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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: dKQu  
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  CountBean.java w9w=2 *  
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/* ` 7P%muY.  
* CountData.java 9$#@Oe8*  
* P''>wjMH0  
* Created on 2007年1月1日, 下午4:44 %x-`Y[  
* d{Cg3v`Rd  
* To change this template, choose Tools | Options and locate the template under Oz4vV_a&'  
* the Source Creation and Management node. Right-click the template and choose ][dst@?8Oz  
* Open. You can then make changes to the template in the Source Editor. 6DG%pF,  
*/ "Q`Le{  
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  package com.tot.count; ZmDM=qN  
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/** L0)w~F ?m  
* l* z "wA-  
* @author nR=!S5>S  
*/ +bGO"*  
public class CountBean { PjP6^"  
 private String countType; jf.WmiDC  
 int countId; $|tk?Sps  
 /** Creates a new instance of CountData */ P=aYwmC  
 public CountBean() {} TbD $lx3>  
 public void setCountType(String countTypes){ d%K&  
  this.countType=countTypes; VXnWY8\  
 } D}`MY\H  
 public void setCountId(int countIds){ t2Px?S?  
  this.countId=countIds; t$3B#=  
 } wBJ|%mc3TA  
 public String getCountType(){ QM'|k6  
  return countType; \fsNI T/  
 } kX2Z@ w`  
 public int getCountId(){ yAFt|<  
  return countId; {%\@Z-9%q,  
 } *nK4XgD  
} lA` qB1x  
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  CountCache.java ,A5}HRW%  
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/* {9FL}Jrt  
* CountCache.java R7 rO7M !  
* =M6{{lI/  
* Created on 2007年1月1日, 下午5:01 "A*;V  
* '0=mV"#H{  
* To change this template, choose Tools | Options and locate the template under n?>|2>  
* the Source Creation and Management node. Right-click the template and choose {oS/Xa  
* Open. You can then make changes to the template in the Source Editor. qu\U^F  
*/ h$#PboLd  
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package com.tot.count; }5;/!P_A  
import java.util.*; Ng2Z7k  
/** XmP,3KG2{S  
* 8!b>[Nsc  
* @author 0#NbAMt  
*/ D~FIv  
public class CountCache { QUm[7<"  
 public static LinkedList list=new LinkedList();  ^Kl*}  
 /** Creates a new instance of CountCache */ j/jFS]iC  
 public CountCache() {} +k h Tl:  
 public static void add(CountBean cb){ P:WxhO/  
  if(cb!=null){ X f{9rZ+  
   list.add(cb); OnH3Ss$  
  } )gD2wk(  
 } K_n GZ/`[  
}  9I:3  
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 CountControl.java G?,"AA;  
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 /* AV4fN@BX  
 * CountThread.java +4p=a [  
 * ,|Gjr T{vf  
 * Created on 2007年1月1日, 下午4:57 [%P[ x]-  
 * f1S% p  
 * To change this template, choose Tools | Options and locate the template under B6j/"x6N15  
 * the Source Creation and Management node. Right-click the template and choose ]4r&Q4d>O  
 * Open. You can then make changes to the template in the Source Editor. Kf6 D)B 26  
 */ )W6l/  
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package com.tot.count; {6O} E9  
import tot.db.DBUtils; l$ kO%E'  
import java.sql.*; xSm~V3b c  
/** ?LJiFG]^m  
* 'BUfdb8d  
* @author g<ov` bF  
*/ ,@fx[5{  
public class CountControl{ } ,^p{J/  
 private static long lastExecuteTime=0;//上次更新时间  t>OEzUd9  
 private static long executeSep=60000;//定义更新间隔时间,单位毫秒 vL;>A]oM2  
 /** Creates a new instance of CountThread */ $=X>5B  
 public CountControl() {} 0>46ZzxUZ  
 public synchronized void executeUpdate(){ `\P1Ff@z0  
  Connection conn=null; bPif"dhHe  
  PreparedStatement ps=null; \D};0#G0&  
  try{ fq4uiFi<  
   conn = DBUtils.getConnection(); L& rtN@5;  
   conn.setAutoCommit(false); tqCwbi  
   ps=conn.prepareStatement("update t_news set hits=hits+1 where id=?"); h4=mGJpm  
   for(int i=0;i<CountCache.list.size();i++){ ,)N/2M\B-  
    CountBean cb=(CountBean)CountCache.list.getFirst(); itE/QB  
    CountCache.list.removeFirst(); &EYoviFp  
    ps.setInt(1, cb.getCountId()); >j7]gi(  
    ps.executeUpdate();⑴ P_b!^sq9  
    //ps.addBatch();⑵ w ~"%&SNN  
   } [c -|`d^  
   //int [] counts = ps.executeBatch();⑶ s(ap~UCOw  
   conn.commit(); `Kn+d~S4  
  }catch(Exception e){ 86 9sS  
   e.printStackTrace(); 7KGb2V<t  
  } finally{ ]jPP]Z:y  
  try{ =c$x xEDD  
   if(ps!=null) { "Bwmq9Jq  
    ps.clearParameters(); sxS%1hp3  
ps.close(); a#G3dY>  
ps=null; Pd& Npp3  
  } jse!EtB:  
 }catch(SQLException e){} ay| |yn:  
 DBUtils.closeConnection(conn); hrO9_B|#  
 } *>`6{0, 9  
} {; th~[  
public long getLast(){ z,hBtq:-$  
 return lastExecuteTime; %!AzFL J|Z  
} Vugb;5Vl  
public void run(){ #qUGc`  
 long now = System.currentTimeMillis(); uix/O*^  
 if ((now - lastExecuteTime) > executeSep) { Q, "8Ty  
  //System.out.print("lastExecuteTime:"+lastExecuteTime); pr1bsrMuL  
  //System.out.print(" now:"+now+"\n"); f& \ Bs8la  
  // System.out.print(" sep="+(now - lastExecuteTime)+"\n"); $pKegK;'z  
  lastExecuteTime=now; xX9snSGz  
  executeUpdate(); r&Qa;-4Pl  
 } #d<|_  
 else{ ?RIf0;G  
  //System.out.print("wait for "+(now - lastExecuteTime)+" seconds:"+"\n"); h@'CmIZc  
 } 34[TM3L].  
} 7 , _b  
} >]%$lSCW\D  
//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 )FmIL(vu  
@H3x51PT(m  
  类写好了,下面是在JSP中如下调用。 kwqY~@W  
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<% 6|{&7=1t  
CountBean cb=new CountBean(); yGSZ;BDW:K  
cb.setCountId(Integer.parseInt(request.getParameter("cid"))); Gg]Jp:GF  
CountCache.add(cb); %rgW}Z5  
out.print(CountCache.list.size()+"<br>"); =F Y2O`%a  
CountControl c=new CountControl(); fBh/$    
c.run(); Hq,@j{($  
out.print(CountCache.list.size()+"<br>"); #D%6b  
%>
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