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: ;h-G3>Il
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CountBean.java 0(9I\j5`TT
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/* {7TJgS
* CountData.java >b4YbLkI#
* Sa[EnC
* Created on 2007年1月1日, 下午4:44 =>:% n
* C`)^~C_]`3
* To change this template, choose Tools | Options and locate the template under N
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* the Source Creation and Management node. Right-click the template and choose P96Cw~<Q?
* Open. You can then make changes to the template in the Source Editor. >|_gT%]5
*/ y13CR2t6
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package com.tot.count; F`;TU"pDf
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/** _yxe2[TD
* f`u5\!}=!
* @author XgiI6-B~
*/ lNh=>DPu
public class CountBean { ]*g ss'N
private String countType; A|
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int countId; !8
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/** Creates a new instance of CountData */ SA`J.4yn
public CountBean() {} } `>J6y9
public void setCountType(String countTypes){ lrmt)BLoh
this.countType=countTypes; !X\sQNp
} 0{"dI;b%
public void setCountId(int countIds){ } Jdh^t .
this.countId=countIds; yRq8;@YGY
}
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public String getCountType(){ AF*ni~
return countType; Lt;.Nw
} oz\{9Lwc
public int getCountId(){ 1F3QI|
return countId; M 5T=Fj86
} :\1rQT
} 2\nBqCxR
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CountCache.java 9LqMQv"xW
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/* 8g#
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* CountCache.java c6?c>*z
* F;d%@E_Bc
* Created on 2007年1月1日, 下午5:01 .`p<hA)%[C
* CzzUi]*Ac{
* To change this template, choose Tools | Options and locate the template under w|
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* the Source Creation and Management node. Right-click the template and choose lnS\5J
* Open. You can then make changes to the template in the Source Editor. Eo7 _v
*/ oN&rq6eN
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package com.tot.count; `r~`N`o5A
import java.util.*; _:ZFCDO
/** E !Oz|q
* Z9J =vzsHE
* @author ~zE 1'
*/ *c~'0|r
public class CountCache { KD,^*FkkL
public static LinkedList list=new LinkedList(); AMh37Xo
/** Creates a new instance of CountCache */ r%Q8)nEo
public CountCache() {} .\ ;l-U
public static void add(CountBean cb){ f7_\).T
if(cb!=null){ L;.VEz!
list.add(cb); -A~;MGY
} Z%Tq1O
} a!c/5)v(
} eEW roF
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CountControl.java E(aX4^]g
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/* 7X9+Qj;
* CountThread.java $I)Tk`=
* V!pq,!C$v
* Created on 2007年1月1日, 下午4:57 gD,YQ%aq
* oglXW8
* To change this template, choose Tools | Options and locate the template under ]/aRc=Gn
* the Source Creation and Management node. Right-click the template and choose "fX_gN?
* Open. You can then make changes to the template in the Source Editor. ;_?zB NW
*/ x"(7t3xK
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package com.tot.count; mC*W2#1pF
import tot.db.DBUtils; S F&M
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import java.sql.*; p<of<YU)
/** ESC
* ql{^"8x
* @author =R8f)UQYx
*/ (ZE%tbm2
public class CountControl{ CbTf"pl
private static long lastExecuteTime=0;//上次更新时间 Qag|nLoT
private static long executeSep=60000;//定义更新间隔时间,单位毫秒 ;x!,g5q"q
/** Creates a new instance of CountThread */ Z-4K?;g'k
public CountControl() {} X;s3y{ku
public synchronized void executeUpdate(){ t/v@vJ`vSH
Connection conn=null; ~=`f]IL
PreparedStatement ps=null; =,&u_>Dp
try{ G]L0eV
conn = DBUtils.getConnection(); ) >>u|#@z
conn.setAutoCommit(false); 92P,:2`a
ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 3n.+_ jQ>s
for(int i=0;i<CountCache.list.size();i++){ th.M.jas
CountBean cb=(CountBean)CountCache.list.getFirst(); k1^V?O
CountCache.list.removeFirst(); S`pF7[%rp
ps.setInt(1, cb.getCountId()); !6XvvTs/<
ps.executeUpdate();⑴ t Y:G54d=_
//ps.addBatch();⑵ hrJ$%U
} +L`V[;
//int [] counts = ps.executeBatch();⑶ B8bvp:Ho|
conn.commit(); iyA*JCD
}catch(Exception e){ 4/*]`
e.printStackTrace(); Ep^B,;~
} finally{ Kwy1SyU
try{ W9
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if(ps!=null) { ~fyF&+ibp'
ps.clearParameters(); ]}nu9z<
ps.close(); v
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ps=null; EHH|4;P6
} oS[W*\7'!
}catch(SQLException e){} |RHO+J
DBUtils.closeConnection(conn); H/cs_i
} EsT0"{
} ggrI>vaw
public long getLast(){ j G+T.
return lastExecuteTime; R19'|TJ
} qJ\X~5{
public void run(){ Z7`5x
long now = System.currentTimeMillis(); 8pXfT%]
if ((now - lastExecuteTime) > executeSep) { mBw2
//System.out.print("lastExecuteTime:"+lastExecuteTime); umJay/>
//System.out.print(" now:"+now+"\n"); M.o?CX'
// System.out.print(" sep="+(now - lastExecuteTime)+"\n"); ,$HHaoog
lastExecuteTime=now; {@Blj3 ;w}
executeUpdate(); X }m7@r@
} '9^E8+=|
else{ }R`8h&J
//System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); zXj>K3M
} dj?G.-
} V8-4>H}Cb/
} YH6snC$u
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释 H"2 U)HJl
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类写好了,下面是在JSP中如下调用。 +ckMT3
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<% 08`f7[JQo]
CountBean cb=new CountBean(); ?+3R^%`V
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); \U==f&G?J
CountCache.add(cb); =ft9T&ciD
out.print(CountCache.list.size()+"<br>"); \V._Z>]
CountControl c=new CountControl(); 9 1BY]N
c.run(); `ffj8U
out.print(CountCache.list.size()+"<br>"); Z$Z`@&U=
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