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: ~%<PEl|
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CountBean.java 5&}icS
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/* 46XB6z01
* CountData.java T&R`s+7
* n|,Es!8:o
* Created on 2007年1月1日, 下午4:44 2~ 'Q#(
* #m$H'O[WG\
* To change this template, choose Tools | Options and locate the template under Q@$1!9m
* the Source Creation and Management node. Right-click the template and choose hJ}G5pX
* Open. You can then make changes to the template in the Source Editor. \&TTe8
*/ E32z(:7M
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package com.tot.count; SbGp
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/** Gi<f/xQk>
* vi5~ Rd`
* @author dt5gQ9(B
*/ wSAm[.1i
public class CountBean { BbU&e z8P
private String countType; ADR`j;2
int countId; "Q/3]hc.
/** Creates a new instance of CountData */ =pk'a_P8-
public CountBean() {} PN.6BJvu
public void setCountType(String countTypes){ qHKZ5w
this.countType=countTypes; Yt#($}p
} 'R'>`?Nh
public void setCountId(int countIds){ w}YHCh
this.countId=countIds; RtIc:ym
} {xH
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public String getCountType(){ /ZzlC#`
return countType; s]I],>}RU
} F;b|A`M
public int getCountId(){ mdZELRu
return countId; 78.sf{I
} Y4{`?UM&h
} VtKN{sSnu
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CountCache.java SHGO;
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/* B}M J?uvA
* CountCache.java %]R#}amW
* `Ch6"=t
* Created on 2007年1月1日, 下午5:01 H!Od.$ZIX
* 8odVdivh
* To change this template, choose Tools | Options and locate the template under 'sA&Pm
* the Source Creation and Management node. Right-click the template and choose djSN{>S
* Open. You can then make changes to the template in the Source Editor. Olno9_'
*/ 4/h2_
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package com.tot.count; t]` 2f3UO
import java.util.*; jNyC%$
/** .Yf
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* .U1dcL6
* @author fC-^[Af)
*/ p;5WLAF
public class CountCache { b9YpUm7#
public static LinkedList list=new LinkedList(); D3K`b4YV
/** Creates a new instance of CountCache */ 6
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public CountCache() {} JxvwquI
public static void add(CountBean cb){ tS9m8(Hr%Q
if(cb!=null){
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list.add(cb); H,I}R
} z=fag'fzM
} -?]ltn9!
} 9F-k:hD |
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CountControl.java ;+jp,( 7
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/* E??%)q
* CountThread.java C=]3NB>Jc
* FjydEV
* Created on 2007年1月1日, 下午4:57 #<~f~{x
* F9<OKcXH
* To change this template, choose Tools | Options and locate the template under Ya_6Zd4O
* the Source Creation and Management node. Right-click the template and choose [x)e6p)
* Open. You can then make changes to the template in the Source Editor. OMZT\$9yT
*/ 4tC_W!?$t
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package com.tot.count; N<{`n;
import tot.db.DBUtils; BmM,vllO
import java.sql.*; esHiWHAC
/** x L BG}C
* |")x1'M
* @author `u}x:f !
*/ \1Bgs^
public class CountControl{ $W?XxgkB?
private static long lastExecuteTime=0;//上次更新时间 Y/^<t'o&
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 n>4S P_[E7
/** Creates a new instance of CountThread */ @Dy.HQ~
public CountControl() {} ;FmSL#]I
public synchronized void executeUpdate(){ wY95|QS
Connection conn=null; d"78:+
PreparedStatement ps=null; "tR.'F[n4P
try{ zb" hy"hKw
conn = DBUtils.getConnection(); Qx6/QaS?
conn.setAutoCommit(false); K$.zO4
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); moR]{2Cd{
for(int i=0;i<CountCache.list.size();i++){ vh HMxOZ;
CountBean cb=(CountBean)CountCache.list.getFirst(); n1t(ns|
CountCache.list.removeFirst(); yRYWx` G
ps.setInt(1, cb.getCountId()); s]N-n?'G"
ps.executeUpdate();⑴ j[fQs,efK
//ps.addBatch();⑵ 3wE8y&
} -b$OHFL
//int [] counts = ps.executeBatch();⑶ Q#N+5<]J)#
conn.commit(); X\x9CA
}catch(Exception e){ /kz&9FM
e.printStackTrace(); d.AjH9 jg
} finally{ [z~Nw#
try{ K[[k,W]qb
if(ps!=null) { OeYLL4H
ps.clearParameters(); @NIypi$T
ps.close(); T]W -g
ps=null; uI2'jEjO
} MT`gr
}catch(SQLException e){} (HI%C@e9
DBUtils.closeConnection(conn); _Pkh`}W:
} p5l$On
} Dkb&/k:)
public long getLast(){ bw\=F_>L
return lastExecuteTime; (Pd>*G\
} =M5M;
public void run(){ P1wRt5
long now = System.currentTimeMillis(); H1nQ.P]_
if ((now - lastExecuteTime) > executeSep) { vR$5ItnT
//System.out.print("lastExecuteTime:"+lastExecuteTime); &w0=/G/T=~
//System.out.print(" now:"+now+"\n"); ak>NKK8P
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); 1 =<|h
lastExecuteTime=now; ,*[LnR
executeUpdate(); Z-|C{1}A
} \DqxS=o;
else{ vI'>$
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); p]&Q`oh
} CK(ev*@\D,
} ?6d4T
} _|ib@Xbin
//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 =LxmzQO#
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类写好了,下面是在JSP中如下调用。 a1SOC=.M;
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<% $0}bi:7
CountBean cb=new CountBean(); rbPs~C-[
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); H4NEB1TO>
CountCache.add(cb); }yw;L(3
out.print(CountCache.list.size()+"<br>"); 9/Dt:R3QU
CountControl c=new CountControl(); # &83;uys
c.run(); .,Qnn}:l
out.print(CountCache.list.size()+"<br>"); ^gzNP#A<'o
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