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: 9\R:J"X
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CountBean.java FFK79e/5
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/* vA;ml$
* CountData.java !ck=\3pr
* Y}(v[QGV
* Created on 2007年1月1日, 下午4:44 6V*@
{
* 4US8B=jk
* To change this template, choose Tools | Options and locate the template under V0c*M>V
* the Source Creation and Management node. Right-click the template and choose 3)EslBA7i
* Open. You can then make changes to the template in the Source Editor. v^HDR 3I
*/ ?K|PM<A
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package com.tot.count; }i|o":-x+
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/** < 5;0LPU
* UN_lK<utF
* @author FavU"QU&|
*/ n|yl3v
public class CountBean { 1Jd82N\'
private String countType; Pb+oV
int countId; "7l p|0I
/** Creates a new instance of CountData */ q'hMf?_
public CountBean() {} *8kg6v%
public void setCountType(String countTypes){ 4~ZQsw`
this.countType=countTypes; #W~5M ?+
} /n/U)!tp
public void setCountId(int countIds){ W6E9
this.countId=countIds; f/eT4y
} 0{gvd"q
public String getCountType(){ v>~ottQ|
return countType; lk2F]@_kJH
} vXq=f:y4
public int getCountId(){ PF1!aAvVb
return countId; Kg~<h B6
} rcF;Lp :
} 3k5Mty
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CountCache.java F2AM/m^!q
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/* J,4]du$
* CountCache.java |.*),t3
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* gmj
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* Created on 2007年1月1日, 下午5:01 c zL[W2l
* zVGjXuNa
* To change this template, choose Tools | Options and locate the template under 42Tjbten_u
* the Source Creation and Management node. Right-click the template and choose zi:GvTG
* Open. You can then make changes to the template in the Source Editor. \G#Qe*"'K
*/ #-
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package com.tot.count; (|bMtT?"x
import java.util.*; }rn}r4_a
/** Kbg`ZO*
* y@nWa\iG
* @author |pqLwnOu
*/ VahR nD
public class CountCache { Ty*ec%U9F
public static LinkedList list=new LinkedList(); E@JxY
/** Creates a new instance of CountCache */ GWM2l?zOP
public CountCache() {} 'R*xg2!i
public static void add(CountBean cb){ nAoGG0$5
if(cb!=null){ \&&kUpI
list.add(cb); 23_<u]V
} c^6v7wT5
} e,Gv~ae9
} G"5Nj3vd
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CountControl.java Y
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/* t TA6 p
* CountThread.java XG<^j}H{}
* HdJLD+k/
* Created on 2007年1月1日, 下午4:57 -,TBUWg
* m{JiF-=u
* To change this template, choose Tools | Options and locate the template under Bag2sk
* the Source Creation and Management node. Right-click the template and choose e%R+IH5i
* Open. You can then make changes to the template in the Source Editor. f`:e#x
*/ prlB9,3|C
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package com.tot.count; /raM\EyrlP
import tot.db.DBUtils; = EyxM
import java.sql.*; 1_fFbb"
/** ngsax1xO
* it&c
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* @author Wey-nsk
*/ o*qEAy?
public class CountControl{ FT[oM<M\Xd
private static long lastExecuteTime=0;//上次更新时间 0s$g[Fw<.
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 V*=cNj
/** Creates a new instance of CountThread */ yD#w @yG
public CountControl() {} { )'D<:T
public synchronized void executeUpdate(){ d#ya"e>
Connection conn=null; 0Y)b319B
PreparedStatement ps=null; U"%k4]:A
try{ pvI(hjMYPk
conn = DBUtils.getConnection(); Uf4QQ`c#
conn.setAutoCommit(false); ?OZbns~
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); S4qh8c
for(int i=0;i<CountCache.list.size();i++){ O .TFV.
CountBean cb=(CountBean)CountCache.list.getFirst(); ]N!SG@X+
CountCache.list.removeFirst(); 7Kk rfJqN
ps.setInt(1, cb.getCountId()); }h+a8@
ps.executeUpdate();⑴ i_`YZ7Hxp
//ps.addBatch();⑵ DECX18D
} /v5Pk.!o
//int [] counts = ps.executeBatch();⑶ 7KRc^ *pZs
conn.commit(); ~e
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}catch(Exception e){ O.&6J/
e.printStackTrace(); yZ0; \Tr*J
} finally{ r;|Bc$P
try{ ~1|sf8
if(ps!=null) { C;dA?Es>R
ps.clearParameters(); sx*1D9s_
ps.close(); Jgtvia
ps=null; 2mu~hJ
} AN^ ,
}catch(SQLException e){} ])m",8d&T
DBUtils.closeConnection(conn); Ef%8+_
} iN`/pW/JE
} EOtrrfT&
public long getLast(){ Pk8L-[&v
return lastExecuteTime; u%XFFt5
} @]3(l
public void run(){ nXi6Q+YI
long now = System.currentTimeMillis(); }K<;ygcWE@
if ((now - lastExecuteTime) > executeSep) { *n}9_V%
//System.out.print("lastExecuteTime:"+lastExecuteTime); *XniF~M
//System.out.print(" now:"+now+"\n"); qgI
Jg6x/}
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ;jX_e(T3m
lastExecuteTime=now; =!#DUfQf
executeUpdate(); aI8wy-3 I
} %(6f
else{ mKe{y.
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Ic#+*W\ZW
} /rvXCA)j
} t$l[ 4
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} Kw!`u^>
//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 <R GRvv
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类写好了,下面是在JSP中如下调用。 /R|"/B0
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<% R)<Fqa7Tm
CountBean cb=new CountBean(); !~ -^s
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); x-tA{_:
CountCache.add(cb); v|{*y
out.print(CountCache.list.size()+"<br>"); Dcus-,u~
CountControl c=new CountControl(); f\r$T Nd6
c.run(); g:[&]o} :9
out.print(CountCache.list.size()+"<br>"); 6Otv[8^}
%>