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: _Ub
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CountBean.java ls@]%pz.1d
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/* U7s$';y"%
* CountData.java O{X~,Em=q
* W r/-{Wt
* Created on 2007年1月1日, 下午4:44 lv
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* _HUbE /
* To change this template, choose Tools | Options and locate the template under C[^V\?3ly:
* the Source Creation and Management node. Right-click the template and choose /IpCo
* Open. You can then make changes to the template in the Source Editor. ;>?h/tS6
*/ Ki;SONSV~|
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package com.tot.count; /WTEz\k
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/** "Q.*
* R_PF*q2 '
* @author 5Kg'&B (
*/ @oA z
public class CountBean { SB\%"nnV
private String countType; jn2=)KBa_
int countId; A"V
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/** Creates a new instance of CountData */ >7>I1
public CountBean() {} 'Z`7/I4&
public void setCountType(String countTypes){ y"JR kJ
this.countType=countTypes; <>3)S`C`p
} 7QsD"rL
public void setCountId(int countIds){ TQ4@|S:OF
this.countId=countIds; {6'Xz
} Z4] n<~o
public String getCountType(){ }g}Eh>U
return countType; 5}#wp4U
} ,S-h~x
public int getCountId(){ w"^h<]b
return countId; 9"P|Csj
} dVQ[@u1,
}
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CountCache.java ]Ox5F@
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/* UD.bb
* CountCache.java r`O
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* 0*$w(*
* Created on 2007年1月1日, 下午5:01 ?%s>a8w
* x}] 56f
* To change this template, choose Tools | Options and locate the template under BN_h3|)
* the Source Creation and Management node. Right-click the template and choose |9I)YD
* Open. You can then make changes to the template in the Source Editor. [oLV,O|s|j
*/ ^ po@U"
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package com.tot.count; "%-Vrb=:Y
import java.util.*; wX,V:QE
/** <g[z jV9p
* %nZl`<M
* @author Z?axrGmg0
*/ hS]w
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public class CountCache { ?E([Nc0T
public static LinkedList list=new LinkedList(); |YJ83nSO~
/** Creates a new instance of CountCache */ JVE\{ e)
public CountCache() {} & LE5'.s
public static void add(CountBean cb){ &R94xh%@(
if(cb!=null){ &|hK79D
list.add(cb); I%[e6qX@
} "`vRHeCKN
} !/zRw-q3B
} *M.xVUPr
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CountControl.java j6rN t|
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/* >fPo_@O
* CountThread.java QZ a.c
* pO`KtagL
* Created on 2007年1月1日, 下午4:57 X]0>0=^
* <L&EH@T
* To change this template, choose Tools | Options and locate the template under *DL7p8
* the Source Creation and Management node. Right-click the template and choose ScPVjqG2{
* Open. You can then make changes to the template in the Source Editor. v,KKn\X
*/ AJPvwu}D
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package com.tot.count; b9.M'P\
import tot.db.DBUtils; 5~*)3z^V
import java.sql.*; pCIzpEsRs
/** %$!3Pbui
* COrk (V
* @author Rr)+M3'
*/ Jz@~$L
public class CountControl{ ?8b19DMK6
private static long lastExecuteTime=0;//上次更新时间 !|cg=
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 GtA`0B
/** Creates a new instance of CountThread */ h!EA;2yGKa
public CountControl() {} +EETo):
public synchronized void executeUpdate(){ FcDS*ZEk!
Connection conn=null; 4.RQ3SoDa
PreparedStatement ps=null; zKJ2~=
try{ .|UQ)J?s
conn = DBUtils.getConnection(); {Cx5m
conn.setAutoCommit(false); xUo6~9s7
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); k:@DK9
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for(int i=0;i<CountCache.list.size();i++){ +a1x;
CountBean cb=(CountBean)CountCache.list.getFirst(); Cm}2 >eH
CountCache.list.removeFirst(); OmYVJt_
ps.setInt(1, cb.getCountId()); +{J8,^z#
ps.executeUpdate();⑴ )-C3z
//ps.addBatch();⑵ 0'QWa{dS\
} P15
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//int [] counts = ps.executeBatch();⑶ CD|[PkjW
conn.commit(); "LMj,qZ1!
}catch(Exception e){ %`Re{%1;
e.printStackTrace(); 4fEDg{T
} finally{ }cKB)N
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try{ pfA6?tP`
if(ps!=null) { zw0w."V
ps.clearParameters(); XX6Z|Y5.
ps.close(); "t@p9>
ps=null; ZCiCZ)oc
} !rvEo =^
}catch(SQLException e){} ^J!q>KJs
DBUtils.closeConnection(conn); bx@l6bpQ
} {T){!UVp!
} UO/sv2CN
public long getLast(){ N##`
return lastExecuteTime; B/?
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} ?pDr"XH~
public void run(){ PnlI {d
long now = System.currentTimeMillis(); d=!:UB
if ((now - lastExecuteTime) > executeSep) { Cy/&KWLenf
//System.out.print("lastExecuteTime:"+lastExecuteTime); U|(+-R8Z
//System.out.print(" now:"+now+"\n"); d0cL9&~qW
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Qzi?%&
lastExecuteTime=now; Szu s*YL7
executeUpdate(); /7Q|D sa
} %u -x9
else{ I.2J-pu}
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); |{ jT+
} Jd2.j?P=
} s27IeF3
} hsZ/Vnn`
//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
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类写好了,下面是在JSP中如下调用。 \bA Yic
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<% 9>""xt
CountBean cb=new CountBean(); 6_LeP9s )
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); 2Xb,
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CountCache.add(cb); 6%D9;-N)
out.print(CountCache.list.size()+"<br>"); "
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CountControl c=new CountControl(); p{FI_6db
c.run(); Bf_$BCyGW
out.print(CountCache.list.size()+"<br>"); q}1ZuK`6
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