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JSP高访问量下的计数程序

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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: o3=pxU*  
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  CountBean.java _mc-CZ  
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/* 1 paLxR5  
* CountData.java b .|k j  
* 6w)a.^yx7  
* Created on 2007年1月1日, 下午4:44 xSy`VuSl  
* P:&X1MC  
* To change this template, choose Tools | Options and locate the template under Bw25+l Px  
* the Source Creation and Management node. Right-click the template and choose ="J *v>  
* Open. You can then make changes to the template in the Source Editor. YML]pNB  
*/ a(oa?OdJ  
u4vyj#V  
  package com.tot.count; 1V:I }~\  
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/** v,^W& W.  
* |Q?^Ba  
* @author XDohfa _  
*/ N`et]'_A}  
public class CountBean { ce:p*  
 private String countType; "kd)dy95H  
 int countId; " `FcW  
 /** Creates a new instance of CountData */ zy(NJ  
 public CountBean() {} TP{2q51yM  
 public void setCountType(String countTypes){ B"?ivxM:U  
  this.countType=countTypes; p(Ux]_s%  
 } +o-jMvK9  
 public void setCountId(int countIds){ ???`BF[|  
  this.countId=countIds; +^|_vq^XR  
 } Lv UQ&NmY  
 public String getCountType(){ T7~H|%  
  return countType; @L?KcGD  
 } '8w>=9Xl  
 public int getCountId(){ AX;!-|bW  
  return countId; )9i$ 1"a(  
 } MUn(ZnQy|  
} z}w7X6&e  
#pcgfVl  
  CountCache.java `IV7\}I|  
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/* )k.}>0K |  
* CountCache.java 5XoM)  
* 5y8VA4L/o  
* Created on 2007年1月1日, 下午5:01 c*.-mS~Z`  
*  D9h  
* To change this template, choose Tools | Options and locate the template under yQ0:M/r;0  
* the Source Creation and Management node. Right-click the template and choose Q@KCODi  
* Open. You can then make changes to the template in the Source Editor. we8aqEomr  
*/ 7zq@T]  
"fu:hHq  
package com.tot.count; fPPC`d&Q3  
import java.util.*; 4i7+'F  
/** qWM+!f  
* 5Mz:$5Tm  
* @author N@0cn q:"  
*/ c{ ([U  
public class CountCache { rXP~k]tC  
 public static LinkedList list=new LinkedList(); CorV!H4  
 /** Creates a new instance of CountCache */ T>68 ,; p  
 public CountCache() {} Bmt^*;WY+  
 public static void add(CountBean cb){ PdtL Cgd  
  if(cb!=null){ -}_1f[b  
   list.add(cb); $C{,`{=  
  } pO92cGJ8  
 } R,ZG?/#uM9  
} k(he<-GF\  
jn(%v]  
 CountControl.java F1meftK  
9y&bKB2,  
 /* J6Vx7  
 * CountThread.java _"*}8{|  
 * 6H=gura&   
 * Created on 2007年1月1日, 下午4:57 0X3yfrim  
 * \PWH( E9  
 * To change this template, choose Tools | Options and locate the template under ;y_]w6|n  
 * the Source Creation and Management node. Right-click the template and choose 0SDnMij&bf  
 * Open. You can then make changes to the template in the Source Editor. # %EHcgF  
 */ 4Cv*zn  
(x fN=Te,-  
package com.tot.count; ``%yVVg}  
import tot.db.DBUtils; T'{9!By,P  
import java.sql.*; k/(]1QnW  
/** w2db=9  
* Ol~M BQs  
* @author  TJ1h[  
*/ Wy%FF\D.Y  
public class CountControl{ >n^780S|  
 private static long lastExecuteTime=0;//上次更新时间  C;j& Vbf  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 stUUez>  
 /** Creates a new instance of CountThread */ &d0sv5&s  
 public CountControl() {} $,yAOaa  
 public synchronized void executeUpdate(){ YS_3Cq  
  Connection conn=null; 2vWn(6`  
  PreparedStatement ps=null; ?}uuTNLl)  
  try{ h aApw(.%  
   conn = DBUtils.getConnection(); NBHpM}1xtU  
   conn.setAutoCommit(false); yzv"sd[8N  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); 1je j7p>K  
   for(int i=0;i<CountCache.list.size();i++){ `nKN|6o#x  
    CountBean cb=(CountBean)CountCache.list.getFirst(); )U=]HpuzI  
    CountCache.list.removeFirst(); ]IEZ?+F,  
    ps.setInt(1, cb.getCountId()); <z\`Ma  
    ps.executeUpdate();⑴ z;!"i~fFK  
    //ps.addBatch();⑵ rtfRA<  
   } s&Y"a,|Z  
   //int [] counts = ps.executeBatch();⑶ K8R>O *~  
   conn.commit(); vd)zvI  
  }catch(Exception e){ Q;J( 5;  
   e.printStackTrace(); S*$?~4{R  
  } finally{ zCuB+r=C  
  try{ fjOq@thD  
   if(ps!=null) { SiUu**zC  
    ps.clearParameters(); $rI 1|;^  
ps.close(); Fn7OmxfD  
ps=null; vFB^h1k~.M  
  } ZP5 !O[Ut  
 }catch(SQLException e){} JJM<ywPGp  
 DBUtils.closeConnection(conn); Px&_6}YWy  
 } 1I{8 |  
} "i\#L`TkzX  
public long getLast(){ g4 eW<  
 return lastExecuteTime; 3 ye  
} 9 @xl{S-  
public void run(){ z}B 39L  
 long now = System.currentTimeMillis(); J|].h  
 if ((now - lastExecuteTime) > executeSep) { ?*%_:fB  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); ( *Xn"o  
  //System.out.print(" now:"+now+"\n"); A4cOnG,  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); HA*L*:0  
  lastExecuteTime=now; ^:]$m;v]  
  executeUpdate(); p |1u,N  
 } h='F,r5#2  
 else{ # )y/aA  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); " X8jpg  
 } c~?Zmdn:  
} r`.N?  
} o$buoGSPc  
//注:如果你的数据库驱动支持批处理,那么可以将⑵,⑶标记的代码前的注释去掉,同时在代码⑴前加上注释  +l/v`=C  
{BT/P!  
  类写好了,下面是在JSP中如下调用。 :Ys~Lt54  
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<% l6&\~Z(  
CountBean cb=new CountBean(); EgU#r@7I  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); JD~;.3$/k  
CountCache.add(cb); ,_fz)@)  
out.print(CountCache.list.size()+"<br>"); "GZi eI D  
CountControl c=new CountControl(); a9z#l}IQ  
c.run(); m^G(qoZ]  
out.print(CountCache.list.size()+"<br>"); P0jr>j@^-  
%>
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