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: !Nxn[^[?.
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CountBean.java ?Str*XA;
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/* ?4,*RCaI
* CountData.java ~q]|pD"\K|
* :af;yu
* Created on 2007年1月1日, 下午4:44 "U5Ln2X{J
* hNq8
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* To change this template, choose Tools | Options and locate the template under [>M*_1F
* the Source Creation and Management node. Right-click the template and choose [,o5QH\Etq
* Open. You can then make changes to the template in the Source Editor. v1X&p\[d
*/ r@ T-Hi
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package com.tot.count; rm)SfT<
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/** T?]kF-
* 10l1a4
* @author QC\g%MVG
*/ rPo\Dz
public class CountBean { TA@tRGP>
private String countType; ) (?UA$"
int countId; H ?=pWB
/** Creates a new instance of CountData */ '[=yfh
public CountBean() {} srChY&h?<
public void setCountType(String countTypes){ ll<9f)
this.countType=countTypes; z7t'6Fy9'
} ;oY(I7
public void setCountId(int countIds){ =N@)CB7a
this.countId=countIds; L`HH);Ozw
} BudWbZ5>Ep
public String getCountType(){ Fyh?4!/.
return countType; T)Zt'M
} yjOu]K:X
public int getCountId(){
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return countId; kh>SrW]B%
} '!yS72{$2
} g@k#J"Q'[
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CountCache.java vU8FHVytV
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/* 6L:trLuQ
* CountCache.java }4\!7]FVYX
* \%-E"[!
* Created on 2007年1月1日, 下午5:01 C$'D]fX
* fZw9zqg
* To change this template, choose Tools | Options and locate the template under z3vsz
* the Source Creation and Management node. Right-click the template and choose oXQ<9t1(
* Open. You can then make changes to the template in the Source Editor. x#:BE
*/ M ~ i+F0
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package com.tot.count; k binf
import java.util.*; :p\(y
/** /+x#V!zM
* wzDk{4U
* @author 6HEqm>Yau
*/ Ha=_u+@
public class CountCache { d Y:|Ef|v(
public static LinkedList list=new LinkedList(); }:RT,<
/** Creates a new instance of CountCache */ %EJ\|@N:
public CountCache() {}
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public static void add(CountBean cb){ c4ZuW_&:
if(cb!=null){ T<TcV9vM
list.add(cb); ~|r'2V*
} O ':0V
} ~$&:NB1~q
} $KwI}>E4
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CountControl.java LL= Z$U
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/* #K:-Bys5v
* CountThread.java $S6HZG:N
* }XGMa?WR
* Created on 2007年1月1日, 下午4:57 Z{,GZT
* 3wN?|N
* To change this template, choose Tools | Options and locate the template under Yo~LckFF
* the Source Creation and Management node. Right-click the template and choose "wnpiB}
* Open. You can then make changes to the template in the Source Editor. }pl]9
*/ T}L^CU0
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package com.tot.count; 7K>D@O
import tot.db.DBUtils; E[|s>Xv~
import java.sql.*; %]a
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/** k#axt
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* nabBU4;h
* @author 99l>CYXd
*/ v"P&`1=T
public class CountControl{ Pl rkgS0J
private static long lastExecuteTime=0;//上次更新时间 _pz,okO[V
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 K0EY<Ltq
/** Creates a new instance of CountThread */ ]6$,IKE7
public CountControl() {} KGV.S
public synchronized void executeUpdate(){ 54q4CagFq
Connection conn=null; H&w:`JYDL3
PreparedStatement ps=null; V=j-Um;
try{ GBH_r0
conn = DBUtils.getConnection(); K3vseor
conn.setAutoCommit(false); =jg#fdM
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ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); ..t,LU@|
for(int i=0;i<CountCache.list.size();i++){ 0>,.c2),
CountBean cb=(CountBean)CountCache.list.getFirst(); Vq3gceo'0A
CountCache.list.removeFirst(); }xAie(
ps.setInt(1, cb.getCountId()); N$\ bg|v
ps.executeUpdate();⑴ [>W"R1/
//ps.addBatch();⑵ KQG-2oW
} EMVk:Vt]
//int [] counts = ps.executeBatch();⑶ 1R0ffP]
conn.commit(); r\$6'+Si
}catch(Exception e){ w)+wj[6
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e.printStackTrace(); A6Ghj{~
} finally{ =N YgGEFq.
try{ QGs1zfh*
if(ps!=null) { T>}0) s
ps.clearParameters(); z$JX'(<Z7
ps.close(); +hE',i.
ps=null; aq3~!T;W
} {Ge+O<mD
}catch(SQLException e){} 2\^G['9
DBUtils.closeConnection(conn); @Ii-NmOr
} HXQ e\r
} :P3{Nxa
public long getLast(){ +c^_^Z$_4o
return lastExecuteTime; 4p.^'2m
} PG{i,xq_B{
public void run(){ ?b||Cr
long now = System.currentTimeMillis(); >Bc>IO
if ((now - lastExecuteTime) > executeSep) { D`6iDit
//System.out.print("lastExecuteTime:"+lastExecuteTime); s}6+8 fE"
//System.out.print(" now:"+now+"\n"); ze`1fO|%
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); n[!;yO
lastExecuteTime=now; ;Vg^!]LL#
executeUpdate(); 1EVfowIl
} \)ip>{WG
else{ =96G8hlT
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); `E@kFJ(<On
} 8wr8:(Y$
} \gLxC
} aF!E x
//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 b"I~_CL|
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类写好了,下面是在JSP中如下调用。 >lrhHU
8zY)J #
<% .*BA 1sjE
CountBean cb=new CountBean(); 3KSpB;HX
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); B$rTwR"(-
CountCache.add(cb); s f(iE(o
out.print(CountCache.list.size()+"<br>"); PgMbMH
CountControl c=new CountControl(); z~,mRgc$B
c.run(); [ `7%sn]$
out.print(CountCache.list.size()+"<br>"); 3UdU"d[75
%>