*d
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类写好了,下面是在JSP中如下调用。 #oJbrh9J6
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<% ht3T{4qCS
CountBean cb=new CountBean(); B9IXa;
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); (GEi<\16[
CountCache.add(cb); (1AA;)`Kp
out.print(CountCache.list.size()+"<br>"); Di<J6xu
CountControl c=new CountControl(); `JWYPsWk
c.run(); ]~00=nXFM/
out.print(CountCache.list.size()+"<br>"); Cxk$"_
%>