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: >_F&oA#
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CountBean.java Nc"h8p?
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/* X&p-Ge1>z
* CountData.java 3_ zI$Z
* } KMdfA
* Created on 2007年1月1日, 下午4:44 6@I7UL >
* TTOd0a
* To change this template, choose Tools | Options and locate the template under Q'|cOQX
* the Source Creation and Management node. Right-click the template and choose G*"N}M1)
* Open. You can then make changes to the template in the Source Editor. Hb]7>[L
*/ kb%W3c9HO
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package com.tot.count; +Nza@B d
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/** [9LYR3 p
* vuAAaKz
* @author g|+G(~=e|
*/ 17
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public class CountBean { ]&r/H17
private String countType; N{q'wep
int countId; -d[x09
/** Creates a new instance of CountData */ S`6'~g
public CountBean() {} n `n3[
public void setCountType(String countTypes){ 72{kig9c
this.countType=countTypes; NK4ven7/
} M"_XaVl
public void setCountId(int countIds){ 2i>xJMW
this.countId=countIds; T@RzY2tz
} @DUdgPA
public String getCountType(){ )0GnTB;5Z
return countType; O]PfQ
} tlcA\+%)
public int getCountId(){ XsR%_eT
return countId; +2?0]6EQ
} jOuv\$
} 4u(}eE
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CountCache.java 1L9^N
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/* W*s`1O >
* CountCache.java 4]+ ^K`
* 6F(yH4
* Created on 2007年1月1日, 下午5:01 7"[lWC!As5
* FVD}9ia
* To change this template, choose Tools | Options and locate the template under 6?a(@<k_
* the Source Creation and Management node. Right-click the template and choose YT3QwN9
* Open. You can then make changes to the template in the Source Editor. _Ng*K]0/E
*/ &x3"Rq_
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package com.tot.count; z`Q5J9_<cV
import java.util.*; PIr Uls0}
/** Q72wg~% w
* f,-|"_5;
* @author cPN7^*
*/ AnyFg)a<
public class CountCache { P! 3$RO
public static LinkedList list=new LinkedList(); 5m bs0GL
/** Creates a new instance of CountCache */ Ey n3Vv?v
public CountCache() {} ~::R+Lh(
public static void add(CountBean cb){ fwnpmuJ
if(cb!=null){ Sx ~_p3_5U
list.add(cb); RXof$2CZS
} pts}?
} cp2fDn
} HdLkof2i
7]^ }
CountControl.java I^wj7cFo5
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/* [@y=%\%R
* CountThread.java XnY}dsSO
* ]_=HC5"
* Created on 2007年1月1日, 下午4:57 c,-x}i0c
* 'LOqGpmVc
* To change this template, choose Tools | Options and locate the template under ^GAdl}
* the Source Creation and Management node. Right-click the template and choose oy`m:Xp
* Open. You can then make changes to the template in the Source Editor. g:6yvEu$ -
*/ ^&<*$Ai~
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package com.tot.count; c%U$qao=c+
import tot.db.DBUtils; 6vjB;uS[
import java.sql.*; N1Z8I:
/** |{jAMC0#
* I[`2MKh
* @author `kv$B3
*/ R P X`2zr
public class CountControl{ o"FX+17
private static long lastExecuteTime=0;//上次更新时间 v\k,,sI
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 }ri*e2y)
/** Creates a new instance of CountThread */ 2at?9{b
public CountControl() {} [.I,B tY+
public synchronized void executeUpdate(){ WV @Tm$r
Connection conn=null; $`Xx5Ts7
PreparedStatement ps=null; '-S&i{H
try{ LWL>hd
conn = DBUtils.getConnection(); P3yiJ|vP
conn.setAutoCommit(false); StDmJ]
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); dbuOiZ
for(int i=0;i<CountCache.list.size();i++){ &`Di cfD
CountBean cb=(CountBean)CountCache.list.getFirst(); ~76.S
CountCache.list.removeFirst(); C~;0A!@]Y
ps.setInt(1, cb.getCountId()); bsP;
ps.executeUpdate();⑴ ]~.J@ 1?
//ps.addBatch();⑵ 7gMtnwT
} KVcZ@0[S
//int [] counts = ps.executeBatch();⑶ CU;nrd "
conn.commit(); PJYA5"}W
}catch(Exception e){ OT&E)eR
e.printStackTrace(); M$W#Q\<*#r
} finally{ w.Vynb
try{ L@_">'pR
if(ps!=null) { &+j^{a
ps.clearParameters(); j>Z]J'P
ps.close(); >YBpB,WND
ps=null; `eWcp^|
} U&n>fXTHn
}catch(SQLException e){} %7evPiNB
DBUtils.closeConnection(conn); ?Bzi#Z
} tvOAN|+F
} ~0-764%
public long getLast(){ e]
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return lastExecuteTime; BR^J y<^F'
} Vrj1$NL%
public void run(){ iW}l[g8sw!
long now = System.currentTimeMillis(); J=X%
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if ((now - lastExecuteTime) > executeSep) { <VU4rk^=
//System.out.print("lastExecuteTime:"+lastExecuteTime); _0*>I1F~
//System.out.print(" now:"+now+"\n"); B-~&6D,
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); -k
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lastExecuteTime=now; =]QH78\3
executeUpdate(); 7Hl_[n|
} dn\F!
else{ 0Mu8ZVI{
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); o$ce1LO?|N
} KF_Wu}q
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} klJ[ {p
} 7F(F.ut
//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 n+qVT4o
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类写好了,下面是在JSP中如下调用。 E)O|16f|>
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<% 1 j12Qn@]
CountBean cb=new CountBean(); bez'[Y{
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); R5eB,FN
CountCache.add(cb); -t6R!ZI
out.print(CountCache.list.size()+"<br>"); p,iCM?[|
CountControl c=new CountControl(); q83~j`ZJ$
c.run(); 3rdfg
out.print(CountCache.list.size()+"<br>"); *sB-scD
%>