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: &Pt|
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CountBean.java cHK)e2r
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/* p}.P^`~j
* CountData.java IS7g{:}=p
* DLE|ctzj[7
* Created on 2007年1月1日, 下午4:44 Kp"mV=RG2T
* zMX7 #,
* To change this template, choose Tools | Options and locate the template under !TY4C`/
* the Source Creation and Management node. Right-click the template and choose \s;]Tg
* Open. You can then make changes to the template in the Source Editor. y]=v+Q*+
*/ ~az6n)
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package com.tot.count; ?PWD[mQE\
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/** 9QJ=?bIC#
* b@N|sXt&C
* @author K&"Yv~h
*/ `Oys&]vb
public class CountBean { 1W-t})!a
private String countType; cWgiFv
int countId; 9A\J*OU
/** Creates a new instance of CountData */ VS^%PM#:/
public CountBean() {} ,*0>CBJvv
public void setCountType(String countTypes){ xk86?2b{)
this.countType=countTypes; mKZ?H$E%%
} O7j$bxk/^
public void setCountId(int countIds){ J{$C}8V
this.countId=countIds; !.L%kw7z
} 5L|yF"TI#
public String getCountType(){ qB@]$
return countType; }.gDaxj
} ;: Hfkyy]
public int getCountId(){ {a_=4a
return countId; z>k6 T4(
} H7"I+qE-G
} _h_;nS.Y
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CountCache.java T~ Jl{(s9)
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/* [?W3XUJ,Y
* CountCache.java x{ ~-YzWho
* 5gI@~h S
* Created on 2007年1月1日, 下午5:01 xpFu$2T6P.
* e }/c`7M
* To change this template, choose Tools | Options and locate the template under UuT>qWxQ8
* the Source Creation and Management node. Right-click the template and choose
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* Open. You can then make changes to the template in the Source Editor. {^9,Dy_D
*/ PK3)M'[
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package com.tot.count; 2DTH|Yv
import java.util.*; )rhKWg
/** dz5bW>
* -J!F((jt
* @author ]*juF[r(
*/ 4_PMl6qo
public class CountCache { D8h?s
public static LinkedList list=new LinkedList(); }<FBcc(n
/** Creates a new instance of CountCache */ Qo?"hgjlqm
public CountCache() {} (0D0G-r:
public static void add(CountBean cb){ *|$s0ga C
if(cb!=null){ |kV,B_qz
list.add(cb); (h/v"dV;
} e@k
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} -sO EL{
} ]9zc[_
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CountControl.java `Lm
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/* 4OCz:t
* CountThread.java LLgN%!&
* ,0<|&D
* Created on 2007年1月1日, 下午4:57 QEUg=*3W=
* }5OlX
* To change this template, choose Tools | Options and locate the template under Podm 3b
* the Source Creation and Management node. Right-click the template and choose + qpD>5#
* Open. You can then make changes to the template in the Source Editor. ~ ;)@a
*/ $g#X9/+<
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package com.tot.count; jc;&g)Rv
import tot.db.DBUtils; !SiZA"
import java.sql.*; <6p{eGAQV
/** QwOQS
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* 6JRee[
* @author `ZV;Le'
*/ d^]wqn pf
public class CountControl{ QHMXQyr(
private static long lastExecuteTime=0;//上次更新时间 f(D?g
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ,X$S4>
/** Creates a new instance of CountThread */ yKZ~ ^
public CountControl() {} X,O&X
public synchronized void executeUpdate(){ R(pvUm&L
Connection conn=null; LfOGq%&
PreparedStatement ps=null; x"AYt:ewuc
try{ v .r$]O
conn = DBUtils.getConnection(); @H&Aj..
conn.setAutoCommit(false); b^Rg_,s
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); !6<2JNf
for(int i=0;i<CountCache.list.size();i++){ ^N Et{]x
CountBean cb=(CountBean)CountCache.list.getFirst(); ]o,) #/' $
CountCache.list.removeFirst(); aM? 7'8/
ps.setInt(1, cb.getCountId()); '-w G
ps.executeUpdate();⑴ J5J3%6I
//ps.addBatch();⑵ B+zq!+ HJ
} * +A!12s@
//int [] counts = ps.executeBatch();⑶ &??(EA3
conn.commit(); 5Odi\SJ&
}catch(Exception e){ ODv)-J
e.printStackTrace(); n6Q 3X
} finally{ cY\-e?`=4
try{ [`ttNW(_
if(ps!=null) { ,Hys9I
ps.clearParameters(); v%zI~g.L
ps.close(); _?q\tyf3
ps=null; ?A62VV51CN
} G-"#3{~2
}catch(SQLException e){} *#UDMoz<
DBUtils.closeConnection(conn); 0C3Yina9
*
} e5`{*g$i).
} A.WJ#1i}E
public long getLast(){ cO(|>&tJ
return lastExecuteTime; J=4S\0Z*
} f+<-Jc
public void run(){ 1RRvNZW
long now = System.currentTimeMillis(); [>"qOFCr#:
if ((now - lastExecuteTime) > executeSep) { #B+2qD>E
//System.out.print("lastExecuteTime:"+lastExecuteTime);
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//System.out.print(" now:"+now+"\n"); )-
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// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); Yl-09)7s
lastExecuteTime=now; 5r
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executeUpdate(); X*S|aNaLWW
} ",Q \A I
else{ !EpP-bq'*
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); Grjm9tbX}
} CUxSmN2[
} #+Vvf
} JvHJ*E
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 >b{%j8uM
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类写好了,下面是在JSP中如下调用。 :4Q_\'P
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<% b GwLfU
CountBean cb=new CountBean(); 0JNG\ARC
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); d6hWmZVC
CountCache.add(cb); P\N`E?lJL
out.print(CountCache.list.size()+"<br>"); g-*@I`k[
CountControl c=new CountControl(); 3QV|@5L`[
c.run(); .' .|s?s
out.print(CountCache.list.size()+"<br>"); >DbG$V<v'
%>