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: IMDGinHAy
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CountBean.java ~]_gq;bG
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/* S-\;f jh
* CountData.java "
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* X>`e(1`_O
* Created on 2007年1月1日, 下午4:44 \,i?WgWv
* [80L|?, *
* To change this template, choose Tools | Options and locate the template under ny:4L{)
* the Source Creation and Management node. Right-click the template and choose t_PAXj
* Open. You can then make changes to the template in the Source Editor. }x^q?;7xW
*/ Q^qdm5}UkW
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package com.tot.count; PO,mg?JG(
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/** BuE=(v2}
* !vB8Pk"
* @author n:-:LSa+3
*/ SW
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public class CountBean { $s*\yam?|
private String countType; 0T{Z'3^=
int countId; D)ZGTq`(
/** Creates a new instance of CountData */ ]D@_cxud3
public CountBean() {} A3VXh^y+
public void setCountType(String countTypes){ +O 2H":$
this.countType=countTypes; 2`XG"[@
} +5|wd6
public void setCountId(int countIds){ b42"Y,sbB
this.countId=countIds; #-wtNM%1#
} &>
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public String getCountType(){ Gf(|?"
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return countType; p<w2e
} p_x@FA(
public int getCountId(){ y6bl&_
return countId; @pcmVsIp
} ]chfa
} Q:6i
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CountCache.java kf3 u',}R
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/* 95
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* CountCache.java MCBZq\c
* T2Q`Ax7
* Created on 2007年1月1日, 下午5:01 %s}c#n)N
* Z%]s+V)st
* To change this template, choose Tools | Options and locate the template under -RisZ-n*
* the Source Creation and Management node. Right-click the template and choose vhA4ol
* Open. You can then make changes to the template in the Source Editor. W+v7OSd92
*/ S${n:e0\
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package com.tot.count; Sm@T/+uG:
import java.util.*; ?Vy%<f$
/** IQ$cLr-S
* eI%{/>
* @author D"x;/I
*/ 8.9Z0
public class CountCache { PBXRey7>D
public static LinkedList list=new LinkedList(); IYIlab\TZ
/** Creates a new instance of CountCache */ :qfP>Ok
public CountCache() {} FaNr}$Pe
public static void add(CountBean cb){ F/91Es
if(cb!=null){ 3#O Rfr(
list.add(cb); T d E.e(
} _$g2;X >
} ?AMn>v
} N-
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CountControl.java 7Nu.2q E
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/* Bn4wr
* CountThread.java #CV;Np
* -/g<A~+i]$
* Created on 2007年1月1日, 下午4:57 K Y=$RO
* X_\$hF
* To change this template, choose Tools | Options and locate the template under ` P,-NVB
* the Source Creation and Management node. Right-click the template and choose q*^m8
* Open. You can then make changes to the template in the Source Editor. CVAX?c{
*/ BzXTHFMSy
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package com.tot.count; O30eq 7(
import tot.db.DBUtils; O{<uW-
import java.sql.*; jap5FG+2
/** <Od5}
* <K:L.c!
* @author * YR>u@
*/ :5-t$^R
public class CountControl{ <*@!>6mS
private static long lastExecuteTime=0;//上次更新时间 *v:o`{vM[
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 q |Orv=v
/** Creates a new instance of CountThread */ i4dy0jfN
public CountControl() {} }I"k=>Ycns
public synchronized void executeUpdate(){ #GfM!<q<
Connection conn=null; L$3{L"/
PreparedStatement ps=null; b^'>XT~1J&
try{ =KW~k7TaN
conn = DBUtils.getConnection(); 6[3>[ej:x
conn.setAutoCommit(false); \GdsQAF"
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); n48%Uwa,
for(int i=0;i<CountCache.list.size();i++){ w gkY\Q
CountBean cb=(CountBean)CountCache.list.getFirst(); El^V[s'3
CountCache.list.removeFirst(); p7p6~;P
ps.setInt(1, cb.getCountId()); ayZWt| iHA
ps.executeUpdate();⑴ C5^9D
//ps.addBatch();⑵ wl0 i3)e:
} {O_`eS
//int [] counts = ps.executeBatch();⑶ ?hOvY)
conn.commit(); lbj_if;
}catch(Exception e){ m+EtB6r
e.printStackTrace();
, D}
} finally{ ?/YT,W<c;&
try{ d:g0XP
if(ps!=null) { =kBWY9:$,
ps.clearParameters(); u
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ps.close(); .|/VD'xV"
ps=null; LrhQG
} ~kOXMLRg
}catch(SQLException e){} ?#|in}
DBUtils.closeConnection(conn); 4<S=KFT_
} 9)S,c=z83
} nyx(0
public long getLast(){ Og :aflS
return lastExecuteTime; yUX<W'-Hev
} 1/vcj~|)t
public void run(){ k+As#7V
long now = System.currentTimeMillis(); Tsl0$(2W
if ((now - lastExecuteTime) > executeSep) { TDjjaO
//System.out.print("lastExecuteTime:"+lastExecuteTime); uf}Q{@Ab
//System.out.print(" now:"+now+"\n"); w\Bx=a>vc
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); te8lF{R
lastExecuteTime=now; X?Z#k~JR
executeUpdate(); uY*|bD`6&
} H2D j`0
else{ 1
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//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); *q+z5G;O
} 8A3!XA
} U0t~H{-H
} *Wmn!{\g
//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 7K}Sk
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类写好了,下面是在JSP中如下调用。 p?+*R@O
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<% Uq}-<q
CountBean cb=new CountBean(); ??.9`3CYo
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); `VxfAV?}
CountCache.add(cb); .ko}m{
out.print(CountCache.list.size()+"<br>"); _LUTIqlvi
CountControl c=new CountControl(); p4-bD_
c.run(); :~1p
out.print(CountCache.list.size()+"<br>"); 'aoHNZfxw
%>